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From "Dag H. Wanvik (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-4818) Derby is taking a long time to compile SQLs with more than 9 tables for the first time.
Date Fri, 24 Sep 2010 19:48:33 GMT

     [ https://issues.apache.org/jira/browse/DERBY-4818?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Dag H. Wanvik updated DERBY-4818:
---------------------------------

       Summary: Derby is taking a long time to compile SQLs with more than 9 tables for the
first time.  (was: Derby is taking a long time to parse SQLs with more than 9 tables for the
first time.)
    Issue Type: Improvement  (was: Bug)

I slightly modified the title here (parse->compile) and changed from bug to improvement
request, according to Derby's classification scheme.

> Derby is taking a long time to compile SQLs with more than 9 tables for the first time.
> ---------------------------------------------------------------------------------------
>
>                 Key: DERBY-4818
>                 URL: https://issues.apache.org/jira/browse/DERBY-4818
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 10.4.1.3
>         Environment: All OS platforms and all JVM versions on Derby 10.4.1.3
>            Reporter: Trung Tran
>
> I have SQLs with 9 or more tables and it takes a couple of minutes to compile these SQLs
for the first time.  I'm assuming that the optimizer is taking a long time to figure out the
query plan.

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