On Thu, 29 Jan 2004, Tom Lane wrote: > "Marc G. Fournier" <[EMAIL PROTECTED]> writes: > > What happens if I abort on the first transaction? If I'm reading this > > right, if Trans2 does the exact same as above, and COMMITs before Trans1 > > Aborts, the value of balance becomes +200 (Trans2 + Trans1) ... but what > > happens when Trans1 ABORTS? Trans2 believes its COMMIT worked, but > > ABORTng Trans1 will rollback to the original value, no? > > If trans2 is the second to get to the row, it will *wait* until trans1 > either commits or aborts, and then use the new or old version of the row > accordingly. The scenario you are thinking of can't happen.
Thank you, that answers it ... so, simplistically, since they are both hitting the same row, there is a pseudo-commit lock on that row by the first transaction ... ---- Marc G. Fournier Hub.Org Networking Services (http://www.hub.org) Email: [EMAIL PROTECTED] Yahoo!: yscrappy ICQ: 7615664 ---------------------------(end of broadcast)--------------------------- TIP 8: explain analyze is your friend
