v1.1.0: Alpine 轻量级 Docker 开发环境 + 敏感凭证清理

dev-envs/flux/docs/MySQL慢查询分析.md

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+# MySQL 慢查询分析
+
+---
+
+## 查看慢查询配置
+
+```sql
+SHOW VARIABLES LIKE 'slow_query%';
+SHOW VARIABLES LIKE 'long_query_time';
+```
+
+---
+
+## 查询慢日志（RDS/MySQL）
+
+```sql
+-- 最近24小时慢查询
+SELECT
+    db,
+    LEFT(REPLACE(REPLACE(sql_text, '\n', ' '), '  ', ' '), 200) as sql_preview,
+    query_time,
+    rows_examined,
+    rows_sent,
+    start_time
+FROM mysql.slow_log
+WHERE start_time > DATE_SUB(NOW(), INTERVAL 24 HOUR)
+ORDER BY query_time DESC
+LIMIT 30;
+
+-- 查询所有慢记录
+SELECT * FROM mysql.slow_log ORDER BY start_time DESC LIMIT 20;
+```
+
+---
+
+## 查看当前运行的长查询
+
+```sql
+-- 查看所有查询
+SHOW FULL PROCESSLIST;
+
+-- 筛选长查询（超过10秒）
+SELECT
+    id, User, Host, db, Time, State,
+    LEFT(Info, 150) as sql_preview
+FROM information_schema.processlist
+WHERE Command = 'Query' AND Time > 10
+ORDER BY Time DESC;
+```
+
+---
+
+## 终止查询
+
+```sql
+-- 单个终止
+KILL <process_id>;
+
+-- 批量生成终止语句（按来源IP）
+SELECT CONCAT('KILL ', id, ';')
+FROM information_schema.processlist
+WHERE Host LIKE '39.99.243.191%' AND Command = 'Query';
+```
+
+---
+
+## performance_schema 分析
+
+```sql
+-- 按总耗时排序
+SELECT
+    SCHEMA_NAME,
+    LEFT(DIGEST_TEXT, 150) as sql_pattern,
+    COUNT_STAR as exec_count,
+    ROUND(SUM_TIMER_WAIT/1000000000000, 2) as total_sec,
+    ROUND(AVG_TIMER_WAIT/1000000000, 2) as avg_ms,
+    ROUND(MAX_TIMER_WAIT/1000000000000, 2) as max_sec
+FROM performance_schema.events_statements_summary_by_digest
+WHERE SCHEMA_NAME IS NOT NULL
+ORDER BY SUM_TIMER_WAIT DESC
+LIMIT 20;
+
+-- 按平均耗时排序
+SELECT
+    SCHEMA_NAME,
+    LEFT(DIGEST_TEXT, 150) as sql_pattern,
+    COUNT_STAR as exec_count,
+    ROUND(AVG_TIMER_WAIT/1000000000, 2) as avg_ms,
+    ROUND(MAX_TIMER_WAIT/1000000000000, 2) as max_sec
+FROM performance_schema.events_statements_summary_by_digest
+WHERE SCHEMA_NAME IS NOT NULL
+ORDER BY AVG_TIMER_WAIT DESC
+LIMIT 15;
+```
+
+---
+
+## 查看表大小
+
+```sql
+SELECT
+    table_schema,
+    table_name,
+    ROUND(data_length/1024/1024, 2) as data_MB,
+    ROUND(index_length/1024/1024, 2) as index_MB,
+    table_rows
+FROM information_schema.tables
+WHERE table_schema IN ('db1', 'db2')
+ORDER BY data_length DESC
+LIMIT 30;
+```
+
+---
+
+## 常用连接
+
+| 库 | 连接命令 |
+|----|----------|
+| suke 生产库（阿里云RDS） | `mysql -hrm-8vbrd2wil14hclop3vm.mysql.zhangbei.rds.aliyuncs.com -uroot -pWFFGwffg233` |
+| 二号机 | `mysql -h47.92.117.13 -uroot -px251119!` |
+
+---
+
+*创建时间：2026-03-04*