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  1. MariaDB Connector/J
  2. CONJ-35

DatabaseMetaData.getImportedKeys() performance is poor

    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 1.1.2
    • Fix Version/s: 1.1.3
    • Component/s: None
    • Labels:
      None

      Description

      We have experienced performance issues (relative to the MySQL Connector/J) when performing a Hibernate SchemaUpdate on a database with ~300 tables.

      This has been tracked down to the difference in performance of DatabaseMetaData.getImportedKeys() between the two drivers. First with mariadb:

      time java -cp .:/opt/jboss7/modules/org/mariadb/main/mariadb-java-client-1.1.2.jar MariaDBMetadata
      Added tables [327]
      ...
      
      real	2m7.308s
      user	0m0.849s
      sys	0m0.150s
      

      And then with MySQL Connector/J:

      $ time java -cp .:/opt/jboss7/modules/com/mysql/main/mysql-connector-java-5.1.21-bin.jar MariaDBMetadata
      Added tables [327]
      ...
      
      real	0m1.435s
      user	0m1.312s
      sys	0m0.125s
      

      127sec vs 1.5s.

      The attached example code gets the each table defined, and then calls getImportedKeys() on each one in turn.

      Given the performance penalty of querying the information schema, it would probably be quicker to parse the output of 'show create table'.

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            • Assignee:
              wlad Vladislav Vaintroub
              Reporter:
              jellis Jon Ellis
            • Votes:
              1 Vote for this issue
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              3 Start watching this issue

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