Re: Wal -long transaction - Mailing list pgsql-general

From Ian Harding
Subject Re: Wal -long transaction
Date
Msg-id 725602300603200631y10f778cha5fb221a95bd741c@mail.gmail.com
Whole thread Raw
In response to Re: Wal -long transaction  (Ron Mayer <rm_pg@cheapcomplexdevices.com>)
List pgsql-general
>
> And it's been a while; but I thought transactions like that could
> overflow rollback segments in that other database.
>

ORA-01555:    snapshot too old: rollback segment number string with name
"string" too small
Cause:    Rollback records needed by a reader for consistent read are
overwritten by other writers.
Action:    If in Automatic Undo Management mode, increase the setting of
UNDO_RETENTION. Otherwise, use larger rollback segments.

In 10g you can do

ALTER TABLESPACE UNDO_TS2 RETENTION GUARANTEE;

which will automgically grow the undo tablespace until you run out of
disk space or the transaction ends.

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