Postgres Pro
Downloads
Home   >   mailing lists

Thread: PostgreSQL 9.0b1 - Error when checking table sizes

PostgreSQL 9.0b1 - Error when checking table sizes

From
Thom Brown
Date:
This probably isn't a legitimate bug, but as a precaution....

I'm running the following command against PostgreSQL 9.0 beta 1:

psql -U postgres -d test -c "select tablename,
pg_size_pretty(pg_table_size(tablename::regclass)) from pg_tables
order by tablename;"

And getting the following message:

ERROR:  relation "sql_sizing" does not exist

It doesn't matter which database name I use.  It doesn't have a
problem getting database sizes though.  This is under Gentoo Linux x64
with 2.6.32 kernel.

I'm certain I've successfully listed table sizes in the database a
couple days ago.

Thanks

Thom

Re: PostgreSQL 9.0b1 - Error when checking table sizes

From
Peter Eisentraut
Date:
On tor, 2010-05-27 at 22:41 +0100, Thom Brown wrote:
> This probably isn't a legitimate bug, but as a precaution....
>
> I'm running the following command against PostgreSQL 9.0 beta 1:
>
> psql -U postgres -d test -c "select tablename,
> pg_size_pretty(pg_table_size(tablename::regclass)) from pg_tables
> order by tablename;"
>
> And getting the following message:
>
> ERROR:  relation "sql_sizing" does not exist

This can be reduced to

select 'sql_sizing'::regclass;
ERROR:  relation "sql_sizing" does not exist

You need a schema qualification (it's in information_schema).

Re: PostgreSQL 9.0b1 - Error when checking table sizes

From
Tom Lane
Date:
Thom Brown <thombrown@gmail.com> writes:
> This probably isn't a legitimate bug, but as a precaution....
> I'm running the following command against PostgreSQL 9.0 beta 1:

> psql -U postgres -d test -c "select tablename,
> pg_size_pretty(pg_table_size(tablename::regclass)) from pg_tables
> order by tablename;"

> And getting the following message:

> ERROR:  relation "sql_sizing" does not exist

The "tablename::regclass" bit is guaranteed to fail for any relation
that's not in your current search_path, because you're just handing
an unqualified name to the regclass converter.

If you're absolutely intent on using the pg_tables view here, you
could do this instead:
    (quote_ident(schemaname) || '.' || quote_ident(tablename))::regclass

Frankly though this seems like quite the hard way.  Why not just

select relname, pg_size_pretty(pg_table_size(oid)) from pg_class
where relkind = 'r'
order by relname;

            regards, tom lane

Re: PostgreSQL 9.0b1 - Error when checking table sizes

From
Thom Brown
Date:
On 27 May 2010 23:00, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Thom Brown <thombrown@gmail.com> writes:
>> This probably isn't a legitimate bug, but as a precaution....
>> I'm running the following command against PostgreSQL 9.0 beta 1:
>
>> psql -U postgres -d test -c "select tablename,
>> pg_size_pretty(pg_table_size(tablename::regclass)) from pg_tables
>> order by tablename;"
>
>> And getting the following message:
>
>> ERROR: =A0relation "sql_sizing" does not exist
>
> The "tablename::regclass" bit is guaranteed to fail for any relation
> that's not in your current search_path, because you're just handing
> an unqualified name to the regclass converter.
>
> If you're absolutely intent on using the pg_tables view here, you
> could do this instead:
> =A0 =A0 =A0 =A0(quote_ident(schemaname) || '.' || quote_ident(tablename))=
::regclass
>
> Frankly though this seems like quite the hard way. =A0Why not just
>
> select relname, pg_size_pretty(pg_table_size(oid)) from pg_class
> where relkind =3D 'r'
> order by relname;
>
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0regards, tom lane
>

Of course, you're both right.  I've changed it to:

psql -U postgres -d test -c "select tablename,
pg_size_pretty(pg_table_size(tablename::regclass)) from pg_tables
where schemaname =3D 'public' order by tablename;"

And this, for some reason, works... which is how I did it the other
day (hence why I've only just got the error today).

Apologies

Thom

Re: PostgreSQL 9.0b1 - Error when checking table sizes

From
Stephen Frost
Date:
* Thom Brown (thombrown@gmail.com) wrote:
> psql -U postgres -d test -c "select tablename,
> pg_size_pretty(pg_table_size(tablename::regclass)) from pg_tables
> where schemaname =3D 'public' order by tablename;"
>=20
> And this, for some reason, works... which is how I did it the other
> day (hence why I've only just got the error today).

public is in your search_path by default- that's why it works.  Still,
it's not really a *good* approach.  Use the one that Tom showed.

    Thanks,

        Stephen