SQL Server索引维护指导

*/
create proc p_dba_manage_get_index_defrage
as
set nocount on 
if not exists(select 1 from sys.tables where name = 'dba_manage_index_defrag')
create table dba_manage_index_defrag
([db_name] varchar(255)
,[table_name] varchar(255)
,[index_name] varchar(255)
,avg_fragmentation_in_percent real
,write_time datetime default getdate()
) 
declare @db_name nvarchar(40)
set @db_name = ''
declare cur_db_name cursor for 
select 
name 
from 
sys.databases
where 
database_id > 4 and state = 0
open cur_db_name
fetch cur_db_name into @db_name
while (@@fetch_status=0)
begin
insert into dba_manage_index_defrag
([db_name]
,table_name
,index_name
,avg_fragmentation_in_percent)
SELECT 
db_name(a.database_id) [db_name],
c.name [table_name], 
b.name [index_name], 
a.avg_fragmentation_in_percent
FROM 
sys.dm_db_index_physical_stats (DB_ID(@db_name), null,NULL, NULL, 'Limited') AS a
JOIN 
sys.indexes AS b ON a.object_id = b.object_id AND a.index_id = b.index_id
join 
sys.tables as c on a.object_id = c.object_id
where 
a.index_id>0 
and a.avg_fragmentation_in_percent>5
fetch next from cur_db_name into @db_name
end
CLOSE cur_db_name
DEALLOCATE cur_db_name
GO
select * from dba_manage_index_defrag –查看结果
b) 根据索引碎片的情况自动选择合适的处理方法
针对Sql Server2000的联机维护：
/*Perform a 'USE ' 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 for.
SELECT @maxfrag = 30.0;
-- Declare a cursor.
DECLARE tables CURSOR FOR
SELECT TABLE_SCHEMA+'.'+TABLE_NAME --MSDN上面直接使用TABLE_NAME，如果SCHEMA不是DBO就会出错
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 the cursor for the 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
针对SQL Server 2000的脱机维护：
sp_msforeachtable @command1="dbcc dbreindex('?','',85)"