232 lines
7.6 KiB
SQL
232 lines
7.6 KiB
SQL
-- ================================================
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-- 修复核心性能问题（UPDATE 和 SELECT 慢）
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-- ================================================
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-- 问题：
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-- 1. UPDATE sys_user WHERE user_id = ? 慢（1144ms）
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-- 2. SELECT FROM student_class WHERE student_id = ? 慢（573ms）
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-- 3. SELECT FROM sys_user (JOIN 查询) 慢（575ms）
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-- ================================================
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USE study;
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SELECT '========================================' AS '';
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SELECT '修复核心性能问题' AS '';
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SELECT '========================================' AS '';
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-- ================================================
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-- 1. 检查 sys_user 表结构和索引
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-- ================================================
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SELECT '' AS '';
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SELECT '【检查1】sys_user 表索引' AS '';
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SHOW INDEX FROM sys_user;
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-- 检查 user_id 是否是主键
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SELECT CASE
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WHEN (SELECT COUNT(*) FROM information_schema.STATISTICS
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WHERE TABLE_SCHEMA = 'study' AND TABLE_NAME = 'sys_user'
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AND INDEX_NAME = 'PRIMARY' AND COLUMN_NAME = 'user_id') > 0
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THEN '✅ user_id 是主键'
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ELSE '❌ user_id 不是主键！'
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END AS 'user_id 主键检查';
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-- 检查 user_name 索引（用于查询是否存在）
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SELECT CASE
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WHEN (SELECT COUNT(*) FROM information_schema.STATISTICS
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WHERE TABLE_SCHEMA = 'study' AND TABLE_NAME = 'sys_user'
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AND COLUMN_NAME = 'user_name') > 0
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THEN '✅ user_name 有索引'
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ELSE '❌ user_name 无索引'
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END AS 'user_name 索引检查';
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-- ================================================
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-- 2. 检查 student_class 表索引
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-- ================================================
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SELECT '' AS '';
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SELECT '【检查2】student_class 表索引' AS '';
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SHOW INDEX FROM student_class;
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-- ================================================
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-- 3. 检查表的数据量和碎片
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-- ================================================
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SELECT '' AS '';
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SELECT '【检查3】表数据量和碎片' AS '';
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SELECT
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TABLE_NAME AS '表名',
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TABLE_ROWS AS '行数',
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ROUND(DATA_LENGTH/1024/1024, 2) AS '数据大小(MB)',
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ROUND(INDEX_LENGTH/1024/1024, 2) AS '索引大小(MB)',
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ROUND(DATA_FREE/1024/1024, 2) AS '碎片大小(MB)',
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CASE
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WHEN DATA_FREE > 0 THEN '⚠️ 有碎片'
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ELSE '✅ 无碎片'
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END AS '碎片状态'
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FROM information_schema.TABLES
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WHERE TABLE_SCHEMA = 'study'
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AND TABLE_NAME IN ('sys_user', 'student_class', 'sys_user_role', 'sys_dept', 'sys_role')
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ORDER BY TABLE_ROWS DESC;
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-- ================================================
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-- 4. 优化表（清理碎片）
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-- ================================================
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SELECT '' AS '';
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SELECT '【优化1】清理表碎片...' AS '';
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OPTIMIZE TABLE sys_user;
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OPTIMIZE TABLE student_class;
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OPTIMIZE TABLE sys_user_role;
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SELECT '✅ 表优化完成' AS result;
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-- ================================================
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-- 5. 创建必要的复合索引
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-- ================================================
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SELECT '' AS '';
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SELECT '【优化2】创建复合索引...' AS '';
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-- sys_user 表：dept_id 索引（用于 JOIN）
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SELECT '正在检查 sys_user.idx_dept_id...' AS '';
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SET @sql = (SELECT IF(
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(SELECT COUNT(*) FROM information_schema.STATISTICS
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WHERE TABLE_SCHEMA = 'study' AND TABLE_NAME = 'sys_user'
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AND INDEX_NAME = 'idx_dept_id' AND COLUMN_NAME = 'dept_id') = 0,
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'ALTER TABLE sys_user ADD INDEX idx_dept_id (dept_id)',
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'SELECT "idx_dept_id 已存在，跳过" AS result'
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));
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PREPARE stmt FROM @sql;
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EXECUTE stmt;
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DEALLOCATE PREPARE stmt;
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-- sys_user 表：del_flag 索引（用于 WHERE u.del_flag = '0'）
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SELECT '正在检查 sys_user.idx_del_flag...' AS '';
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SET @sql = (SELECT IF(
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(SELECT COUNT(*) FROM information_schema.STATISTICS
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WHERE TABLE_SCHEMA = 'study' AND TABLE_NAME = 'sys_user'
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AND INDEX_NAME = 'idx_del_flag' AND COLUMN_NAME = 'del_flag') = 0,
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'ALTER TABLE sys_user ADD INDEX idx_del_flag (del_flag)',
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'SELECT "idx_del_flag 已存在，跳过" AS result'
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));
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PREPARE stmt FROM @sql;
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EXECUTE stmt;
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DEALLOCATE PREPARE stmt;
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-- sys_dept 表：dept_id 主键应该已存在，检查一下
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SELECT '正在检查 sys_dept 索引...' AS '';
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SELECT CASE
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WHEN (SELECT COUNT(*) FROM information_schema.STATISTICS
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WHERE TABLE_SCHEMA = 'study' AND TABLE_NAME = 'sys_dept'
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AND INDEX_NAME = 'PRIMARY' AND COLUMN_NAME = 'dept_id') > 0
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THEN '✅ sys_dept.dept_id 是主键'
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ELSE '⚠️ sys_dept.dept_id 不是主键'
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END AS result;
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SELECT '✅ 索引创建完成' AS result;
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-- ================================================
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-- 6. 重新分析表
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-- ================================================
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SELECT '' AS '';
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SELECT '【优化3】重新分析表...' AS '';
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ANALYZE TABLE sys_user;
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ANALYZE TABLE student_class;
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ANALYZE TABLE sys_user_role;
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ANALYZE TABLE sys_dept;
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ANALYZE TABLE sys_role;
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SELECT '✅ 表分析完成' AS result;
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-- ================================================
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-- 7. 测试查询性能
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-- ================================================
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SELECT '' AS '';
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SELECT '【测试】查询性能测试' AS '';
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-- 测试 UPDATE（实际是测试 WHERE user_id = ?）
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SET @start = NOW(6);
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SELECT * FROM sys_user WHERE user_id = 207 AND del_flag = '0';
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SET @end = NOW(6);
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SELECT
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TIMESTAMPDIFF(MICROSECOND, @start, @end)/1000 AS '用户查询耗时(ms)',
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CASE
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WHEN TIMESTAMPDIFF(MICROSECOND, @start, @end)/1000 < 50 THEN '✅ 优秀'
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WHEN TIMESTAMPDIFF(MICROSECOND, @start, @end)/1000 < 200 THEN '⚠️ 一般'
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ELSE '❌ 较差'
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END AS '性能';
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-- 测试 student_class 查询
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SET @start = NOW(6);
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SELECT * FROM student_class WHERE student_id = 207 ORDER BY join_time DESC;
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SET @end = NOW(6);
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SELECT
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TIMESTAMPDIFF(MICROSECOND, @start, @end)/1000 AS '班级查询耗时(ms)',
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CASE
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WHEN TIMESTAMPDIFF(MICROSECOND, @start, @end)/1000 < 50 THEN '✅ 优秀'
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WHEN TIMESTAMPDIFF(MICROSECOND, @start, @end)/1000 < 200 THEN '⚠️ 一般'
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ELSE '❌ 较差'
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END AS '性能';
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-- 测试复杂 JOIN 查询
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SET @start = NOW(6);
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SELECT u.user_id, u.user_name, d.dept_name, r.role_name
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FROM sys_user u
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LEFT JOIN sys_dept d ON u.dept_id = d.dept_id
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LEFT JOIN sys_user_role ur ON u.user_id = ur.user_id
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LEFT JOIN sys_role r ON r.role_id = ur.role_id
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WHERE u.user_id = 207 AND u.del_flag = '0';
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SET @end = NOW(6);
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SELECT
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TIMESTAMPDIFF(MICROSECOND, @start, @end)/1000 AS 'JOIN查询耗时(ms)',
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CASE
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WHEN TIMESTAMPDIFF(MICROSECOND, @start, @end)/1000 < 100 THEN '✅ 优秀'
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WHEN TIMESTAMPDIFF(MICROSECOND, @start, @end)/1000 < 300 THEN '⚠️ 一般'
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ELSE '❌ 较差'
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END AS '性能';
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-- ================================================
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-- 8. 检查是否有锁表或慢查询
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-- ================================================
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SELECT '' AS '';
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SELECT '【诊断】检查锁表和慢查询' AS '';
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-- 检查当前运行的查询
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SELECT
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ID AS '进程ID',
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USER AS '用户',
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HOST AS '主机',
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DB AS '数据库',
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COMMAND AS '命令',
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TIME AS '耗时(秒)',
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STATE AS '状态',
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LEFT(INFO, 50) AS 'SQL前50字符'
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FROM information_schema.PROCESSLIST
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WHERE COMMAND != 'Sleep'
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AND TIME > 1
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ORDER BY TIME DESC
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LIMIT 10;
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-- ================================================
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-- 完成
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-- ================================================
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SELECT '' AS '';
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SELECT '========================================' AS '';
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SELECT '✅ 核心性能优化完成！' AS '';
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SELECT '========================================' AS '';
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SELECT '' AS '';
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SELECT '下一步：' AS '';
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SELECT '1. 重启应用服务' AS '';
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SELECT '2. 测试导入10条数据' AS '';
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SELECT '3. 如果仍然慢（UPDATE >500ms），可能是网络问题' AS '';
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SELECT '' AS '';
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