（转）大数据量分页存储过程效率测试附代码

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

1create database data_Test  --创建数据库data_Test
2GO
3use data_Test
4GO
5create table tb_TestTable   --创建表
6(
7    id int identity(1,1) primary key,
8    userName nvarchar(20) not null,
9    userPWD nvarchar(20) not null,
10    userEmail nvarchar(40) null
11)
12GO

然后我们在数据表中插入2000000条数据:

1--插入数据
2set identity_insert tb_TestTable on
3declare @count int
4set @count=1
5while @count<=2000000
6begin 
7    insert into tb_TestTable(id,userName,userPWD,userEmail) values(@count,'admin','admin888','lli0077@yahoo.com.cn')
8    set @count=@count+1
9end
10set 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：

1create procedure proc_paged_with_notin  --利用select top and select not in
2(
3    @pageIndex int,  --页索引
4    @pageSize int    --每页记录数
5)
6as
7begin
8    set nocount on;
9    declare @timediff datetime --耗时
10    declare @sql nvarchar(500)
11    select @timediff=Getdate()
12    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'
13    execute(@sql)  --因select top后不支技直接接参数，所以写成了字符串@sql
14    select datediff(ms,@timediff,GetDate()) as 耗时
15    set nocount off;
16end

2,利用select top 和 select max(列键)

1create procedure proc_paged_with_selectMax  --利用select top and select max(列)
2(
3    @pageIndex int,  --页索引
4    @pageSize int    --页记录数
5)
6as
7begin
8set nocount on;
9    declare @timediff datetime
10    declare @sql nvarchar(500)
11    select @timediff=Getdate()
12    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'
13    execute(@sql)
14    select datediff(ms,@timediff,GetDate()) as 耗时
15set nocount off;
16end

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

1create procedure proc_paged_with_Midvar  --利用ID>最大ID值和中间变量
2(
3    @pageIndex int,
4    @pageSize int
5)
6as
7    declare @count int
8    declare @ID int
9    declare @timediff datetime
10    declare @sql nvarchar(500)
11begin
12set nocount on;
13    select @count=0,@ID=0,@timediff=getdate()
14    select @count=@count+1,@ID=case when @count<=@pageSize*@pageIndex then ID else @ID end from tb_testTable order by id
15    set @sql='select top '+str(@pageSize)+' * from tb_testTable where ID>'+str(@ID)
16    execute(@sql)
17    select datediff(ms,@timediff,getdate()) as 耗时
18set nocount off;
19end
20

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

1create procedure proc_paged_with_Rownumber  --利用SQL 2005中的Row_number()
2(
3    @pageIndex int,
4    @pageSize int
5)
6as
7    declare @timediff datetime
8begin
9set nocount on;
10    select @timediff=getdate()
11    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)
12    select datediff(ms,@timediff,getdate()) as 耗时
13set nocount off;
14end
15

5，利用临时表及Row_number

1create procedure proc_CTE  --利用临时表及Row_number
2(
3    @pageIndex int,  --页索引
4    @pageSize int    --页记录数
5)
6as
7    set nocount on;
8    declare @ctestr nvarchar(400)
9    declare @strSql nvarchar(400)
10    declare @datediff datetime
11begin
12    select @datediff=GetDate()
13    set @ctestr='with Table_CTE as
14                (select ceiling((Row_number() over(order by ID ASC))/'+str(@pageSize)+') as page_num,* from tb_TestTable)';
15    set @strSql=@ctestr+' select * From Table_CTE where page_num='+str(@pageIndex)
16end
17    begin
18        execute sp_executesql @strSql
19        select datediff(ms,@datediff,GetDate())
20    set nocount off;
21    end
22

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。

  1--/*-----存储过程 分页处理 孙伟 2005-03-28创建 -------*/
  2--/*-----存储过程 分页处理 浪尘 2008-9-1修改----------*/
  3--/*----- 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 -------*/
  4
  5alter PROCEDURE proc_paged_2part_selectMax
  6(
  7@tblName     nvarchar(200),        ----要显示的表或多个表的连接
  8@fldName     nvarchar(500) = '*',    ----要显示的字段列表
  9@pageSize    int = 10,        ----每页显示的记录个数
10@page        int = 1,        ----要显示那一页的记录
11@fldSort    nvarchar(200) = null,    ----排序字段列表或条件
12@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 ')
13@strCondition    nvarchar(1000) = null,    ----查询条件,不需where
14@ID        nvarchar(150),        ----主表的主键
15@Dist                 bit = 0,           ----是否添加查询字段的 DISTINCT 默认0不添加/1添加
16@pageCount    int = 1 output,            ----查询结果分页后的总页数
17@Counts    int = 1 output                ----查询到的记录数
18)
19AS
20SET NOCOUNT ON
21Declare @sqlTmp nvarchar(1000)        ----存放动态生成的SQL语句
22Declare @strTmp nvarchar(1000)        ----存放取得查询结果总数的查询语句
23Declare @strID     nvarchar(1000)        ----存放取得查询开头或结尾ID的查询语句
24
25Declare @strSortType nvarchar(10)    ----数据排序规则A
26Declare @strFSortType nvarchar(10)    ----数据排序规则B
27
28Declare @SqlSelect nvarchar(50)         ----对含有DISTINCT的查询进行SQL构造
29Declare @SqlCounts nvarchar(50)          ----对含有DISTINCT的总数查询进行SQL构造
30
31declare @timediff datetime  --耗时测试时间差
32select @timediff=getdate()
33
34if @Dist  = 0
35begin
36    set @SqlSelect = 'select '
37    set @SqlCounts = 'Count(*)'
38end
39else
40begin
41    set @SqlSelect = 'select distinct '
42    set @SqlCounts = 'Count(DISTINCT '+@ID+')'
43end
44
45
46if @Sort=0
47begin
48    set @strFSortType=' ASC '
49    set @strSortType=' DESC '
50end
51else
52begin
53    set @strFSortType=' DESC '
54    set @strSortType=' ASC '
55end
56
57
58
59--------生成查询语句--------
60--此处@strTmp为取得查询结果数量的语句
61if @strCondition is null or @strCondition=''     --没有设置显示条件
62begin
63    set @sqlTmp =  @fldName + ' From ' + @tblName
64    set @strTmp = @SqlSelect+' @Counts='+@SqlCounts+' FROM '+@tblName
65    set @strID = ' From ' + @tblName
66end
67else
68begin
69    set @sqlTmp = + @fldName + 'From ' + @tblName + ' where (1>0) ' + @strCondition
70    set @strTmp = @SqlSelect+' @Counts='+@SqlCounts+' FROM '+@tblName + ' where (1>0) ' + @strCondition
71    set @strID = ' From ' + @tblName + ' where (1>0) ' + @strCondition
72end
73
74----取得查询结果总数量-----
75exec sp_executesql @strTmp,N'@Counts int out ',@Counts out
76declare @tmpCounts int
77if @Counts = 0
78    set @tmpCounts = 1
79else
80    set @tmpCounts = @Counts
81
82    --取得分页总数
83    set @pageCount=(@tmpCounts+@pageSize-1)/@pageSize
84
85    /**//**//**//**当前页大于总页数 取最后一页**/
86    if @page>@pageCount
87        set @page=@pageCount
88
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 
92
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

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

这种测试只在单机进行，并且没有在实际开发WEB项目中分页测试，测试项也比较单一，所以不够全面系统，但从其效率相比上，我们可以在数据库分页算法上进行有效的控制。

分类: MSSQL

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