Improve performance of reading modified Clobs
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Key: DERBY-3934
URL: https://issues.apache.org/jira/browse/DERBY-3934
Project: Derby
Issue Type: Improvement
Components: JDBC
Affects Versions: 10.5.0.0
Reporter: Kristian Waagan
Assignee: Kristian Waagan
The performance of reading modified Clobs is poor, which is demonstrated by
running a test program selecting a 10 MB Clob and then getting the contents
using getSubString:
- unmodified Clob (StoreStreamClob) : ~1 300 ms
- modified Clob (TemporaryClob): ~156 000 ms
In this case, the Clob was modified by changing the first character.
A number of subtasks will be created to handle the various issues, which will
be related to both performance and code cleanup.
For a brief overview, see
http://www.nabble.com/Suggestion-for-improving-ClobUpdatableReader-and-related-code-to20308303.html
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