SQL Server rebuilding indexes - script - sql

Question

I'm using a script from #Namphibian, but I have some problems there.
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
CREATE TABLE #FragmentedIndexes
(
DatabaseName SYSNAME,
SchemaName SYSNAME,
TableName SYSNAME,
IndexName SYSNAME,
[Fragmentation%] FLOAT
)
INSERT INTO #FragmentedIndexes
SELECT
DB_NAME(DB_ID()) AS DatabaseName,
ss.name AS SchemaName,
OBJECT_NAME (s.object_id) AS TableName,
i.name AS IndexName,
s.avg_fragmentation_in_percent AS [Fragmentation%]
FROM
sys.dm_db_index_physical_stats(db_id(),NULL, NULL, NULL, 'SAMPLED') s
INNER JOIN
sys.indexes i ON s.[object_id] = i.[object_id]
AND s.index_id = i.index_id
INNER JOIN
sys.objects o ON s.object_id = o.object_id
INNER JOIN
sys.schemas ss ON ss.[schema_id] = o.[schema_id]
WHERE
s.database_id = DB_ID()
AND i.index_id != 0
AND s.record_count > 0
AND o.is_ms_shipped = 0
DECLARE #RebuildIndexesSQL NVARCHAR(MAX)
SET #RebuildIndexesSQL = ''
SELECT
#RebuildIndexesSQL = #RebuildIndexesSQL +
CASE
WHEN [Fragmentation%] > 30
THEN CHAR(10) + 'ALTER INDEX ' + QUOTENAME(IndexName) + ' ON '
+ QUOTENAME(SchemaName) + '.'
+ QUOTENAME(TableName) + ' REBUILD;'
WHEN [Fragmentation%] > 10
THEN CHAR(10) + 'ALTER INDEX ' + QUOTENAME(IndexName) + ' ON '
+ QUOTENAME(SchemaName) + '.'
+ QUOTENAME(TableName) + ' REORGANIZE;'
END
FROM #FragmentedIndexes
WHERE [Fragmentation%] > 10
DECLARE #StartOffset INT
DECLARE #Length INT
SET #StartOffset = 0
SET #Length = 4000
WHILE (#StartOffset < LEN(#RebuildIndexesSQL))
BEGIN
PRINT SUBSTRING(#RebuildIndexesSQL, #StartOffset, #Length)
SET #StartOffset = #StartOffset + #Length
END
PRINT SUBSTRING(#RebuildIndexesSQL, #StartOffset, #Length)
EXECUTE sp_executesql #RebuildIndexesSQL
DROP TABLE #FragmentedIndexes
But instead of 'SAMPLED' I'm using 'DETAILED' but still some indexes are not rebuilt. I found a few indexes with the same value of fragmentation over 30% which still wasn't rebuilded or reorganized yet. That script is running every night last 4 days. My problem is I can't use Maintentance plans for this task.
Any ideas please?

Answer 1

According to this answer:
https://dba.stackexchange.com/questions/18372/why-index-rebuild-does-not-reduce-index-fragmentatation
You need to consider the number of page of your index to know if you do a rebuild
I will recommend to change your INSERT INTO SELECT to this
SELECT
DB_NAME(DB_ID()) AS DatabaseName,
ss.name AS SchemaName,
OBJECT_NAME (s.object_id) AS TableName,
i.name AS IndexName,
s.avg_fragmentation_in_percent AS [Fragmentation%],
page_count
FROM
sys.dm_db_index_physical_stats(db_id(),NULL, NULL, NULL, 'DETAILED') s
INNER JOIN
sys.indexes i ON s.[object_id] = i.[object_id]
AND s.index_id = i.index_id
INNER JOIN
sys.objects o ON s.object_id = o.object_id
INNER JOIN
sys.schemas ss ON ss.[schema_id] = o.[schema_id]
WHERE
s.database_id = DB_ID()
AND i.index_id != 0
AND s.record_count > 0
AND o.is_ms_shipped = 0
AND s.avg_fragmentation_in_percent > 0
AND page_count > 1000