What is a Read-Only Cache Group?
A read-only cache group enforces a caching behavior in which committed changes on tables in the Oracle database are automatically refreshed to the cache tables in a cache group on the TimesTen database. Using a read-only cache group is suitable for reference data that is heavily accessed by applications.
If a TimesTen database is unavailable for whatever reason, you can still change data within the Oracle database tables that are cached in a read-only cache group. When a TimesTen database returns to operation, changes that were committed on the cached Oracle database tables while the TimesTen database was unavailable are automatically refreshed to the cache tables.
