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  1. Derby
  2. DERBY-1996

DatabaseMetaData.getColumns() takes long time to return columns for a particular schema of Apache JDO TCK

    Details

    • Type: Improvement
    • Status: Open
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: 10.2.1.6
    • Fix Version/s: None
    • Component/s: SQL
    • Urgency:
      Normal
    • Issue & fix info:
      Repro attached
    • Bug behavior facts:
      Performance

      Description

      When running the Apache JDO "TCK", JPOX needs to query the columns for a particular schema, and so uses DatabaseMetaData.getColumns(null, schemaName, null, null). This takes the order of 3 minutes on a dual-core Pentium 3GHz (with large ram). I've cut the JPOX part down to a stand-alone test (will attach it).

      Thing to note is that with only the schema files d_* installed it takes the order of 20secs. When the schema_* files are also installed then performance goes downhill fast (even though they are in different schemas ... all *.sql file represents a different schema). No point in me postulating what could be the issue since you guys are the Derby experts.

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        1. testcase.zip
          59 kB
          Andy Jefferson

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              • Assignee:
                Unassigned
                Reporter:
                andy Andy Jefferson
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                • Created:
                  Updated: