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Posted to derby-dev@db.apache.org by "Mike Matrigali (JIRA)" <de...@db.apache.org> on 2005/08/17 02:21:55 UTC
[jira] Closed: (DERBY-509) DERBY-132 resolved ? Table not automatically compressed
[ http://issues.apache.org/jira/browse/DERBY-509?page=all ]
Mike Matrigali closed DERBY-509:
--------------------------------
Resolution: Invalid
This is the current expected behavior. Full compress is not done automatically, at
the page level deleted space is reused by subsequent inserts. This test case is
the worst case scenario as only every 3rd or 5th row is deleted. I will file a separate
enhancement to somehow automatically run compress table.
> DERBY-132 resolved ? Table not automatically compressed
> -------------------------------------------------------
>
> Key: DERBY-509
> URL: http://issues.apache.org/jira/browse/DERBY-509
> Project: Derby
> Type: Bug
> Versions: 10.1.1.0
> Environment: JDK 1.4.2, JDK 1.5.0,
> Windows XP
> Reporter: Volker Edelmann
>
> I tried a test-program that repeatedly inserts a bunch of data into 1 table and repeatedly deletes a bunch of data.
> derby.executeSelect("select count(*) c from rclvalues");
> TestQueries.executeBulkInsertAnalyst(derby.getConnection(), 2000000); // insert 2.000.000 rows
> derby.executeDelete("delete from rclvalues where MOD(id, 3) = 0");
> TestQueries.executeBulkInsertAnalyst(derby.getConnection(), 1000000);
> derby.executeDelete("delete from rclvalues where MOD(id, 5) = 0");
> derby.executeSelect("select count(*) c from rclvalues");
> At the end of the operation, the table contains approximately the same number of rows. But the size of the database has grown from
> 581 MB to 1.22 GB. From the description of item DERBY-132, I hoped that Derby does the compression now ( version 10.1.X.X.).
> Did I overlook I still have to use SYSCS_UTIL.SYSCS_COMPRESS_TABLE ?
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