[tgl@sss.pgh.pa.us: Re: [ADMIN] ClusterDB error message]

Should this info be put into the docs? Or maybe the FAQ? It seems bad to
me to point people at the archives for something like this...

----- Forwarded message from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> -----
CG <cgg007(at)yahoo(dot)com> writes:
> Can anyone surmise what this message is really saying?

> clusterdb: clustering of table "letter" in database "addata" failed: ERROR:
> could not access status of transaction 1696665057
> DETAIL: could not open file "/usr/local/pgsql/data/pg_clog/0652": No such file or directory

This is a corrupt-data problem: the xmin or xmax field of a row header
has been overwritten with garbage. (Very likely, more than that has
been overwritten, but xmin/xmax is usually the first thing looked at
so this is the typical symptom.)

See the PG list archives for prior discussions of how to isolate and get
rid of corrupted rows.

regards, tom lane

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