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Finding Forwarded Records SQL Server 2008
From Wiki
HEAP tables and forwarded records are a major and overlooked performance problem.
To check for forwarded records in 2005 and 2008
- SELECT
- OBJECT_NAME(ps.OBJECT_ID) AS TableName,
- i.name AS IndexName,
- ps.index_type_desc,
- ps.page_count,
- ps.avg_fragmentation_in_percent,
- ps.forwarded_record_count
- FROM sys.dm_db_index_physical_stats (DB_ID(), NULL, NULL, NULL, 'DETAILED') AS ps
- INNER JOIN sys.indexes AS i
- ON ps.OBJECT_ID = i.OBJECT_ID
- AND ps.index_id = i.index_id
- WHERE ps.forwarded_record_count > 0
For SQL Server 2008 you can REBUILD the table to fix this.
To test first create a table
- CREATE TABLE tst (ident INT IDENTITY(1,1),col1 CHAR(20) DEFAULT ('1'),col2 CHAR(10));
Then insert some records
- INSERT INTO tst (col2) VALUES ('2')
- GO 100
Then force the table to become 'bloated' or grow causing the rows to move to another page while leaving pointers
- ALTER TABLE tst ALTER COLUMN col1 CHAR(200);
Running the query above using the sys.dm_db_index_physical_stats DMV will show a forwarded_record_count of 70. To fix this you can simply do the following
- ALTER TABLE dbo.tst REBUILD
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