4

33 秒かかるクエリがあります。それを書き換えるより良い方法はありますか?どうすればプロシージャに変換できますか?

select ut.templateId,
(
case 
when ut.reportTypeId=4 then 'Account'
when ut.reportTypeId=5 then 'Campaign' 
when ut.reportTypeId=6 then 'AdGroup' 
when ut.reportTypeId=7 then 'Ad'
when ut.reportTypeId=8 then 'Keyword' 
end
)as ReportType ,
ur.reportId,
(case when timestampdiff(SECOND,b.createdTS,a.createdTS) < 5 then a.reportId else 0 end) as '<5secs',
(case when timestampdiff(SECOND,b.createdTS,a.createdTS) between 5 and 10 then a.reportId else 0 end) as '5-10secs',
(case when timestampdiff(SECOND,b.createdTS,a.createdTS) between 11 and 20 then a.reportId else 0 end) as '11-20secs',
(case when timestampdiff(SECOND,b.createdTS,a.createdTS) between 21 and 30 then a.reportId else 0 end) as '21-30secs',
(case when timestampdiff(SECOND,b.createdTS,a.createdTS) between 31 and 60 then a.reportId else 0 end) as '31-60secs',
(case when timestampdiff(SECOND,b.createdTS,a.createdTS) between 61 and 120 then a.reportId else 0 end) as '61-120secs',
(case when timestampdiff(SECOND,b.createdTS,a.createdTS) between 121 and 1800 then a.reportId else 0 end) as '2-30mins',
(case when timestampdiff(SECOND,b.createdTS,a.createdTS) > 1800 then a.reportId else 0 end) as '>30mins'
from

(select reportId,createdTS from T_ReportMonitor where status='EndSP')a,
(select reportId,createdTS from T_ReportMonitor where status='BeginSP')b,
(select templateId,reportTypeId,reportConsoleType from T_UserTemplate) ut,
(select reportId,templateId,createdTS,modifiedTS,isDeleted from T_UserReport) ur

where a.reportId=b.reportId 
and date(ur.createdTS) = 20120731
and ut.templateId=ur.templateId 
and reportConsoleType in ('Adser','APIAdser') 
and ur.isDeleted=false
and a.reportId=ur.reportId 
and ur.reportId!=313509 AND ur.reportId!=313510 AND ur.reportId!=313511 AND ur.reportId!=313512 AND ur.reportId!=313509 AND ur.reportId!=313510 AND ur.reportId!=313511 AND ur.reportId!=313512 AND ur.reportId!=313520;

クエリの説明結果は次のとおりです。

+----+-------------+-----------------+------+---------------+------+---------+------+--------+--------------------------------+
| id | select_type | table           | type | possible_keys | key  | key_len | ref  | rows   | Extra                          |
+----+-------------+-----------------+------+---------------+------+---------+------+--------+--------------------------------+
|  1 | PRIMARY     | <derived2>      | ALL  | NULL          | NULL | NULL    | NULL |  20071 |                                |
|  1 | PRIMARY     | <derived3>      | ALL  | NULL          | NULL | NULL    | NULL |  20072 | Using where; Using join buffer |
|  1 | PRIMARY     | <derived5>      | ALL  | NULL          | NULL | NULL    | NULL | 148591 | Using where; Using join buffer |
|  1 | PRIMARY     | <derived4>      | ALL  | NULL          | NULL | NULL    | NULL | 154030 | Using where; Using join buffer |
|  5 | DERIVED     | T_UserReport    | ALL  | NULL          | NULL | NULL    | NULL | 124008 |                                |
|  4 | DERIVED     | T_UserTemplate  | ALL  | NULL          | NULL | NULL    | NULL | 151745 |                                |
|  3 | DERIVED     | T_ReportMonitor | ALL  | NULL          | NULL | NULL    | NULL |  60849 | Using where                    |
|  2 | DERIVED     | T_ReportMonitor | ALL  | NULL          | NULL | NULL    | NULL |  60849 | Using where                    |
+----+-------------+-----------------+------+---------------+------+---------+------+--------+--------------------------------+

where句やその他の比較で使用される列にキーがありますが、それらのいずれもクエリで使用されていません。それらがクエリから派生したためです。

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2 に答える 2

2

クエリの主な問題は、サブクエリを使用していることです。MySQL は基本的に、サブクエリ用にメモリ内 (またはディスク上) に新しいテーブルを作成するため、サブクエリでインデックスを使用できません。代わりに結合を試みてください。

これを試してください

select ut.templateId,
(
case 
when ut.reportTypeId=4 then 'Account'
when ut.reportTypeId=5 then 'Campaign' 
when ut.reportTypeId=6 then 'AdGroup' 
when ut.reportTypeId=7 then 'Ad'
when ut.reportTypeId=8 then 'Keyword' 
end
)as ReportType ,
ur.reportId,
(case when timestampdiff(SECOND,b.createdTS,a.createdTS) < 5 then a.reportId else 0 end) as '<5secs',
(case when timestampdiff(SECOND,b.createdTS,a.createdTS) between 5 and 10 then a.reportId else 0 end) as '5-10secs',
(case when timestampdiff(SECOND,b.createdTS,a.createdTS) between 11 and 20 then a.reportId else 0 end) as '11-20secs',
(case when timestampdiff(SECOND,b.createdTS,a.createdTS) between 21 and 30 then a.reportId else 0 end) as '21-30secs',
(case when timestampdiff(SECOND,b.createdTS,a.createdTS) between 31 and 60 then a.reportId else 0 end) as '31-60secs',
(case when timestampdiff(SECOND,b.createdTS,a.createdTS) between 61 and 120 then a.reportId else 0 end) as '61-120secs',
(case when timestampdiff(SECOND,b.createdTS,a.createdTS) between 121 and 1800 then a.reportId else 0 end) as '2-30mins',
(case when timestampdiff(SECOND,b.createdTS,a.createdTS) > 1800 then a.reportId else 0 end) as '>30mins'
from
T_ReportMonitor as a JOIN T_ReportMonitor as b ON (a.reportId=b.reportId) JOIN  T_UserReport as ur ON (a.reportId=ur.reportId) JOIN T_UserTemplate as ut ON (ut.templateId=ur.templateId)
WHERE a.status='EndSP' AND b.status='BeginSP'
and date(ur.createdTS) = 20120731
and reportConsoleType in ('Adser','APIAdser') 
and ur.isDeleted=false
and ur.reportId NOT IN (313509,313510,313511,313512,313509,313510,313511,313512,313520);

T_ReportMonitor.reportId、T_ReportMonitor.status、および T_UserReport.reportId にキーがあることを確認してください。

クエリを劣化させるものがもう 1 つあります。whereで関数を使用する：

date(ur.createdTS)

これは、MySQL が各行を処理して、この関数の結果がどうなるかを確認する必要があることを意味します。これは、パフォーマンスの最大の向上であると証明されることさえあります。そのフィールドを日付フィールドにする（または新しい日付フィールドを作成する）か、次のようなものを使用してみてください

WHERE ur.createdTS>='2012-07-31 00:00:00' AND ur.createdTS<='2012-07-31 23:95:59'
于 2012-10-10T07:00:46.187 に答える