Re: Re: is PG able to handle a >500 GB Database?

currval returns error unless nextval has been called at least once in the
session.

I use <seq>.last_value

Perhaps I'm fooling myself that the latter is doing what I think, but it
seems to work fine and doesn't require an initial call to nextval.

I too thought that OID was always unique.  That is not true?

--rob




----- Original Message -----
From: "Oliver Elphick" <olly@lfix.co.uk>
To: "Florent Guillaume" <efgeor@noos.fr>
Cc: <pgsql-general@postgresql.org>
Sent: Friday, January 19, 2001 5:27 PM
Subject: Re: Re: is PG able to handle a >500 GB Database?


> Florent Guillaume wrote:
>   >> Unless your application logic tries to use OIDs as row identifiers,
>   >> duplicate OIDs in user tables are not a problem.
>   >
>   >Hmmm, that means that the following, which I use, is not strictly
correct :
>   >
>   >create table t1 (recordid SERIAL PRIMARY KEY, val INT4, name TEXT);
>   >... much later ...
>   >insert into t1 (val, name) values (3465, 'blah');
>   >-- PHP application gets $lastoid for this insert
>   >select recordid from t1 where oid = $lastoid;
>   >-- PHP application now hast the recordid that was created.
>   >
>   >Because the last select could return several lines.
>   >
>   >What would be the correct idiom ? Explicitly use nextval ? That pretty
>   >defeats the point of SERIAL, no ?
>
> SELECT currval('t1_recordid_seq');
>
> currval is guaranteed to return the value that the sequence has just put
> into recordid.
>
> --
> Oliver Elphick                                Oliver.Elphick@lfix.co.uk
> Isle of Wight                              http://www.lfix.co.uk/oliver
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>