Handling Transaction Operations
Resource managers must handle three transaction operations: commit, rollback, and recovery.
To commit a transaction, a resource manager makes all changes to a transaction's data permanent and visible to other transactions.
To roll back a transaction, a resource manager removes all changes to a transaction's data. The resource manager must restore the data to the state that it was in before the transaction was created.
To recover a transaction, a resource manager restores a transaction's data to a known good state after a system crash or another unexpected event.
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