| From: | "Marko Kreen" <markokr(at)gmail(dot)com> |
|---|---|
| To: | alphax <alphax(at)vip(dot)163(dot)com> |
| Cc: | pg-general <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: How to safely compare transaction id? |
| Date: | 2008-01-11 15:25:39 |
| Message-ID: | e51f66da0801110725o391bb0eh7d8c2095381493dc@mail.gmail.com |
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| Lists: | pgsql-general |
On 1/11/08, alphax <alphax(at)vip(dot)163(dot)com> wrote:
> I want to compare the record's transaction id in sql statements or
> PL/pgSQL stored procedure. Are there any system function or operator can
> safely(transaction id wraparound safed) compare the transaction id?
In 8.3 there are txid functions that export 8byte wraparound-safe
transaction id, that can be safely stored in user tables:
http://developer.postgresql.org/pgdocs/postgres/functions-info.html#FUNCTIONS-TXID-SNAPSHOT
For 8.2 and below you can get them as external module from
Skytools package: http://pgfoundry.org/projects/skytools
--
marko
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