SQLServer地址搜索性能优化

这是一个很久以前的例子，现在在整理资料时无意发现，就拿出来再改写分享。

1.需求

1.1 基本需求： 根据输入的地址关键字，搜索出完整的地址路径，耗时要控制在几十毫秒内。

1.2 数据库地址表结构和数据：

表TBAddress

表数据

1.3 例子：

e.g. 给出一个字符串如“广 大”，找出地址全路径中包含有“广” 和“大”的所有地址，結果如下：

下面将通过4个方法来实现，再分析其中的性能优劣，然后选择一个比较优的方法。

2.创建表和插入数据

2.1 创建数据表TBAddress

use test;
go
/* create table */
if object_id('TBAddress') is not null
  drop table TBAddress;
go
create table TBAddress
(
 ID int,Parent int not null,LevelNo smallint not null,Name nvarchar(50) not null,constraint PK_TBAddress primary key ( ID )
);
go
create nonclustered index ix_TBAddress_Parent on TBAddress(Parent,LevelNo) include(Name) with(fillfactor=80,pad_index=on);
create nonclustered index ix_TBAddress_Name on TBAddress(Name)include(LevelNo)with(fillfactor=80,pad_index=on);
go

create table

2.2 插入数据

use test
go
/*insert data*/
set nocount on
Begin Try
  Begin Tran
  Insert Into TBAddress ([ID],[Parent],[LevelNo],[Name])
    Select 1,N'中国' Union All 
    Select 2,1,N'直辖市' Union All 
    Select 3,N'辽宁省' Union All 
    Select 4,N'广东省' Union All 
    ... ...
    Select 44740,930,4,N'奥依塔克镇' Union All 
    Select 44741,932,N'巴音库鲁提乡' Union All 
    Select 44742,N'吉根乡' Union All 
    Select 44743,N'托云乡'
  Commit Tran
End Try
Begin Catch
  throw 50001,N'插入數據過程中發生錯誤.',1
Rollback Tran
End Catch
go

附件： insert Data

Note: 数据有44700条，insert代码比较长，所以采用附件形式。

3.测试，方法1

3.1 分析：

a. 先搜索出包字段Name中含有“广”、“大”的所有地址记录存入临时表#tmp。

b. 再找出#tmp中各个地址到Level 1的全路径。

c. 根据步骤2所得的结果，筛选出包含有“广”和“大”的地址路径。

d. 根据步骤3筛选的结果，查询所有到Level n（n为没有子地址的层编号）的地址全路径。

3.2 存储过程代码：

Use test
Go
if object_ID('[up_SearchAddressByNameV0]') is not null
  Drop Procedure [up_SearchAddressByNameV0]
Go
create proc up_SearchAddressByNameV0 
(
  @Name nvarchar(200)
)
As
set nocount on
declare @sql nvarchar(max)
declare @tmp Table (Name nvarchar(50))
set @Name=@Name+' '
while patindex('% %',@Name)>0

begin

set @Name=replace(@Name,' ',' ')

end
set @sql ='select ''' +replace(@Name,''' union all select ''')+''''

insert into @tmp(Name) exec(@sql)
if object_id('tempdb..#tmp') is not null drop table #tmp

if object_id('tempdb..#') is not null drop table #
create table #tmp(ID int )
while @Name>''

begin

insert into #tmp(ID)

select a.ID from TBAddress a where a.Name like '%'+substring(@Name,patindex('% %',@Name)-1)+'%' 
set @Name=Stuff(@Name,@Name),'')

end
;with cte_SearchParent as

(

select a.ID,a.Parent,a.LevelNo,convert(nvarchar(500),a.Name) as AddressPath from TBAddress a where exists(select 1 from #tmp x where a.ID=x.ID)

union all

select a.ID,b.Parent,b.LevelNo,b.Name+'/'+a.AddressPath) as AddressPath

from cte_SearchParent a

inner join TBAddress b on b.ID=a.Parent

--and b.LevelNo=a.LevelNo -1

and b.LevelNo>=1

)

select a.ID,a.AddressPath

into #

from cte_SearchParent a

where a.LevelNo=1 and exists(select 1 from @tmp x where a.AddressPath like '%'+x.Name+'%' having count(1)=(select count(1) from @tmp))
;with cte_result as

(

select a.ID,b.AddressPath

from TBAddress a

inner join # b on b.ID=a.ID

union all

select b.ID,a.AddressPath+'/'+b.Name) As AddressPath

from cte_result a

inner join TBAddress b on b.Parent=a.ID

--and b.LevelNo=a.LevelNo+1
)

select distinct a.ID,a.AddressPath

from cte_result a

where not exists(select 1 from TBAddress x where x.Parent=a.ID)

order by a.AddressPath

Go

procedure:up_SearchAddressByNameV0

3.3 执行查询：

exec up_SearchAddressByNameV0 '广 大'

共返回195行记录。

3.4 客户端统计信息：

平均的执行耗时: 244毫秒

4.测试，方法2

方法2是参照方法1，并借助全文索引来优化方法1中的步骤1。也就是在name列上建立全文索引，在步骤1中，通过全文索引搜索出包字段Name中含有“广”、“大”的所有地址记录存入临时表#tmp，其他步骤保持不变。

4.1 创建全文索引

use test
go
/*create fulltext index*/
if not exists(select 1 from sys.fulltext_catalogs a where a.name='ftCatalog')
begin
create fulltext catalog ftCatalog As default;
end
go
--select * From sys.fulltext_languages    
create fulltext index on TBAddress(Name language 2052 ) key index PK_TBAddress
go   
alter fulltext index on dbo.TBAddress add(Fullpath language 2052)
go

Note: 在Name列上创建全文索引使用的语言是简体中文（Simplified Chinese）

4.2 存储过程代码：

Use test
Go
if object_ID('[up_SearchAddressByNameV1]') is not null
  Drop Procedure [up_SearchAddressByNameV1]
Go
create proc up_SearchAddressByNameV1 
(
  @Name nvarchar(200)
)
As
set nocount on
declare @sql nvarchar(max),@contains nvarchar(500)
declare @tmp Table (Name nvarchar(50))
while patindex('% %',''' union all select ''')+''''

set @contains='"'+replace(@Name,'" Or "')+'"'
insert into @tmp(Name) exec(@sql)
if object_id('tempdb..#') is not null drop table #
;with cte_SearchParent as

(

select a.ID,convert(nvarchar(2000),a.Name) as AddressPath from TBAddress a where exists(select 1 from TBAddress x where contains(x.Name,@contains) And x.ID=a.ID)

union all

select a.ID,a.AddressPath

from cte_result a

where not exists(select 1 from TBAddress x where x.Parent=a.ID)

order by a.AddressPath

Go

procedure:up_SearchAddressByNameV1

4.3测试存储过程：

exec up_SearchAddressByNameV1 '广 大'

共返回195行记录。

4.4 客户端统计信息：

平均的执行耗时: 166毫秒

5.测试，方法3

在方法2中，我们在Name列上创建全文索引提高了查询性能，但我们不仅仅局限于一两个方法，下面我们介绍第3个方法。

第3个方法，通过修改表的结构和创建全文索引。在表TBAddress增加多一个字段FullPath存储各个地址到Level 1的全路径，再在FullPath列上创建全文索引，然后直接通过全文索引来搜索FullPath列中包含“广”和“大”的记录。

5.1 新增加字段FullPath，并更新列FullPath数据：

use test;
go
/*alter table */
if not exists ( select 1
            from sys.columns a
            where a.object_id = object_id('TBAddress')
                and a.name = 'Fullpath' )
  begin
     alter table TBAddress add Fullpath nvarchar(200);
  end;
go
create nonclustered index IX_TBAddress_FullPath on dbo.TBAddress(Fullpath) with(fillfactor=80,pad_index=on);
go
/*update TBAddress */
with  cte_fullPath
     as ( select ID,Parent,LevelNo,isnull(Name,'')) as FPath,Fullpath
        from dbo.TBAddress
        where LevelNo = 1
        union all
        select A.ID,A.Parent,A.LevelNo,B.FPath + '/' + isnull(A.Name,A.Fullpath
        from TBAddress as A
            inner join cte_fullPath as B on A.Parent = B.ID
       )
   update a
    set   a.Fullpath = isnull(b.FPath,a.Name)
    from dbo.TBAddress a
        left join cte_fullPath b on b.ID = a.ID;
go

5.2 在列FullPath添加全文索引：

alter fulltext index on dbo.TBAddress add(Fullpath language 2052)

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