> On Fri, Dec 03, 2021 at 10:32:03AM -0500, Tom Lane wrote: > Dilip Kumar <dilipbalaut@xxxxxxxxx> writes: > > On Thu, Dec 2, 2021 at 9:35 AM Dilip Kumar <dilipbalaut@xxxxxxxxx> wrote: > >> I think there is no such view or anything which tells about which > >> backend or transaction has more than 64 sub transaction. But if we > >> are ready to modify the code then we can LOG that information in > >> GetNewTransactionId(), when first time we are marking it overflown. > > > I have prepared a small patch to log this information. > > Putting an elog call into GetNewTransactionId seems like a completely > horrid idea from a performance standpoint. Especially if you put it > inside the XidGenLock hold, where it can block the entire system not just > the one process. But even without that, this seems like a performance > penalty with basically no real-world benefit. People who have issues > like this are not going to want to trawl the postmaster log for such > messages. Maybe it's worth a trace point then, to allow collect such info sort of on demand?
