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Two-phase commit is a transaction protocol designed for the complications that arise with distributed resource managers. With a two-phase commit protocol, the distributed transaction manager employs a coordinator to manage the individual resource managers.
The commit process proceeds as
follows:
Phase 1
Each participating resource manager
coordinates local operations and forces all log records out:
If
successful, respond "OK"
If unsuccessful, either allow a
time-out or respond "OOPS"
Phase
2
If all
participants respond "OK":
Coordinator instructs
participating resource managers to "COMMIT"
Participants
complete operation writing the log record for the commit
Otherwise:
Coordinator instructs participating
resource managers to "ROLLBACK"
Participants complete their
respective local undos.
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