On Tue, Mar 12, 2024 at 02:10:59PM +0200, Alexander Korotkov wrote:
> I'm going to push this if no objections.
Commit e85662d wrote:
> --- a/src/backend/storage/ipc/procarray.c
> +++ b/src/backend/storage/ipc/procarray.c
> @@ -2740,6 +2741,8 @@ GetRunningTransactionData(void)
> */
> for (index = 0; index < arrayP->numProcs; index++)
> {
> + int pgprocno = arrayP->pgprocnos[index];
> + PGPROC *proc = &allProcs[pgprocno];
> TransactionId xid;
>
> /* Fetch xid just once - see GetNewTransactionId */
> @@ -2760,6 +2763,13 @@ GetRunningTransactionData(void)
> if (TransactionIdPrecedes(xid, oldestRunningXid))
> oldestRunningXid = xid;
>
> + /*
> + * Also, update the oldest running xid within the current database.
> + */
> + if (proc->databaseId == MyDatabaseId &&
> + TransactionIdPrecedes(xid, oldestRunningXid))
> + oldestDatabaseRunningXid = xid;
Shouldn't that be s/oldestRunningXid/oldestDatabaseRunningXid/?
While this isn't a hot path, I likely would test TransactionIdPrecedes()
before fetching pgprocno and PGPROC, to reduce wasted cache misses.
