Investigate increasing the memory limit that is used to calculate the
sortbuffer size for sorting.
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Key: DERBY-1677
URL: http://issues.apache.org/jira/browse/DERBY-1677
Project: Derby
Issue Type: Improvement
Components: Performance, Store
Affects Versions: 10.1.3.1, 10.1.3.0, 10.1.2.1, 10.1.1.0, 10.0.2.1,
10.0.2.0, 10.2.0.0
Reporter: Sunitha Kambhampati
The sortbuffer is the in memory sort buffer and the size of the sort buffer is
calculated using the default memory limit of 1M if derby.storage.sortBufferMax
is not specified. .
This may not be appropriate for large systems. Investigate if we can up this
value.
see org.apache.derby.impl.store.access.sort.ExternalSortFactory
protected static final int DEFAULT_MEM_USE = 1024*1024; // aim for about 1Meg
The calculations to come up with the initial size for sortbuffer is in
ExternalSortFactory.createSort()
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