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Posted to derby-dev@db.apache.org by "Mike Matrigali (JIRA)" <ji...@apache.org> on 2007/05/29 20:01:17 UTC
[jira] Created: (DERBY-2721) improve performance of index lookups
of string types in territory based collated databases.
improve performance of index lookups of string types in territory based collated databases.
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Key: DERBY-2721
URL: https://issues.apache.org/jira/browse/DERBY-2721
Project: Derby
Issue Type: Improvement
Components: SQL, Store
Affects Versions: 10.3.0.0
Reporter: Mike Matrigali
Priority: Minor
Comparison of strings in a non unicode basic collation database is going to be slower than comparing unicode values directly. Indexes perform
many such compares before finding a single key in a search.
Some suggestions for future work:
o Somehow cache CollationKey's for the strings and use them directly for compares rather than the actual strings.
o even better would be to use a functional index that actually stored CollationKey's rather than the strings themselves, and then build the index on the
CollationKeys. Depends on some sort of functional index work. Something like DERBY-455 would build the infrastructure to make this kind of
index easy.
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