SQL Server GAM corruption samples

SQL Server Extents, PFS, GAM, SGAM and IAM and related corruptions-2

In previous post, we discussed the PFS, GAM and SGAM pages. Today, I’m going show you two related corruptions on these pages.


SQL Server checks the bit in PFS, GAM, SGAM and IAM are checked when new pages are allocated. It guarantees that it does not store data to a wrong page/extent.

These pages are crucial to SQL Server, SQL Server considers it as a corruption if they are messed up.

I’m going to use the same database I used in previous .


You may restore the backup file and