Home Forums SQL Server 2005 Administering Problem in avg_page_space_used_in_percent value in fragmentation RE: Problem in avg_page_space_used_in_percent value in fragmentation

  • Hi

    We have a table with a LOB column (varchar(MAX)) which we update to NULL, after a period of time.

    Historical date sensistive archive / operational data... used for tracking and processing.

    Row depth is millions; width is 15 columns (only 1 LOB).

    DBCC SHOWCONTIG scanning 'EmailQueue' table...

    Table: 'EmailQueue' (244195920); index ID: 1, database ID: 32

    TABLE level scan performed.

    - Pages Scanned................................: 3485182

    - Extents Scanned..............................: 437322

    - Extent Switches..............................: 438993

    - Avg. Pages per Extent........................: 8.0

    - Scan Density [Best Count:Actual Count].......: 99.24% [435648:438994]

    - Logical Scan Fragmentation ..................: 0.44%

    - Extent Scan Fragmentation ...................: 2.23%

    - Avg. Bytes Free per Page.....................: 7347.2

    - Avg. Page Density (full).....................: 9.23%

    Tables is huge, but empty...

    5 of the fields are defined as varchar(4000) and as far as I understand, only consume space based on the actual content. Is this impacting the free space? [These are not impacted by the nulling process].

    Essentially, the bulk of the data allocated is allocated to the field that is nulled, but the free space is not allocated to subsequent inserts. It just grows and grows... ideas?