How to find "ready to free, if required" space in UNDO tablespace?
Oracle is currently working on an SR on this topic, while we are diagnosing the problem we are opening up this
question to our user community so they can add perspective to the solution based on their real world experience
According to our understanding with UNDO tablespace, Oracle allocates space in UNDO tablespace based on these two
points.
1) If undo extent is EXPIRED, which we can find in dba_undo_extents.status=EXPIRED.
2) Expire an undo extent above its retention period and NOT ACTIVE, if the active transactions need more undo
space and new extents are not available.
And we are looking for an answer for point 2. How we can find that?
According to our understanding with UNDO tablespace, Oracle allocates space in UNDO tablespace based on these two
points.
1) If undo extent is EXPIRED, which we can find in dba_undo_extents.status=EXPIRED.
2) Expire an undo extent above its retention period and NOT ACTIVE, if the active transactions need more undo
space and new extents are not available.
And we are looking for an answer for point 2. How we can find that?
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