Greg Liwood escribió un procedimiento para detectar los índices duplicados en SQL Server, lo cual ayuda a mejorar el desempeño.

 

exec sp_MSForEachTable ‘usp_duplicateindexes”?”’

Here’s the proc script:

USE master

GO

create procedure [dbo].[usp_duplicateindexes]

@tablename varchar(255)

as

set nocount on

print @tablename

–dump sp_helpindex into temp table

if object_id(‘tempdb..#helpindex’) > 0 drop table #helpindex

create table #helpindex (

index_name varchar (900) not null primary key

, index_description varchar (1000) null

, index_keys varchar (1000) null)

insert #helpindex exec sp_helpindex @tablename

–add [inccols] to temp table & cursor over output, adding included col defs

alter table #helpindex add inccols varchar(1000) null

declare cr cursor for

select si.name, sc.name

from sysobjects so

join sysindexes si on so.id = si.id

join sys.index_columns ic on si.id = ic.object_id and si.indid = ic.index_id

join sys.columns sc on ic.object_id = sc.object_id and ic.column_id = sc.column_id

where so.xtype = ‘U’

and so.name = @tablename

and ic.is_included_column = 1

order by si.name, ic.index_column_id

declare @siname varchar(1000), @scname varchar(1000)

open cr

fetch next from cr into @siname, @scname

while @@fetch_status = 0

begin

update #helpindex set inccols = isnull(inccols , ”) + @scname + ‘, ‘ where index_name = @siname

fetch next from cr into @siname, @scname

end

update #helpindex set inccols = left(inccols, datalength(inccols) – 2) where right(inccols, 2) = ‘, ‘

close cr

deallocate cr

–dump duplicates into second temp table & pump results if there are any

if object_id(‘tempdb..#helpindex2’) > 0 drop table #helpindex2

create table #helpindex2 (

index_name varchar (900) not null primary key

, index_description varchar (1000) null

, index_keys varchar (1000) null

, inccols varchar(1000) null

)

insert into #helpindex2

select hi.index_name, hi.index_description, hi.index_keys, hi.inccols

from #helpindex hi

join #helpindex h2 on hi.index_keys=h2.index_keys

and hi.index_description=h2.index_description

and hi.index_name<>h2.index_name

if @@rowcount > 0

select @tablename as “tablename”, * from #helpindex2 order by index_name, index_keys, inccols

–cleanup temp objects

if object_id(‘tempdb..#helpindex2’) > 0 drop table #helpindex2

if object_id(‘tempdb..#helpindex’) > 0 drop table #helpindex

 

Slds

Eduardo Castro – Comunidad Windows http://mswindowscr.org