Re: Please HELP - URGENT - transaction wraparound error

Hi Tom

You're not wrong about panicking! This is the worst Sunday I've had in a
while... No sunday lunch or time with the kids... :(

This database supports a (normally 24/7) website and we couldn't
tolerate any possibility of data corruption. I had to make a judgement
call on preventing any/further data loss or corruption, and switching
over to the slave seemed the safest thing to do (based on my ignorance
of the wraparound problem).

I can restore the file system backup of pgsql/data to another database
server and then get the info from pg_database. Or I can import a dump
file from 15 minutes before I re-inited the database...

What exactly am I looking for though?

We don't use OIDs when creating tables...

Could Slon 1.1.0 be causing a problem for us? It must be creating and
deleting bucket loads of records as part of its regular activity...

What am I likely to have missed in my vacuuming? Because whatever I did
wrong is going to break our current live database at some point soon.

Thanks

John



Tom Lane wrote:
> John Sidney-Woollett <johnsw@wardbrook.com> writes:
>
>>I decided to switch over to the slave which is now our live database.
>>the old master with the problem has already been re-inited (although I
>>have a cold backup of the data dir), plus dump files that I can restore
>>from.
>
>
> You panicked much too quickly and destroyed the evidence ... unless by
> "cold backup" you mean a filesystem backup, in which case what you
> should do is restore that and take a look at what's in its pg_database.
> I think there's no question that there is some omission in your vacuuming
> procedures, and you need to find out what it is.
>
>             regards, tom lane