Types of Pages in SQL Server

Types of Pages in SQL Server

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• Data Page: It holds the data entered by the user but not the data which is of type text, ntext, nvarchar(max), varchar(max), varbinary(max), image and xml data.
• Index: It stores the index entries.
• Text/Image: It stores LOB ( Large Object data) like text, ntext, varchar(max), nvarchar(max),  varbinary(max), image and xml data.
• GAM & SGAM ;They are used for saving information related to the allocation of extents.
• PFS (Page Free Space): Information related to page allocation and unused space available on pages.
• IAM (Index Allocation Map): Information pertaining to extents that are used by a table or index per allocation unit.
• BCM (Bulk Changed Map): Keeps information about the extents changed in a Bulk Operation.
• DCM (Differential Change Map): This is the information of extents that have modified after the last Full BACKUP statement as per allocation unit.