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From "Mike Matrigali (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-1996) DatabaseMetaData.getColumns() takes long time to return columns for a particular schema of Apache JDO TCK
Date Sun, 06 May 2007 21:18:15 GMT

     [ https://issues.apache.org/jira/browse/DERBY-1996?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mike Matrigali updated DERBY-1996:
----------------------------------

    Component/s: SQL

> 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: Bug
>          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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