66 lines
2.0 KiB
SQL
66 lines
2.0 KiB
SQL
-- ================================================
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-- 手动修复索引（简化版，直接执行）
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-- ================================================
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USE study;
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-- ================================================
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-- 1. 删除冗余索引（如果存在）
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-- ================================================
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-- 删除 student_class 的冗余索引
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ALTER TABLE student_class DROP INDEX IF EXISTS idx_student_id;
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SELECT '✅ student_class.idx_student_id 已删除（如果存在）' AS result;
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-- ================================================
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-- 2. 创建必要的索引（如果不存在）
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-- ================================================
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-- sys_user_role 表索引
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ALTER TABLE sys_user_role ADD INDEX IF NOT EXISTS idx_user_id (user_id);
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ALTER TABLE sys_user_role ADD INDEX IF NOT EXISTS idx_role_id (role_id);
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SELECT '✅ sys_user_role 索引已创建' AS result;
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-- sys_role 表索引
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ALTER TABLE sys_role ADD INDEX IF NOT EXISTS idx_del_flag (del_flag);
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SELECT '✅ sys_role 索引已创建' AS result;
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-- courseware 表索引
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ALTER TABLE courseware ADD INDEX IF NOT EXISTS idx_course_id (course_id);
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SELECT '✅ courseware 索引已创建' AS result;
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-- learning_detail 表索引
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ALTER TABLE learning_detail ADD INDEX IF NOT EXISTS idx_student_course (student_id, course_id);
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SELECT '✅ learning_detail 索引已创建' AS result;
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-- ================================================
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-- 3. 分析表
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-- ================================================
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ANALYZE TABLE sys_user_role;
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ANALYZE TABLE sys_role;
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ANALYZE TABLE courseware;
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ANALYZE TABLE learning_detail;
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ANALYZE TABLE student_class;
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ANALYZE TABLE sys_user;
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SELECT '✅ 所有表已分析' AS result;
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-- ================================================
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-- 4. 测试性能
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-- ================================================
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SELECT '=== 测试查询性能 ===' AS info;
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SET @start = NOW(6);
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SELECT COUNT(*) FROM sys_user_role WHERE user_id = 455;
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SET @end = NOW(6);
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SELECT TIMESTAMPDIFF(MICROSECOND, @start, @end)/1000 AS '角色查询耗时(ms)';
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SELECT '✅ 所有优化完成！' AS result;
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