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From "Mamta A. Satoor (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-4537) Update on tables with blob columns streams blobs into memory even when the blobs are not updated/accessed.
Date Fri, 05 Feb 2010 03:22:28 GMT
Update on tables with blob columns streams blobs into memory even when the blobs are not updated/accessed.
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                 Key: DERBY-4537
                 URL: https://issues.apache.org/jira/browse/DERBY-4537
             Project: Derby
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 10.6.0.0
            Reporter: Mamta A. Satoor
            Priority: Minor


While investigating DERBY-1482, I wrote a simple program to see the behavior of a simple update
(without any triggers) of a table with blob columns. 

The update is on a non-blob column of a table with blob volumns. 

When this update is made with limited heap memory, Derby runs into OOM error. 

I tried another table similar to earlier table but with no blob column. An update on that
table does not run into OOM when run with same limited heap memory. 

I would have expected the update to pass for table with blob column since we are not referencing/updating
the blob column. But it appears that we might be streaming in blob column even though it is
untouched by the update sql. 

I wonder if working on this jira first will make the work for DERBY-1482 any easier or better
yet, will it make the problem with DERBY-1482 go away? Will attach a reproducible program
for this soon.

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