重新生成或重新组织索引

-- 返回有关 SQL Server 实例中所有表和索引的所有统计信息.
SELECT * FROM sys.dm_db_index_physical_stats (NULL, NULL, NULL, NULL, NULL) where avg_fragmentation_in_percent>10;

-- 查看库的 database_id 值.
SELECT DB_ID ('数据库名');

-- 确保已执行USE <databasename> 语句.
SET NOCOUNT ON;
DECLARE @objectid int;
DECLARE @indexid int;
DECLARE @partitioncount bigint;
DECLARE @schemaname nvarchar(130);
DECLARE @objectname nvarchar(130);
DECLARE @indexname nvarchar(130);
DECLARE @partitionnum bigint;
DECLARE @partitions bigint;
DECLARE @frag float;
DECLARE @command nvarchar(4000);

-- 从sys.dm_db_index_physical_stats函数中筛选表和索引，并将对象和索引ID转换为名称.
SELECT
    object_id AS objectid,
    index_id AS indexid,
    partition_number AS partitionnum,
    avg_fragmentation_in_percent AS frag
INTO #work_to_do
FROM sys.dm_db_index_physical_stats (DB_ID(), NULL, NULL , NULL, 'LIMITED')
WHERE avg_fragmentation_in_percent > 10.0 AND index_id > 0;

-- 向游标声明要处理的分区列表。
DECLARE partitions CURSOR FOR SELECT * FROM #work_to_do;

-- 开启游标.
OPEN partitions;

-- 循环调用分区。
WHILE (1=1)
    BEGIN;
        FETCH NEXT
           FROM partitions
           INTO @objectid, @indexid, @partitionnum, @frag;
        IF @@FETCH_STATUS < 0 BREAK;
        SELECT @objectname = QUOTENAME(o.name), @schemaname = QUOTENAME(s.name)
        FROM sys.objects AS o
        JOIN sys.schemas as s ON s.schema_id = o.schema_id
        WHERE o.object_id = @objectid;
        SELECT @indexname = QUOTENAME(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是在 REORGANIZE 和 REBUILD 之间切换的判断条件.
        IF @frag < 30.0
            SET @command = N'ALTER INDEX ' + @indexname + N' ON ' + @schemaname + N'.' + @objectname + N' REORGANIZE';
        IF @frag >= 30.0
            SET @command = N'ALTER INDEX ' + @indexname + N' ON ' + @schemaname + N'.' + @objectname + N' REBUILD';
        IF @partitioncount > 1
            SET @command = @command + N' PARTITION=' + CAST(@partitionnum AS nvarchar(10));
        EXEC (@command);
        PRINT N'Executed: ' + @command;
    END;

-- 关闭并释放游标.
CLOSE partitions;
DEALLOCATE partitions;

-- 删除临时表.
DROP TABLE #work_to_do;
GO

-- 返回有关 SQL Server 实例中所有表和索引的所有统计信息.

SELECT * FROM sys.dm_db_index_physical_stats (NULL, NULL, NULL, NULL, NULL) where avg_fragmentation_in_percent>10;

-- 查看库的 database_id 值.

SELECT DB_ID ('数据库名');

-- 确保已执行USE <databasename> 语句.

SET NOCOUNT ON;

DECLARE @objectid int;

DECLARE @indexid int;

DECLARE @partitioncount bigint;

DECLARE @schemaname nvarchar(130);

DECLARE @objectname nvarchar(130);

DECLARE @indexname nvarchar(130);

DECLARE @partitionnum bigint;

DECLARE @partitions bigint;

DECLARE @frag float;

DECLARE @command nvarchar(4000);

-- 从sys.dm_db_index_physical_stats函数中筛选表和索引，并将对象和索引ID转换为名称.

SELECT

object_id AS objectid,

index_id AS indexid,

partition_number AS partitionnum,

avg_fragmentation_in_percent AS frag

INTO #work_to_do

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

WHERE avg_fragmentation_in_percent > 10.0 AND index_id > 0;

-- 向游标声明要处理的分区列表。

DECLARE partitions CURSOR FOR SELECT * FROM #work_to_do;

-- 开启游标.

OPEN partitions;

-- 循环调用分区。

WHILE (1=1)

BEGIN;

FETCH NEXT

FROM partitions

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

IF @@FETCH_STATUS < 0 BREAK;

SELECT @objectname = QUOTENAME(o.name), @schemaname = QUOTENAME(s.name)

FROM sys.objects AS o

JOIN sys.schemas as s ON s.schema_id = o.schema_id

WHERE o.object_id = @objectid;

SELECT @indexname = QUOTENAME(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是在 REORGANIZE 和 REBUILD 之间切换的判断条件.

IF @frag < 30.0

SET @command = N'ALTER INDEX ' + @indexname + N' ON ' + @schemaname + N'.' + @objectname + N' REORGANIZE';

IF @frag >= 30.0

SET @command = N'ALTER INDEX ' + @indexname + N' ON ' + @schemaname + N'.' + @objectname + N' REBUILD';

IF @partitioncount > 1

SET @command = @command + N' PARTITION=' + CAST(@partitionnum AS nvarchar(10));

EXEC (@command);

PRINT N'Executed: ' + @command;

END;

-- 关闭并释放游标.

CLOSE partitions;

DEALLOCATE partitions;

-- 删除临时表.

DROP TABLE #work_to_do;

文章出自: 本站技术文章均为原创，版权归 "Desen往事 - 个人博客" 所有；部分图片来源于 Yandex ，转载本站文章请注明来源。

本文标题：重新生成或重新组织索引

本文链接：https://www.desenpast.com/databases/mssql-5217.html

Desen往事

简单生活，知足常乐

重新生成或重新组织索引

发表评论取消回复

相关文章

发表评论 取消回复

发表评论取消回复