From: | Adam Witney <awitney(at)sgul(dot)ac(dot)uk> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | pgsql-general <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: "invalid page header in block 597621 of relation..."error |
Date: | 2005-11-23 22:13:06 |
Message-ID: | BFAA99F2.529E1%awitney@sgul.ac.uk |
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Lists: | pgsql-general |
On 23/11/05 9:55 pm, "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Adam Witney <awitney(at)sgul(dot)ac(dot)uk> writes:
>> This table is only ever COPY'd to from data files, no updates or deletes, if
>> I could find out which data file this bit comes from I could just reupload
>> that file... Is it possible to tell what the data actually is from the data
>> I sent?
>
> You might try dumping the page with "od -c" instead of "-x" and looking
> to see if there are any recognizable strings. Also try the same on the
> preceding or following pages. Or try dumping what's on the preceding
> and following pages, eg
> select * from tab where ctid = '(597620,1)';
> select * from tab where ctid = '(597620,2)';
> ...
> (run the item number up high enough to be sure you've seen all the live
> rows on the page).
>
> To get the file back in a usable state before you add more data, you'll
> want to zero the bad block out completely, and then do a VACUUM to see
> if there are any other damaged pages.
Aha, the select statements above made it easy to identify the correct file.
Whats the best way to zero the bad block? Could I not just delete that data
and reload it?
Thanks again
Adam
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