Question

有人可以告诉我不同之处......我不知道是什么问题，不知道如何用几句话来描述它上面的stackoverflow，）........

我的SQL Server 2008 R2 x64上的这个选择需要 1min和16secons ：

select T_MESSAGE.MSG_GUID from T_MESSAGE
where 
T_MESSAGE.MSG_BODY like @searchpattern
or T_MESSAGE.MSG_COMMENT like @searchpattern
or T_MESSAGE.MSG_SEDERDISPLAYINFORMATION like @searchpattern 
or (select COUNT(*) from T_RECIPIENT 
          join T_RECIPIENT_ANDROID on T_RECIPIENT_ANDROID.RAND_REC_GUID = T_RECIPIENT.REC_GUID 
    where T_RECIPIENT.REC_MSG_GUID = T_MESSAGE.MSG_GUID 
    and T_RECIPIENT_ANDROID.RAND_DEVICETOKEN like @searchpattern) > 0   
or (select COUNT(*) from T_RECIPIENT 
    join T_RECIPIENT_IOS on T_RECIPIENT_IOS.RIOS_REC_GUID = T_RECIPIENT.REC_GUID 
    where T_RECIPIENT.REC_MSG_GUID = T_MESSAGE.MSG_GUID 
    and T_RECIPIENT_IOS.RIOS_DEVICETOKEN like @searchpattern) > 0
or (select COUNT(*) from T_RECIPIENT 
    join T_RECIPIENT_SMS on T_RECIPIENT_SMS.RSMS_REC_GUID = T_RECIPIENT.REC_GUID 
    where T_RECIPIENT.REC_MSG_GUID = T_MESSAGE.MSG_GUID 
    and T_RECIPIENT_SMS.RSMS_PHONENUMBER like @searchpattern) > 0
or (select COUNT(*) from T_RECIPIENT 
    join T_RECIPIENT_SMTP on T_RECIPIENT_SMTP.RSMTP_REC_GUID = T_RECIPIENT.REC_GUID 
    where T_RECIPIENT.REC_MSG_GUID = T_MESSAGE.MSG_GUID 
    and T_RECIPIENT_SMTP.RSMTP_ADDRESS like @searchpattern) > 0

此代码只需几毫秒 ..

select T_MESSAGE.MSG_GUID from T_MESSAGE
where 
T_MESSAGE.MSG_BODY like @searchpattern
or T_MESSAGE.MSG_COMMENT like @searchpattern
or T_MESSAGE.MSG_SEDERDISPLAYINFORMATION like @searchpattern 
or (select COUNT(*) from T_RECIPIENT 
          join T_RECIPIENT_ANDROID on T_RECIPIENT_ANDROID.RAND_REC_GUID = T_RECIPIENT.REC_GUID 
    where T_RECIPIENT.REC_MSG_GUID = T_MESSAGE.MSG_GUID 
    and T_RECIPIENT_ANDROID.RAND_DEVICETOKEN like @searchpattern) > 0   
or (select COUNT(*) from T_RECIPIENT 
    join T_RECIPIENT_IOS on T_RECIPIENT_IOS.RIOS_REC_GUID = T_RECIPIENT.REC_GUID 
    where T_RECIPIENT.REC_MSG_GUID = T_MESSAGE.MSG_GUID 
    and T_RECIPIENT_IOS.RIOS_DEVICETOKEN like @searchpattern) > 0
or (select COUNT(*) from T_RECIPIENT 
    join T_RECIPIENT_SMS on T_RECIPIENT_SMS.RSMS_REC_GUID = T_RECIPIENT.REC_GUID 
    where T_RECIPIENT.REC_MSG_GUID = T_MESSAGE.MSG_GUID 
    and T_RECIPIENT_SMS.RSMS_PHONENUMBER like @searchpattern) > 0

...是的！你是对的我刚删除了一个'OR块'......但是我移除了哪一个

并不重要

如果我有超过3（！）的查询需要很长时间（顺便说一句：如果一个块的结果为0，而且结果也是表空为止）

现在来了......

这个也非常快（不到一秒）并且我已经包含了所有'OR块'

declare @searchpattern as varchar(MAX)
set @searchpattern = 'mysearchstring'

declare @guidTable table
( 
    MSG_GUID UniqueIdentifier
)

insert into @guidTable 
select T_MESSAGE.MSG_GUID from T_MESSAGE
where 
T_MESSAGE.MSG_BODY like @searchpattern
or T_MESSAGE.MSG_COMMENT like @searchpattern
or T_MESSAGE.MSG_SENDERDISPLAYINFORMATION like @searchpattern 
or (select COUNT(*) from T_RECIPIENT 
    join T_RECIPIENT_ANDROID on T_RECIPIENT_ANDROID.RAND_REC_GUID = T_RECIPIENT.REC_GUID 
    where T_RECIPIENT.REC_MSG_GUID = T_MESSAGE.MSG_GUID 
    and T_RECIPIENT_ANDROID.RAND_DEVICETOKEN like @searchpattern) > 0   

insert into @guidTable 
select T_MESSAGE.MSG_GUID from T_MESSAGE 
where
(select COUNT(*) from T_RECIPIENT 
    join T_RECIPIENT_IOS on T_RECIPIENT_IOS.RIOS_REC_GUID = T_RECIPIENT.REC_GUID 
    where T_RECIPIENT.REC_MSG_GUID = T_MESSAGE.MSG_GUID 
    and T_RECIPIENT_IOS.RIOS_DEVICETOKEN like @searchpattern) > 0 

insert into @guidTable 
select T_MESSAGE.MSG_GUID from T_MESSAGE 
where
(select COUNT(*) from T_RECIPIENT 
    join T_RECIPIENT_SMS on T_RECIPIENT_SMS.RSMS_REC_GUID = T_RECIPIENT.REC_GUID 
    where T_RECIPIENT.REC_MSG_GUID = T_MESSAGE.MSG_GUID 
    and T_RECIPIENT_SMS.RSMS_PHONENUMBER like @searchpattern) > 0

insert into @guidTable 
select T_MESSAGE.MSG_GUID from T_MESSAGE 
where 
(select COUNT(*) from T_RECIPIENT 
    join T_RECIPIENT_SMTP on T_RECIPIENT_SMTP.RSMTP_REC_GUID = T_RECIPIENT.REC_GUID 
    where T_RECIPIENT.REC_MSG_GUID = T_MESSAGE.MSG_GUID 
    and T_RECIPIENT_SMTP.RSMTP_ADDRESS like @searchpattern) > 0


select * from @guidTable

...我只是拆分选择并按查询将结果查询写入新声明的表...

目前我通过在sql中创建一个函数来解决这个问题 - 但谁可以告诉我可能是什么问题？

（顺便说一下：数据库目前只有约5000个条目）

Answer 1

使用exists而不是获取您不需要的计数应该更快：

select T_MESSAGE.MSG_GUID from T_MESSAGE 
where  
T_MESSAGE.MSG_BODY like @searchpattern 
or T_MESSAGE.MSG_COMMENT like @searchpattern 
or T_MESSAGE.MSG_SEDERDISPLAYINFORMATION like @searchpattern  
or exists (select 42 from T_RECIPIENT  
          join T_RECIPIENT_ANDROID on T_RECIPIENT_ANDROID.RAND_REC_GUID = T_RECIPIENT.REC_GUID  
    and T_RECIPIENT.REC_MSG_GUID = T_MESSAGE.MSG_GUID  
    and T_RECIPIENT_ANDROID.RAND_DEVICETOKEN like @searchpattern)
or exists (select 42 from T_RECIPIENT  
    join T_RECIPIENT_IOS on T_RECIPIENT_IOS.RIOS_REC_GUID = T_RECIPIENT.REC_GUID  
    and T_RECIPIENT.REC_MSG_GUID = T_MESSAGE.MSG_GUID  
    and T_RECIPIENT_IOS.RIOS_DEVICETOKEN like @searchpattern)
or exists (select 42 from T_RECIPIENT  
    join T_RECIPIENT_SMS on T_RECIPIENT_SMS.RSMS_REC_GUID = T_RECIPIENT.REC_GUID  
    and T_RECIPIENT.REC_MSG_GUID = T_MESSAGE.MSG_GUID  
    and T_RECIPIENT_SMS.RSMS_PHONENUMBER like @searchpattern)
or exists (select 42 from T_RECIPIENT  
    join T_RECIPIENT_SMTP on T_RECIPIENT_SMTP.RSMTP_REC_GUID = T_RECIPIENT.REC_GUID  
    and T_RECIPIENT.REC_MSG_GUID = T_MESSAGE.MSG_GUID  
    and T_RECIPIENT_SMTP.RSMTP_ADDRESS like @searchpattern)

您还应确认适当的索引支持联接。

TSQL - 查询|一步一步非常快 - 但作为一个查询非常慢

1 个答案: