SQL Server 数据库索引整理语句,自动整理数据库索引

2022-11-12 09:49:41
内容摘要
这篇文章主要为大家详细介绍了SQL Server 数据库索引整理语句,自动整理数据库索引，具有一定的参考价值，可以用来参考一下。 对此感兴趣的朋友，看看idc笔记做的技术笔记！在一个
文章正文

这篇文章主要为大家详细介绍了SQL Server 数据库索引整理语句,自动整理数据库索引，具有一定的参考价值，可以用来参考一下。

对此感兴趣的朋友，看看idc笔记做的技术笔记！

在一个大型数据库中，数据的更改是非常频繁的。而建立在这些数据上的索引也是需要经常去维护的。否则这这些数据索引就起不到起应起的作用。甚至会成为数据库本身的负担。我们就要定期的对数据库的索引进行维护 我在MSDN上发现了这个脚本不过其中有些小问题我已经修正 大家可以使用这个脚本对数据库的索引进行日常维护

代码如下:

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<code>SET NOCOUNT ON;
DECLARE @objectid int;
DECLARE @indexid int;
DECLARE @partitioncount bigint;
DECLARE @schemaname sysname;
DECLARE @objectname sysname;
DECLARE @indexname sysname;
DECLARE @partitionnum bigint;
DECLARE @partitions bigint;
DECLARE @frag float;
DECLARE @command varchar(8000);
DECLARE @dbId int;
-- ensure the temporary table does not exist
IF EXISTS (SELECT name FROM sys.objects WHERE name = 'work_to_do')
DROP TABLE work_to_do;
-- conditionally select from the function, converting object and index IDs to names.
set @dbId=DB_ID();
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 (@dbId, NULL, NULL , NULL, 'LIMITED')
WHERE avg_fragmentation_in_percent > 10.0 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
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);
 
EXEC (@command);
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);
 
EXEC (@command);
END;
PRINT 'Executed ' + @command;
 
FETCH NEXT FROM partitions INTO @objectid, @indexid, @partitionnum, @frag;
END;
-- Close and deallocate the cursor.
CLOSE partitions;
DEALLOCATE partitions;
 
-- drop the temporary table
IF EXISTS (SELECT name FROM sys.objects WHERE name = 'work_to_do')
DROP TABLE work_to_do;
GO
</code>
这个脚本在运行时 会建立一个表 work_to_do 整理完毕后会自动删除这个表。如果大家不喜欢这样的话也可以用 一个 临时表解决 .

注：关于SQL Server 数据库索引整理语句,自动整理数据库索引的内容就先介绍到这里，更多相关文章的可以留意

代码注释
上一篇SQL Server ROW_NUMBER SQL Server 2005的LIMIT功能实现(ROW_NUMBER()排序函数)下一篇SQL Server存储过程动态参数调用实现代码

作者：喵哥笔记

IDC笔记

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