Fill Factor for performance

  • hi,

    How important (in terms of performance) fill factor is in a

    1- Clustered Index

    a- Unique Values

    b - Non Unique Values

    2- Non Clustered Index

    a- Uniqe values

    b- Non Unique Values

    Also what should be the value for fill factor for all of the above cases.

    Thanks,

    Usman

  • Very important in all cases.

    It should be somewhere between 1 and 100.

    In other words, it depends on your data.

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  • are you experiencing page splits on your server?

    SQL server default is 0 which means the same as 100% (you can alos specify when rebuilding an index which overrides the default), Set the factor too low and your database size will grow and have to perform more reads (as there are more pages).

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