The ORA-1555 is a read consistency error. The information from the rollback segments needed to create a read-consistent view of the data is not available. Usually because the information has been overwritten or the extents containing this information have been deallocated (e.g. if optimal is set).
Until 9i, where you can use automatic undo to avoid these errors, the best way is to create dummy transcations in each of the online RBS's before starting the export and leave them uncomitted until the export completes. This will prevent the rollback segments from wrapping around and overwriting the extents that contained uncomitted transactions when the export began. Of course this means you're likely to generate a lot more rollback than usual so you'll need to monitor the space in the RBS tablespaces to avoid getting extent allocation errors. Check Steve Adams' site for a set of scripts to assist you with this: http://www.ixora.com.au Scripts > Rollback Segments HTH, -- Anita --- Jackson Dumas <[EMAIL PROTECTED]> wrote: > > Yeah > > I had a problem recently were I was exporting a > 45Gigg database, the > export will continue until at a end it will come up > with a warning > that export was completed successfully with warnings > because rollback > segment was too old. I increased the tablespace RBS > where the rollback > segments are residing and also created some more > rollback segments. > This did not work also, I had a problem similar to > this but this was > happening when the user was trying to delete some > records with a where > clause, it would come up with the error rollback > segment too old. > Can somebody give me an idea of how to go about this > problem, I would > appreciate you input dearly > > Thank you, > > Mtabaruka !!!!! > _______________________________________________________________ > http://www.webmail.co.za the South-African free > email service > -- > Please see the official ORACLE-L FAQ: > http://www.orafaq.com > -- > Author: Jackson Dumas > INET: [EMAIL PROTECTED] > > Fat City Network Services -- (858) 538-5051 FAX: > (858) 538-5051 > San Diego, California -- Public Internet > access / Mailing Lists > -------------------------------------------------------------------- > To REMOVE yourself from this mailing list, send an > E-Mail message > to: [EMAIL PROTECTED] (note EXACT spelling of > 'ListGuru') and in > the message BODY, include a line containing: UNSUB > ORACLE-L > (or the name of mailing list you want to be removed > from). You may > also send the HELP command for other information > (like subscribing). __________________________________________________ Do You Yahoo!? Find the one for you at Yahoo! Personals http://personals.yahoo.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: A. Bardeen INET: [EMAIL PROTECTED] Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
