on 12-20-2007 4:11 PM
Hello friends,
I know Ora 1555 error Its "Snap shot too old"
In which case we get this error Could any one explain briefly.
Cheers,
Rahul
Hello , Im very near to this naswer actually but now it is more clear like from my analysis when ever user access some data that image will be stored in UNDOSEGMENT & if another user is trying to access the same DATA It will show snap shot too old.
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Hi Rahul,
You get the ORA-1555 message when you try to access data that someone else is modifying, and Oracle has lost the information that it needs to construct a read-consistent image of that data to present to you. Since you are using Oracle9i's new UNDO tablespace, the ORA-1555 error is an indication that your UNDO_RETENTION parameter is not large enough. You can monitor this by querying the SSOLDERRCNT (Snap Shot Too Old Error Count) column of V$UNDOSTAT. Increase the UNDO_RETENTION parameter and these errors will go away.
I hope it helps you.
Cheers
Deepanshu
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this happens when you are doing a big update and transaction is not committed. it will fill a rollback segment and fail.
to avoid this, ask your programmer to put more commits.
also, to help, convert to PSAPUNDO and make it big.
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