rebuilding sys indexes, analyzing sys tables
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  1. #1
    Join Date
    Aug 2000
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    143

    Question

    I have a number of databases that are constantly getting refreshed from imports. Querys on data dictionary tables seem to take forever. I have a feeling it may be due to the ammount of delete and insert activity on the sys tables.

    Is it a bad idea to rebuild the sys indexes and analyze the sys tables from time to time?

  2. #2
    Join Date
    Jun 2000
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    Madrid, Spain
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    yes very bad, you must not do it

  3. #3
    Join Date
    Aug 2000
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    143
    Even though the indexes may be badly fragmented

  4. #4
    Join Date
    Jun 2000
    Location
    Madrid, Spain
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    oh yes, even itīs badly fragmentated I wouldnt do it without caling support first

  5. #5
    Join Date
    Jun 2001
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    Helsinki. Finland
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    If you use CBO, do you analyze after the IMP?


  6. #6
    Join Date
    Aug 2000
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    143
    I normally analyze after the imp, but not the sys tables. Im mostly running queries against the data dictionary to compare it with Erwin models and other development databases, so if anything it would be the sys tables and indexes that the queries are effecting.

    The only other way I can think of to get round this is to recreate the database periodically.

  7. #7
    Join Date
    Jun 2001
    Location
    Helsinki. Finland
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    3,938
    Do you transfer logical models from ERWIN to Designer?

    About SYS' analyze: One sshould never analyze SYS' objects.

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