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In our recent effort to boost the performance of our Content Management System (CMS) and Content Delivery (CD) pods, we encountered challenges related to slow response times. A significant factor contributing to this issue was SQL index fragmentation. Below, we detail the steps we took to identify and rectify this problem, resulting in a more responsive and streamlined system.

Checking Fragmentation in SQL Indexes:

SQL index fragmentation can significantly impact the performance of Sitecore. To understand and assess the extent of index fragmentation, we referred to a valuable resource at Coates' Blog. The blog discussed the detrimental effects of SQL index fragmentation on Sitecore's performance.

We utilized the following SQL query to identify and assess index fragmentation:
 

-- SQL Query to Check Index Fragmentation
SELECT OBJECT_NAME(ind.OBJECT_ID) AS TableName,
       ind.name AS IndexName,
       indexstats.index_type_desc AS IndexType,
       indexstats.avg_fragmentation_in_percent,
       'ALTER INDEX ' + QUOTENAME(ind.name) + ' ON ' +QUOTENAME(object_name(ind.object_id)) +
       CASE 
           WHEN indexstats.avg_fragmentation_in_percent > 30 THEN ' REBUILD '
           WHEN indexstats.avg_fragmentation_in_percent >= 5 THEN 'REORGANIZE'
           ELSE NULL 
       END as [SQLQuery]
FROM sys.dm_db_index_physical_stats(DB_ID(), NULL, NULL, NULL, NULL) indexstats
INNER JOIN sys.indexes ind ON ind.object_id = indexstats.object_id
AND ind.index_id = indexstats.index_id
WHERE ind.Name IS NOT NULL
ORDER BY indexstats.avg_fragmentation_in_percent DESC

Fixing Fragmentation in Indexes:

Armed with insights from the fragmentation analysis, we implemented a solution to address index fragmentation. The following SQL script demonstrates how we successfully handled index fragmentation:

-- SQL Script to Fix Fragmentation in Indexes
DECLARE @TableName VARCHAR(255)
DECLARE @sql NVARCHAR(500)
DECLARE @fillfactor INT
SET @fillfactor = 80
DECLARE TableCursor CURSOR FOR
SELECT QUOTENAME(OBJECT_SCHEMA_NAME([object_id]))+'.' + QUOTENAME(name) AS TableName
FROM sys.tables
OPEN TableCursor
FETCH NEXT FROM TableCursor INTO @TableName
WHILE @@FETCH_STATUS = 0
BEGIN
    SET @sql = 'ALTER INDEX ALL ON ' + @TableName + ' REBUILD WITH (FILLFACTOR = ' + CONVERT(VARCHAR(3),@fillfactor) + ')'
    EXEC (@sql)
    FETCH NEXT FROM TableCursor INTO @TableName
END
CLOSE TableCursor
DEALLOCATE TableCursor
GO

By addressing SQL index fragmentation, we successfully optimized the performance of our CMS and CD pods, ensuring a faster and more efficient system.

Keywords:

Sitecore performance, CMS optimization, CD pod, SQL index fragmentation, SQL query, Index fragmentation, Database optimization, Responsive system, Streamlined performance.