SQL/IndexFragmentation.sql at master · cjfaulkner/SQL · GitHub

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DROP TABLE IF EXISTS #IndexBuild

DECLARE @SQL VARCHAR(MAX)
DECLARE @TableName VARCHAR(255)
DECLARE @SchemaName VARCHAR(255)
DECLARE @IndexName VARCHAR(255)
DECLARE @FragThreshold float = 80 -- To stop rebuilds set this to 110
DECLARE @SchemaFilter VARCHAR(255) = 'ncov_store'
DECLARE @Rebuild BIT = 0

SELECT
	dbschemas.[name] as 'SchemaName',
	dbtables.[name] as 'TableName',
	dbindexes.[name] as 'IndexName',
	dbindexes.type_desc AS 'IndexType',
	indexstats.avg_fragmentation_in_percent,
	indexstats.page_count
INTO #IndexBuild
FROM
	sys.dm_db_index_physical_stats (DB_ID(), NULL, NULL, NULL, NULL) AS indexstats
INNER JOIN
	sys.tables dbtables
ON
	dbtables.[object_id] = indexstats.[object_id]
INNER JOIN
	sys.schemas dbschemas
ON
	dbtables.[schema_id] = dbschemas.[schema_id]
INNER JOIN
	sys.indexes AS dbindexes
ON
	dbindexes.[object_id] = indexstats.[object_id]
AND
	indexstats.index_id = dbindexes.index_id
WHERE
	indexstats.database_id = DB_ID()
AND
	dbschemas.[name] LIKE '%' + ISNULL(@SchemaFilter, '') + '%'
AND
	indexstats.avg_fragmentation_in_percent >= @FragThreshold
ORDER BY
	indexstats.avg_fragmentation_in_percent DESC

SELECT * FROM #IndexBuild
/*
WHILE ((SELECT COUNT(*) FROM #IndexBuild) > 0) AND (@Rebuild = 1)
BEGIN
	SELECT TOP 1
		@TableName = TableName,
		@SchemaName = SchemaName,
		@IndexName = IndexName
	FROM
		#IndexBuild

	SET @SQL = 'ALTER INDEX ' + @IndexName + ' ON ' + @SchemaName + '.' + @TableName + ' REBUILD'

	RAISERROR(@SQL, 0, 0) WITH NOWAIT

	EXEC (@SQL)

	DELETE
	FROM
		#IndexBuild
	WHERE
		TableName = @TableName
	AND
		SchemaName = @SchemaName
	AND
		IndexName = @IndexName
END

-- ALTER TABLE [ncov_store].[FACT_DAY_AGG] REBUILD;
SELECT dbschemas.[name] as 'Schema',
dbtables.[name] as 'Table',
dbindexes.[name] as 'Index',
indexstats.avg_fragmentation_in_percent,
indexstats.page_count
FROM sys.dm_db_index_physical_stats (DB_ID(), NULL, NULL, NULL, NULL) AS indexstats
INNER JOIN sys.tables dbtables on dbtables.[object_id] = indexstats.[object_id]
INNER JOIN sys.schemas dbschemas on dbtables.[schema_id] = dbschemas.[schema_id]
INNER JOIN sys.indexes AS dbindexes ON dbindexes.[object_id] = indexstats.[object_id]
AND indexstats.index_id = dbindexes.index_id
WHERE indexstats.database_id = DB_ID()
AND dbschemas.[name] = 'ncov_store'
AND dbtables.[name] = 'NCOV_LINELIST'
ORDER BY indexstats.avg_fragmentation_in_percent desc
*/
/*
ALTER INDEX IX__Sys_IsCurrent
ON ncov_store.NCOV_LINELIST REBUILD

ALTER INDEX PK_NCOV_LINELIST
ON ncov_store.NCOV_LINELIST REBUILD

ALTER INDEX IX__Sys_BatchID
ON ncov_store.NCOV_LINELIST REBUILD

ALTER INDEX IX__Sys_RowTitle
ON ncov_store.NCOV_LINELIST REBUILD

*/

--UPDATE STATISTICS ncov_store.NCOV_LINELIST