大数据量分页存储过程效率测试附代码

最新推荐文章于 2022-01-06 17:50:31 发布

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最新推荐文章于 2022-01-06 17:50:31 发布

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CC 4.0 BY-SA版权

文章标签：大数据数据库

原文链接：http://www.cnblogs.com/caojinqin/archive/2008/12/26/1363100.html

本文通过实验对比了五种不同分页算法在大数据量下的效率，包括利用select top和select not in、select max、中间变量、row_number以及临时表等方法，并提出了一种改进的二分法selectmax算法。

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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
2

GO
3

use data_Test
4

GO
5

create 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

)
12

然后我们在数据表中插入2000000条数据:

--插入数据
2

set identity_insert tb_TestTable on
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declare @count int
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set @count=1
5

while @count<=2000000
6

begin
7

insert into tb_TestTable(id,userName,userPWD,userEmail) values(@count,'admin','admin888','lli0077@yahoo.com.cn')
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set @count=@count+1
9

end
10

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
2

(
3

@pageIndex int, --页索引
4

@pageSize int --每页记录数
5

)
6

as
7

begin
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;
16

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)
2

(
3

@pageIndex int, --页索引
4

@pageSize int --页记录数
5

)
6

as
7

begin
8

set 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
15

set nocount off;
16

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
2

(
3

@pageIndex int,
4

@pageSize int
5

)
6

as
7

declare @count int
8

declare @ID int
9

declare @timediff datetime
10

declare @sql nvarchar(500)
11

begin
12

set 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)
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execute(@sql)
17

select datediff(ms,@timediff,getdate()) as 耗时
18

set nocount off;
19

end
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

create procedure proc_paged_with_Rownumber --利用SQL 2005中的Row_number()
2

(
3

@pageIndex int,
4

@pageSize int
5

)
6

as
7

declare @timediff datetime
8

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)
12

select datediff(ms,@timediff,getdate()) as 耗时
13

set nocount off;
14

end
15

5，利用临时表及Row_number

create 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

)
6

as
7

set nocount on;
8

declare @ctestr nvarchar(400)
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declare @strSql nvarchar(400)
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declare @datediff datetime
11

begin
12

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)
16

end
17

begin
18

execute sp_executesql @strSql
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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

180ms

470ms

156ms

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 -------*/
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

alter 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

)
19

AS
20

SET NOCOUNT ON
21

Declare @sqlTmp nvarchar(1000) ----存放动态生成的SQL语句
22

Declare @strTmp nvarchar(1000) ----存放取得查询结果总数的查询语句
23

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
26

Declare @strFSortType nvarchar(10) ----数据排序规则B
27

Declare @SqlSelect nvarchar(50) ----对含有DISTINCT的查询进行SQL构造
29

Declare @SqlCounts nvarchar(50) ----对含有DISTINCT的总数查询进行SQL构造
30

declare @timediff datetime --耗时测试时间差
32

select @timediff=getdate()
33

if @Dist = 0
35

begin
36

set @SqlSelect = 'select '
37

set @SqlCounts = 'Count(*)'
38

end
39

else
40

begin
41

set @SqlSelect = 'select distinct '
42

set @SqlCounts = 'Count(DISTINCT '+@ID+')'
43

end
44

if @Sort=0
47

begin
48

set @strFSortType=' ASC '
49

set @strSortType=' DESC '
50

end
51

else
52

begin
53

set @strFSortType=' DESC '
54

set @strSortType=' ASC '
55

end
56

--------生成查询语句--------
60

--此处@strTmp为取得查询结果数量的语句
61

if @strCondition is null or @strCondition='' --没有设置显示条件
62

begin
63

set @sqlTmp = @fldName + ' From ' + @tblName
64

set @strTmp = @SqlSelect+' @Counts='+@SqlCounts+' FROM '+@tblName
65

set @strID = ' From ' + @tblName
66

end
67

else
68

begin
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
72

end
73

----取得查询结果总数量-----
75

exec sp_executesql @strTmp,N'@Counts int out ',@Counts out
76

declare @tmpCounts int
77

if @Counts = 0
78

set @tmpCounts = 1
79

else
80

set @tmpCounts = @Counts
81

--取得分页总数
83

set @pageCount=(@tmpCounts+@pageSize-1)/@pageSize
84

/**//**//**//**当前页大于总页数取最后一页**/
86

if @page>@pageCount
87

set @page=@pageCount
88

--/*-----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

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