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What are the various services provided by the Persistence manager?
Any transparent persistent tool includes a persistence manager API, which usually provides services for:
  * Baxic CRUD operation
  * Query execution
  * Control of transaction
  * Management of the transaction-level cache.
The Persistence manager can be exposed by several different interfaces like Session, Query, Criteria, and Transaction. It provides the following services:
  * Making an object persistent
  * Updating the persistent state of a detached instance.
  * Retrieving a persistent object.
  * Updating a persistent object.
  * Making a persistent object transient.
  * Making a deteched object transient.