2017-01-04 14:33 GMT+01:00 Fabien COELHO <coe...@cri.ensmp.fr>: > > An alternative is to implement sub (nested) transactions, like Oracle and >> MS SQL Server... but that would be quite some work. >> > > As a complement, a search showed that IBM DB2, cited as a reference by > Pavel, has AUTONOMOUS transactions, which looks pretty much the same thing > as nested transactions. The documentation presents an interesting use > security-related use case: >
I had on my mind autonomous transactions. > > https://www.ibm.com/developerworks/data/library/techarticle/ > dm-0907autonomoustransactions/ > > The idea is that an application must record an attempt to access a data > even if the attempt fails and is rolled-back. > Now we can this feature emulate with dblink, and there are patches in commitfest based on background workers, and emulation will be cheaper. Regards Pavel > > This feature used carefully within an appropriate pattern would allow to > ensure that if the setup transaction fails then the session status is > FALSE. One possible inconsistency which may arise with sub xacts is that > the status may stay FALSE while the setup has succeeded, however this on > the safe side wrt to the security use case. > > -- > Fabien. >
