On Fri, Aug 31, 2018 at 8:14 AM Adrian Klaver <adrian.klaver@xxxxxxxxxxx> wrote:
On 08/31/2018 08:02 AM, Dave Peticolas wrote:
> Hello, I'm running into the following error running a large query on a
> database restored from WAL replay:
>
> could not access status of transaction 330569126
> DETAIL: Could not open file "pg_clog/0C68": No such file or directory
Postgres version?
Right! Sorry, that original email didn't have a lot of info. This is 9.6.9 restoring a backup from 9.6.8.
Where is the replay coming from?
From a snapshot and WAL files stored in Amazon S3.
>
> Searches of this mailing list seem to indicate this means a database row
> has been corrupted. How would I go about locating the point of
> corruption in order to fix?
To me it looks like what it says, the transaction file could not be
found. From Postgres 9.6 --> 10 pg_clog became pg_xact.
Are you sure you are not working across versions?
I am sure, they are all 9.6.
If not do pg_clog/ and 0C68 actually exist?
pg_clog definitely exists, but 0C68 does not. I think I have subsequently found the precise row in the specific table that seems to be the problem. Specifically I can select * from TABLE where id = BADID - 1 or id = BADID + 1 and the query returns. I get the error if I select the row with the bad ID.
Now what I'm not sure of is how to fix.
