Jared et al, My understanding could be flawed, but I think that setting 'CONSISTENT=Y' just adds a 'SET TRANSACTION READ ONLY' to the entire export process and thus ensures that all subsequent queries read all tables as of the time the export started. Keep in mind that an export just does a 'select * from <table_after_table_after_table> along with a lot of other DDL generation. This is the reason you can expect ORA-01555 errors when trying to read from a wrapped-around or shrunk rollback segment in the case a read-consistent read is required....
I hope I am making sense here.... John Kanagaraj Oracle Applications DBA DB Soft Inc Work : (408) 970 7002 Listen to great, commercial-free christian music 24x7x365 at http://www.klove.com ** The opinions and facts contained in this message are entirely mine and do not reflect those of my employer or customers ** >-----Original Message----- >From: Jared Still [mailto:[EMAIL PROTECTED]] >Sent: Sunday, September 30, 2001 12:40 AM >To: Multiple recipients of list ORACLE-L >Subject: Re: rollback segments during export > > > >Chris, > >> Just because there is a PK/FK between tables, it does not >mean they will be >> exported in the same transaction. And thus, possibly out of sync. > >I didn't say there was. My implication was that your >tables would get out of sync. Setting 'consistent=y' >won't prevent that: > >: If you specify CONSISTENT=N (the default), each table is >usually exported >: in a single transaction. However, if a table contains nested >tables, th > >Now it *could* be that I'm misreading the docs. It' been known >to happen, but that sentence says to me that each table is >exported as part of a single transaction. > >Anyone have proof to the contrary? The tech writer is being >rather ambigous, at least I think so. > >Jared >-- >Please see the official ORACLE-L FAQ: http://www.orafaq.com >-- >Author: Jared Still > 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). > -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: John Kanagaraj 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).
