check-unused-keys: A tool to interact with INDEX_STATISTICS

With the growing adoption of Google’s User Statistics Patch**, the need for supporting scripts has become clear. To that end, we’ve created check-unused-keys, a Perl script to provide a nicer interface than directly querying the INFORMATION_SCHEMA database.

check-unused-keys can be invoked and used as follows:

** FULLTEXT indexes are not taken into account by this patch, so be wary. And, as always, sanity check the suggestions and test thoroughly before making changes to production.

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Comments (10)

  • Arjen Lentz

    into maatkit?

    June 26, 2009 at 3:25 pm
  • Ryan Lowe

    @Arjen someday perhaps:)

    June 26, 2009 at 3:40 pm
  • petitchevalroux

    Does this script work on a standard Mysql installation (without Google’s user_statistics) ?

    June 27, 2009 at 1:21 am
  • Ryan Lowe

    @petitchevalroux No, it does not. It queries the INFORMATION_SCHEMA.INDEX_STATISTICS table, which is only available with the Google patch set.

    June 27, 2009 at 2:29 pm
  • Baron Schwartz

    I’m pretty sure that is only available with the Percona patches. The Google patches added SHOW commands, we turned them into INFORMATION_SCHEMA tables (I might be wrong about that).

    June 28, 2009 at 6:56 am
  • Lance Li

    it looks there is a typo

    # diff check-unused-keys-0.0.2 check-unused-keys-
    my @tbls = split(/,/, $OPTIONS{‘tables’});

    June 28, 2009 at 8:58 pm
  • Lance Li

    sorry for the duplicate comment… it looks i cannot paste a diff result here.

    but i really think you know what i mean… 🙂

    June 28, 2009 at 9:01 pm
  • chava

    tried to use the below check-ununsed-keys but failed.

    # ./check-unused-keys. -uusername -ppassword -Hhostname -iportname -ddbname

    Could not connect to MySQL

    i logged in with the same credentials using mysql -uusername -ppassword -hhostname -Pportname

    any help will be appreciated

    April 23, 2010 at 10:18 am
  • Ryan Lowe

    @chava try with -v -v -v and see the debug output

    April 23, 2010 at 10:22 am
  • chava

    thanks Ryan,

    i used perl check-unused-keys. with options and it worked like a charm, we use perl customized to our environment so. i had to use that instead of ./check-unused-keys .


    April 23, 2010 at 12:42 pm

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