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
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create database data_Test --创建数据库data_Test
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GO
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use data_Test
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GO
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create table tb_TestTable --创建表
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(
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id int identity(1,1) primary key,
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userName nvarchar(20) not null,
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userPWD nvarchar(20) not null,
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userEmail nvarchar(40) null
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)
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GO
然后我们在数据表中插入2000000条数据:
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--插入数据
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set identity_insert tb_TestTable on
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declare @count int
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set @count=1
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while @count<=2000000
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begin
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insert into tb_TestTable(id,userName,userPWD,userEmail) values(@count,‘admin‘,‘admin888‘,‘lli0077@yahoo.com.cn‘)
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set @count=@count+1
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end
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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:
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create procedure proc_paged_with_notin --利用select top and select not in
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(
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@pageIndex int, --页索引
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@pageSize int --每页记录数
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)
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as
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begin
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set nocount on;
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declare @timediff datetime --耗时
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declare @sql nvarchar(500)
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select @timediff=Getdate()
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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‘
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execute(@sql) --因select top后不支技直接接参数,所以写成了字符串@sql
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select datediff(ms,@timediff,GetDate()) as 耗时
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set nocount off;
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end
2,利用select top 和 select max(列键)
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create procedure proc_paged_with_selectMax --利用select top and select max(列)
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(
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@pageIndex int, --页索引
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@pageSize int --页记录数
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)
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as
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begin
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set nocount on;
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declare @timediff datetime
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declare @sql nvarchar(500)
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select @timediff=Getdate()
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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‘
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execute(@sql)
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select datediff(ms,@timediff,GetDate()) as 耗时
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set nocount off;
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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
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create procedure proc_paged_with_Midvar --利用ID>最大ID值和中间变量
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(
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@pageIndex int,
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@pageSize int
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)
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as
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declare @count int
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declare @ID int
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declare @timediff datetime
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declare @sql nvarchar(500)
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begin
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set nocount on;
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select @count=0,@ID=0,@timediff=getdate()
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select @count=@count+1,@ID=case when @count<=@pageSize*@pageIndex then ID else @ID end from tb_testTable order by id
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set @sql=‘select top ‘+str(@pageSize)+‘ * from tb_testTable where ID>‘+str(@ID)
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execute(@sql)
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select datediff(ms,@timediff,getdate()) as 耗时
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set nocount off;
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end
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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
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create procedure proc_paged_with_Rownumber --利用SQL 2005中的Row_number()
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(
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@pageIndex int,
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@pageSize int
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)
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as
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declare @timediff datetime
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begin
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set nocount on;
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select @timediff=getdate()
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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)
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select datediff(ms,@timediff,getdate()) as 耗时
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set nocount off;
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end
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5,利用临时表及Row_number
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create procedure proc_CTE --利用临时表及Row_number
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(
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@pageIndex int, --页索引
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@pageSize int --页记录数
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)
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as
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set nocount on;
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declare @ctestr nvarchar(400)
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declare @strSql nvarchar(400)
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declare @datediff datetime
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begin
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select @datediff=GetDate()
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set @ctestr=‘with Table_CTE as
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(select ceiling((Row_number() over(order by ID ASC))/‘+str(@pageSize)+‘) as page_num,* from tb_TestTable)‘;
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set @strSql=@ctestr+‘ select * From Table_CTE where page_num=‘+str(@pageIndex)
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end
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begin
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execute sp_executesql @strSql
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select datediff(ms,@datediff,GetDate())
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set nocount off;
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end
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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页耗时 |
第10000页耗时 |
第100000页耗时 |
第199999页耗时 |
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 |
4临时表 |
780ms |
796ms |
798ms |
780ms |
805ms |
4 |
测试结果显示: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:
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。
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--/*-----存储过程 分页处理 孙伟 2005-03-28创建 -------*/
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--/*-----存储过程 分页处理 浪尘 2008-9-1修改----------*/
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--/*----- 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 -------*/
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alter PROCEDURE proc_paged_2part_selectMax
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(
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@tblName nvarchar(200), ----要显示的表或多个表的连接
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@fldName nvarchar(500) = ‘*‘, ----要显示的字段列表
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@pageSize int = 10, ----每页显示的记录个数
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@page int = 1, ----要显示那一页的记录
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@fldSort nvarchar(200) = null, ----排序字段列表或条件
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@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 ‘)
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@strCondition nvarchar(1000) = null, ----查询条件,不需where
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@ID nvarchar(150), ----主表的主键
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@Dist bit = 0, ----是否添加查询字段的 DISTINCT 默认0不添加/1添加
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@pageCount int = 1 output, ----查询结果分页后的总页数
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@Counts int = 1 output ----查询到的记录数
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)
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AS
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SET NOCOUNT ON
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Declare @sqlTmp nvarchar(1000) ----存放动态生成的SQL语句
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Declare @strTmp nvarchar(1000) ----存放取得查询结果总数的查询语句
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Declare @strID nvarchar(1000) ----存放取得查询开头或结尾ID的查询语句
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Declare @strSortType nvarchar(10) ----数据排序规则A
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Declare @strFSortType nvarchar(10) ----数据排序规则B
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Declare @SqlSelect nvarchar(50) ----对含有DISTINCT的查询进行SQL构造
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Declare @SqlCounts nvarchar(50) ----对含有DISTINCT的总数查询进行SQL构造
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declare @timediff datetime --耗时测试时间差
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select @timediff=getdate()
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if @Dist = 0
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begin
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set @SqlSelect = ‘select ‘
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set @SqlCounts = ‘Count(*)‘
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end
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else
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begin
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set @SqlSelect = ‘select distinct ‘
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set @SqlCounts = ‘Count(DISTINCT ‘+@ID+‘)‘
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end
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if @Sort=0
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begin
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set @strFSortType=‘ ASC ‘
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set @strSortType=‘ DESC ‘
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end
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else
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begin
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set @strFSortType=‘ DESC ‘
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set @strSortType=‘ ASC ‘
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end
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--------生成查询语句--------
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--此处@strTmp为取得查询结果数量的语句
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if @strCondition is null or @strCondition=‘‘ --没有设置显示条件
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begin
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set @sqlTmp = @fldName + ‘ From ‘ + @tblName
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set @strTmp = @SqlSelect+‘ @Counts=‘+@SqlCounts+‘ FROM ‘+@tblName
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set @strID = ‘ From ‘ + @tblName
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end
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else
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begin
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set @sqlTmp = + @fldName + ‘From ‘ + @tblName + ‘ where (1>0) ‘ + @strCondition
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set @strTmp = @SqlSelect+‘ @Counts=‘+@SqlCounts+‘ FROM ‘+@tblName + ‘ where (1>0) ‘ + @strCondition
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set @strID = ‘ From ‘ + @tblName + ‘ where (1>0) ‘ + @strCondition
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end
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----取得查询结果总数量-----
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exec sp_executesql @strTmp,N‘@Counts int out ‘,@Counts out
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declare @tmpCounts int
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if @Counts = 0
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set @tmpCounts = 1
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else
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set @tmpCounts = @Counts
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--取得分页总数
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set @pageCount=(@tmpCounts+@pageSize-1)/@pageSize
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/**//**当前页大于总页数 取最后一页**/
86 if @page>@pageCount
87 set @page=@pageCount
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89 --/*-----数据分页2分处理-------*/
90 declare @pageIndex int --总数/页大小
91 declare @lastcount int --总数%页大小
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93 set @pageIndex = @tmpCounts/@pageSize
94 set @lastcount = @tmpCounts%@pageSize
95 if @lastcount > 0
96 set @pageIndex = @pageIndex + 1
97 else
98 set @lastcount = @pagesize
99
100 --//***显示分页
101 if @strCondition is null or @strCondition=‘‘ --没有设置显示条件
102 begin
103 if @pageIndex<2 or @page<=@pageIndex / 2 + @pageIndex % 2 --前半部分数据处理
104 begin
105 if @page=1
106 set @strTmp=@SqlSelect+‘ top ‘+ CAST(@pageSize as VARCHAR(4))+‘ ‘+ @fldName+‘ from ‘+@tblName
107 +‘ order by ‘+ @fldSort +‘ ‘+ @strFSortType
108 else
109 begin
110 if @Sort=1
111 begin
112 set @strTmp=@SqlSelect+‘ top ‘+ CAST(@pageSize as VARCHAR(4))+‘ ‘+ @fldName+‘ from ‘+@tblName
113 +‘ where ‘+@ID+‘ <(select min(‘+ @ID +‘) from (‘+ @SqlSelect+‘ top ‘+ CAST(@pageSize*(@page-1) as Varchar(20)) +‘ ‘+ @ID +‘ from ‘+@tblName
114 +‘ order by ‘+ @fldSort +‘ ‘+ @strFSortType+‘) AS TBMinID)‘
115 +‘ order by ‘+ @fldSort +‘ ‘+ @strFSortType
116 end
117 else
118 begin
119 set @strTmp=@SqlSelect+‘ top ‘+ CAST(@pageSize as VARCHAR(4))+‘ ‘+ @fldName+‘ from ‘+@tblName
120 +‘ where ‘+@ID+‘ >(select max(‘+ @ID +‘) from (‘+ @SqlSelect+‘ top ‘+ CAST(@pageSize*(@page-1) as Varchar(20)) +‘ ‘+ @ID +‘ from ‘+@tblName
121 +‘ order by ‘+ @fldSort +‘ ‘+ @strFSortType+‘) AS TBMinID)‘
122 +‘ order by ‘+ @fldSort +‘ ‘+ @strFSortType
123 end
124 end
125 end
126 else
127 begin
128 set @page = @pageIndex-@page+1 --后半部分数据处理
129 if @page <= 1 --最后一页数据显示
130 set @strTmp=@SqlSelect+‘ * from (‘+@SqlSelect+‘ top ‘+ CAST(@lastcount as VARCHAR(4))+‘ ‘+ @fldName+‘ from ‘+@tblName
131 +‘ order by ‘+ @fldSort +‘ ‘+ @strSortType+‘) AS TempTB‘+‘ order by ‘+ @fldSort +‘ ‘+ @strFSortType
132 else
133 if @Sort=1
134 begin
135 set @strTmp=@SqlSelect+‘ * from (‘+@SqlSelect+‘ top ‘+ CAST(@pageSize as VARCHAR(4))+‘ ‘+ @fldName+‘ from ‘+@tblName
136 +‘ where ‘+@ID+‘ >(select max(‘+ @ID +‘) from(‘+ @SqlSelect+‘ top ‘+ CAST(@pageSize*(@page-2)+@lastcount as Varchar(20)) +‘ ‘+ @ID +‘ from ‘+@tblName
137 +‘ order by ‘+ @fldSort +‘ ‘+ @strSortType+‘) AS TBMaxID)‘
138 +‘ order by ‘+ @fldSort +‘ ‘+ @strSortType+‘) AS TempTB‘+‘ order by ‘+ @fldSort +‘ ‘+ @strFSortType
139 end
140 else
141 begin
142 set @strTmp=@SqlSelect+‘ * from (‘+@SqlSelect+‘ top ‘+ CAST(@pageSize as VARCHAR(4))+‘ ‘+ @fldName+‘ from ‘+@tblName
143 +‘ where ‘+@ID+‘ <(select min(‘+ @ID +‘) from(‘+ @SqlSelect+‘ top ‘+ CAST(@pageSize*(@page-2)+@lastcount as Varchar(20)) +‘ ‘+ @ID +‘ from ‘+@tblName
144 +‘ order by ‘+ @fldSort +‘ ‘+ @strSortType+‘) AS TBMaxID)‘
145 +‘ order by ‘+ @fldSort +‘ ‘+ @strSortType+‘) AS TempTB‘+‘ order by ‘+ @fldSort +‘ ‘+ @strFSortType
146 end
147 end
148 end
149
150 else --有查询条件
151 begin
152 if @pageIndex<2 or @page<=@pageIndex / 2 + @pageIndex % 2 --前半部分数据处理
153 begin
154 if @page=1
155 set @strTmp=@SqlSelect+‘ top ‘+ CAST(@pageSize as VARCHAR(4))+‘ ‘+ @fldName+‘ from ‘+@tblName
156 +‘ where 1=1 ‘ + @strCondition + ‘ order by ‘+ @fldSort +‘ ‘+ @strFSortType
157 else if(@Sort=1)
158 begin
159 set @strTmp=@SqlSelect+‘ top ‘+ CAST(@pageSize as VARCHAR(4))+‘ ‘+ @fldName+‘ from ‘+@tblName
160 +‘ where ‘+@ID+‘ <(select min(‘+ @ID +‘) from (‘+ @SqlSelect+‘ top ‘+ CAST(@pageSize*(@page-1) as Varchar(20)) +‘ ‘+ @ID +‘ from ‘+@tblName
161 +‘ where (1=1) ‘ + @strCondition +‘ order by ‘+ @fldSort +‘ ‘+ @strFSortType+‘) AS TBMinID)‘
162 +‘ ‘+ @strCondition +‘ order by ‘+ @fldSort +‘ ‘+ @strFSortType
163 end
164 else
165 begin
166 set @strTmp=@SqlSelect+‘ top ‘+ CAST(@pageSize as VARCHAR(4))+‘ ‘+ @fldName+‘ from ‘+@tblName
167 +‘ where ‘+@ID+‘ >(select max(‘+ @ID +‘) from (‘+ @SqlSelect+‘ top ‘+ CAST(@pageSize*(@page-1) as Varchar(20)) +‘ ‘+ @ID +‘ from ‘+@tblName
168 +‘ where (1=1) ‘ + @strCondition +‘ order by ‘+ @fldSort +‘ ‘+ @strFSortType+‘) AS TBMinID)‘
169 +‘ ‘+ @strCondition +‘ order by ‘+ @fldSort +‘ ‘+ @strFSortType
170 end
171 end
172 else
173 begin
174 set @page = @pageIndex-@page+1 --后半部分数据处理
175 if @page <= 1 --最后一页数据显示
176 set @strTmp=@SqlSelect+‘ * from (‘+@SqlSelect+‘ top ‘+ CAST(@lastcount as VARCHAR(4))+‘ ‘+ @fldName+‘ from ‘+@tblName
177 +‘ where (1=1) ‘+ @strCondition +‘ order by ‘+ @fldSort +‘ ‘+ @strSortType+‘) AS TempTB‘+‘ order by ‘+ @fldSort +‘ ‘+ @strFSortType
178 else if(@Sort=1)
179 set @strTmp=@SqlSelect+‘ * from (‘+@SqlSelect+‘ top ‘+ CAST(@pageSize as VARCHAR(4))+‘ ‘+ @fldName+‘ from ‘+@tblName
180 +‘ where ‘+@ID+‘ >(select max(‘+ @ID +‘) from(‘+ @SqlSelect+‘ top ‘+ CAST(@pageSize*(@page-2)+@lastcount as Varchar(20)) +‘ ‘+ @ID +‘ from ‘+@tblName
181 +‘ where (1=1) ‘+ @strCondition +‘ order by ‘+ @fldSort +‘ ‘+ @strSortType+‘) AS TBMaxID)‘
182 +‘ ‘+ @strCondition+‘ order by ‘+ @fldSort +‘ ‘+ @strSortType+‘) AS TempTB‘+‘ order by ‘+ @fldSort +‘ ‘+ @strFSortType
183 else
184 set @strTmp=@SqlSelect+‘ * from (‘+@SqlSelect+‘ top ‘+ CAST(@pageSize as VARCHAR(4))+‘ ‘+ @fldName+‘ from ‘+@tblName
185 +‘ where ‘+@ID+‘ <(select min(‘+ @ID +‘) from(‘+ @SqlSelect+‘ top ‘+ CAST(@pageSize*(@page-2)+@lastcount as Varchar(20)) +‘ ‘+ @ID +‘ from ‘+@tblName
186 +‘ where (1=1) ‘+ @strCondition +‘ order by ‘+ @fldSort +‘ ‘+ @strSortType+‘) AS TBMaxID)‘
187 +‘ ‘+ @strCondition+‘ order by ‘+ @fldSort +‘ ‘+ @strSortType+‘) AS TempTB‘+‘ order by ‘+ @fldSort +‘ ‘+ @strFSortType
188 end
189 end
190
191------返回查询结果-----
192exec sp_executesql @strTmp
193select datediff(ms,@timediff,getdate()) as 耗时
194--print @strTmp
195SET NOCOUNT OFF
196GO
197