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-- 假期留宿状态过滤功能 - 数据库索引优化脚本
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--
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-- 目的：优化假期留宿管理表的查询性能，特别是状态过滤功能
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-- 创建时间：2025-01-28
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-- 适用表：xg_holiday_stay
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-- =============================================================================
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-- 1. 基础索引：结束日期字段索引
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-- =============================================================================
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-- 检查是否已存在索引
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SELECT
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INDEX_NAME,
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COLUMN_NAME,
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NON_UNIQUE
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FROM
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INFORMATION_SCHEMA.STATISTICS
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WHERE
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TABLE_SCHEMA = DATABASE()
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AND TABLE_NAME = 'xg_holiday_stay'
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AND COLUMN_NAME = 'apply_end_date';
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-- 创建结束日期索引（如果不存在）
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-- 这个索引对状态过滤查询非常重要
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SET @sql = '
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CREATE INDEX idx_xg_holiday_stay_apply_end_date
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ON xg_holiday_stay(apply_end_date)
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COMMENT ''假期留宿结束日期索引，用于状态过滤查询优化''';
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-- 检查索引是否存在，不存在则创建
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SET @index_exists = (
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SELECT COUNT(*)
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FROM INFORMATION_SCHEMA.STATISTICS
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WHERE TABLE_SCHEMA = DATABASE()
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AND TABLE_NAME = 'xg_holiday_stay'
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AND INDEX_NAME = 'idx_xg_holiday_stay_apply_end_date'
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);
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SET @sql = IF(@index_exists = 0, @sql, 'SELECT ''索引 idx_xg_holiday_stay_apply_end_date 已存在'' AS message');
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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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-- =============================================================================
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-- 2. 复合索引：状态查询优化
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-- =============================================================================
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-- 创建状态查询复合索引
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-- 包含：租户ID + 删除标志 + 结束日期
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-- 这个索引能显著提升多租户环境下的状态过滤查询性能
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SET @sql = '
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CREATE INDEX idx_xg_holiday_stay_status_query
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ON xg_holiday_stay(tenant_id, deleted, apply_end_date)
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COMMENT ''假期留宿状态查询复合索引，优化多租户环境下的过滤查询''';
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-- 检查索引是否存在
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SET @index_exists = (
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SELECT COUNT(*)
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FROM INFORMATION_SCHEMA.STATISTICS
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WHERE TABLE_SCHEMA = DATABASE()
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AND TABLE_NAME = 'xg_holiday_stay'
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AND INDEX_NAME = 'idx_xg_holiday_stay_status_query'
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);
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SET @sql = IF(@index_exists = 0, @sql, 'SELECT ''索引 idx_xg_holiday_stay_status_query 已存在'' AS message');
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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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-- =============================================================================
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-- 3. 学生查询优化索引
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-- =============================================================================
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-- 创建学生相关查询的复合索引
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-- 包含：学生姓名 + 结束日期，便于按学生筛选时的状态过滤
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SET @sql = '
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CREATE INDEX idx_xg_holiday_stay_student_status
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ON xg_holiday_stay(student_name, apply_end_date)
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COMMENT ''假期留宿学生状态查询索引，优化按学生筛选的状态过滤''';
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-- 检查索引是否存在
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SET @index_exists = (
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SELECT COUNT(*)
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FROM INFORMATION_SCHEMA.STATISTICS
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WHERE TABLE_SCHEMA = DATABASE()
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AND TABLE_NAME = 'xg_holiday_stay'
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AND INDEX_NAME = 'idx_xg_holiday_stay_student_status'
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);
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SET @sql = IF(@index_exists = 0, @sql, 'SELECT ''索引 idx_xg_holiday_stay_student_status 已存在'' AS message');
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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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-- =============================================================================
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-- 4. 时间范围查询优化索引
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-- =============================================================================
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-- 创建时间范围查询的复合索引
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-- 包含：开始日期 + 结束日期，便于时间范围查询
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SET @sql = '
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CREATE INDEX idx_xg_holiday_stay_date_range
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ON xg_holiday_stay(apply_start_date, apply_end_date)
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COMMENT ''假期留宿时间范围查询索引，优化日期范围筛选''';
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-- 检查索引是否存在
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SET @index_exists = (
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SELECT COUNT(*)
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FROM INFORMATION_SCHEMA.STATISTICS
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WHERE TABLE_SCHEMA = DATABASE()
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AND TABLE_NAME = 'xg_holiday_stay'
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AND INDEX_NAME = 'idx_xg_holiday_stay_date_range'
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);
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SET @sql = IF(@index_exists = 0, @sql, 'SELECT ''索引 idx_xg_holiday_stay_date_range 已存在'' AS message');
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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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-- =============================================================================
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-- 5. 索引使用情况分析
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-- =============================================================================
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-- 查看表的所有索引
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SELECT
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INDEX_NAME AS '索引名称',
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GROUP_CONCAT(COLUMN_NAME ORDER BY SEQ_IN_INDEX) AS '索引字段',
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INDEX_TYPE AS '索引类型',
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NON_UNIQUE AS '是否唯一',
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INDEX_COMMENT AS '索引注释'
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FROM
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INFORMATION_SCHEMA.STATISTICS
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WHERE
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TABLE_SCHEMA = DATABASE()
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AND TABLE_NAME = 'xg_holiday_stay'
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GROUP BY
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INDEX_NAME, INDEX_TYPE, NON_UNIQUE, INDEX_COMMENT
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ORDER BY
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INDEX_NAME;
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-- =============================================================================
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-- 6. 查询性能测试示例
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-- =============================================================================
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-- 设置查询性能测试变量
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SET @current_time = NOW();
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SET @test_tenant_id = 1; -- 替换为实际的租户ID
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-- 测试1：有效状态查询
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EXPLAIN
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SELECT
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id, student_name, apply_end_date, tenant_id
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FROM
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xg_holiday_stay
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WHERE
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tenant_id = @test_tenant_id
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AND deleted = 0
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AND apply_end_date >= @current_time
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AND apply_end_date IS NOT NULL
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LIMIT 10;
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-- 测试2：失效状态查询
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EXPLAIN
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SELECT
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id, student_name, apply_end_date, tenant_id
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FROM
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xg_holiday_stay
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WHERE
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tenant_id = @test_tenant_id
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AND deleted = 0
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AND (apply_end_date < @current_time OR apply_end_date IS NULL)
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LIMIT 10;
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-- 测试3：按学生名称 + 状态查询
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EXPLAIN
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SELECT
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id, student_name, apply_end_date, tenant_id
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FROM
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xg_holiday_stay
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WHERE
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student_name LIKE '%张%'
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AND apply_end_date >= @current_time
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AND apply_end_date IS NOT NULL
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LIMIT 10;
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-- =============================================================================
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-- 7. 索引维护建议
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-- =============================================================================
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/*
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索引维护建议：
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1. 监控索引使用情况
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- 定期检查索引的使用频率
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- 删除未使用的索引以减少存储开销
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2. 索引大小监控
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- 监控索引占用的存储空间
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- 当数据量增长时，考虑索引的分区策略
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3. 查询性能监控
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- 定期分析慢查询日志
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- 使用EXPLAIN分析查询执行计划
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4. 数据更新频率考量
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- apply_end_date字段更新不频繁，适合建立索引
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- 如果业务场景中该字段更新频繁，需要权衡索引维护成本
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5. 定期重建索引（可选）
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- 对于频繁更新的表，可以定期重建索引以优化性能
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- 命令：ALTER TABLE xg_holiday_stay ENGINE=InnoDB;
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*/
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-- =============================================================================
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-- 8. 清理脚本（如需删除索引）
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-- =============================================================================
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/*
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-- 如果需要删除创建的索引，可以使用以下命令：
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DROP INDEX idx_xg_holiday_stay_apply_end_date ON xg_holiday_stay;
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DROP INDEX idx_xg_holiday_stay_status_query ON xg_holiday_stay;
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DROP INDEX idx_xg_holiday_stay_student_status ON xg_holiday_stay;
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DROP INDEX idx_xg_holiday_stay_date_range ON xg_holiday_stay;
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*/
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-- =============================================================================
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-- 执行完成提示
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-- =============================================================================
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SELECT
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'✅ 假期留宿状态过滤索引优化脚本执行完成' AS message,
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NOW() AS execution_time,
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'请查看上述输出确认索引创建情况' AS note;
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