SQLServer 表的索引碎片查询和处理_Sql Server

1.查看索引的碎片率

				?

									SELECT object_name(ips.object_id) AS TableName, ips.index_id, name AS IndexName, 

									avg_fragmentation_in_percent,db_name(ips.database_id) AS DatabaseName

									FROM sys.dm_db_index_physical_stats

									    (Db_id(DB_NAME())

									        , NULL

									        , NULL

									        , NULL

									        , NULL) AS ips

									INNER JOIN sys.indexes AS SI ON ips.object_id = SI.object_id AND ips.index_id = SI.index_id

									WHERE ips.avg_fragmentation_in_percent > 5 AND SI.index_id <> 0

索引的碎片率低于5%或者，索引的页数少于1000，可以忽略；
索引碎片率在5%-30%之间的，建议reorganize；
索引碎片率大于30%的，建议rebuild。

2.reorganize索引

				?

									alter index [索引名] on [dbo].[表名] reorganize;

3.rebuild索引

				?

									alter index [索引名] on [dbo].[表名] rebuild;

4.rebuild表上所有的索引

				?

									alter index all on [dbo].[表名] rebuild;

5.rebuild数据库中所有的索引　　

				?

									USE [数据库名]

									GO

									DECLARE @NoOfPartitions BIGINT;

									DECLARE @objectid INT;

									DECLARE @indexid INT;

									DECLARE @idxname NVARCHAR(255);

									DECLARE @objname NVARCHAR(255);

									DECLARE @partitionnum BIGINT;

									DECLARE @schemaname NVARCHAR(255);

									DECLARE @partitions BIGINT;

									DECLARE @frag FLOAT;

									DECLARE @statement VARCHAR(8000);

									-- checking existance of the table that we create for temporary purpose

									IF OBJECT_ID('defrag_work', 'U') IS NOT NULL

									  DROP TABLE defrag_work;

									-- Copy the fragmented indexes data into defrag_work table

									-- All the indexes that has fragmentation < 5 are getting stored into our work table

									SELECT  [object_id] AS objectid ,

									        index_id AS indexid ,

									        partition_number AS partition_no ,

									        avg_fragmentation_in_percent AS frag

									INTO    defrag_work

									FROM    sys.dm_db_index_physical_stats(DB_ID(), NULL, NULL, NULL, 'LIMITED')

									WHERE   avg_fragmentation_in_percent >5.0 and index_id > 0;

									-- cursor to process the list of partitions

									DECLARE partitions CURSOR

									FOR

									    SELECT  *

									    FROM    defrag_work;

									-- Open the cursor.

									OPEN partitions;

									-- Looping through the partitions

									FETCH NEXT

									   FROM partitions

									   INTO @objectid, @indexid, @partitionnum, @frag;

									WHILE @@FETCH_STATUS = 0

									    BEGIN;

									        SELECT  @objname= QUOTENAME(so.name) ,

									                @schemaname = QUOTENAME(ss.name)

									        FROM    sys.objects AS so

									                JOIN sys.schemas AS ss ON ss.schema_id = so.schema_id

									        WHERE   so.object_id = @objectid;

									        SELECT  @idxname = QUOTENAME(name)

									        FROM    sys.indexes

									        WHERE   object_id = @objectid

									                AND index_id = @indexid;

									        SELECT  @NoOfPartitions = COUNT(*)

									        FROM    sys.partitions

									        WHERE   object_id = @objectid

									                AND index_id = @indexid;

									/*

									Let's say N = fragmentation percentage

									N <= 5 = IGNORE

									5 < N < 30 = REORGANIZE

									N > 30 = REBUILD

									*/

									        IF (@frag < 30.0) -- @frag > 5 is already filtered in our first query, so we need that condition here

									            BEGIN;

									                SELECT  @statement = 'ALTER INDEX ' + @idxname + ' ON '

									                        + @schemaname + '.' + @objname + ' REORGANIZE';

									                IF @NoOfPartitions > 1

									                    SELECT  @statement = @statement + ' PARTITION='

									                            + CONVERT (CHAR, @partitionnum);

									                EXEC (@statement);

									            END;

									        IF @frag >= 30.0

									            BEGIN;

									                SELECT  @statement = 'ALTER INDEX ' + @idxname + ' ON '

									                        + @schemaname + '.' + @objname + ' REBUILD';

									                IF @NoOfPartitions > 1

									                    SELECT  @statement = @statement + ' PARTITION='

									                            + CONVERT (CHAR, @partitionnum);

									                EXEC (@statement);

									            END;

									        PRINT 'Executed ' + @statement;

									        FETCH NEXT FROM partitions INTO @objectid, @indexid, @partitionnum,

									            @frag;

									    END;

									-- Close and deallocate the cursor.

									CLOSE partitions;

									DEALLOCATE partitions;

									-- drop the table

									IF OBJECT_ID('defrag_work', 'U') IS NOT NULL

									  DROP TABLE defrag_work;