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Posted to derby-dev@db.apache.org by "Kathey Marsden (JIRA)" <ji...@apache.org> on 2013/06/14 00:43:20 UTC
[jira] [Updated] (DERBY-6096) OutOfMemoryError with Clob or Blob
hash join: DataTypeDescriptor.estimatedMemoryUsage() has no case for BLOB
or CLOB so would underestimate memory usage for those types at zero
[ https://issues.apache.org/jira/browse/DERBY-6096?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Kathey Marsden updated DERBY-6096:
----------------------------------
Labels: derby_backport_reject_10_10 (was: )
> OutOfMemoryError with Clob or Blob hash join: DataTypeDescriptor.estimatedMemoryUsage() has no case for BLOB or CLOB so would underestimate memory usage for those types at zero
> ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: DERBY-6096
> URL: https://issues.apache.org/jira/browse/DERBY-6096
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.1.3.1, 10.2.2.0, 10.3.3.0, 10.4.2.0, 10.5.3.0, 10.6.2.1, 10.7.1.1, 10.8.3.0, 10.9.1.0, 10.10.1.1
> Reporter: Kathey Marsden
> Assignee: Kathey Marsden
> Labels: derby_backport_reject_10_10
> Attachments: D6096.java, derby-6096_code_diff.txt, derby-6096_diff2.txt, derby-6096_diff.txt, less-gc.diff, releaseNote.html
>
>
> In discussion on derby-dev regarding how much memory is used for hash joins, Knut noted:
> I haven't verified, but I think HashJoinStrategy uses
> DataTypeDescriptor.estimatedMemoryUsage() to estimate how much memory
> the hash table will consume. That method has no case for BLOB or CLOB,
> so it looks as if it will return zero for LOB columns. If that's so, it
> will definitely overestimate how many rows fits in maxMemoryPerTable
> kilobytes if the rows contain LOBs.
> DataTypeDescriptor.estimatedMemoryUsage() should be updated to include BLOB and CLOB and we should try verify if this theory is correct with a reproduction.
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