nodejsmysql优化查询

我正在nodejs v8.9.4中使用mysql2模块。 这是我的函数，用于从满足以下条件的消息队列中获取消息：

状态==0 如果状态==1的botId计数小于10 如果在botId+chatId的等待表中重试\u，且仅botId小于NOWtimestamp 如果没有状态==1的相同chatId

目前，我删除了2个where，查询时间恢复正常

q.botId NOT IN (select ...)
q.chatId NOT IN (select ...)

所以这两个where查询是阻塞点，需要修复。

不在选择中。。。很难优化

或者无法优化

在ORDER BY中，混合DESC和ASC在8.0之前不使用索引。考虑将ASC更改为DEC。此后，索引优先级、ID可能会有所帮助。

什么是${filterActiveMessageIds}

中不需要GROUP BY

 NOT IN ( SELECT  q3.chatId
            from  bot_message_queue q3
            where  q3.status=1
            group by  q3.chatId )

按此顺序排列的INDEXstatus、chatid将有利于该子查询

索引状态，按此顺序排列

有关创建索引的详细信息：

在这种情况下，我将用NOT EXISTS替换NOT IN子查询，因为它可以执行得更好。 将订单切换为所有描述或所有ASC 因此，要优化查询，首先，添加以下索引：

ALTER TABLE `bot_message_queue` ADD INDEX `bot_message_queue_idx_status_botid_chatid_priori_id` (`status`,`botId`,`chatId`,`priority`,`id`);
ALTER TABLE `bot_message_queue` ADD INDEX `bot_message_queue_idx_priority_id` (`priority`,`id`);
ALTER TABLE `bot_message_queue` ADD INDEX `bot_message_queue_idx_botid_status` (`botId`,`status`);
ALTER TABLE `bot_message_queue` ADD INDEX `bot_message_queue_idx_chatid_status` (`chatId`,`status`);
ALTER TABLE `bot_message_queue_wait` ADD INDEX `bot_message_queue_wa_idx_chatid_botid` (`chatId`,`botId`);

现在，您可以尝试运行此查询。请注意，我已将order by更改为all DESC，因此如果需要，您可以将其更改为ASC：

SELECT
        bot_message_queue.* 
    FROM
        bot_message_queue q 
    LEFT JOIN
        bot_message_queue_wait w 
            ON q.botId = w.botId 
            AND q.chatId = w.chatId 
    LEFT JOIN
        bot_message_queue_wait w2 
            ON q.botId = w2.botId 
            AND w2.chatId = 0 
    WHERE
        q.status = 0 
        AND NOT EXISTS (
            SELECT
                1 
            FROM
                bot_message_queue AS q21 
            WHERE
                q21.status = 1 
                AND q.botId = q21.botId 
            GROUP BY
                q21.botId 
            HAVING
                COUNT(q21.botId) > ? 
            ORDER BY
                NULL
        ) 
        AND NOT EXISTS (
            SELECT
                1 
            FROM
                bot_message_queue AS q32 
            WHERE
                q32.status = 1 
                AND q.chatId = q32.chatId 
            GROUP BY
                q32.chatId 
            ORDER BY
                NULL
        ) 
        AND (
            w.retry_after IS NULL 
            OR w.retry_after <= ?
        ) 
        AND (
            w2.retry_after IS NULL 
            OR w2.retry_after <= ?
        ) 
    ORDER BY
        q.priority DESC,
        q.id DESC LIMIT 1

---

如果这个DDL有一些测试数据，帮助会容易得多。@JitendraSoftgrid不能使用内部联接，因为不是T1中的所有行在T2中都有匹配的行，内部联接将忽略这些行，但这不是我想要的want@Exlord，很抱歉，我一眼就没注意到这些情况。我修改了索引和查询建议。请再试一次并提供反馈。我首先需要最旧的条目，这样q.id DESC就不起作用了。它必须是ASC。Ans NOT EXIST子查询对我也不起作用，因为子查询是根据返回值筛选主查询的，它不可能是简单的true/false@Exlord，请随意将其更改为ASC。关于notexists部分，这个替代方法相当于原始查询中的notin语句，因为我在子查询中添加了相关的条件。那为什么不行呢？查询不返回相同的结果吗？

q.botId NOT IN (select ...)
q.chatId NOT IN (select ...)

 NOT IN ( SELECT  q3.chatId
            from  bot_message_queue q3
            where  q3.status=1
            group by  q3.chatId )

ALTER TABLE `bot_message_queue` ADD INDEX `bot_message_queue_idx_status_botid_chatid_priori_id` (`status`,`botId`,`chatId`,`priority`,`id`);
ALTER TABLE `bot_message_queue` ADD INDEX `bot_message_queue_idx_priority_id` (`priority`,`id`);
ALTER TABLE `bot_message_queue` ADD INDEX `bot_message_queue_idx_botid_status` (`botId`,`status`);
ALTER TABLE `bot_message_queue` ADD INDEX `bot_message_queue_idx_chatid_status` (`chatId`,`status`);
ALTER TABLE `bot_message_queue_wait` ADD INDEX `bot_message_queue_wa_idx_chatid_botid` (`chatId`,`botId`);

SELECT
        bot_message_queue.* 
    FROM
        bot_message_queue q 
    LEFT JOIN
        bot_message_queue_wait w 
            ON q.botId = w.botId 
            AND q.chatId = w.chatId 
    LEFT JOIN
        bot_message_queue_wait w2 
            ON q.botId = w2.botId 
            AND w2.chatId = 0 
    WHERE
        q.status = 0 
        AND NOT EXISTS (
            SELECT
                1 
            FROM
                bot_message_queue AS q21 
            WHERE
                q21.status = 1 
                AND q.botId = q21.botId 
            GROUP BY
                q21.botId 
            HAVING
                COUNT(q21.botId) > ? 
            ORDER BY
                NULL
        ) 
        AND NOT EXISTS (
            SELECT
                1 
            FROM
                bot_message_queue AS q32 
            WHERE
                q32.status = 1 
                AND q.chatId = q32.chatId 
            GROUP BY
                q32.chatId 
            ORDER BY
                NULL
        ) 
        AND (
            w.retry_after IS NULL 
            OR w.retry_after <= ?
        ) 
        AND (
            w2.retry_after IS NULL 
            OR w2.retry_after <= ?
        ) 
    ORDER BY
        q.priority DESC,
        q.id DESC LIMIT 1