sql SQL Server索引操作。

Posted 2021-05-13

--
--	Disabled indexes.
--
select
    sys.objects.name,
    sys.indexes.name
from sys.indexes
    inner join sys.objects on sys.objects.object_id = sys.indexes.object_id
where sys.indexes.is_disabled = 1
order by
    sys.objects.name,
    sys.indexes.name
--
--	The include columns on index.
--
SELECT 
    IndexName = i.Name,
    ColName = c.Name
FROM 
    sys.indexes i
INNER JOIN 
    sys.index_columns ic ON ic.object_id = i.object_id AND ic.index_id = i.index_id
INNER JOIN 
    sys.columns c ON c.object_id = ic.object_id AND c.column_id = ic.column_id
WHERE
    ic.is_included_column = 1
AND i.object_id = OBJECT_ID('whwork')
--
-- Index fragment and statistic
--
-- Statistic	
Declare @tableName VARCHAR(512), @count int, @sql Nvarchar(max)

SET @tableName = 'brnprices'

SET @sql = N'select @count = count(1) from '+ @tableName
exec sp_executesql @sql, N'@count int OUTPUT', @count = @count OUTPUT

SELECT	'Statistic',
	@count	AS TableRowCount,
	1.00 * 100 * sysInx2.rowmodctr / ISNULL(NULLIF(@count, 0), 1),
	100 * (sysInx2.rowmodctr / ISNULL(NULLIF(@count, 0), 1)),
	sysInx2.rowmodctr,
	sysobj.name,
	sysInx2.name,
	*												
FROM	sys.sysindexes sysInx2 WITH (NOLOCK) 
	inner join sys.objects sysObj WITH (NOLOCK)
		on sysInx2.id = sysObj.object_id
WHERE	OBJECT_ID(@tableName)	=  sysInx2.id

--- Index
SELECT	'Index',
	@count	AS TableRowCount,
	OBJECT_NAME(inxStat.object_id)			AS TableName,
	sysInx.name					AS IndexName,
	inxStat.avg_fragmentation_in_percent		AS FragPercent,
	inxStat.avg_fragment_size_in_pages		AS FragSizeInPages,
	inxstat.page_count
FROM	sys.dm_db_index_physical_stats ( DB_ID(), OBJECT_ID(@tableName), NULL, NULL, 'SAMPLED' ) AS inxStat 
	INNER JOIN sys.indexes AS sysInx WITH (NOLOCK)
		ON  inxStat.object_id	= sysInx.object_id
		AND inxStat.index_id	= sysInx.index_id
	INNER JOIN sys.objects AS sysObj WITH (NOLOCK)
		ON  sysInx.object_id	= sysObj.object_id
		AND sysObj.schema_id	= SCHEMA_ID('dbo') 
	WHERE	(inxStat.database_id			= DB_ID() 
	AND    OBJECT_NAME(inxStat.object_id)		= @tableName
	AND	inxStat.index_id			<> 0)
-------- Following criteria are used to deciede if indexes are needed to rebuild --------------------- 
  AND inxStat.page_count   > 500
  AND (inxStat.avg_fragmentation_in_percent > 30 OR 
  inxStat.avg_fragment_size_in_pages < 8)

  --
  -- Rebuild/Disable Indexes
  --
  ALTER INDEX ALL ON purchordlines
	--DISABLE
	REBUILD