Home Forums SQL Server 2008 SQL Server 2008 Administration Why there is a Limitations on Index size (900 Bytes)? RE: Why there is a Limitations on Index size (900 Bytes)?

  • August 1, 2012 at 7:31 am

    #1520252

    SQL* (8/1/2012)

    GilaMonster (8/1/2012)

    Yes, all pages are 8kb in size.

    Limitation probably to keep the size of the index tree down. Wouldn't make any sense to have 8kb index key, the index tree would be incredibly deep and very inefficient.

    What about the remaining free space? Around 7 Kb of space will be empty or will it contain any information?

    What happens to a data page when you create a row of only 900 bytes? Same thing with an index page.

    SQL doesn't put one row per page, it fills the page with as many rows as possible. In the case of 900 byte rows, fitting 9 rows to the page.

    I think you may want to revise basic index architecture.

    http://www.sqlservercentral.com/articles/Indexing/68439/

    http://www.sqlservercentral.com/articles/Indexing/68563/

    http://www.sqlservercentral.com/articles/Indexing/68636/

    Is the statement is correct that you have provided?

    Err... yes.

    Gail Shaw
    Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
    SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

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