Php mysql长时间查询

我对我的PHP脚本有一个查询，它花费的时间太长了！ 当我运行查询时，服务器加载时间增加，服务器停机

注意：这些字段是索引：t1.提交id，t4.提交id，t3.用户id，t1.用户id，所有者id，邀请id，同意，t2.用户id，t1.发送时间戳

SELECT
t1.submits_id,t1.user_id,is_html,shared_from,type,contents,url,sent_timestamp,show_type,album_cached_info,
t2.users_id,name,t2.active,page_url,
t3.time,
t4.like_time
FROM iv6_submits as t1 LEFT JOIN iv6_likes as t4 ON (t1.submits_id = t4.submit_id AND t4.user_id=1)

,iv6_users as t2 LEFT JOIN iv6_onlineusers as t3 ON (t2.users_id=t3.userid)
WHERE
t1.submits_id<19000 AND 
(t1.user_id=1 OR t1.user_id in
    (select IF(owner_id=1,invited_id,owner_id) as id
        from iv6_add_lists
            where ((owner_id=1 or invited_id=1) AND agreed=1) OR (owner_id=1 AND agreed=2)))
AND t2.users_id=t1.user_id
ORDER BY t1.sent_timestamp DESC LIMIT 10

选择
t1.提交\ id，t1.用户\ id，是\ html，共享\来源，类型，内容，url，发送\时间戳，显示\类型，相册\缓存\信息，
t2.用户id、名称、t2.活动、页面url、，
时间，
t4.喜欢的时间
从iv6提交为t1左连接iv6提交为t4 ON（t1.submits\u id=t4.submit\u id和t4.user\u id=1）
，iv6_用户作为t2左连接iv6_在线用户作为t3打开（t2.users_id=t3.userid）
哪里
t1.提交\u id我建议您拆分查询以查看资源的消耗位置


在WHERE部分执行子查询，看看它是否运行得很快
移除左侧连接，然后逐个添加，以查看所有连接的位置
删除所有“WHERE”条件并逐个添加
尝试在不使用“orderby”语句的情况下运行查询

您没有将t4.user_id作为索引，这可能很重要。
表iv6_add_列表还应该包含WHERE语句中的所有字段

还建议您在t1和t2之间进行内部连接：

FROM (iv6_submits as t1 
        LEFT JOIN iv6_likes as t4 ON (t1.submits_id = t4.submit_id AND t4.user_id=1))
     INNER JOIN 
    (iv6_users as t2 
        LEFT JOIN iv6_onlineusers as t3 ON (t2.users_id=t3.userid))

    ON t2.users_id=t1.user_id

然后你可以移除

AND t2.users_id=t1.user_id

从WHERE语句中。
我建议您拆分查询以查看资源的消耗位置


在WHERE部分执行子查询，看看它是否运行得很快
移除左侧连接，然后逐个添加，以查看所有连接的位置
删除所有“WHERE”条件并逐个添加
尝试在不使用“orderby”语句的情况下运行查询

您没有将t4.user_id作为索引，这可能很重要。
表iv6_add_列表还应该包含WHERE语句中的所有字段

还建议您在t1和t2之间进行内部连接：

FROM (iv6_submits as t1 
        LEFT JOIN iv6_likes as t4 ON (t1.submits_id = t4.submit_id AND t4.user_id=1))
     INNER JOIN 
    (iv6_users as t2 
        LEFT JOIN iv6_onlineusers as t3 ON (t2.users_id=t3.userid))

    ON t2.users_id=t1.user_id

然后你可以移除

AND t2.users_id=t1.user_id

从WHERE语句中。
我建议您拆分查询以查看资源的消耗位置


在WHERE部分执行子查询，看看它是否运行得很快
移除左侧连接，然后逐个添加，以查看所有连接的位置
删除所有“WHERE”条件并逐个添加
尝试在不使用“orderby”语句的情况下运行查询

您没有将t4.user_id作为索引，这可能很重要。
表iv6_add_列表还应该包含WHERE语句中的所有字段

还建议您在t1和t2之间进行内部连接：

FROM (iv6_submits as t1 
        LEFT JOIN iv6_likes as t4 ON (t1.submits_id = t4.submit_id AND t4.user_id=1))
     INNER JOIN 
    (iv6_users as t2 
        LEFT JOIN iv6_onlineusers as t3 ON (t2.users_id=t3.userid))

    ON t2.users_id=t1.user_id

然后你可以移除

AND t2.users_id=t1.user_id

从WHERE语句中。
我建议您拆分查询以查看资源的消耗位置


在WHERE部分执行子查询，看看它是否运行得很快
移除左侧连接，然后逐个添加，以查看所有连接的位置
删除所有“WHERE”条件并逐个添加
尝试在不使用“orderby”语句的情况下运行查询

您没有将t4.user_id作为索引，这可能很重要。
表iv6_add_列表还应该包含WHERE语句中的所有字段

还建议您在t1和t2之间进行内部连接：

FROM (iv6_submits as t1 
        LEFT JOIN iv6_likes as t4 ON (t1.submits_id = t4.submit_id AND t4.user_id=1))
     INNER JOIN 
    (iv6_users as t2 
        LEFT JOIN iv6_onlineusers as t3 ON (t2.users_id=t3.userid))

    ON t2.users_id=t1.user_id

然后你可以移除

AND t2.users_id=t1.user_id

从WHERE语句开始。
我首先将查询写为：

    SELECT t1.submits_id, 
           t1.user_id,
           is_html,  /* I'd append all table aliases here */
           shared_from,
           type,
           contents,
           url,
           sent_timestamp,
           show_type,
           album_cached_info,
           t2.users_id,
           name,
           t2.active,page_url,
           t3.time,
           t4.like_time
      FROM iv6_submits as t1
      JOIN iv6_users as t2
        ON t2.users_id=t1.user_id
 LEFT JOIN iv6_likes as t4 
        ON t4.submit_id = t1.submits_id 
       AND t4.user_id=1
 LEFT JOIN iv6_onlineusers as t3 
        ON t3.userid = t2.users_id
     WHERE t1.submits_id<19000 
       AND (
             t1.user_id=1 
          OR t1.user_id IN (
        SELECT IF(owner_id=1,invited_id, owner_id) as id
          FROM iv6_add_lists
         WHERE ((owner_id=1 OR invited_id=1) AND agreed=1) 
            OR (owner_id=1 AND agreed=2))
           )
  ORDER BY t1.sent_timestamp DESC 
     LIMIT 10

您的子查询也是v。奇怪，我把它改写成这样：

   SELECT invited_id 
     FROM iv6_add_lists 
    WHERE owner_id = 1 
      AND agreed BETWEEN 1 AND 2
UNION ALL 
   SELECT owner_id 
     FROM iv6_add_lists  
    WHERE invited_id = 1
      AND agreed = 1
      AND owner_id != 1

看看这是否也有帮助，您可以提示每个源的索引。（owner_id，agreed，invested_id）和（invested_id，agreed，owner_id）上的复合索引应分别包含这两个查询

你也可以这样写

   SELECT 1
    UNION
   SELECT DISTINCT invited_id 
     FROM iv6_add_lists 
    WHERE owner_id = 1 
      AND agreed BETWEEN 1 AND 2
    UNION 
   SELECT DISTINCT owner_id 
     FROM iv6_add_lists  
    WHERE owner_id != 1
      AND agreed = 1
      AND invited_id = 1 

和
将它连接到您的
t1
，而不是
和（t1.user\u id=1或…）

更新

    SELECT t1.submits_id, 
           t1.user_id,
           is_html,  /* I'd append all table aliases here */
           shared_from,
           type,
           contents,
           url,
           sent_timestamp,
           show_type,
           album_cached_info,
           t2.users_id,
           name,
           t2.active,page_url,
           t3.time,
           t4.like_time
      FROM iv6_submits as t1
      JOIN iv6_users as t2
        ON t2.users_id=t1.user_id
      JOIN (
        SELECT 1 user_id
         UNION
        SELECT DISTINCT invited_id 
          FROM iv6_add_lists 
         WHERE owner_id = 1 
           AND agreed BETWEEN 1 AND 2
         UNION 
        SELECT DISTINCT owner_id 
          FROM iv6_add_lists  
         WHERE owner_id != 1
           AND agreed = 1
           AND invited_id = 1
           ) t5
        ON t1.user_id = t5.user_id
 LEFT JOIN iv6_likes as t4 
        ON t4.submit_id = t1.submits_id 
       AND t4.user_id=1
 LEFT JOIN iv6_onlineusers as t3 
        ON t3.userid = t2.users_id
     WHERE t1.submits_id<19000 
  ORDER BY t1.sent_timestamp DESC 
     LIMIT 10

选择t1.u id，
t1.U用户id，
是_html，/*我会在这里附加所有表别名*/
从，
类型，
目录
网址，
发送时间戳，
显示_类型，
相册\u缓存\u信息，
t2.用户识别码，
名称
t2.活动，第页url，
时间，
t4.喜欢的时间
从iv6开始，U作为t1提交
以t2身份加入iv6_用户
在t2.users\u id=t1.user\u id上
加入(
选择1个用户id
联合
选择不同的用户id
从iv6添加列表
其中owner_id=1
并在1和2之间达成一致
联合
选择不同的所有者id
从iv6添加列表
其中所有者id！=1
并同意=1
并且被邀请的\u id=1
)t5
在t1.user\u id=t5.user\u id上
左连接iv6_与t4一样
在t4.submit\u id=t1.submits\u id上
和t4。用户_id=1
左连接iv6_在线用户作为t3
在t3.userid=t2.users\u id上
其中t1.id我首先将查询写为：

    SELECT t1.submits_id, 
           t1.user_id,
           is_html,  /* I'd append all table aliases here */
           shared_from,
           type,
           contents,
           url,
           sent_timestamp,
           show_type,
           album_cached_info,
           t2.users_id,
           name,
           t2.active,page_url,
           t3.time,
           t4.like_time
      FROM iv6_submits as t1
      JOIN iv6_users as t2
        ON t2.users_id=t1.user_id
 LEFT JOIN iv6_likes as t4 
        ON t4.submit_id = t1.submits_id 
       AND t4.user_id=1
 LEFT JOIN iv6_onlineusers as t3 
        ON t3.userid = t2.users_id
     WHERE t1.submits_id<19000 
       AND (
             t1.user_id=1 
          OR t1.user_id IN (
        SELECT IF(owner_id=1,invited_id, owner_id) as id
          FROM iv6_add_lists
         WHERE ((owner_id=1 OR invited_id=1) AND agreed=1) 
            OR (owner_id=1 AND agreed=2))
           )
  ORDER BY t1.sent_timestamp DESC 
     LIMIT 10

您的子查询也是v。奇怪，我把它改写成这样：

   SELECT invited_id 
     FROM iv6_add_lists 
    WHERE owner_id = 1 
      AND agreed BETWEEN 1 AND 2
UNION ALL 
   SELECT owner_id 
     FROM iv6_add_lists  
    WHERE invited_id = 1
      AND agreed = 1
      AND owner_id != 1

看看这是否也有帮助，您可以提示每个源的索引。（owner_id，agreed，invested_id）和（invested_id，agreed，owner_id）上的复合索引应分别包含这两个查询

你也可以这样写

   SELECT 1
    UNION
   SELECT DISTINCT invited_id 
     FROM iv6_add_lists 
    WHERE owner_id = 1 
      AND agreed BETWEEN 1 AND 2
    UNION 
   SELECT DISTINCT owner_id 
     FROM iv6_add_lists  
    WHERE owner_id != 1
      AND agreed = 1
      AND invited_id = 1 

和
将它连接到您的
t1
，而不是
和（t1.user\u id=1或…）

更新

    SELECT t1.submits_id, 
           t1.user_id,
           is_html,  /* I'd append all table aliases here */
           shared_from,
           type,
           contents,
           url,
           sent_timestamp,
           show_type,
           album_cached_info,
           t2.users_id,
           name,
           t2.active,page_url,
           t3.time,
           t4.like_time
      FROM iv6_submits as t1
      JOIN iv6_users as t2
        ON t2.users_id=t1.user_id
      JOIN (
        SELECT 1 user_id
         UNION
        SELECT DISTINCT invited_id 
          FROM iv6_add_lists 
         WHERE owner_id = 1 
           AND agreed BETWEEN 1 AND 2
         UNION 
        SELECT DISTINCT owner_id 
          FROM iv6_add_lists  
         WHERE owner_id != 1
           AND agreed = 1
           AND invited_id = 1
           ) t5
        ON t1.user_id = t5.user_id
 LEFT JOIN iv6_likes as t4 
        ON t4.submit_id = t1.submits_id 
       AND t4.user_id=1
 LEFT JOIN iv6_onlineusers as t3 
        ON t3.userid = t2.users_id
     WHERE t1.submits_id<19000 
  ORDER BY t1.sent_timestamp DESC 
     LIMIT 10

选择t1.u id，
t1.U用户id，
是_html，/*我会在这里附加所有表别名*/
从，
类型，
目录
网址，
发送时间戳，
显示_类型，
相册\u缓存\u信息，
t2.用户识别码，
名称
t2.活动，第页url，
时间，
t4.喜欢的时间
从iv6开始，U作为t1提交
以t2身份加入iv6_用户
在t2.users\u id=t1.user\u id上
加入(
选择1个用户id
联合
选择DI