What is the difference between TimesTen In-Memory Database (or In-Memory Database Cache) and Coherence?
Both TimesTen and Coherence run in the application tier. Both are main-memory based. Coherence is a distributed in-memory object store. It is used to store and retrieve serialized objects using get/put APIs. TimesTen is an in-memory relational database with persistence to disk and standard transaction semantics. It is accessed via SQL. When used as a cache to the Oracle Database, it synchronizes data automatically with the Oracle Database. Distributed caches present a single image to applications with location transparency and distributed concurrency control.
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