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https://issues.apache.org/jira/browse/DERBY-1996?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Knut Anders Hatlen updated DERBY-1996:
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Issue & fix info: [Repro attached]
Bug behavior facts: [Performance]
Issue Type: Improvement (was: Bug)
Triaged for 10.5.2.
> DatabaseMetaData.getColumns() takes long time to return columns for a
> particular schema of Apache JDO TCK
> ---------------------------------------------------------------------------------------------------------
>
> Key: DERBY-1996
> URL: https://issues.apache.org/jira/browse/DERBY-1996
> Project: Derby
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 10.2.1.6
> Reporter: Andy Jefferson
> Attachments: testcase.zip
>
>
> 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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