Make Derby self-tune the preallocated ranges for identity columns and sequences.
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                 Key: DERBY-5295
                 URL: https://issues.apache.org/jira/browse/DERBY-5295
             Project: Derby
          Issue Type: Improvement
          Components: SQL
            Reporter: Rick Hillegas


Greater throughput can be achieved by configuring how many values Derby 
preallocates for sequences and identity columns. It may be possible for Derby 
to self-tune the length of these preallocated ranges rather than hardcoding a 
one-size-fits-all length. The logic would go into the SequenceRange class. For 
more discussion of the issues, see DERBY-4437.

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