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Sunday, April 22, 2007

StreamCruncher 1.13 Release Candidate is ready!

1) This version includes support for Oracle 10g and has been tested on Oracle Enterprise 10.2.0.

10g being an Enterprise grade Database, requires Tuning by a DB Expert before you start using it as the underlying Database for the StreamCruncher. I don't claim to be an Oracle expert and so I'd ask my DBA to setup the Database for very low Latency, deferred Disk flush, Larger Page and Cache sizes - so that he/she will translate that into the necessary Oracle Configuration changes. People have been creating TableSpaces on RAM Drives mostly to host Indexes for Tables that are constantly modified and heavily contended. I'd also think of creating the whole Database on such a RAM Drive.

StreamCruncher also creates Tables and Indexes for internal purposes. You'll have to ensure that the Schema in which these get created (usually the User name provided in the StreamCruncher DB Config file) are on the TableSpace that is Tuned & Configured for this purpose.

Another good thing to remember to tell the DBA would be the nature in which Events/Rows are operated upon in the Database via StreamCruncher. In any Internal Table, Events are mostly pumped by one Thread and consumed by another Thread - very similar to a Queue or a Conveyor Belt. Updates are done on an Indexed Column mostly on a small set of Rows that are usually in the Page Cache. All DB access (Insert/Update/Delete) by StreamCruncher on its Internal Tables are through Indexes - some Unique and some are not.

Remember, Oracle Database Tuning is an Industry in itself. Make sure you've tuned your setup well!

2) There was another small Concurrency issue in the Kernel that has also been fixed. The last of these kind of issues, hopefully. So, I've finally got rid of the "Unique Index Violation" errors I used to get only on Multi-processor machines. Version 1.12 had it fixed for Single Processor machines. I also have to admit that this fix affects the performance on single Processor machines too, though an increase of only by about 10-13%.