Re: PostgreSQL 64 Bit XIDs - Transaction IDs

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Merlin Moncure <mmoncure(at)gmail(dot)com>
Cc: Gerhard Wiesinger <lists(at)wiesinger(dot)com>, pgsql-general(at)postgresql(dot)org
Subject: Re: PostgreSQL 64 Bit XIDs - Transaction IDs
Date: 2012-03-23 18:57:55
Message-ID: 24680.1332529075@sss.pgh.pa.us
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Merlin Moncure <mmoncure(at)gmail(dot)com> writes:
> On Fri, Mar 23, 2012 at 11:35 AM, Gerhard Wiesinger <lists(at)wiesinger(dot)com> wrote:
>> So I think XID overflow should be planned for one of the next PostgreSQL
>> releases.

> two mitigating factors:
> 1. read only transactions do not increment xid counter

Yes. Ask your admin what his throughput of *data modifying*
transactions is. I'll bet that number is a few orders of magnitude
smaller again.

> 2. xid wraparound counter is per table.

That unfortunately isn't so, the XID counter is global to an installation.

regards, tom lane

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