Oracle Coherence Technical Architecture

All,
I am currently looking to re-architect a Java based web service project that handles millions of (read-only) transactions a day. We currently return results very quickly (~3 milliseconds per transaction).
We have 12 application servers running IBM Websphere Application Server that hits a 3 node Oracle RAC. Very few database calls are made, however, since important data is held in an in-memory (heap) cache that is currently about 6 GB. The data isn't static, but it is only updated 4 or 5 times a year.
New enhancements are going to push the cache size to around 25 GB. We could get new RAM, but we have run into garbage collection issues with the current heap size.
I am researching new caching implementations, and Oracle Coherence has come up. I have two questions:
1) Do the coherence servers typically sit on the database tier, or the application tier?
2) Does anyone have any performance metrics on local, in-memory cache lookups versus using a distributed caching approach like Coherence?
Thanks,
Jon

Hi Jon,
jon_wilk wrote:
All,
I am currently looking to re-architect a Java based web service project that handles millions of (read-only) transactions a day. We currently return results very quickly (~3 milliseconds per transaction).
We have 12 application servers running IBM Websphere Application Server that hits a 3 node Oracle RAC. Very few database calls are made, however, since important data is held in an in-memory (heap) cache that is currently about 6 GB. The data isn't static, but it is only updated 4 or 5 times a year.
New enhancements are going to push the cache size to around 25 GB. We could get new RAM, but we have run into garbage collection issues with the current heap size.
I am researching new caching implementations, and Oracle Coherence has come up. I have two questions:
1) Do the coherence servers typically sit on the database tier, or the application tier?It is usually considered the part of the application tier, but you can consider it a tier on its own for certain configurations.
2) Does anyone have any performance metrics on local, in-memory cache lookups versus using a distributed caching approach like Coherence?
IMHO, you should measure scenarios relevant to you, not use other people's metrics which likely are not applicable to your environment and requirements anyway. You should write your own tests with data retrieval and data storage implemented for your needs and optimized for Coherence's capabilities.
Best regards,
Robert

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