Dear Gurus,
It will be great help if i could get some light on it .
Regards,
Krishna
On Tue, 5 Sept 2023 at 12:13, Krishnaprasad Yadav <chrishna0007@xxxxxxxxx>
wrote:
Dear Gurus,
we see a performance issue and Application team provided session id ,
we tried to figure out the detail and understand that session was executing
one select statement , going further we see that most of the reads activity
happening on UNDO tablespace for select statement , want to understand is
fetching all records from UNDO is normal behavior or i should look for any
rollback too or on which aspect such situation get raised .
File ID % Activity Event % Event
--------------- ---------- ------------------------------ ----------
Tablespace
-----------------------------------------------------
-------------------------
4237 5.30 db file sequential read 3.31
UNDOTBS2
gc cr disk read 1.49
4238 4.97 db file sequential read 2.90
UNDOTBS2
gc cr disk read 1.74
4258 4.06 db file sequential read 2.24
UNDOTBS2
gc cr disk read 1.66
4239 3.73 db file sequential read 2.24
UNDOTBS2
gc cr disk read 1.16
4257 3.48 db file sequential read 2.40
UNDOTBS2
Regards,
Krishna
