Answer / guest

Cause: Either: 1) An attempt was made to bring a rollback
segment online that is unavailable during startup; for
example, the rollback segment is in an offline tablespace.
2) An attempt was made to bring a rollback segment online
that is already online. This is because the rollback segment
is specified twice in the ROLLBACK_SEGMENTS parameter in the
initialization parameter file or the rollback segment is
already online by another instance. 3) An attempt was made
to drop a rollback segment that is currently online. 4) An
attempt was made to alter a rollback segment that is
currently online to use unlimited extents. 5) An attempt was
made to online a rollback segment that is corrupted. This is
because the rollback is specified in
_corrupted_rollback_segments parameter in initialization
parameter file.

Action: Either: 1) Make the rollback segment available; for
example, bring an offline tablespace online. 2) Remove the
name from the ROLLBACK_SEGMENTS parameter if the name is a
duplicate or if another instance has already acquired the
rollback segment. 3) Bring the rollback segment offline
first. This may involve waiting for the active transactions
to finish, or, if the rollback segment needs recovery,
discover which errors are holding up the rolling back of the
transactions and take appropriate actions. 4) Same as 3). 5)
Remove the name from the _corrupted_rollback_segments parameter.

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