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From "Naveen Gangam (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-16912) Improve table validator's performance against Oracle
Date Fri, 16 Jun 2017 21:02:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-16912?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16052389#comment-16052389
] 

Naveen Gangam commented on HIVE-16912:
--------------------------------------

Hey [~aihuaxu]
So java.sql.Connection.getSchema() (https://docs.oracle.com/javase/7/docs/api/java/sql/Connection.html#getSchema())
like a good replacement. I had tested it against Derby, Postgres and Oracle and works great.
This API was introduced in JDK7, so using older driver jars will cause an issue.
I am uploading a patch with this fix.

> Improve table validator's performance against Oracle
> ----------------------------------------------------
>
>                 Key: HIVE-16912
>                 URL: https://issues.apache.org/jira/browse/HIVE-16912
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Hive
>    Affects Versions: 3.0.0
>            Reporter: Naveen Gangam
>            Assignee: Naveen Gangam
>            Priority: Minor
>         Attachments: HIVE-16912.patch
>
>
> Currently, this validator uses DatabaseMetaData.getTables() that takes in the order of
minutes to return because of the number of SYSTEM tables present in Oracle.
> Providing a schema name via a system property would limit the number of tables being
returned and thus improve performance.



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