| From: | Oliver Jowett <oliver(at)opencloud(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Dave Cramer <pg(at)fastcrypt(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Heikki Linnakangas <hlinnaka(at)iki(dot)fi> |
| Subject: | Re: 2PC transaction id |
| Date: | 2005-07-01 03:56:59 |
| Message-ID: | 42C4BF0B.3000002@opencloud.com |
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| Lists: | pgsql-hackers pgsql-patches |
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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