SQLSERVER索引碎片整理脚本

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-- ensure a use databse statement has been executed first.
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use DBName

set nocount on

declare @objectid         int
,@indexid          int
,@partitioncount   bigint
,@schemaname       sysname
,@objectname       sysname
,@indexname        sysname
,@partitionnum     bigint
,@partitions       bigint
,@frag             float
,@command          varchar(1000)
,@db_id          int
set @db_id = db_id()
print @db_id
select objectid     = object_id
,indexid      = index_id
,partitionnum = partition_number
,frag         = avg_fragmentation_in_percent
into #work_to_do
from sys.dm_db_index_physical_stats(@db_id,null,null,null,'LIMITED')
where avg_fragmentation_in_percent > 5.0 and index_id > 0

-- declare the cursor for the list of partitions to be processed.
declare partitions cursor for
select * from #work_to_do

-- Open the cursor.
open partitions

-- Loop through the partitions.
fetch next from partitions into @objectid, @indexid, @partitionnum, @frag

while @@fetch_status = 0 begin
select @objectname = o.name, @schemaname = s.name
from sys.objects as o
inner join sys.schemas as s
on s.schema_id = o.schema_id
where o.object_id = @objectid

select @indexname = name
from sys.indexes
where object_id = @objectid and index_id = @indexid

select @partitioncount = count (*)
from sys.partitions
where object_id = @objectid and index_id = @indexid

-- 30 is an arbitrary decision point at which to switch between reorganizing and rebuilding
if @frag < 30.0 begin
select @command = 'alter index [' + @indexname + '] on '
+ @schemaname + '.' + @objectname + ' reorganize'

if @partitioncount > 1
select @command = @command + ' partition=' + convert(char, @partitionnum)
end

if @frag >= 30.0 begin
select @command = 'alter index [' + @indexname +'] on '
+ @schemaname + '.' + @objectname + ' rebuild'

if @partitioncount > 1
select @command = @command + ' partition=' + convert(char, @partitionnum)
end
exec (@command)
print 'Executed: ' + @command

fetch next from partitions into @objectid, @indexid, @partitionnum, @frag
end

-- free resource
close partitions
deallocate partitions
drop table #work_to_do