MySQL 慢查询日报（线上 prod8591）2026-10-27

统计概览

Top10 明细（按单条耗时）

高频慢查询模式（指纹聚合，取样 23,291 条）

按条数 Top5

按累计耗时 Top5

备份模式全天 677 条 / 13.32h，未触发深度分析（如条数环比异常翻倍再人工介入）。

触发深度分析的模式（条数>100 或 累计>30min，非备份，最多 8 个）

1. SELECT c.* FROM t8_user_id_card_number_list AS c WHERE c.img_type = ? AND c.status = ? AND c.image != ? AND (c.ocr_result = ? or c.ocr_result is null) ORDER BY —— 4,342 次 × 3.56s = 4.30h

• 代表性 SQL：

SELECT c.* FROM t8_user_id_card_number_list AS c WHERE c.img_type = 2 AND c.status = 2 AND c.image != '' AND (c.ocr_result = '' or c.ocr_result is null) ORDER BY c.id ASC,`c`.`id` LIMIT 1;

• 库表：a8591.t8_user_id_card_number_list；实例 alias：prod-8591/8591-a
• explain SQL：

SELECT c.* FROM `a8591`.`t8_user_id_card_number_list` AS c WHERE c.img_type = 2 AND c.status = 2 AND c.image != '' AND (c.ocr_result = '' or c.ocr_result is null) ORDER BY c.id ASC,`c`.`id` LIMIT 1;

• 执行计划（EXPLAIN 表节点，按 JOIN 顺序）：

• 慢因：扫描行数远大于返回行数(829,032/0)、全索引扫描(c: key=PRIMARY, rows=1，缺更优过滤索引)
• 建议：补索引（按 WHERE 等值列在前、范围列收尾建复合索引）; 用 EXPLAIN 验证 key 命中; 扩复合索引: 把其余 WHERE 等值列追加到现有索引尾部, 避免 10 万+ 行回表
• 可执行 DDL（建议先在低峰期 EXPLAIN 验证再执行）：

ALTER TABLE `a8591`.`t8_user_id_card_number_list` ADD INDEX `idx_img_type_status_ocr_result` (`img_type`, `status`, `ocr_result`);

2. SELECT * FROM t8_mall_stat ORDER BY created_at DESC; —— 2 次 × 5071.51s = 2.82h

• 代表性 SQL：

SELECT *
FROM t8_mall_stat
ORDER BY created_at DESC;

• 库表：a8591.t8_mall_stat；实例 alias：prod-8591/8591-a
• explain SQL：

SELECT *
FROM `a8591`.`t8_mall_stat`
ORDER BY created_at DESC;

• 执行计划（EXPLAIN 表节点，按 JOIN 顺序）：

• 计划标志：⚠️ filesort 排序
• 慢因：EXPLAIN 全表扫描/未用索引、排序未走索引(filesort)、大结果集传输 SELECT * (Bytes_sent=2,802,043,206)
• 建议：补索引（按 WHERE 等值列在前、范围列收尾建复合索引）; 用 EXPLAIN 验证 key 命中; 把 ORDER BY 列纳入复合索引, 或减小排序前扫描范围; 改分页/按需列, 避免 SELECT * 整表捞取; 大导出走离线通道
• 可执行 DDL（建议先在低峰期 EXPLAIN 验证再执行）：

ALTER TABLE `a8591`.`t8_mall_stat` ADD INDEX `idx_created_at` (`created_at`);

3. select wallet, sum(if(type = ?, amount, ?)) - sum(if(type = ?, amount, ?)) as balance from a8591.t8_money_trade_log where account = ? and created_at <= ? group —— 138 次 × 60.08s = 2.30h

• 代表性 SQL：

select wallet, sum(if(type = 2, amount, 0)) - sum(if(type = 1, amount, 0)) as balance from `a8591`.`t8_money_trade_log` where `account` = 'A0200' and `created_at` <= '2026-10-27 00:36:26' group by `wallet`;

• 库表：a8591.t8_money_trade_log；实例 alias：prod-8591/8591-a
• explain SQL：

select wallet, sum(if(type = 2, amount, 0)) - sum(if(type = 1, amount, 0)) as balance from `a8591`.`t8_money_trade_log` where `account` = 'A0200' and `created_at` <= '2026-10-27 00:36:26' group by `wallet`;

• 执行计划（EXPLAIN 表节点，按 JOIN 顺序）：

• 慢因：扫描行数远大于返回行数(21,515,550/2)、索引范围扫描量过大(t8_money_trade_log: key=idx_aw, rows=33,833,974)
• 建议：补索引（按 WHERE 等值列在前、范围列收尾建复合索引）; 用 EXPLAIN 验证 key 命中
• 可执行 DDL（建议先在低峰期 EXPLAIN 验证再执行）：

ALTER TABLE `a8591`.`t8_money_trade_log` ADD INDEX `idx_account_created_at` (`account`, `created_at`);

• DDL 注：t8_money_trade_log 与现有索引 idx_aw(account, wallet) 前缀重复(account), 新索引生效后可评估删除旧索引

4. SELECT a.user_id AS buyerId, IFNULL(c.sellUser,IFNULL(d.sellUser,NULL)) AS sellerId, a.order_number AS orderNo, IFNULL(c.id,IFNULL(d.id,NULL)) AS txNo, a.order_ —— 1 次 × 5242.73s = 1.46h

• 代表性 SQL：

SELECT
	a.user_id AS buyerId,
	IFNULL(c.sellUser,IFNULL(d.sellUser,NULL)) AS sellerId,
	a.order_number AS orderNo,
	IFNULL(c.id,IFNULL(d.id,NULL)) AS txNo,
	a.order_status AS orderStatus,
	IFNULL(c.status,IFNULL(d.status,NULL)) AS txStatus,
  IFNULL(e.type,IFNULL(f.type,NULL)) AS gameType,
  CONVERT(CAST(IFNULL(e.name,IFNULL(f.name,NULL)) AS BINARY) USING utf8) AS gameName,
  CONVERT(CAST(IFNULL(g.type_name,IFNULL(h.type_name,NULL)) AS BINARY) USING utf8) AS goodsType,
  CONVERT(CAST(IFNULL(c.title,IFNULL(d.title,NULL)) AS BINARY) USING utf8) AS goodsTitle,
	a.pay_by AS payMethod,
	a.user_agent AS orderClient,
	IFNULL(c.price,IFNULL(d.price,NULL)) AS price,
	a.voucher_money AS couponAmount,
	i.active_id AS activityName,
	i.coupon_id AS couponId,
	IF(IFNULL(j.set_type,IFNULL(k.set_type,NULL)) = 'specifyBuyer','yes','no') AS IF_special,
	IF(a.order_createtime NOT LIKE '0000-00-00 00:00:00', a.order_createtime, NULL) AS createTime,
	IF(a.order_paytime NOT LIKE '0000-00-00 00:00:00', a.order_paytime, NULL) AS payTime,
	FROM_UNIXTIME( IFNULL(IF(c.actionTime=0,NULL,c.actionTime),IFNULL(IF(d.actionTime=0,NULL,d.actionTime),NULL)), '%Y-%m-%d %H:%i:%s' ) AS actionTime,
	IF(a.order_canceltime NOT LIKE '0000-00-00 00:00:00', a.order_canceltime, NULL) AS cancelTime
FROM
	t8_ware_order a
	LEFT JOIN t8_ware_order_item b ON a.id = b.order_id
	LEFT JOIN ware_item c ON b.ware_id = c.id
	LEFT JOIN ware_item_history d ON b.ware_id = d.id
	LEFT JOIN gameList e ON c.gameName = e.id
	LEFT JOIN gameList f ON d.gameName = f.id
	LEFT JOIN t8_ware_type g ON c.wareType = g.id
	LEFT JOIN t8_ware_type h ON d.wareType = h.id
	LEFT JOIN t8_user_voucher i ON a.voucher_id = i.id
	LEFT JOIN ( SELECT * FROM ware_set WHERE set_type = 'specifyBuyer' ) j ON c.id = j.ware_id
	LEFT JOIN ( SELECT * FROM ware_set WHERE set_type = 'specifyBuyer' ) k ON d.id = k.ware_id
WHERE 
	a.order_createtime >= '2026-01-01' AND a.order_createtime < '2027-01-01'
ORDER BY 
	a.order_createtime DESC;

• 库表：a8591.t8_ware_order；实例 alias：prod-8591/8591-a
• explain SQL：

SELECT * FROM `a8591`.`t8_ware_order` WHERE order_createtime >= '2026-01-01' LIMIT 10

• 执行计划（EXPLAIN 表节点，按 JOIN 顺序）：

• 慢因：扫描行数远大于返回行数(38,630,760/3,372,523)、索引范围扫描量过大(t8_ware_order: key=order_createtime, rows=6,420,452)
• 建议：补索引（按 WHERE 等值列在前、范围列收尾建复合索引）; 用 EXPLAIN 验证 key 命中

5. select * from a8591.t8_money_trade where (out_account = ? and out_wallet = ? and tag = ? and sub_tag = ?) and (created_at between ? and ? or checked_at = ?) and —— 175 次 × 28.19s = 1.37h

• 代表性 SQL：

select * from `a8591`.`t8_money_trade` where (`out_account` = 'A0303' and `out_wallet` = 1 and `tag` = 14 and `sub_tag` = 6) and (`created_at` between '2026-10-20 00:00:00' and '2026-10-20 23:59:59' or `checked_at` = '2026-10-20') and `created_at` >= '2022-09-19' and `checked_at` >= '2022-09-19' and left(created_at, 10) != checked_at order by `id` asc limit 500;

• 库表：a8591.t8_money_trade；实例 alias：prod-8591/8591-a
• explain SQL：

select * from `a8591`.`t8_money_trade` where (`out_account` = 'A0303' and `out_wallet` = 1 and `tag` = 14 and `sub_tag` = 6) and (`created_at` between '2026-10-20 00:00:00' and '2026-10-20 23:59:59' or `checked_at` = '2026-10-20') and `created_at` >= '2022-09-19' and `checked_at` >= '2022-09-19' and left(created_at, 10) != checked_at order by `id` asc limit 500;

• 执行计划（EXPLAIN 表节点，按 JOIN 顺序）：

• 计划标志：⚠️ filesort 排序
• 慢因：扫描行数远大于返回行数(1,554,387/0)、索引选择性差(t8_money_trade: key=intersect(idx_tag,out_aw) 扫 160,771 行回表后仅剩 0.0%，建议把其余 WHERE 等值列并入复合索引)、排序未走索引(filesort)
• 建议：补索引（按 WHERE 等值列在前、范围列收尾建复合索引）; 用 EXPLAIN 验证 key 命中; 扩复合索引: 把其余 WHERE 等值列追加到现有索引尾部, 避免 10 万+ 行回表; 把 ORDER BY 列纳入复合索引, 或减小排序前扫描范围
• 可执行 DDL（建议先在低峰期 EXPLAIN 验证再执行）：

ALTER TABLE `a8591`.`t8_money_trade` ADD INDEX `idx_out_accoun_out_wallet_tag_sub_tag_created_at_id` (`out_account`, `out_wallet`, `tag`, `sub_tag`, `created_at`, `id`);

• DDL 注：t8_money_trade 与现有索引 out_aw(out_account, out_wallet) 前缀重复(out_account), 新索引生效后可评估删除旧索引

6. SELECT a.buyUser AS buyerId, a.sellUser AS sellerId, c.order_number AS orderNo, a.id AS txNo, c.order_status AS orderStatus, a.status AS txStatus, d.type AS gam —— 1 次 × 4495.98s = 1.25h

• 代表性 SQL：

SELECT
	a.buyUser AS buyerId,
	a.sellUser AS sellerId,
	c.order_number AS orderNo,
	a.id AS txNo,
	c.order_status AS orderStatus,
	a.status AS txStatus,
	d.type AS gameType,
	CONVERT ( CAST( d.NAME AS BINARY ) USING utf8 ) AS gameName,
	CONVERT ( CAST( e.type_name AS BINARY ) USING utf8 ) AS goodsType,
	CONVERT ( CAST( a.title AS BINARY ) USING utf8 ) AS goodsTitle,
	c.pay_by AS payMethod,
	c.user_agent AS orderClient,
	a.price AS price,
	f.money AS couponAmount,
	f.active_id AS activityName,
	f.coupon_id AS couponId,
	IF ( g.set_type = 'specifyBuyer', 'yes', 'no' ) AS IF_special,
	IF ( c.order_createtime != '0000-00-00 00:00:00', c.order_createtime, NULL ) AS createTime,
	IF ( c.order_paytime != '0000-00-00 00:00:00', c.order_paytime, NULL ) AS payTime,
	FROM_UNIXTIME( IF ( a.actionTime = 0, NULL, a.actionTime ), '%Y-%m-%d %H:%i:%s' ) AS actionTime,
	IF ( c.order_canceltime != '0000-00-00 00:00:00', c.order_canceltime, NULL ) AS cancelTime
FROM
	ware_item a
	LEFT JOIN t8_ware_order_item b ON a.id = b.ware_id 
	LEFT JOIN t8_ware_order c ON b.order_id = c.id
	LEFT JOIN gameList d ON a.gameName = d.id
	LEFT JOIN t8_ware_type e ON a.wareType = e.id
	LEFT JOIN t8_user_voucher f ON b.ware_id = f.id
	LEFT JOIN ( SELECT * FROM ware_set WHERE set_type = 'specifyBuyer' ) g ON a.id = g.ware_id
WHERE
	a.postTime >= 1546272000 
	AND c.order_number IS NULL
ORDER BY 
	actionTime DESC;

• 库表：a8591.ware_item；实例 alias：prod-8591/8591-a
• explain SQL：

SELECT
	a.buyUser AS buyerId,
	a.sellUser AS sellerId,
	c.order_number AS orderNo,
	a.id AS txNo,
	c.order_status AS orderStatus,
	a.status AS txStatus,
	d.type AS gameType,
	CONVERT ( CAST( d.NAME AS BINARY ) USING utf8 ) AS gameName,
	CONVERT ( CAST( e.type_name AS BINARY ) USING utf8 ) AS goodsType,
	CONVERT ( CAST( a.title AS BINARY ) USING utf8 ) AS goodsTitle,
	c.pay_by AS payMethod,
	c.user_agent AS orderClient,
	a.price AS price,
	f.money AS couponAmount,
	f.active_id AS activityName,
	f.coupon_id AS couponId,
	IF ( g.set_type = 'specifyBuyer', 'yes', 'no' ) AS IF_special,
	IF ( c.order_createtime != '0000-00-00 00:00:00', c.order_createtime, NULL ) AS createTime,
	IF ( c.order_paytime != '0000-00-00 00:00:00', c.order_paytime, NULL ) AS payTime,
	FROM_UNIXTIME( IF ( a.actionTime = 0, NULL, a.actionTime ), '%Y-%m-%d %H:%i:%s' ) AS actionTime,
	IF ( c.order_canceltime != '0000-00-00 00:00:00', c.order_canceltime, NULL ) AS cancelTime
FROM
	`a8591`.`ware_item` a
	LEFT JOIN `a8591`.`t8_ware_order_item` b ON a.id = b.ware_id 
	LEFT JOIN `a8591`.`t8_ware_order` c ON b.order_id = c.id
	LEFT JOIN `a8591`.`gameList` d ON a.gameName = d.id
	LEFT JOIN `a8591`.`t8_ware_type` e ON a.wareType = e.id
	LEFT JOIN `a8591`.`t8_user_voucher` f ON b.ware_id = f.id
	LEFT JOIN ( SELECT * FROM `a8591`.`ware_set` WHERE set_type = 'specifyBuyer' ) g ON a.id = g.ware_id
WHERE
	a.postTime >= 1546272000 
	AND c.order_number IS NULL
ORDER BY 
	actionTime DESC;

• 执行计划（EXPLAIN 表节点，按 JOIN 顺序）：

• 计划标志：⚠️ filesort 排序
• 慢因：EXPLAIN 全表扫描/未用索引、排序未走索引(filesort)
• 建议：补索引（按 WHERE 等值列在前、范围列收尾建复合索引）; 用 EXPLAIN 验证 key 命中; 把 ORDER BY 列纳入复合索引, 或减小排序前扫描范围
• 可执行 DDL（建议先在低峰期 EXPLAIN 验证再执行）：

ALTER TABLE `a8591`.`ware_item` ADD INDEX `idx_gameName_wareType_set_type_postTime_actionTime` (`gameName`, `wareType`, `set_type`, `postTime`, `actionTime`);
ALTER TABLE `a8591`.`t8_ware_order_item` ADD INDEX `idx_ware_id_order_id` (`ware_id`, `order_id`);

• DDL 注：ware_item 与现有索引 gnat(gamename, actiontime) 前缀重复(gamename), 新索引生效后可评估删除旧索引
• DDL 注：t8_ware_order_item 与现有索引 ware_id(ware_id) 前缀重复(ware_id), 新索引生效后可评估删除旧索引

7. SELECT a.buyUser AS buyerId, a.sellUser AS sellerId, c.order_number AS orderNo, a.id AS txNo, c.order_status AS orderStatus, a.status AS txStatus, d.type AS gam —— 1 次 × 4282.27s = 1.19h

• 代表性 SQL：

SELECT
	a.buyUser AS buyerId,
	a.sellUser AS sellerId,
	c.order_number AS orderNo,
	a.id AS txNo,
	c.order_status AS orderStatus,
	a.status AS txStatus,
	d.type AS gameType,
	CONVERT ( CAST( d.NAME AS BINARY ) USING utf8 ) AS gameName,
	CONVERT ( CAST( e.type_name AS BINARY ) USING utf8 ) AS goodsType,
	CONVERT ( CAST( a.title AS BINARY ) USING utf8 ) AS goodsTitle,
	c.pay_by AS payMethod,
	c.user_agent AS orderClient,
	a.price AS price,
	f.money AS couponAmount,
	f.active_id AS activityName,
	f.coupon_id AS couponId,
	IF ( g.set_type = 'specifyBuyer', 'yes', 'no' ) AS IF_special,
	IF ( c.order_createtime != '0000-00-00 00:00:00', c.order_createtime, NULL ) AS createTime,
	IF ( c.order_paytime != '0000-00-00 00:00:00', c.order_paytime, NULL ) AS payTime,
	FROM_UNIXTIME( IF ( a.actionTime = 0, NULL, a.actionTime ), '%Y-%m-%d %H:%i:%s' ) AS actionTime,
	IF ( c.order_canceltime != '0000-00-00 00:00:00', c.order_canceltime, NULL ) AS cancelTime
FROM
	ware_item_history a
	LEFT JOIN t8_ware_order_item b ON a.id = b.ware_id 
	LEFT JOIN t8_ware_order c ON b.order_id = c.id
	LEFT JOIN gameList d ON a.gameName = d.id
	LEFT JOIN t8_ware_type e ON a.wareType = e.id
	LEFT JOIN t8_user_voucher f ON b.ware_id = f.id
	LEFT JOIN ( SELECT * FROM ware_set WHERE set_type = 'specifyBuyer' ) g ON a.id = g.ware_id
WHERE
	a.postTime >= 1546272000 
	AND c.order_number IS NULL;

• 库表：a8591.ware_item_history；实例 alias：prod-8591/8591-a
• explain SQL：

SELECT
	a.buyUser AS buyerId,
	a.sellUser AS sellerId,
	c.order_number AS orderNo,
	a.id AS txNo,
	c.order_status AS orderStatus,
	a.status AS txStatus,
	d.type AS gameType,
	CONVERT ( CAST( d.NAME AS BINARY ) USING utf8 ) AS gameName,
	CONVERT ( CAST( e.type_name AS BINARY ) USING utf8 ) AS goodsType,
	CONVERT ( CAST( a.title AS BINARY ) USING utf8 ) AS goodsTitle,
	c.pay_by AS payMethod,
	c.user_agent AS orderClient,
	a.price AS price,
	f.money AS couponAmount,
	f.active_id AS activityName,
	f.coupon_id AS couponId,
	IF ( g.set_type = 'specifyBuyer', 'yes', 'no' ) AS IF_special,
	IF ( c.order_createtime != '0000-00-00 00:00:00', c.order_createtime, NULL ) AS createTime,
	IF ( c.order_paytime != '0000-00-00 00:00:00', c.order_paytime, NULL ) AS payTime,
	FROM_UNIXTIME( IF ( a.actionTime = 0, NULL, a.actionTime ), '%Y-%m-%d %H:%i:%s' ) AS actionTime,
	IF ( c.order_canceltime != '0000-00-00 00:00:00', c.order_canceltime, NULL ) AS cancelTime
FROM
	`a8591`.`ware_item_history` a
	LEFT JOIN `a8591`.`t8_ware_order_item` b ON a.id = b.ware_id 
	LEFT JOIN `a8591`.`t8_ware_order` c ON b.order_id = c.id
	LEFT JOIN `a8591`.`gameList` d ON a.gameName = d.id
	LEFT JOIN `a8591`.`t8_ware_type` e ON a.wareType = e.id
	LEFT JOIN `a8591`.`t8_user_voucher` f ON b.ware_id = f.id
	LEFT JOIN ( SELECT * FROM `a8591`.`ware_set` WHERE set_type = 'specifyBuyer' ) g ON a.id = g.ware_id
WHERE
	a.postTime >= 1546272000 
	AND c.order_number IS NULL;

• 执行计划（EXPLAIN 表节点，按 JOIN 顺序）：

• 慢因：扫描行数远大于返回行数(32,017,828/107)、EXPLAIN 全表扫描/未用索引
• 建议：补索引（按 WHERE 等值列在前、范围列收尾建复合索引）; 用 EXPLAIN 验证 key 命中
• 可执行 DDL（建议先在低峰期 EXPLAIN 验证再执行）：

ALTER TABLE `a8591`.`ware_item_history` ADD INDEX `idx_gameName_wareType_set_type_postTime` (`gameName`, `wareType`, `set_type`, `postTime`);
ALTER TABLE `a8591`.`t8_ware_order_item` ADD INDEX `idx_ware_id_order_id` (`ware_id`, `order_id`);

• DDL 注：t8_ware_order_item 与现有索引 ware_id(ware_id) 前缀重复(ware_id), 新索引生效后可评估删除旧索引

8. select t1_design_img.id, t1_design_img.views, t1_design_img.collection, t1_design_img.favor_count, t1_design_img.comment_count, t1_design_img.pin_share_count + —— 2,702 次 × 1.38s = 1.04h

• 代表性 SQL：

select `t1_design_img`.`id`, `t1_design_img`.`views`, `t1_design_img`.`collection`, `t1_design_img`.`favor_count`, `t1_design_img`.`comment_count`, t1_design_img.pin_share_count + t1_design_img.fb_share_count + t1_design_img.line_share_count as share_count, t1_design_img.downs + t1_design_img.save_count + t1_design_img.screenshot_count as download_count from `t1_design_img` inner join `t1_design_work` on `t1_design_img`.`w_id` = `t1_design_work`.`id` where `t1_design_work`.`check_status` = 1 and `t1_design_work`.`is_show` = 1 and `t1_design_work`.`is_hide` = 0 and `t1_design_work`.`publish_time` <= '2026-10-27 00:04:56' and `t1_design_img`.`id` > 9206 order by `t1_design_img`.`id` asc limit 100;

• 库表：t591.t1_design_img；实例 alias：prod-8591/100
• explain SQL：

select `t1_design_img`.`id`, `t1_design_img`.`views`, `t1_design_img`.`collection`, `t1_design_img`.`favor_count`, `t1_design_img`.`comment_count`, t1_design_img.pin_share_count + t1_design_img.fb_share_count + t1_design_img.line_share_count as share_count, t1_design_img.downs + t1_design_img.save_count + t1_design_img.screenshot_count as download_count from `t591`.`t1_design_img` inner join `t591`.`t1_design_work` on `t1_design_img`.`w_id` = `t1_design_work`.`id` where `t1_design_work`.`check_status` = 1 and `t1_design_work`.`is_show` = 1 and `t1_design_work`.`is_hide` = 0 and `t1_design_work`.`publish_time` <= '2026-10-27 00:04:56' and `t1_design_img`.`id` > 9206 order by `t1_design_img`.`id` asc limit 100;

• 执行计划（EXPLAIN 表节点，按 JOIN 顺序）：

• 计划标志：⚠️ filesort 排序、⚠️ 产生临时表
• 慢因：扫描行数远大于返回行数(598,258/100)、DISTINCT/GROUP BY 产生临时表(大范围去重/聚合)、排序未走索引(filesort)
• 建议：补索引（按 WHERE 等值列在前、范围列收尾建复合索引）; 用 EXPLAIN 验证 key 命中; 缩小聚合/去重范围(补时间等过滤条件), 或预聚合到中间表/定时任务; 把 ORDER BY 列纳入复合索引, 或减小排序前扫描范围
• 可执行 DDL（建议先在低峰期 EXPLAIN 验证再执行）：

ALTER TABLE `t591`.`t1_design_img` ADD INDEX `idx_w_id_id` (`w_id`, `id`);
ALTER TABLE `t591`.`t1_design_work` ADD INDEX `idx_check_stat_is_show_is_hide_publish_ti` (`check_status`, `is_show`, `is_hide`, `publish_time`);

• DDL 注：t1_design_img 与现有索引 w_id(w_id) 前缀重复(w_id), 新索引生效后可评估删除旧索引
• DDL 注：t1_design_work 与现有索引 check_status(check_status, is_hide, is_show, publish_time) 前缀重复(check_status), 新索引生效后可评估删除旧索引

逐条优化建议汇总

P 行 = 深析模式（指纹聚合，按全天累计耗时降序 P1 最大，是优化主战场）；T 行 = 单条耗时 Top3 的一次性慢 SQL（多为 bi/导出查询，治理手段通常是限流/降频/移到从库，而非建索引）。

*采集脚本 .agents/scripts/mysql_slow_prod_report.py，中间数据 outputs/slow_report_prod8591_20261027.json；全程只读。*