怎么对SQL Server里怎样整理索引碎片
帮助看的不是很懂，只能一个索引一个索引这样处理的吗？可不可以整个表这样处理？
[最优解释]
/******************************************************************************************
* 使用 DBCC SHOWCONTIG 和 DBCC INDEXDEFRAG 对数据库中的索引进行碎片整理
* 下例显示对数据库中碎片数量在声明的阈值之上的所有索引进行碎片整理的简单方法。
******************************************************************************************/
a
/*Perform a 'USE <database name> ' to select the database in which to run the script.*/
-- Declare variables
SET NOCOUNT ON
DECLARE @tablename VARCHAR(128)
DECLARE @execstr VARCHAR(255)
DECLARE @objectid INT
DECLARE @indexid INT
DECLARE @frag DECIMAL
DECLARE @maxfrag DECIMAL
-- Decide on the maximum fragmentation to allow
SELECT @maxfrag = 30.0
-- Declare cursor
DECLARE tables CURSOR
FOR
SELECT TABLE_NAME
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_TYPE = 'BASE TABLE '
-- Create the table
CREATE TABLE #fraglist
(
ObjectName CHAR(255), ObjectId INT, IndexName CHAR(255), IndexId INT, Lvl
INT, CountPages INT, CountRows INT, MinRecSize INT, MaxRecSize INT,
AvgRecSize INT, ForRecCount INT, Extents INT, ExtentSwitches INT,
AvgFreeBytes INT, AvgPageDensity INT, ScanDensity DECIMAL, BestCount INT,
ActualCount INT, LogicalFrag DECIMAL, ExtentFrag DECIMAL
)
-- Open the cursor
OPEN tables
-- Loop through all the tables in the database
FETCH NEXT FROM tables INTO @tablename
WHILE @@FETCH_STATUS = 0
BEGIN
-- Do the showcontig of all indexes of the table
INSERT INTO #fraglist
EXEC (
'DBCC SHOWCONTIG ( ' ' ' + @tablename + ' '
')
WITH FAST, TABLERESULTS, ALL_INDEXES, NO_INFOMSGS '
)
FETCH NEXT FROM tables INTO @tablename
END
-- Close and deallocate the cursor
CLOSE tables
DEALLOCATE tables
-- Declare cursor for list of indexes to be defragged
DECLARE indexes CURSOR
FOR
SELECT ObjectName, ObjectId, IndexId, LogicalFrag
FROM #fraglist
WHERE LogicalFrag > = @maxfrag
AND INDEXPROPERTY(ObjectId, IndexName, 'IndexDepth ') > 0
-- Open the cursor
OPEN indexes
-- loop through the indexes
FETCH NEXT FROM indexes INTO @tablename, @objectid, @indexid, @frag
WHILE @@FETCH_STATUS = 0
BEGIN
PRINT 'Executing DBCC INDEXDEFRAG (0, ' + RTRIM(@tablename) +
',' + RTRIM(@indexid) + ') - fragmentation currently '
+ RTRIM(CONVERT(VARCHAR(15), @frag)) + '% '
SELECT @execstr = 'DBCC INDEXDEFRAG (0, ' + RTRIM(@objectid) +
',' + RTRIM(@indexid) + ') '
EXEC (@execstr)
FETCH NEXT
FROM indexes
INTO @tablename, @objectid, @indexid, @frag
END
-- Close and deallocate the cursor
CLOSE indexes
DEALLOCATE indexes
-- Delete the temporary table
DROP TABLE #fraglist
GO
