| From: | Craig Ringer <craig(at)postnewspapers(dot)com(dot)au> |
|---|---|
| To: | Steve Crawford <scrawford(at)pinpointresearch(dot)com> |
| Cc: | pgsql-general <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: Old-client/new-server...issues? |
| Date: | 2011-06-07 01:08:25 |
| Message-ID: | 4DED7A09.3030809@postnewspapers.com.au |
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| Lists: | pgsql-general |
On 7/06/2011 8:32 AM, Steve Crawford wrote:
> I am working on my final 7.4 -> 9.0 upgrade. Data-type (auto-coalesce
> and foreign-key), query and encoding issues are resolved. Dump/restore
> is tested. But...
>
> I have a few old client systems that are difficult/infeasible to update.
> I know the recommended procedure is to update clients ahead of server
> but what problems am I likely to encounter connecting to a 9.0 server
> from a 7.4 client?
Reliance on implicit casts to/from text in queries may be a problem.
You could also have issues if the clients rely on metadata obtained from
the database - for example, enumerating columns in a table or listing
tables. I know this has been an issue when using older JDBC drivers
against newer servers, and wouldn't be too surprised if similar issues
existed with libpq.
--
Craig Ringer
Tech-related writing at http://soapyfrogs.blogspot.com/
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