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百萬級數據下幾種SQL性能測試
今天閑來學習了一下SQL性能優化方面的知識，有以下學習收獲，歡迎大家指點。
測試環境：90W，單條記錄約3KB，數據庫：MSSQL2005
測試前清除緩存
DBCC FREEPROCCACHE
DBCC DROPCLEANBUFFERS
一、翻頁性能測試
1、Top
select top 10 * from message where id not in (select top 20 id frommessage where classid=77 order by id desc ) and classid=77 order by id desc
2、Max/Top
select top 10 * from message where id <(select min(id) from messagewhere id in(select top 20 id from message where classid=77 order by iddesc) ) and classid=77 order by id desc
3、row_number
select top 10 * from (select row_number()over(order by id desc) rownumber,*from message where classid=77)a where classid=77 and rownumber>20
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MsSql翻頁性能測試 |
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ID列索引 |
Top |
Max/Top |
row_number() |
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無索引 |
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聚焦索引 |
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非聚焦索引 |
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