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    • Full Table Scans

    1. Welcome to VaultWiki.org, home of the wiki add-on for vBulletin and XenForo!

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    Issue: Full Table Scans

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    1. issueid=283 October 13, 2008 11:41 AM
      pegasus pegasus is offline
      VaultWiki Team
      Full Table Scans
      Need to optimize queries

      A number of queries in VaultWiki result in full MySQL table scans to find the data. We should go through each query and make sure they are optimized.

      So far the Legacy Converter post query had fetched the entire post table, which was not even intended.

      In addition, the Whatlinkshere queries had full table scans of the link and namespace tables, and required a temporary table to be created.

      When updating links in the link table, a full table scan was necessary to find the correct post, because the type required a regex or when it didn't the column wasn't indexed. Avoiding the regex is ideal.

      There was a full table scan of the post table when inserting a template in an article.
    Issue Details
    Issue Number 283
    Issue Type Task
    Project VaultWiki 3.x Series
    Category Unknown
    Status Completed
    Priority 2 - Fatal / Database Errors
    Target Version 2.1.1
    Resolved Version 2.1.2
    Milestone (none)
    Software DependencyAny
    Votes to perform 0
    Votes not to perform 0
    Attachments 0
    Assigned Users (none)
    Tags (none)




    1. October 13, 2008 7:50 PM
      Kaelon Kaelon is offline
      Regular Member
      This definitely describes one of the issues I faced; I sent you a PM with some more detail.
      Reply Reply  
    2. October 16, 2008 11:25 AM
      pegasus pegasus is offline
      VaultWiki Team
      I'm pretty sure there are more table scans if you are running MySQL 4, because of the way it handles using multiple keys. We have always recommended upgrading, but for larger boards this should be considered a requirement.

      In light of these issues, the next build is due out very soon.
      Reply Reply  
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