Thread: change of table name - any help

On Wed, 17 Sep 2003, chakkara rangarajan wrote:

> Hi All,
>
> We have a development server running
>
> OS - Linux, 2.4.20-openmosix-r4
>
> DB - postgresql 7.3
>
>
>
> We have a table ctcert_name under postgres DB(postgres schema and postgres
> user is the owner). Suddenly, this object started missing from the DB (I am
> the only
>
> Person who connects to that server and did not drop/renamed it). When I
> tried to recreate the same table, the system threw me back an error, saying
> that "postgres.ctcert_name" already exists. I am neither able to drop or
> rename the table.
>
>
>
> Can somebody please tell me, what cud have gone wrong and is the error is
> reproduceable? What is the solution for this kind of problem.
>
> Your efforts are greatly appreciated.

Postgresql is known to not work properly under Mosix.  It may someday, but
from what I've read the shared memory / semaphore system is at the heart
of the problem.

Hello Mr.scott,
Thx for the info and kind help. Can you please provide me any useful links
about the nature of the problem.
Rgds
--Ranga


-----Original Message-----
From: scott.marlowe [mailto:scott.marlowe@ihs.com]
Sent: Wednesday, September 17, 2003 10:26 AM
To: chakkara rangarajan
Cc: pgsql-admin@postgresql.org

On Wed, 17 Sep 2003, chakkara rangarajan wrote:

> Hi All,
>
> We have a development server running
>
> OS - Linux, 2.4.20-openmosix-r4
>
> DB - postgresql 7.3
>
>
>
> We have a table ctcert_name under postgres DB(postgres schema and postgres
> user is the owner). Suddenly, this object started missing from the DB (I
am
> the only
>
> Person who connects to that server and did not drop/renamed it). When I
> tried to recreate the same table, the system threw me back an error,
saying
> that "postgres.ctcert_name" already exists. I am neither able to drop or
> rename the table.
>
>
>
> Can somebody please tell me, what cud have gone wrong and is the error is
> reproduceable? What is the solution for this kind of problem.
>
> Your efforts are greatly appreciated.

Postgresql is known to not work properly under Mosix.  It may someday, but
from what I've read the shared memory / semaphore system is at the heart
of the problem.

Well, if you're trying to run postgresql under openmosix, I'd suggest
looking into the archives of the postgresql-general and hackers mailing
list.  note that this isn't a problem that has a fix in sight as far as I
know, i.e. there's a lot of work left to make it a functional solution,
and even the, it might wind up being slower than just running postgresql
on a single reasonably fast server.

If you are currently running your database on a mosix cluster I'd
recommend setting up a single machine and restoring your database to that
box.

As for getting your table back, I'm not so sure what to do.  It sounds
like the pg_ catalogs are having some problems caused by being under
mosix, and you'll have to find someone here more familiar with the inner
workings of postgresql to get a fix.

On Wed, 17 Sep 2003, chakkara rangarajan wrote:

> Hello Mr.scott,
> Thx for the info and kind help. Can you please provide me any useful links
> about the nature of the problem.
> Rgds
> --Ranga
>
>
> -----Original Message-----
> From: scott.marlowe [mailto:scott.marlowe@ihs.com]
> Sent: Wednesday, September 17, 2003 10:26 AM
> To: chakkara rangarajan
> Cc: pgsql-admin@postgresql.org
>
> On Wed, 17 Sep 2003, chakkara rangarajan wrote:
>
> > Hi All,
> >
> > We have a development server running
> >
> > OS - Linux, 2.4.20-openmosix-r4
> >
> > DB - postgresql 7.3
> >
> >
> >
> > We have a table ctcert_name under postgres DB(postgres schema and postgres
> > user is the owner). Suddenly, this object started missing from the DB (I
> am
> > the only
> >
> > Person who connects to that server and did not drop/renamed it). When I
> > tried to recreate the same table, the system threw me back an error,
> saying
> > that "postgres.ctcert_name" already exists. I am neither able to drop or
> > rename the table.
> >
> >
> >
> > Can somebody please tell me, what cud have gone wrong and is the error is
> > reproduceable? What is the solution for this kind of problem.
> >
> > Your efforts are greatly appreciated.
>
> Postgresql is known to not work properly under Mosix.  It may someday, but
> from what I've read the shared memory / semaphore system is at the heart
> of the problem.
>
>

P.s. just to be sure, are you running this under a mosix cluster, or a
single machine?

On Wed, 17 Sep 2003, chakkara rangarajan wrote:

> Hi All,
>
> We have a development server running
>
> OS - Linux, 2.4.20-openmosix-r4
>
> DB - postgresql 7.3
>
>
>
> We have a table ctcert_name under postgres DB(postgres schema and postgres
> user is the owner). Suddenly, this object started missing from the DB (I am
> the only
>
> Person who connects to that server and did not drop/renamed it). When I
> tried to recreate the same table, the system threw me back an error, saying
> that "postgres.ctcert_name" already exists. I am neither able to drop or
> rename the table.
>
>
>
> Can somebody please tell me, what cud have gone wrong and is the error is
> reproduceable? What is the solution for this kind of problem.
>
> Your efforts are greatly appreciated.

Are you running 7.3, or 7.3.4 or something in between?  There are known
data loss issues with 7.3.0 through 7.3.3 that would make it a good idea
to upgrade.

That said, if this isn't a bug in 7.3, there's a good chance you have
either a hard drive with bad blocks or possible bad memory.  You might
wanna do a bad blocks check as well as run memtest86.  Then, reask your
question in -general getting Tom's attention about this problem.  He's one
of the folks who truly understand the underlying catalog system and what
it means when things like this go wrong.