운영 서버에서 DB index 적용 작업 진행

- 01~07 작업 문서를 운영 측정값 기준으로 정리 (문서의 DB 비밀번호 삭제) - app_highest_record 중복 8,795행 점수 기준 정리, 인덱스 5개 + UNIQUE 키 2개 추가 - 02·04 공통 측정 스크립트와 측정 결과, comparison.txt 추가 - 서버 처리 시간 18~292배 단축, 결과 행 수 동일 - 운영 데이터 백업과 권한(비밀번호 해시) 파일은 커밋에서 제외 Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-09-15 23:30:42 +09:00
parent ded12332d5
commit 03eea2098e
56 changed files with 6993 additions and 0 deletions
@@ -0,0 +1,33 @@
+-- best_record: 랭킹용
+ALTER TABLE best_record 
+ADD INDEX IF NOT EXISTS idx_maestro_app_dt (MaestroID, AppID, RecordDateTime),
+ALGORITHM=INPLACE, LOCK=NONE;
+
+-- best_record: 히스토리/저장용
+ALTER TABLE best_record 
+ADD INDEX IF NOT EXISTS idx_maestro_player_app_dt (MaestroID, PlayerID, AppID, RecordDateTime),
+ALGORITHM=INPLACE, LOCK=NONE;
+
+-- typing_exam_record
+ALTER TABLE typing_exam_record 
+ADD INDEX IF NOT EXISTS idx_maestro_writing_dt (MaestroID, WritingID, RecordDateTime),
+ALGORITHM=INPLACE, LOCK=NONE;
+
+ALTER TABLE typing_exam_record 
+ADD INDEX IF NOT EXISTS idx_maestro_player_writing_dt (MaestroID, PlayerID, WritingID, RecordDateTime),
+ALGORITHM=INPLACE, LOCK=NONE;
+
+-- license_score
+ALTER TABLE license_score 
+ADD INDEX IF NOT EXISTS idx_maestro_player_dt (MaestroID, PlayerID, ScoreDateTime),
+ALGORITHM=INPLACE, LOCK=NONE;
+
+-- app_highest_record: UNIQUE 키
+ALTER TABLE app_highest_record 
+ADD UNIQUE KEY IF NOT EXISTS uk_maestro_player_app (MaestroID, PlayerID, AppID),
+ALGORITHM=INPLACE, LOCK=NONE;
+
+-- typing_exam_highest_record: UNIQUE 키
+ALTER TABLE typing_exam_highest_record 
+ADD UNIQUE KEY IF NOT EXISTS uk_maestro_player_writing (MaestroID, PlayerID, WritingID),
+ALGORITHM=INPLACE, LOCK=NONE;
@@ -0,0 +1,8 @@
+TABLE_NAME	INDEX_NAME	NON_UNIQUE	cols
+app_highest_record	uk_maestro_player_app	0	MaestroID,PlayerID,AppID
+best_record	idx_maestro_app_dt	1	MaestroID,AppID,RecordDateTime
+best_record	idx_maestro_player_app_dt	1	MaestroID,PlayerID,AppID,RecordDateTime
+license_score	idx_maestro_player_dt	1	MaestroID,PlayerID,ScoreDateTime
+typing_exam_highest_record	uk_maestro_player_writing	0	MaestroID,PlayerID,WritingID
+typing_exam_record	idx_maestro_player_writing_dt	1	MaestroID,PlayerID,WritingID,RecordDateTime
+typing_exam_record	idx_maestro_writing_dt	1	MaestroID,WritingID,RecordDateTime
@@ -0,0 +1,64 @@
+--------------
+ALTER TABLE best_record 
+ADD INDEX IF NOT EXISTS idx_maestro_app_dt (MaestroID, AppID, RecordDateTime),
+ALGORITHM=INPLACE, LOCK=NONE
+--------------
+
+Query OK, 0 rows affected (4.803 sec)
+Records: 0  Duplicates: 0  Warnings: 0
+
+--------------
+ALTER TABLE best_record 
+ADD INDEX IF NOT EXISTS idx_maestro_player_app_dt (MaestroID, PlayerID, AppID, RecordDateTime),
+ALGORITHM=INPLACE, LOCK=NONE
+--------------
+
+Query OK, 0 rows affected (4.832 sec)
+Records: 0  Duplicates: 0  Warnings: 0
+
+--------------
+ALTER TABLE typing_exam_record 
+ADD INDEX IF NOT EXISTS idx_maestro_writing_dt (MaestroID, WritingID, RecordDateTime),
+ALGORITHM=INPLACE, LOCK=NONE
+--------------
+
+Query OK, 0 rows affected (0.735 sec)
+Records: 0  Duplicates: 0  Warnings: 0
+
+--------------
+ALTER TABLE typing_exam_record 
+ADD INDEX IF NOT EXISTS idx_maestro_player_writing_dt (MaestroID, PlayerID, WritingID, RecordDateTime),
+ALGORITHM=INPLACE, LOCK=NONE
+--------------
+
+Query OK, 0 rows affected (0.370 sec)
+Records: 0  Duplicates: 0  Warnings: 0
+
+--------------
+ALTER TABLE license_score 
+ADD INDEX IF NOT EXISTS idx_maestro_player_dt (MaestroID, PlayerID, ScoreDateTime),
+ALGORITHM=INPLACE, LOCK=NONE
+--------------
+
+Query OK, 0 rows affected (0.042 sec)
+Records: 0  Duplicates: 0  Warnings: 0
+
+--------------
+ALTER TABLE app_highest_record 
+ADD UNIQUE KEY IF NOT EXISTS uk_maestro_player_app (MaestroID, PlayerID, AppID),
+ALGORITHM=INPLACE, LOCK=NONE
+--------------
+
+Query OK, 0 rows affected (1.076 sec)
+Records: 0  Duplicates: 0  Warnings: 0
+
+--------------
+ALTER TABLE typing_exam_highest_record 
+ADD UNIQUE KEY IF NOT EXISTS uk_maestro_player_writing (MaestroID, PlayerID, WritingID),
+ALGORITHM=INPLACE, LOCK=NONE
+--------------
+
+Query OK, 0 rows affected (0.156 sec)
+Records: 0  Duplicates: 0  Warnings: 0
+
+Bye
@@ -0,0 +1,308 @@
+=== q1_hour_func ===
+{
+  "query_optimization": {
+    "r_total_time_ms": 0.303570412
+  },
+  "query_block": {
+    "select_id": 1,
+    "r_loops": 1,
+    "r_total_time_ms": 2.069071756,
+    "nested_loop": [
+      {
+        "read_sorted_file": {
+          "r_rows": 22,
+          "filesort": {
+            "sort_key": "best_record.RecordDateTime, best_record.PlayerID",
+            "r_loops": 1,
+            "r_total_time_ms": 2.050037968,
+            "r_used_priority_queue": false,
+            "r_output_rows": 22,
+            "r_buffer_size": "2047Kb",
+            "r_sort_mode": "sort_key,addon_fields",
+            "table": {
+              "table_name": "best_record",
+              "access_type": "ref",
+              "possible_keys": [
+                "MaestroID",
+                "AppID",
+                "idx_maestro_app_dt",
+                "idx_maestro_player_app_dt"
+              ],
+              "key": "idx_maestro_app_dt",
+              "key_length": "8",
+              "used_key_parts": ["MaestroID", "AppID"],
+              "ref": ["const", "const"],
+              "r_loops": 1,
+              "rows": 5851,
+              "r_rows": 22,
+              "r_table_time_ms": 2.024712928,
+              "r_other_time_ms": 0.015343053,
+              "r_engine_stats": {
+                "pages_accessed": 77
+              },
+              "filtered": 100,
+              "r_filtered": 100,
+              "index_condition": "cast(best_record.RecordDateTime as date) = @`day` and hour(best_record.RecordDateTime) = 9",
+              "attached_condition": "best_record.MaestroID <=> @maestro and best_record.AppID <=> @app"
+            }
+          }
+        }
+      }
+    ]
+  }
+}
+=== q2_hour_range ===
+{
+  "query_optimization": {
+    "r_total_time_ms": 0.23481673
+  },
+  "query_block": {
+    "select_id": 1,
+    "r_loops": 1,
+    "r_total_time_ms": 0.259231588,
+    "nested_loop": [
+      {
+        "read_sorted_file": {
+          "r_rows": 22,
+          "filesort": {
+            "sort_key": "best_record.RecordDateTime, best_record.PlayerID",
+            "r_loops": 1,
+            "r_total_time_ms": 0.241578075,
+            "r_used_priority_queue": false,
+            "r_output_rows": 22,
+            "r_buffer_size": "2047Kb",
+            "r_sort_mode": "sort_key,addon_fields",
+            "table": {
+              "table_name": "best_record",
+              "access_type": "range",
+              "possible_keys": [
+                "MaestroID",
+                "AppID",
+                "idx_maestro_app_dt",
+                "idx_maestro_player_app_dt"
+              ],
+              "key": "idx_maestro_app_dt",
+              "key_length": "13",
+              "used_key_parts": ["MaestroID", "AppID", "RecordDateTime"],
+              "r_loops": 1,
+              "rows": 22,
+              "r_rows": 22,
+              "r_table_time_ms": 0.143388535,
+              "r_other_time_ms": 0.086477209,
+              "r_engine_stats": {
+                "pages_accessed": 69
+              },
+              "filtered": 100,
+              "r_filtered": 100,
+              "index_condition": "best_record.MaestroID = @maestro and best_record.AppID = @app and best_record.RecordDateTime >= '2026-08-26 09:00:00' and best_record.RecordDateTime < '2026-08-26 10:00:00'"
+            }
+          }
+        }
+      }
+    ]
+  }
+}
+=== q3_day_func ===
+{
+  "query_optimization": {
+    "r_total_time_ms": 0.260151772
+  },
+  "query_block": {
+    "select_id": 1,
+    "r_loops": 1,
+    "r_total_time_ms": 2.440415655,
+    "filesort": {
+      "sort_key": "max(best_record.BestRecord) desc, best_record.PlayerID",
+      "r_loops": 1,
+      "r_total_time_ms": 0.019813943,
+      "r_used_priority_queue": false,
+      "r_output_rows": 61,
+      "r_buffer_size": "1Kb",
+      "r_sort_mode": "sort_key,rowid",
+      "temporary_table": {
+        "nested_loop": [
+          {
+            "table": {
+              "table_name": "best_record",
+              "access_type": "ref",
+              "possible_keys": [
+                "MaestroID",
+                "AppID",
+                "idx_maestro_app_dt",
+                "idx_maestro_player_app_dt"
+              ],
+              "key": "idx_maestro_app_dt",
+              "key_length": "8",
+              "used_key_parts": ["MaestroID", "AppID"],
+              "ref": ["const", "const"],
+              "r_loops": 1,
+              "rows": 5851,
+              "r_rows": 99,
+              "r_table_time_ms": 2.331223925,
+              "r_other_time_ms": 0.071694268,
+              "r_engine_stats": {
+                "pages_accessed": 308
+              },
+              "filtered": 100,
+              "r_filtered": 100,
+              "index_condition": "year(best_record.RecordDateTime) = 2026 and month(best_record.RecordDateTime) = 8 and dayofmonth(best_record.RecordDateTime) = 26",
+              "attached_condition": "best_record.MaestroID <=> @maestro and best_record.AppID <=> @app"
+            }
+          }
+        ]
+      }
+    }
+  }
+}
+=== q4_day_range ===
+{
+  "query_optimization": {
+    "r_total_time_ms": 0.335646795
+  },
+  "query_block": {
+    "select_id": 1,
+    "r_loops": 1,
+    "r_total_time_ms": 0.467062948,
+    "filesort": {
+      "sort_key": "max(best_record.BestRecord) desc, best_record.PlayerID",
+      "r_loops": 1,
+      "r_total_time_ms": 0.017993581,
+      "r_used_priority_queue": false,
+      "r_output_rows": 61,
+      "r_buffer_size": "1Kb",
+      "r_sort_mode": "sort_key,rowid",
+      "temporary_table": {
+        "nested_loop": [
+          {
+            "table": {
+              "table_name": "best_record",
+              "access_type": "range",
+              "possible_keys": [
+                "MaestroID",
+                "AppID",
+                "idx_maestro_app_dt",
+                "idx_maestro_player_app_dt"
+              ],
+              "key": "idx_maestro_app_dt",
+              "key_length": "13",
+              "used_key_parts": ["MaestroID", "AppID", "RecordDateTime"],
+              "r_loops": 1,
+              "rows": 99,
+              "r_rows": 99,
+              "r_table_time_ms": 0.318203324,
+              "r_other_time_ms": 0.112702428,
+              "r_engine_stats": {
+                "pages_accessed": 300
+              },
+              "filtered": 100,
+              "r_filtered": 100,
+              "index_condition": "best_record.MaestroID = @maestro and best_record.AppID = @app and best_record.RecordDateTime >= '2026-08-26 00:00:00' and best_record.RecordDateTime < '2026-08-27 00:00:00'"
+            }
+          }
+        ]
+      }
+    }
+  }
+}
+=== q5_month_func ===
+{
+  "query_optimization": {
+    "r_total_time_ms": 0.248649482
+  },
+  "query_block": {
+    "select_id": 1,
+    "r_loops": 1,
+    "r_total_time_ms": 4.299725667,
+    "filesort": {
+      "sort_key": "max(best_record.BestRecord) desc, best_record.PlayerID",
+      "r_loops": 1,
+      "r_total_time_ms": 0.068003533,
+      "r_used_priority_queue": false,
+      "r_output_rows": 262,
+      "r_buffer_size": "6Kb",
+      "r_sort_mode": "sort_key,rowid",
+      "temporary_table": {
+        "nested_loop": [
+          {
+            "table": {
+              "table_name": "best_record",
+              "access_type": "ref",
+              "possible_keys": [
+                "MaestroID",
+                "AppID",
+                "idx_maestro_app_dt",
+                "idx_maestro_player_app_dt"
+              ],
+              "key": "idx_maestro_app_dt",
+              "key_length": "8",
+              "used_key_parts": ["MaestroID", "AppID"],
+              "ref": ["const", "const"],
+              "r_loops": 1,
+              "rows": 5851,
+              "r_rows": 709,
+              "r_table_time_ms": 3.78789381,
+              "r_other_time_ms": 0.408851363,
+              "r_engine_stats": {
+                "pages_accessed": 2138
+              },
+              "filtered": 100,
+              "r_filtered": 100,
+              "index_condition": "year(best_record.RecordDateTime) = 2026 and month(best_record.RecordDateTime) = 8",
+              "attached_condition": "best_record.MaestroID <=> @maestro and best_record.AppID <=> @app"
+            }
+          }
+        ]
+      }
+    }
+  }
+}
+=== q6_month_range ===
+{
+  "query_optimization": {
+    "r_total_time_ms": 0.306621019
+  },
+  "query_block": {
+    "select_id": 1,
+    "r_loops": 1,
+    "r_total_time_ms": 2.496056728,
+    "filesort": {
+      "sort_key": "max(best_record.BestRecord) desc, best_record.PlayerID",
+      "r_loops": 1,
+      "r_total_time_ms": 0.065773089,
+      "r_used_priority_queue": false,
+      "r_output_rows": 262,
+      "r_buffer_size": "6Kb",
+      "r_sort_mode": "sort_key,rowid",
+      "temporary_table": {
+        "nested_loop": [
+          {
+            "table": {
+              "table_name": "best_record",
+              "access_type": "range",
+              "possible_keys": [
+                "MaestroID",
+                "AppID",
+                "idx_maestro_app_dt",
+                "idx_maestro_player_app_dt"
+              ],
+              "key": "idx_maestro_app_dt",
+              "key_length": "13",
+              "used_key_parts": ["MaestroID", "AppID", "RecordDateTime"],
+              "r_loops": 1,
+              "rows": 709,
+              "r_rows": 709,
+              "r_table_time_ms": 2.033224622,
+              "r_other_time_ms": 0.360211684,
+              "r_engine_stats": {
+                "pages_accessed": 2131
+              },
+              "filtered": 0.057728633,
+              "r_filtered": 100,
+              "index_condition": "best_record.MaestroID = @maestro and best_record.AppID = @app and best_record.RecordDateTime >= '2026-08-01 00:00:00' and best_record.RecordDateTime < '2026-09-01 00:00:00'"
+            }
+          }
+        ]
+      }
+    }
+  }
+}
@@ -0,0 +1,32 @@
+{
+  "query_block": {
+    "select_id": 1,
+    "nested_loop": [
+      {
+        "read_sorted_file": {
+          "filesort": {
+            "sort_key": "best_record.RecordDateTime, best_record.PlayerID",
+            "table": {
+              "table_name": "best_record",
+              "access_type": "ref",
+              "possible_keys": [
+                "MaestroID",
+                "AppID",
+                "idx_maestro_app_dt",
+                "idx_maestro_player_app_dt"
+              ],
+              "key": "idx_maestro_app_dt",
+              "key_length": "8",
+              "used_key_parts": ["MaestroID", "AppID"],
+              "ref": ["const", "const"],
+              "rows": 5851,
+              "filtered": 100,
+              "index_condition": "cast(best_record.RecordDateTime as date) = @`day` and hour(best_record.RecordDateTime) = 9",
+              "attached_condition": "best_record.MaestroID <=> @maestro and best_record.AppID <=> @app"
+            }
+          }
+        }
+      }
+    ]
+  }
+}
@@ -0,0 +1,30 @@
+{
+  "query_block": {
+    "select_id": 1,
+    "nested_loop": [
+      {
+        "read_sorted_file": {
+          "filesort": {
+            "sort_key": "best_record.RecordDateTime, best_record.PlayerID",
+            "table": {
+              "table_name": "best_record",
+              "access_type": "range",
+              "possible_keys": [
+                "MaestroID",
+                "AppID",
+                "idx_maestro_app_dt",
+                "idx_maestro_player_app_dt"
+              ],
+              "key": "idx_maestro_app_dt",
+              "key_length": "13",
+              "used_key_parts": ["MaestroID", "AppID", "RecordDateTime"],
+              "rows": 22,
+              "filtered": 100,
+              "index_condition": "best_record.MaestroID = @maestro and best_record.AppID = @app and best_record.RecordDateTime >= <cache>(cast(@`day` as datetime) + interval @`hour` hour) and best_record.RecordDateTime < <cache>(cast(@`day` as datetime) + interval @`hour` + 1 hour)"
+            }
+          }
+        }
+      }
+    ]
+  }
+}
@@ -0,0 +1,32 @@
+{
+  "query_block": {
+    "select_id": 1,
+    "filesort": {
+      "sort_key": "max(best_record.BestRecord) desc, best_record.PlayerID",
+      "temporary_table": {
+        "nested_loop": [
+          {
+            "table": {
+              "table_name": "best_record",
+              "access_type": "ref",
+              "possible_keys": [
+                "MaestroID",
+                "AppID",
+                "idx_maestro_app_dt",
+                "idx_maestro_player_app_dt"
+              ],
+              "key": "idx_maestro_app_dt",
+              "key_length": "8",
+              "used_key_parts": ["MaestroID", "AppID"],
+              "ref": ["const", "const"],
+              "rows": 5851,
+              "filtered": 100,
+              "index_condition": "year(best_record.RecordDateTime) = 2026 and month(best_record.RecordDateTime) = 8 and dayofmonth(best_record.RecordDateTime) = 26",
+              "attached_condition": "best_record.MaestroID <=> @maestro and best_record.AppID <=> @app"
+            }
+          }
+        ]
+      }
+    }
+  }
+}
@@ -0,0 +1,30 @@
+{
+  "query_block": {
+    "select_id": 1,
+    "filesort": {
+      "sort_key": "max(best_record.BestRecord) desc, best_record.PlayerID",
+      "temporary_table": {
+        "nested_loop": [
+          {
+            "table": {
+              "table_name": "best_record",
+              "access_type": "range",
+              "possible_keys": [
+                "MaestroID",
+                "AppID",
+                "idx_maestro_app_dt",
+                "idx_maestro_player_app_dt"
+              ],
+              "key": "idx_maestro_app_dt",
+              "key_length": "13",
+              "used_key_parts": ["MaestroID", "AppID", "RecordDateTime"],
+              "rows": 99,
+              "filtered": 100,
+              "index_condition": "best_record.MaestroID = @maestro and best_record.AppID = @app and best_record.RecordDateTime >= <cache>(cast(@`day` as datetime)) and best_record.RecordDateTime < <cache>(cast(@`day` as datetime) + interval 1 day)"
+            }
+          }
+        ]
+      }
+    }
+  }
+}
@@ -0,0 +1,32 @@
+{
+  "query_block": {
+    "select_id": 1,
+    "filesort": {
+      "sort_key": "max(best_record.BestRecord) desc, best_record.PlayerID",
+      "temporary_table": {
+        "nested_loop": [
+          {
+            "table": {
+              "table_name": "best_record",
+              "access_type": "ref",
+              "possible_keys": [
+                "MaestroID",
+                "AppID",
+                "idx_maestro_app_dt",
+                "idx_maestro_player_app_dt"
+              ],
+              "key": "idx_maestro_app_dt",
+              "key_length": "8",
+              "used_key_parts": ["MaestroID", "AppID"],
+              "ref": ["const", "const"],
+              "rows": 5851,
+              "filtered": 100,
+              "index_condition": "year(best_record.RecordDateTime) = 2026 and month(best_record.RecordDateTime) = 8",
+              "attached_condition": "best_record.MaestroID <=> @maestro and best_record.AppID <=> @app"
+            }
+          }
+        ]
+      }
+    }
+  }
+}
@@ -0,0 +1,30 @@
+{
+  "query_block": {
+    "select_id": 1,
+    "filesort": {
+      "sort_key": "max(best_record.BestRecord) desc, best_record.PlayerID",
+      "temporary_table": {
+        "nested_loop": [
+          {
+            "table": {
+              "table_name": "best_record",
+              "access_type": "range",
+              "possible_keys": [
+                "MaestroID",
+                "AppID",
+                "idx_maestro_app_dt",
+                "idx_maestro_player_app_dt"
+              ],
+              "key": "idx_maestro_app_dt",
+              "key_length": "13",
+              "used_key_parts": ["MaestroID", "AppID", "RecordDateTime"],
+              "rows": 709,
+              "filtered": 0.057728633,
+              "index_condition": "best_record.MaestroID = @maestro and best_record.AppID = @app and best_record.RecordDateTime >= <cache>(cast(date_format(@`day`,'%Y-%m-01') as datetime)) and best_record.RecordDateTime < <cache>(cast(date_format(@`day`,'%Y-%m-01') as datetime) + interval 1 month)"
+            }
+          }
+        ]
+      }
+    }
+  }
+}
@@ -0,0 +1,6 @@
+start_time	query_time	rows_examined	sql_text
+2026-09-15 23:09:13.487911	00:00:04.819872	0	ALTER TABLE best_record \nADD INDEX IF NOT EXISTS idx_maestro_player_app_dt (MaestroID, PlayerID, AppID, RecordDateTime),
+2026-09-15 23:09:08.684811	00:00:04.790929	0	ALTER TABLE best_record \nADD INDEX IF NOT EXISTS idx_maestro_app_dt (MaestroID, AppID, RecordDateTime),\nALGORITHM=INPLAC
+2026-09-15 23:09:19.466802	00:00:01.063310	0	ALTER TABLE app_highest_record \nADD UNIQUE KEY IF NOT EXISTS uk_maestro_player_app (MaestroID, PlayerID, AppID),\nALGORIT
+2026-09-15 23:08:21.126639	00:00:00.929698	935362	DELETE AHR FROM app_highest_record AHR\nJOIN (\n  SELECT AppHighestRecordID FROM (\n    SELECT AppHighestRecordID,\n        
+2026-09-15 23:09:18.319470	00:00:00.723314	0	ALTER TABLE typing_exam_record \nADD INDEX IF NOT EXISTS idx_maestro_writing_dt (MaestroID, WritingID, RecordDateTime),\nA
@@ -0,0 +1,12 @@
+baseline q1_hour_func     server_time_ms=74.61373851
+baseline q2_hour_range    server_time_ms=75.58458171
+baseline q3_day_func      server_time_ms=75.28739257
+baseline q4_day_range     server_time_ms=75.24298373
+baseline q5_month_func    server_time_ms=76.26824776
+baseline q6_month_range   server_time_ms=79.70009072
+after    q1_hour_func     server_time_ms=2.069071756
+after    q2_hour_range    server_time_ms=0.259231588
+after    q3_day_func      server_time_ms=2.440415655
+after    q4_day_range     server_time_ms=0.467062948
+after    q5_month_func    server_time_ms=4.299725667
+after    q6_month_range   server_time_ms=2.496056728
@@ -0,0 +1,356 @@
+=== q1_hour_func ===
+{
+  "query_optimization": {
+    "r_total_time_ms": 0.175154857
+  },
+  "query_block": {
+    "select_id": 1,
+    "r_loops": 1,
+    "r_total_time_ms": 74.61373851,
+    "nested_loop": [
+      {
+        "read_sorted_file": {
+          "r_rows": 22,
+          "filesort": {
+            "sort_key": "best_record.RecordDateTime, best_record.PlayerID",
+            "r_loops": 1,
+            "r_total_time_ms": 74.59065391,
+            "r_used_priority_queue": false,
+            "r_output_rows": 22,
+            "r_buffer_size": "2047Kb",
+            "r_sort_mode": "sort_key,addon_fields",
+            "table": {
+              "table_name": "best_record",
+              "access_type": "index_merge",
+              "possible_keys": ["MaestroID", "AppID"],
+              "key_length": "4,4",
+              "index_merge": {
+                "intersect": [
+                  {
+                    "range": {
+                      "key": "MaestroID",
+                      "used_key_parts": ["MaestroID"]
+                    }
+                  },
+                  {
+                    "range": {
+                      "key": "AppID",
+                      "used_key_parts": ["AppID"]
+                    }
+                  }
+                ]
+              },
+              "r_loops": 1,
+              "rows": 10103,
+              "r_rows": 5851,
+              "r_table_time_ms": 15.56706792,
+              "r_other_time_ms": 52.50187814,
+              "r_engine_stats": {
+                "pages_accessed": 17780
+              },
+              "filtered": 100,
+              "r_filtered": 0.376004102,
+              "attached_condition": "best_record.MaestroID = @maestro and best_record.AppID = @app and cast(best_record.RecordDateTime as date) = @`day` and hour(best_record.RecordDateTime) = 9"
+            }
+          }
+        }
+      }
+    ]
+  }
+}
+=== q2_hour_range ===
+{
+  "query_optimization": {
+    "r_total_time_ms": 0.183126443
+  },
+  "query_block": {
+    "select_id": 1,
+    "r_loops": 1,
+    "r_total_time_ms": 75.58458171,
+    "nested_loop": [
+      {
+        "read_sorted_file": {
+          "r_rows": 22,
+          "filesort": {
+            "sort_key": "best_record.RecordDateTime, best_record.PlayerID",
+            "r_loops": 1,
+            "r_total_time_ms": 75.56186719,
+            "r_used_priority_queue": false,
+            "r_output_rows": 22,
+            "r_buffer_size": "2047Kb",
+            "r_sort_mode": "sort_key,addon_fields",
+            "table": {
+              "table_name": "best_record",
+              "access_type": "index_merge",
+              "possible_keys": ["MaestroID", "AppID"],
+              "key_length": "4,4",
+              "index_merge": {
+                "intersect": [
+                  {
+                    "range": {
+                      "key": "MaestroID",
+                      "used_key_parts": ["MaestroID"]
+                    }
+                  },
+                  {
+                    "range": {
+                      "key": "AppID",
+                      "used_key_parts": ["AppID"]
+                    }
+                  }
+                ]
+              },
+              "r_loops": 1,
+              "rows": 10103,
+              "r_rows": 5851,
+              "r_table_time_ms": 15.67992038,
+              "r_other_time_ms": 53.82031051,
+              "r_engine_stats": {
+                "pages_accessed": 17780
+              },
+              "filtered": 100,
+              "r_filtered": 0.376004102,
+              "attached_condition": "best_record.MaestroID = @maestro and best_record.AppID = @app and best_record.RecordDateTime >= '2026-08-26 09:00:00' and best_record.RecordDateTime < '2026-08-26 10:00:00'"
+            }
+          }
+        }
+      }
+    ]
+  }
+}
+=== q3_day_func ===
+{
+  "query_optimization": {
+    "r_total_time_ms": 0.205960987
+  },
+  "query_block": {
+    "select_id": 1,
+    "r_loops": 1,
+    "r_total_time_ms": 75.28739257,
+    "filesort": {
+      "sort_key": "max(best_record.BestRecord) desc, best_record.PlayerID",
+      "r_loops": 1,
+      "r_total_time_ms": 0.028745721,
+      "r_used_priority_queue": false,
+      "r_output_rows": 61,
+      "r_buffer_size": "1Kb",
+      "r_sort_mode": "sort_key,rowid",
+      "temporary_table": {
+        "nested_loop": [
+          {
+            "table": {
+              "table_name": "best_record",
+              "access_type": "index_merge",
+              "possible_keys": ["MaestroID", "AppID"],
+              "key_length": "4,4",
+              "index_merge": {
+                "intersect": [
+                  {
+                    "range": {
+                      "key": "MaestroID",
+                      "used_key_parts": ["MaestroID"]
+                    }
+                  },
+                  {
+                    "range": {
+                      "key": "AppID",
+                      "used_key_parts": ["AppID"]
+                    }
+                  }
+                ]
+              },
+              "r_loops": 1,
+              "rows": 10103,
+              "r_rows": 5851,
+              "r_table_time_ms": 15.68132066,
+              "r_other_time_ms": 53.54159505,
+              "r_engine_stats": {
+                "pages_accessed": 17780
+              },
+              "filtered": 100,
+              "r_filtered": 1.692018458,
+              "attached_condition": "best_record.MaestroID = @maestro and best_record.AppID = @app and year(best_record.RecordDateTime) = 2026 and month(best_record.RecordDateTime) = 8 and dayofmonth(best_record.RecordDateTime) = 26"
+            }
+          }
+        ]
+      }
+    }
+  }
+}
+=== q4_day_range ===
+{
+  "query_optimization": {
+    "r_total_time_ms": 0.200909982
+  },
+  "query_block": {
+    "select_id": 1,
+    "r_loops": 1,
+    "r_total_time_ms": 75.24298373,
+    "filesort": {
+      "sort_key": "max(best_record.BestRecord) desc, best_record.PlayerID",
+      "r_loops": 1,
+      "r_total_time_ms": 0.023154608,
+      "r_used_priority_queue": false,
+      "r_output_rows": 61,
+      "r_buffer_size": "1Kb",
+      "r_sort_mode": "sort_key,rowid",
+      "temporary_table": {
+        "nested_loop": [
+          {
+            "table": {
+              "table_name": "best_record",
+              "access_type": "index_merge",
+              "possible_keys": ["MaestroID", "AppID"],
+              "key_length": "4,4",
+              "index_merge": {
+                "intersect": [
+                  {
+                    "range": {
+                      "key": "MaestroID",
+                      "used_key_parts": ["MaestroID"]
+                    }
+                  },
+                  {
+                    "range": {
+                      "key": "AppID",
+                      "used_key_parts": ["AppID"]
+                    }
+                  }
+                ]
+              },
+              "r_loops": 1,
+              "rows": 10103,
+              "r_rows": 5851,
+              "r_table_time_ms": 15.79226274,
+              "r_other_time_ms": 52.7619799,
+              "r_engine_stats": {
+                "pages_accessed": 17780
+              },
+              "filtered": 100,
+              "r_filtered": 1.692018458,
+              "attached_condition": "best_record.MaestroID = @maestro and best_record.AppID = @app and best_record.RecordDateTime >= '2026-08-26 00:00:00' and best_record.RecordDateTime < '2026-08-27 00:00:00'"
+            }
+          }
+        ]
+      }
+    }
+  }
+}
+=== q5_month_func ===
+{
+  "query_optimization": {
+    "r_total_time_ms": 0.213092406
+  },
+  "query_block": {
+    "select_id": 1,
+    "r_loops": 1,
+    "r_total_time_ms": 76.26824776,
+    "filesort": {
+      "sort_key": "max(best_record.BestRecord) desc, best_record.PlayerID",
+      "r_loops": 1,
+      "r_total_time_ms": 0.069783887,
+      "r_used_priority_queue": false,
+      "r_output_rows": 262,
+      "r_buffer_size": "6Kb",
+      "r_sort_mode": "sort_key,rowid",
+      "temporary_table": {
+        "nested_loop": [
+          {
+            "table": {
+              "table_name": "best_record",
+              "access_type": "index_merge",
+              "possible_keys": ["MaestroID", "AppID"],
+              "key_length": "4,4",
+              "index_merge": {
+                "intersect": [
+                  {
+                    "range": {
+                      "key": "MaestroID",
+                      "used_key_parts": ["MaestroID"]
+                    }
+                  },
+                  {
+                    "range": {
+                      "key": "AppID",
+                      "used_key_parts": ["AppID"]
+                    }
+                  }
+                ]
+              },
+              "r_loops": 1,
+              "rows": 10103,
+              "r_rows": 5851,
+              "r_table_time_ms": 16.3543846,
+              "r_other_time_ms": 53.27444188,
+              "r_engine_stats": {
+                "pages_accessed": 17780
+              },
+              "filtered": 100,
+              "r_filtered": 12.11758674,
+              "attached_condition": "best_record.MaestroID = @maestro and best_record.AppID = @app and year(best_record.RecordDateTime) = 2026 and month(best_record.RecordDateTime) = 8"
+            }
+          }
+        ]
+      }
+    }
+  }
+}
+=== q6_month_range ===
+{
+  "query_optimization": {
+    "r_total_time_ms": 0.215072801
+  },
+  "query_block": {
+    "select_id": 1,
+    "r_loops": 1,
+    "r_total_time_ms": 79.70009072,
+    "filesort": {
+      "sort_key": "max(best_record.BestRecord) desc, best_record.PlayerID",
+      "r_loops": 1,
+      "r_total_time_ms": 0.072174363,
+      "r_used_priority_queue": false,
+      "r_output_rows": 262,
+      "r_buffer_size": "6Kb",
+      "r_sort_mode": "sort_key,rowid",
+      "temporary_table": {
+        "nested_loop": [
+          {
+            "table": {
+              "table_name": "best_record",
+              "access_type": "index_merge",
+              "possible_keys": ["MaestroID", "AppID"],
+              "key_length": "4,4",
+              "index_merge": {
+                "intersect": [
+                  {
+                    "range": {
+                      "key": "MaestroID",
+                      "used_key_parts": ["MaestroID"]
+                    }
+                  },
+                  {
+                    "range": {
+                      "key": "AppID",
+                      "used_key_parts": ["AppID"]
+                    }
+                  }
+                ]
+              },
+              "r_loops": 1,
+              "rows": 10103,
+              "r_rows": 5851,
+              "r_table_time_ms": 19.07379578,
+              "r_other_time_ms": 54.36322855,
+              "r_engine_stats": {
+                "pages_accessed": 17780
+              },
+              "filtered": 100,
+              "r_filtered": 12.11758674,
+              "attached_condition": "best_record.MaestroID = @maestro and best_record.AppID = @app and best_record.RecordDateTime >= '2026-08-01 00:00:00' and best_record.RecordDateTime < '2026-09-01 00:00:00'"
+            }
+          }
+        ]
+      }
+    }
+  }
+}
@@ -0,0 +1,6 @@
+baseline q1_hour_func     server_time_ms=74.61373851
+baseline q2_hour_range    server_time_ms=75.58458171
+baseline q3_day_func      server_time_ms=75.28739257
+baseline q4_day_range     server_time_ms=75.24298373
+baseline q5_month_func    server_time_ms=76.26824776
+baseline q6_month_range   server_time_ms=79.70009072
@@ -0,0 +1,39 @@
+{
+  "query_block": {
+    "select_id": 1,
+    "nested_loop": [
+      {
+        "read_sorted_file": {
+          "filesort": {
+            "sort_key": "best_record.RecordDateTime, best_record.PlayerID",
+            "table": {
+              "table_name": "best_record",
+              "access_type": "index_merge",
+              "possible_keys": ["MaestroID", "AppID"],
+              "key_length": "4,4",
+              "index_merge": {
+                "intersect": [
+                  {
+                    "range": {
+                      "key": "MaestroID",
+                      "used_key_parts": ["MaestroID"]
+                    }
+                  },
+                  {
+                    "range": {
+                      "key": "AppID",
+                      "used_key_parts": ["AppID"]
+                    }
+                  }
+                ]
+              },
+              "rows": 10103,
+              "filtered": 100,
+              "attached_condition": "best_record.MaestroID = @maestro and best_record.AppID = @app and cast(best_record.RecordDateTime as date) = @`day` and hour(best_record.RecordDateTime) = 9"
+            }
+          }
+        }
+      }
+    ]
+  }
+}
@@ -0,0 +1,39 @@
+{
+  "query_block": {
+    "select_id": 1,
+    "nested_loop": [
+      {
+        "read_sorted_file": {
+          "filesort": {
+            "sort_key": "best_record.RecordDateTime, best_record.PlayerID",
+            "table": {
+              "table_name": "best_record",
+              "access_type": "index_merge",
+              "possible_keys": ["MaestroID", "AppID"],
+              "key_length": "4,4",
+              "index_merge": {
+                "intersect": [
+                  {
+                    "range": {
+                      "key": "MaestroID",
+                      "used_key_parts": ["MaestroID"]
+                    }
+                  },
+                  {
+                    "range": {
+                      "key": "AppID",
+                      "used_key_parts": ["AppID"]
+                    }
+                  }
+                ]
+              },
+              "rows": 10103,
+              "filtered": 100,
+              "attached_condition": "best_record.MaestroID = @maestro and best_record.AppID = @app and best_record.RecordDateTime >= <cache>(cast(@`day` as datetime) + interval @`hour` hour) and best_record.RecordDateTime < <cache>(cast(@`day` as datetime) + interval @`hour` + 1 hour)"
+            }
+          }
+        }
+      }
+    ]
+  }
+}
@@ -0,0 +1,39 @@
+{
+  "query_block": {
+    "select_id": 1,
+    "filesort": {
+      "sort_key": "max(best_record.BestRecord) desc, best_record.PlayerID",
+      "temporary_table": {
+        "nested_loop": [
+          {
+            "table": {
+              "table_name": "best_record",
+              "access_type": "index_merge",
+              "possible_keys": ["MaestroID", "AppID"],
+              "key_length": "4,4",
+              "index_merge": {
+                "intersect": [
+                  {
+                    "range": {
+                      "key": "MaestroID",
+                      "used_key_parts": ["MaestroID"]
+                    }
+                  },
+                  {
+                    "range": {
+                      "key": "AppID",
+                      "used_key_parts": ["AppID"]
+                    }
+                  }
+                ]
+              },
+              "rows": 10103,
+              "filtered": 100,
+              "attached_condition": "best_record.MaestroID = @maestro and best_record.AppID = @app and year(best_record.RecordDateTime) = 2026 and month(best_record.RecordDateTime) = 8 and dayofmonth(best_record.RecordDateTime) = 26"
+            }
+          }
+        ]
+      }
+    }
+  }
+}
@@ -0,0 +1,39 @@
+{
+  "query_block": {
+    "select_id": 1,
+    "filesort": {
+      "sort_key": "max(best_record.BestRecord) desc, best_record.PlayerID",
+      "temporary_table": {
+        "nested_loop": [
+          {
+            "table": {
+              "table_name": "best_record",
+              "access_type": "index_merge",
+              "possible_keys": ["MaestroID", "AppID"],
+              "key_length": "4,4",
+              "index_merge": {
+                "intersect": [
+                  {
+                    "range": {
+                      "key": "MaestroID",
+                      "used_key_parts": ["MaestroID"]
+                    }
+                  },
+                  {
+                    "range": {
+                      "key": "AppID",
+                      "used_key_parts": ["AppID"]
+                    }
+                  }
+                ]
+              },
+              "rows": 10103,
+              "filtered": 100,
+              "attached_condition": "best_record.MaestroID = @maestro and best_record.AppID = @app and best_record.RecordDateTime >= <cache>(cast(@`day` as datetime)) and best_record.RecordDateTime < <cache>(cast(@`day` as datetime) + interval 1 day)"
+            }
+          }
+        ]
+      }
+    }
+  }
+}
@@ -0,0 +1,39 @@
+{
+  "query_block": {
+    "select_id": 1,
+    "filesort": {
+      "sort_key": "max(best_record.BestRecord) desc, best_record.PlayerID",
+      "temporary_table": {
+        "nested_loop": [
+          {
+            "table": {
+              "table_name": "best_record",
+              "access_type": "index_merge",
+              "possible_keys": ["MaestroID", "AppID"],
+              "key_length": "4,4",
+              "index_merge": {
+                "intersect": [
+                  {
+                    "range": {
+                      "key": "MaestroID",
+                      "used_key_parts": ["MaestroID"]
+                    }
+                  },
+                  {
+                    "range": {
+                      "key": "AppID",
+                      "used_key_parts": ["AppID"]
+                    }
+                  }
+                ]
+              },
+              "rows": 10103,
+              "filtered": 100,
+              "attached_condition": "best_record.MaestroID = @maestro and best_record.AppID = @app and year(best_record.RecordDateTime) = 2026 and month(best_record.RecordDateTime) = 8"
+            }
+          }
+        ]
+      }
+    }
+  }
+}
@@ -0,0 +1,39 @@
+{
+  "query_block": {
+    "select_id": 1,
+    "filesort": {
+      "sort_key": "max(best_record.BestRecord) desc, best_record.PlayerID",
+      "temporary_table": {
+        "nested_loop": [
+          {
+            "table": {
+              "table_name": "best_record",
+              "access_type": "index_merge",
+              "possible_keys": ["MaestroID", "AppID"],
+              "key_length": "4,4",
+              "index_merge": {
+                "intersect": [
+                  {
+                    "range": {
+                      "key": "MaestroID",
+                      "used_key_parts": ["MaestroID"]
+                    }
+                  },
+                  {
+                    "range": {
+                      "key": "AppID",
+                      "used_key_parts": ["AppID"]
+                    }
+                  }
+                ]
+              },
+              "rows": 10103,
+              "filtered": 100,
+              "attached_condition": "best_record.MaestroID = @maestro and best_record.AppID = @app and best_record.RecordDateTime >= <cache>(cast(date_format(@`day`,'%Y-%m-01') as datetime)) and best_record.RecordDateTime < <cache>(cast(date_format(@`day`,'%Y-%m-01') as datetime) + interval 1 month)"
+            }
+          }
+        ]
+      }
+    }
+  }
+}
@@ -0,0 +1,6 @@
+baseline_explain_q1_hour_func.json       access_type=index_merge  key=MaestroID ∩ AppID            rows=10103
+baseline_explain_q2_hour_range.json      access_type=index_merge  key=MaestroID ∩ AppID            rows=10103
+baseline_explain_q3_day_func.json        access_type=index_merge  key=MaestroID ∩ AppID            rows=10103
+baseline_explain_q4_day_range.json       access_type=index_merge  key=MaestroID ∩ AppID            rows=10103
+baseline_explain_q5_month_func.json      access_type=index_merge  key=MaestroID ∩ AppID            rows=10103
+baseline_explain_q6_month_range.json     access_type=index_merge  key=MaestroID ∩ AppID            rows=10103
@@ -0,0 +1,6 @@
+day	hour	cnt
+2026-08-26	9	22
+2026-08-28	9	22
+2026-08-26	10	21
+2026-08-31	10	20
+2026-08-25	10	19
@@ -0,0 +1,39 @@
+=== 성능 개선 효과 (운영 DB, 2026-09-15) ===
+측정 기준: params.sql (MaestroID 181, AppID 21, @day 2026-08-26, @hour 9)
+측정 시점: 베이스라인 22:5x (인덱스 추가 전) / 개선 후 23:1x (인덱스 7개 추가 후)
+
+| 쿼리               | access_type (전→후)   | rows (전→후)          | 서버 시간 ms (전→후, ANALYZE) | 결과 행 수 |
+|--------------------|-----------------------|-----------------------|-------------------------------|-----------|
+| q1 시간별 · 함수   | index_merge → ref     | 10,103 → 5,851 (1.7배) | 74.61 → 2.07 (36배)           | 22 = 22   |
+| q2 시간별 · 범위   | index_merge → range   | 10,103 → 22 (459배)    | 75.58 → 0.26 (292배)          | 22 = 22   |
+| q3 일간 · 함수     | index_merge → ref     | 10,103 → 5,851 (1.7배) | 75.29 → 2.44 (31배)           | 61 = 61   |
+| q4 일간 · 범위     | index_merge → range   | 10,103 → 99 (102배)    | 75.24 → 0.47 (161배)          | 61 = 61   |
+| q5 월간 · 함수     | index_merge → ref     | 10,103 → 5,851 (1.7배) | 76.27 → 4.30 (18배)           | 262 = 262 |
+| q6 월간 · 범위     | index_merge → range   | 10,103 → 709 (14배)    | 79.70 → 2.50 (32배)           | 262 = 262 |
+
+사용 인덱스: 개선 후 6개 모두 idx_maestro_app_dt (MaestroID, AppID, RecordDateTime)
+클라이언트 시간 (네트워크 포함, 2회차): 약 88~92ms → 13~18ms
+
+참고 (스테이징): rows 5,804 → 1, cost 8.63 → 0.004
+참고 (운영 01 사전 측정): 일간 랭킹 index_merge, rows 10,100
+
+결과 행 수 동일 (4-3): [x] 예  [ ] 아니오
+
+결론:
+- 인덱스만의 효과 (q1·q3·q5, 함수형 조건):
+  rows 추정은 1.7배만 줄었지만 서버 처리 시간은 18~36배 단축.
+  기존에는 MaestroID·AppID 단일 인덱스 두 개의 교집합(index_merge)을 구하느라 느렸고,
+  복합 인덱스의 (MaestroID, AppID) 앞부분으로 바로 찾게(ref) 되었기 때문.
+  날짜 조건은 여전히 인덱스로 거르지 못해 해당 선생님·앱의 기록 약 5,851행을 확인함.
+- 인덱스 + 쿼리 수정 효과 (q2·q4·q6, 범위 조건):
+  날짜까지 인덱스로 걸러(range) 조회 기간의 실제 기록만 읽음.
+  서버 처리 시간 32~292배 단축, 검사 행 수 14~459배 감소.
+  같은 조건에서 함수형 대비 추가로 1.7~9배 빠름 (q1→q2 8배, q3→q4 5배, q5→q6 1.7배).
+
+중복 정리 (03-0):
+- app_highest_record 8,795행 삭제 (4,823조합), 220,648행 = 220,648조합
+- UNIQUE 키 2개 추가 완료 → 이후 중복 저장은 DB가 거부
+
+Slow query log (04-5, 23:08 이후 1시간):
+- 0.5초 이상은 작업 SQL 5건(ALTER 4건, 중복 DELETE 1건)뿐, 애플리케이션 쿼리 0건
+- 새벽이 아닌 밤 시간이고 기간이 짧으므로 24시간 뒤 다시 확인 필요 (07단계)
@@ -0,0 +1,2 @@
+dup_groups	rows_to_delete
+4823	8795
@@ -0,0 +1,47 @@
+--------------
+DELETE AHR FROM app_highest_record AHR
+JOIN (
+  SELECT AppHighestRecordID FROM (
+    SELECT AppHighestRecordID,
+           ROW_NUMBER() OVER (
+             PARTITION BY MaestroID, PlayerID, AppID
+             ORDER BY CASE WHEN AppID = 105 THEN HighestRecord ELSE -HighestRecord END,
+                      AppHighestRecordID DESC
+           ) AS rn
+    FROM app_highest_record
+  ) ranked
+  WHERE rn > 1
+) dup ON dup.AppHighestRecordID = AHR.AppHighestRecordID
+--------------
+
+Query OK, 8795 rows affected (0.942 sec)
+
+--------------
+SELECT 'app_highest_record' AS table_name,
+       COUNT(*) AS total_rows,
+       COUNT(DISTINCT MaestroID, PlayerID, AppID) AS unique_combos
+FROM app_highest_record
+--------------
+
+--------------------+------------+---------------+
+| table_name         | total_rows | unique_combos |
+--------------------+------------+---------------+
+| app_highest_record |     220648 |        220648 |
+--------------------+------------+---------------+
+1 row in set (0.190 sec)
+
+--------------
+SELECT 'typing_exam_highest_record' AS table_name,
+       COUNT(*) AS total_rows,
+       COUNT(DISTINCT MaestroID, PlayerID, WritingID) AS unique_combos
+FROM typing_exam_highest_record
+--------------
+
+----------------------------+------------+---------------+
+| table_name                 | total_rows | unique_combos |
+----------------------------+------------+---------------+
+| typing_exam_highest_record |      20413 |         20413 |
+----------------------------+------------+---------------+
+1 row in set (0.024 sec)
+
+Bye
@@ -0,0 +1,12 @@
+baseline_explain_q1_hour_func.json       access_type=index_merge  key=MaestroID ∩ AppID            rows=10103
+baseline_explain_q2_hour_range.json      access_type=index_merge  key=MaestroID ∩ AppID            rows=10103
+baseline_explain_q3_day_func.json        access_type=index_merge  key=MaestroID ∩ AppID            rows=10103
+baseline_explain_q4_day_range.json       access_type=index_merge  key=MaestroID ∩ AppID            rows=10103
+baseline_explain_q5_month_func.json      access_type=index_merge  key=MaestroID ∩ AppID            rows=10103
+baseline_explain_q6_month_range.json     access_type=index_merge  key=MaestroID ∩ AppID            rows=10103
+after_explain_q1_hour_func.json          access_type=ref          key=idx_maestro_app_dt           rows=5851
+after_explain_q2_hour_range.json         access_type=range        key=idx_maestro_app_dt           rows=22
+after_explain_q3_day_func.json           access_type=ref          key=idx_maestro_app_dt           rows=5851
+after_explain_q4_day_range.json          access_type=range        key=idx_maestro_app_dt           rows=99
+after_explain_q5_month_func.json         access_type=ref          key=idx_maestro_app_dt           rows=5851
+after_explain_q6_month_range.json        access_type=range        key=idx_maestro_app_dt           rows=709
@@ -0,0 +1 @@
+SET @maestro = 181, @app = 21, @day = '2026-08-26', @hour = 9;
@@ -0,0 +1,2 @@
+dup_groups	rows_to_delete
+4823	8795
@@ -0,0 +1,11 @@
+MaestroID	PlayerID	AppID	cnt
+223	115830	2	33
+306	93738	106	25
+123	86825	106	21
+82	2245	106	21
+278	84908	106	20
+49	114356	106	20
+184	112221	101	19
+127	71176	3	19
+363	105234	106	18
+75	10923	106	17
@@ -0,0 +1,66 @@
+{
+  "query_block": {
+    "select_id": 1,
+    "filesort": {
+      "sort_key": "max(BR.BestRecord) desc",
+      "temporary_table": {
+        "nested_loop": [
+          {
+            "table": {
+              "table_name": "BR",
+              "access_type": "index_merge",
+              "possible_keys": [
+                "MaestroID",
+                "AppID",
+                "PlayerID"
+              ],
+              "key_length": "4,4",
+              "index_merge": {
+                "intersect": [
+                  {
+                    "range": {
+                      "key": "MaestroID",
+                      "used_key_parts": [
+                        "MaestroID"
+                      ]
+                    }
+                  },
+                  {
+                    "range": {
+                      "key": "AppID",
+                      "used_key_parts": [
+                        "AppID"
+                      ]
+                    }
+                  }
+                ]
+              },
+              "rows": 10100,
+              "filtered": 100,
+              "attached_condition": "BR.MaestroID = 181 and BR.AppID = 21 and year(BR.RecordDateTime) = 2026 and month(BR.RecordDateTime) = 9 and dayofmonth(BR.RecordDateTime) = 15"
+            }
+          },
+          {
+            "table": {
+              "table_name": "U",
+              "access_type": "eq_ref",
+              "possible_keys": [
+                "PRIMARY"
+              ],
+              "key": "PRIMARY",
+              "key_length": "4",
+              "used_key_parts": [
+                "PlayerID"
+              ],
+              "ref": [
+                "chocomae.BR.PlayerID"
+              ],
+              "rows": 1,
+              "filtered": 100
+            }
+          }
+        ]
+      }
+    }
+  }
+}
@@ -0,0 +1,55 @@
+ym	cnt
+2022-04	3
+2022-05	3544
+2022-06	7730
+2022-07	7543
+2022-08	4605
+2022-09	4164
+2022-10	4702
+2022-11	4052
+2022-12	2446
+2023-01	3903
+2023-02	1580
+2023-03	18646
+2023-04	22750
+2023-05	19749
+2023-06	18620
+2023-07	16490
+2023-08	13244
+2023-09	17892
+2023-10	19045
+2023-11	23144
+2023-12	17608
+2024-01	15262
+2024-02	6745
+2024-03	19414
+2024-04	27242
+2024-05	25057
+2024-06	21613
+2024-07	23446
+2024-08	17951
+2024-09	21469
+2024-10	22776
+2024-11	22526
+2024-12	19082
+2025-01	12170
+2025-02	8558
+2025-03	26788
+2025-04	30366
+2025-05	29850
+2025-06	32421
+2025-07	28872
+2025-08	19853
+2025-09	33908
+2025-10	22878
+2025-11	28723
+2025-12	28649
+2026-01	16532
+2026-02	8980
+2026-03	66105
+2026-04	70072
+2026-05	58444
+2026-06	65606
+2026-07	56307
+2026-08	51991
+2026-09	39366
@@ -0,0 +1,6 @@
+Variable_name	Value
+log_output	FILE
+log_queries_not_using_indexes	OFF
+long_query_time	3.000000
+slow_query_log	ON
+slow_query_log_file	/var/log/mysql/mariadb-slow.log
@@ -0,0 +1,67 @@
+=== 운영 DB 사전 측정 결과 (2026-09-15) ===
+
+1. 테이블 크기 (premeasure_table_sizes.txt)
+   - best_record data_mb: 72.5
+   - best_record index_mb: 72.1
+   - best_record 행 수: 약 1,152,399 (information_schema 추정치) / 월별 합계 1,210,482
+   - typing_exam_record data_mb: 10.3
+   - typing_exam_record index_mb: 10.9
+
+2. 월별 적재량 (premeasure_monthly_load.txt)
+   - 최근 1개월 (2026-08): 51,991 행
+   - 2026-09 (15일까지): 39,366 행
+   - 최근 3개월 평균 (2026-06~08): 57,968 행/월
+   - 전년 같은 기간 평균 (2025-06~08): 27,049 행/월 → 약 2.1배 증가
+
+3. 테스트용 선생님·앱 (premeasure_top_maestro_app.txt)
+   - MaestroID: 181
+   - AppID: 21
+   - 30일 기록 수: 1,089
+
+4. 일간 랭킹 EXPLAIN (premeasure_explain_daily_ranking.json)
+   - access_type: index_merge (예상했던 ALL 아님)
+   - key: MaestroID ∩ AppID (기존 단일 인덱스 2개의 교집합)
+   - rows: 10,100 (예상했던 1,206,768 아님)
+   - 날짜 조건(YEAR/MONTH/DAYOFMONTH)은 인덱스로 거르지 못하고 10,100행을 하나씩 확인
+   - 참고: 원본 출력은 헤더와 \n 이스케이프 때문에 JSON이 아니었음 → 내용 변경 없이 JSON으로 복원
+
+5. 최고기록 테이블 중복 (premeasure_*_duplicates.txt, premeasure_app_highest_dup_count.txt)
+   - app_highest_record 중복: 4,823 조합 / 삭제 대상 8,795 행
+     · 테이블 약 229,459행(추정치)의 약 3.8%
+     · 상위 10개 조합은 각 17~33행
+     · 03-0-1에서 작업 당일 다시 세어 비교 (그 사이 조금 늘어날 수 있음)
+   - typing_exam_highest_record 중복: 0 건 (빈 파일 = 조회 결과 없음)
+
+6. 계정 권한 (premeasure_grants.txt)
+   - jisangs@182.217.174.221: SELECT, ALTER ON chocomae.* 만 있음
+   - 2026-09-15 임시 부여 후 (premeasure_grants_after.txt):
+     + SUPER ON *.*
+     + INSERT, DELETE ON chocomae.app_highest_record, chocomae.typing_exam_highest_record
+     + SELECT ON mysql.slow_log
+     → 05단계에서 회수 (slow log 복원 후)
+   - 원래 권한으로 할 수 없던 작업:
+     · 02-1 slow query log 변경 (SET GLOBAL → SUPER)
+     · 03-0-3 중복 삭제 (DELETE)
+     · 04-5, 07 mysql.slow_log 조회 (SELECT ON mysql.slow_log)
+     · 05 slow query log 복원 (SET GLOBAL)
+     · 06 삭제 행 복원 (INSERT) → 임시 부여됨
+     · 06 ANALYZE TABLE best_record (best_record INSERT 필요, 부여 안 함) → 관리자 계정
+
+7. Slow query log 원래 설정 (premeasure_slow_log_settings.txt) — 05단계 복원 기준값
+   - slow_query_log: ON
+   - long_query_time: 3
+   - log_output: FILE
+   - log_queries_not_using_indexes: OFF
+   - slow_query_log_file: /var/log/mysql/mariadb-slow.log
+   - 이전 문서의 1-4 SET GLOBAL은 적용되지 않았음 (SUPER 권한 없음, 적용됐다면 long_query_time=1·log_output=TABLE)
+
+8. 준비 확인
+   ☑ 테이블 크기 확인
+   ☑ 월별 적재량 확인
+   ☑ EXPLAIN 결과 저장
+   ☑ 중복 확인 (전체 개수 포함)
+   ☑ 계정 권한 확인
+   ☑ Slow query log 현재 설정 저장
+   ☑ 작업 권한 임시 부여
+
+다음: 02-baseline.md
@@ -0,0 +1,20 @@
+TABLE_NAME	approx_rows	data_mb	index_mb
+best_record	1152399	72.5	72.1
+app_highest_record	229459	16.5	15.8
+typing_exam_record	131675	10.3	10.9
+player	22394	3.5	0.4
+active_app	17661	1.5	0.6
+typing_exam_highest_record	21355	1.4	1.2
+maestro_log	1944	0.4	0.0
+maestro	418	0.1	0.0
+license_score	514	0.1	0.0
+license_maestro_password	1024	0.1	0.0
+maestro_extension	450	0.0	0.0
+admin	0	0.0	0.0
+app	48	0.0	0.0
+ads_client	0	0.0	0.0
+license_time	0	0.0	0.0
+writing	20	0.0	0.0
+typing_exam_ads	0	0.0	0.0
+banned_word	22	0.0	0.0
+maestro_upgrade	109	0.0	0.0
@@ -0,0 +1,6 @@
+MaestroID	AppID	cnt
+181	21	1089
+181	1	591
+389	103	562
+230	21	546
+389	104	541
@@ -0,0 +1,6 @@
+SELECT SQL_NO_CACHE PlayerID, BestRecord, RecordDateTime
+FROM best_record
+WHERE MaestroID = @maestro AND AppID = @app
+  AND DATE(RecordDateTime) = @day
+  AND HOUR(RecordDateTime) = @hour
+ORDER BY RecordDateTime, PlayerID;
@@ -0,0 +1,6 @@
+SELECT SQL_NO_CACHE PlayerID, BestRecord, RecordDateTime
+FROM best_record
+WHERE MaestroID = @maestro AND AppID = @app
+  AND RecordDateTime >= CAST(@day AS DATETIME) + INTERVAL @hour HOUR
+  AND RecordDateTime <  CAST(@day AS DATETIME) + INTERVAL (@hour + 1) HOUR
+ORDER BY RecordDateTime, PlayerID;
@@ -0,0 +1,8 @@
+SELECT SQL_NO_CACHE PlayerID, MAX(BestRecord) AS HighScore
+FROM best_record
+WHERE MaestroID = @maestro AND AppID = @app
+  AND YEAR(RecordDateTime) = YEAR(@day)
+  AND MONTH(RecordDateTime) = MONTH(@day)
+  AND DAYOFMONTH(RecordDateTime) = DAYOFMONTH(@day)
+GROUP BY PlayerID
+ORDER BY HighScore DESC, PlayerID;
@@ -0,0 +1,7 @@
+SELECT SQL_NO_CACHE PlayerID, MAX(BestRecord) AS HighScore
+FROM best_record
+WHERE MaestroID = @maestro AND AppID = @app
+  AND RecordDateTime >= CAST(@day AS DATETIME)
+  AND RecordDateTime <  CAST(@day AS DATETIME) + INTERVAL 1 DAY
+GROUP BY PlayerID
+ORDER BY HighScore DESC, PlayerID;
@@ -0,0 +1,7 @@
+SELECT SQL_NO_CACHE PlayerID, MAX(BestRecord) AS HighScore
+FROM best_record
+WHERE MaestroID = @maestro AND AppID = @app
+  AND YEAR(RecordDateTime) = YEAR(@day)
+  AND MONTH(RecordDateTime) = MONTH(@day)
+GROUP BY PlayerID
+ORDER BY HighScore DESC, PlayerID;
@@ -0,0 +1,7 @@
+SELECT SQL_NO_CACHE PlayerID, MAX(BestRecord) AS HighScore
+FROM best_record
+WHERE MaestroID = @maestro AND AppID = @app
+  AND RecordDateTime >= CAST(DATE_FORMAT(@day, '%Y-%m-01') AS DATETIME)
+  AND RecordDateTime <  CAST(DATE_FORMAT(@day, '%Y-%m-01') AS DATETIME) + INTERVAL 1 MONTH
+GROUP BY PlayerID
+ORDER BY HighScore DESC, PlayerID;
@@ -0,0 +1,41 @@
+#!/bin/zsh
+# 02·04단계 공통 측정 스크립트
+# 사용법: zsh run_measure.sh baseline   (02단계, 인덱스 추가 전)
+#         zsh run_measure.sh after      (04단계, 인덱스 추가 후)
+
+PREFIX=$1
+if [[ $PREFIX != baseline && $PREFIX != after ]]; then
+  echo "사용법: zsh run_measure.sh baseline|after" >&2; exit 1
+fi
+cd "${0:A:h}" || exit 1
+
+printf "Enter password: "; read -rs DBPW; echo
+
+db() {
+  mariadb --defaults-extra-file=<(printf '[client]\npassword="%s"\n' "$DBPW") \
+    -h chocomae.jinaju.com -u jisangs chocomae "$@"
+}
+
+# 1) EXPLAIN: 쿼리마다 JSON 파일 1개
+for q in queries/*.sql; do
+  out="${PREFIX}_explain_${q:t:r}.json"
+  { cat params.sql; printf 'EXPLAIN FORMAT=JSON '; cat "$q"; } | db -N -r > "$out" \
+    || { echo "EXPLAIN 실패: $q" >&2; exit 1; }
+  echo "저장: $out"
+done
+
+# 2) 실행 시간: 같은 쿼리 묶음을 2회 실행 (2회차 값 사용)
+for round in 1 2; do
+  { cat params.sql
+    for q in queries/*.sql; do
+      echo "SELECT '=== round ${round}: ${q:t:r} ===' AS msg;"
+      cat "$q"
+    done
+  } | db -vvv || { echo "실행 시간 측정 실패" >&2; exit 1; }
+done > "${PREFIX}_perf.txt"
+echo "저장: ${PREFIX}_perf.txt"
+
+# 3) 요약: 쿼리 이름 / 결과 행 수 / 실행 시간 (2회차)
+echo
+grep -E '^\| === |rows? in set|Empty set' "${PREFIX}_perf.txt" | paste - - - | grep 'round 2' \
+  | sed -E 's/\| === round 2: (.*) === \|/\1/; s/\t1 row in set \([0-9.]+ sec\)//'
@@ -0,0 +1,18 @@
+# 사용법: python3 summarize_analyze.py baseline [after]
+import json
+import sys
+
+decoder = json.JSONDecoder()
+for prefix in sys.argv[1:]:
+    text = open(f"{prefix}_analyze.txt", encoding="utf-8").read()
+    names = [line.split("=== ")[1].split(" ===")[0] for line in text.splitlines() if line.startswith("=== ")]
+    docs, pos = [], 0
+    while True:
+        start = text.find("{", pos)
+        if start < 0:
+            break
+        doc, pos = decoder.raw_decode(text, start)
+        docs.append(doc)
+    for name, doc in zip(names, docs):
+        block = doc["query_block"]
+        print(f"{prefix:8} {name:16} server_time_ms={block.get('r_total_time_ms')}")
@@ -0,0 +1,40 @@
+# 사용법: python3 summarize_explain.py baseline [after]
+import glob
+import json
+import sys
+
+
+def find_table(node):
+    if isinstance(node, dict):
+        if isinstance(node.get("table"), dict):
+            return node["table"]
+        children = node.values()
+    elif isinstance(node, list):
+        children = node
+    else:
+        return None
+    for child in children:
+        found = find_table(child)
+        if found:
+            return found
+    return None
+
+
+def keys_of(node):
+    if isinstance(node, dict):
+        for k, v in node.items():
+            if k == "key":
+                yield v
+            else:
+                yield from keys_of(v)
+    elif isinstance(node, list):
+        for v in node:
+            yield from keys_of(v)
+
+
+for prefix in sys.argv[1:]:
+    for path in sorted(glob.glob(f"{prefix}_explain_*.json")):
+        with open(path, encoding="utf-8") as f:
+            table = find_table(json.load(f))
+        key = table.get("key") or " ∩ ".join(keys_of(table.get("index_merge", {}))) or "-"
+        print(f"{path:40} access_type={str(table.get('access_type')):12} key={key:28} rows={table.get('rows')}")
				`@@ -0,0 +1 @@`
				`SET @maestro = 181, @app = 21, @day = '2026-08-26', @hour = 9;`