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I’m creating a service that has read-only access to the database. I have a query cache and a second level cache enabled (READ_ONLY mode) in Hibernate to speed up the service, as the tables being accessed change rarely.
My question is, if someone goes into the DB and changes the tables manually (i.e. outside of Hibernate), does the cache recognize automatically that it needs to be cleared? Is there a time limit on the cache?
Nope, the cache isn’t going to scan the database for you to magically update itself when the underlying data changes. Changes that do not come through the L2 cache will not appear in it. How long it takes to time out etc. depends on your provider and whatever the default settings are. It looks like the default ehcache.xml is for 2 minutes.