Is there a need for setting undo_retention=0?

Hi
If i set my undo_retention to a >0 value, oracle will try his best effort to keep the consistent image for as long as my undo retention value. So, i don;t see why is there a need to let oracle manage the retention for me by setting to 0.
Thanks
Rgds
Ung

Hi,
By setting UNDO_RETENTION to 0, you enable auto tuned retention
As far as I know tuned undo retention is enabled by default. Setting the undo_retention acts as a minimal threshold.
There is a difference in the tuned undo retention value between fixed size undo tablespaces and autoextend enabled tablespaces. From the 10G Release 2 Administrator’s Guide:
If the undo tablespace is
configured with the AUTOEXTEND option, undo retention tuning is slightly different. In
this case, the database tunes the undo retention period to be slightly longer than the
longest-running query on the system at that time.
Undo Retention Tuning and Alert Thresholds For a fixed size undo tablespace, the
database calculates the maximum undo retention period based on database statistics
and on the size of the undo tablespace. For optimal undo management, rather than
tuning based on 100% of the tablespace size, the database tunes the undo retention
period based on 85% of the tablespace size, or on the warning alert threshold
percentage for space used, whichever is lower. (The warning alert threshold defaults to
85%, but can be changed.) Therefore, if you set the warning alert threshold of the undo
tablespace below 85%, this may reduce the tuned length of the undo retention period.
Regards,
Tom
http://oracledba.cz

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26-Nov-2006
06:35 PM
petrib wrote:
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