大数据量分页存储过程效率测试附代码

在项目中,我们经常遇到或用到分页,那么在大数据量(百万级以上)下,哪种分页算法效率最优呢?我们不妨用事实说话。


测试环境

硬件:CPU 酷睿双核T5750  内存:2G
软件:Windows server 2003    +   Sql server 2005

OK,我们首先创建一数据库:data_Test,并在此数据库中创建一表:tb_TestTable
create database data_Test  --创建数据库data_Test

GO

use data_Test

GO

create table tb_TestTable   --创建表

(

id int identity(1,1) primary key,

userName nvarchar(20) not null,

userPWD nvarchar(20) not null,

userEmail nvarchar(40) null

)

GO

然后我们在数据表中插入2000000条数据:
 
--插入数据

set identity_insert tb_TestTable on

declare @count int

set @count=1

while @count<=2000000

begin

insert into tb_TestTable(id,userName,userPWD,userEmail) values

(@count,'admin','admin888','[email protected]')

set @count=@count+1

end

set identity_insert tb_TestTable off


我首先写了五个常用存储过程:

1,利用select top 和select not in进行分页,具体代码如下:
 
create procedure proc_paged_with_notin  --利用select top and select not in

(

@pageIndex int,  --页索引

    @pageSize int    --每页记录数

)

as

begin

set nocount on;

declare @timediff datetime --耗时

    declare @sql nvarchar(500)

select @timediff=Getdate()

set @sql='select top '+str(@pageSize)+' * from tb_TestTable where(ID not in(select top '+str(@pageSize*@pageIndex)+' id from tb_TestTable order by ID ASC)) order by ID'

execute(@sql)  --因select top后不支技直接接参数,所以写成了字符串@sql

    select datediff(ms,@timediff,GetDate()) as 耗时

set nocount off;

end

2,利用select top 和 select max(列键)
 
create procedure proc_paged_with_selectMax  --利用select top and select max(列)

(

@pageIndex int,  --页索引

    @pageSize int    --页记录数

)

as

begin

set nocount on;

declare @timediff datetime

declare @sql nvarchar(500)

select @timediff=Getdate()

set @sql='select top '+str(@pageSize)+' * From tb_TestTable where(ID>(select max(id) From (select top '+str(@pageSize*@pageIndex)+' id From tb_TestTable order by ID) as TempTable)) order by ID'

execute(@sql)

select datediff(ms,@timediff,GetDate()) as 耗时

set nocount off;

end

3,利用select top和中间变量--此方法因网上有人说效果最佳,所以贴出来一同测试
create procedure proc_paged_with_Midvar  --利用ID>最大ID值和中间变量

(

@pageIndex int,

@pageSize int

)

as

declare @count int

declare @ID int

declare @timediff datetime

declare @sql nvarchar(500)

begin

set nocount on;

select @count=0,@ID=0,@timediff=getdate()

select @count=@count+1,@ID=case when @count<=@pageSize*@pageIndex then ID else @ID end from tb_testTable order by id

set @sql='select top '+str(@pageSize)+' * from tb_testTable where ID>'+str(@ID)

execute(@sql)

select datediff(ms,@timediff,getdate()) as 耗时

set nocount off;

end

4,利用Row_number() 此方法为SQL server 2005中新的方法,利用Row_number()给数据行加上索引
create procedure proc_paged_with_Rownumber  --利用SQL 2005中的Row_number()

(

@pageIndex int,

@pageSize int

)

as

declare @timediff datetime

begin

set nocount on;

select @timediff=getdate()

select * from (select *,Row_number() over(order by ID asc) as IDRank from tb_testTable) as IDWithRowNumber where IDRank>@pageSize*@pageIndex and IDRank<@pageSize*(@pageIndex+1)

select datediff(ms,@timediff,getdate()) as 耗时

set nocount off;

end

5,利用临时表及Row_number
create procedure proc_CTE  --利用临时表及Row_number

(

@pageIndex int,  --页索引

    @pageSize int    --页记录数

)

as

set nocount on;

declare @ctestr nvarchar(400)

declare @strSql nvarchar(400)

declare @datediff datetime

begin

select @datediff=GetDate()

set @ctestr='with Table_CTE as

(select ceiling((Row_number() over(order by ID ASC))/'+str(@pageSize)+') as page_num,* from tb_TestTable)';

set @strSql=@ctestr+' select * From Table_CTE where page_num='+str(@pageIndex)

end

begin

execute sp_executesql @strSql

select datediff(ms,@datediff,GetDate())

set nocount off;

end

OK,至此,存储过程创建完毕,我们分别在每页10条数据的情况下在第2页,第1000页,第10000页,第100000页,第199999页进行测试,耗时单位:ms  每页测试5次取其平均值
存过 第2页耗时 第1000页 第10000页 第100000页 第199999页 效率排行
1用not in 0ms 16ms 47ms 475ms 953ms 3
2用select max 5ms 16ms 35ms 325ms 623ms 1
3中间变量 966ms 970ms 960ms 945ms 933ms 5
4row_number 0ms 0ms 34ms 365ms 710ms 2
5临时表 780ms 796ms 798ms 780ms 805ms 4


测试结果显示:

输出窗口 复制  保存
select max >row_number>not in>临时表>中间变量

于是我对效率最高的select max方法用2分法进行了扩展,代码取自互联网,我修改了ASC排序时取不到值的BUG,测试结果:
存过 第2页耗时 第1000页 第10000页 第100000页 第199999页 效率排行
2分法 156ms 156ms 180ms 470ms 156ms 1*

从测试结果来看,使用2分法确实可以提高效率并使效率更为稳定,我又增加了第159999页的测试,用时仅296ms,效果相当的不错!

下面是2分法使用select max的代码,已相当完善。
--/*-----存储过程 分页处理 孙伟 2005-03-28创建 -------*/

--/*-----存储过程 分页处理 浪尘 2008-9-1修改----------*/

--/*----- 对数据进行了2分处理使查询前半部分数据与查询后半部分数据性能相同 -------*/



alter PROCEDURE proc_paged_2part_selectMax

(

@tblName     nvarchar(200),        ----要显示的表或多个表的连接

@fldName     nvarchar(500) = '*',    ----要显示的字段列表

@pageSize    int = 10,        ----每页显示的记录个数

@page        int = 1,        ----要显示那一页的记录

@fldSort    nvarchar(200) = null,    ----排序字段列表或条件

@Sort        bit = 0,        ----排序方法,0为升序,1为降序(如果是多字段排列Sort指代最后一个排序字段的排列顺序(最后一个排序字段不加排序标记)--程序传参如:' SortA Asc,SortB Desc,SortC ')

@strCondition    nvarchar(1000) = null,    ----查询条件,不需where

@ID        nvarchar(150),        ----主表的主键

@Dist                 bit = 0,           ----是否添加查询字段的 DISTINCT 默认0不添加/1添加

@pageCount    int = 1 output,            ----查询结果分页后的总页数

@Counts    int = 1 output                ----查询到的记录数

)

AS

SET NOCOUNT ON

Declare @sqlTmp nvarchar(1000)        ----存放动态生成的SQL语句

Declare @strTmp nvarchar(1000)        ----存放取得查询结果总数的查询语句

Declare @strID     nvarchar(1000)        ----存放取得查询开头或结尾ID的查询语句



Declare @strSortType nvarchar(10)    ----数据排序规则A

Declare @strFSortType nvarchar(10)    ----数据排序规则B



Declare @SqlSelect nvarchar(50)         ----对含有DISTINCT的查询进行SQL构造

Declare @SqlCounts nvarchar(50)          ----对含有DISTINCT的总数查询进行SQL构造



declare @timediff datetime  --耗时测试时间差

select @timediff=getdate()

if @Dist  = 0

begin

set @SqlSelect = 'select '

set @SqlCounts = 'Count(*)'

end

else

begin

set @SqlSelect = 'select distinct '

set @SqlCounts = 'Count(DISTINCT '+@ID+')'

end

if @Sort=0

begin

set @strFSortType=' ASC '

set @strSortType=' DESC '

end

else

begin

set @strFSortType=' DESC '

set @strSortType=' ASC '

end

--------生成查询语句--------

--此处@strTmp为取得查询结果数量的语句

if @strCondition is null or @strCondition=''     --没有设置显示条件

begin

set @sqlTmp =  @fldName + ' From ' + @tblName

set @strTmp = @SqlSelect+' @Counts='+@SqlCounts+' FROM '+@tblName

set @strID = ' From ' + @tblName

end

else

begin

set @sqlTmp = + @fldName + 'From ' + @tblName + ' where (1>0) ' + @strCondition

set @strTmp = @SqlSelect+' @Counts='+@SqlCounts+' FROM '+@tblName + ' where (1>0) ' + @strCondition

set @strID = ' From ' + @tblName + ' where (1>0) ' + @strCondition

end

----取得查询结果总数量-----

exec sp_executesql @strTmp,N'@Counts int out ',@Counts out

declare @tmpCounts int

if @Counts = 0

set @tmpCounts = 1

else

set @tmpCounts = @Counts

--取得分页总数

    set @pageCount=(@tmpCounts+@pageSize-1)/@pageSize

/**当前页大于总页数 取最后一页**/

if @page>@pageCount

set @page=@pageCount

--/*-----数据分页2分处理-------*/

    declare @pageIndex int --总数/页大小

    declare @lastcount int --总数%页大小



set @pageIndex = @tmpCounts/@pageSize

set @lastcount = @tmpCounts%@pageSize

if @lastcount > 0

set @pageIndex = @pageIndex + 1

else

set @lastcount = @pagesize

--//***显示分页

    if @strCondition is null or @strCondition=''     --没有设置显示条件

    begin

if @pageIndex<2 or @page<=@pageIndex / 2 + @pageIndex % 2   --前半部分数据处理

            begin

if @page=1

set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName

+' order by '+ @fldSort +' '+ @strFSortType

else

begin

if @Sort=1

begin

set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName

+' where '+@ID+' <(select min('+ @ID +') from ('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-1) as Varchar(20)) +' '+ @ID +' from '+@tblName

+' order by '+ @fldSort +' '+ @strFSortType+') AS TBMinID)'

+' order by '+ @fldSort +' '+ @strFSortType

end

else

begin

set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName

+' where '+@ID+' >(select max('+ @ID +') from ('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-1) as Varchar(20)) +' '+ @ID +' from '+@tblName

+' order by '+ @fldSort +' '+ @strFSortType+') AS TBMinID)'

+' order by '+ @fldSort +' '+ @strFSortType

end

end

end

else

begin

set @page = @pageIndex-@page+1 --后半部分数据处理

                if @page <= 1 --最后一页数据显示

                    set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@lastcount as VARCHAR(4))+' '+ @fldName+' from '+@tblName

+' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType

else

if @Sort=1

begin

set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName

+' where '+@ID+' >(select max('+ @ID +') from('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-2)+@lastcount as Varchar(20)) +' '+ @ID +' from '+@tblName

+' order by '+ @fldSort +' '+ @strSortType+') AS TBMaxID)'

+' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType

end

else

begin

set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName

+' where '+@ID+' <(select min('+ @ID +') from('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-2)+@lastcount as Varchar(20)) +' '+ @ID +' from '+@tblName

+' order by '+ @fldSort +' '+ @strSortType+') AS TBMaxID)'

+' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType

end

end

end

else --有查询条件

    begin

if @pageIndex<2 or @page<=@pageIndex / 2 + @pageIndex % 2   --前半部分数据处理

        begin

if @page=1

set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName

+' where 1=1 ' + @strCondition + ' order by '+ @fldSort +' '+ @strFSortType

else if(@Sort=1)

begin

set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName

+' where '+@ID+' <(select min('+ @ID +') from ('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-1) as Varchar(20)) +' '+ @ID +' from '+@tblName

+' where (1=1) ' + @strCondition +' order by '+ @fldSort +' '+ @strFSortType+') AS TBMinID)'

+' '+ @strCondition +' order by '+ @fldSort +' '+ @strFSortType

end

else

begin

set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName

+' where '+@ID+' >(select max('+ @ID +') from ('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-1) as Varchar(20)) +' '+ @ID +' from '+@tblName

+' where (1=1) ' + @strCondition +' order by '+ @fldSort +' '+ @strFSortType+') AS TBMinID)'

+' '+ @strCondition +' order by '+ @fldSort +' '+ @strFSortType

end

end

else

begin

set @page = @pageIndex-@page+1 --后半部分数据处理

            if @page <= 1 --最后一页数据显示

                    set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@lastcount as VARCHAR(4))+' '+ @fldName+' from '+@tblName

+' where (1=1) '+ @strCondition +' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType

else if(@Sort=1)

set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName

+' where '+@ID+' >(select max('+ @ID +') from('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-2)+@lastcount as Varchar(20)) +' '+ @ID +' from '+@tblName

+' where (1=1) '+ @strCondition +' order by '+ @fldSort +' '+ @strSortType+') AS TBMaxID)'

+' '+ @strCondition+' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType

else

set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName

+' where '+@ID+' <(select min('+ @ID +') from('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-2)+@lastcount as Varchar(20)) +' '+ @ID +' from '+@tblName

+' where (1=1) '+ @strCondition +' order by '+ @fldSort +' '+ @strSortType+') AS TBMaxID)'

+' '+ @strCondition+' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType

end

end

------返回查询结果-----

exec sp_executesql @strTmp

select datediff(ms,@timediff,getdate()) as 耗时

--print @strTmp

SET NOCOUNT OFF

GO


执行示例:
 
exec proc_paged_2part_selectMax 'tb_testTable','ID,userName,userPWD,userEmail',10,100000,'ID',0,null,'ID',0

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