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2022-11-24
SQL
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SqlServer 重建索引

SqlServer 重建索引

sql
set nocount on --使用游标重新组织指定库中的索引,消除索引碎片 --R_T层游标取出当前数据库所有表 declare R_T cursor for select name from sys.tables declare @T varchar(50) open r_t fetch next from r_t into @t while @@fetch_status=0 begin --R_index游标判断指定表索引碎片情况并优化 declare R_Index cursor for select t.name,i.name,s.avg_fragmentation_in_percent from sys.tables t join sys.indexes i on i.object_id=t.object_id join sys.dm_db_index_physical_stats(db_id(),object_id(@T),null,null,'limited') s on s.object_id=i.object_id and s.index_id=i.index_id declare @TName varchar(50),@IName varchar(50),@avg int,@str varchar(500) open r_index fetch next from r_index into @TName,@Iname,@avg while @@fetch_status=0 begin if @avg>=30 --如果碎片大于30,重建索引 begin set @str='alter index '+rtrim(@Iname)+' on dbo.'+quotename(rtrim(@tname))+' rebuild' end else --如果碎片小于30,重新组织索引 begin set @STR='alter index '+rtrim(@Iname)+' on dbo.'+quotename(rtrim(@tname))+' reorganize' end print @str exec (@str) --执行 fetch next from r_index into @TName,@Iname,@avg end --结束r_index游标 close r_index deallocate r_index fetch next from r_t into @t end --结束R_T游标 close r_t deallocate r_t set nocount off

本文作者:SnailBoy

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