Oliver Jowett wrote:
> Tom Lane wrote:
>
>>It's the TM's responsibility to deal with that. I would expect it to
>>hand out transaction IDs that consist of a common prefix and a
>>per-database suffix, if it does not know which resources it's dealing
>>with might share a common GID namespace.
> I don't know if we can reasonably expect TMs not to hand out an
> identical XID to different RMs in the same global transaction.
Hm, I suppose we *can* assume that a TM won't hand out the same XID to
the same RM twice (except for the special case of TMJOIN), so we could
append a per-database suffix in the RM itself (e.g. JDBC driver) to
avoid conflicts within a database cluster.
-O
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