Re: behaviour of ontape

Hi, a normal checkpoint (i.e. not fuzzy checkpoint) is done for the archive. This is then the so-called archive checkpoint. You can later see this data in the "archive root reserved pages" (at the end of output from "oncheck -pr"). "The time the the backup started could reflect the last checkpoint before the backup started." I'm not so sure about this. I thought, that the archive checkpoint is always done. But there may be the case where there was no activity since the last checkpoint and the time the archive is started. In that case an archive checkpoint may not be strictly necessary. If in such a case no explicit archive checkpoint is done for the archive, but the last checkpoint is used instead, then the reference time for the archive would be the time from the last checkpoint That is the only case where I can imagine such a scenario. You probably can test/verify this yourself ... ontape puts the existing log records from the current log onto the tape. Therefore it says it contains that current log. The log does not need to be full, nor will ontape enforce a log switch. This is also information for the user (i.e. administrator) that previous log files (backed up on tape) are no longer needed to restore this (new) level-0 archive. Regards, Martin -- Martin Fuerderer IBM Informix Development Munich, Germany Information Management Informix URLs list: http://home.arcor.de/mfu1/informix/urls.html Informix in the news: http://www.crn.com/sections/software/software.jhtml?articleId=193004835 informix-list-bounces@iiug.org wrote on 16.10.2006 10:48:37: > Hi, > > Thanks for the replies, I'm not there yet though. > > I failed to mention, that I will be doing online backups. Doesn't matter > much though. > > > > http://publib.boulder.ibm.com/infocenter/idshelp/v10/topic/com.ibm.bar.doc/barmst279.htm > > From the info center page: > "For online backups, the data on the backup tape reflects the contents > of the storage spaces at the time the level-0 backup began." > > So it does a full checkpoint, as TBP mentioned? > > And more: > "(The time the backup started could reflect the last checkpoint before > the backup started.)" > > I don't get this one, what does this mean? > > > Anyhow, how can ontape claim that it contains logical log number n, when > n is still being written even after the backup has completed? > > > Alex > _______________________________________________ > Informix-list mailing list > Informix-list@iiug.org > http://www.iiug.org/mailman/listinfo/informix-list