"Thomas F. O'Connell" <[EMAIL PROTECTED]> writes:
> In the meantime, should I leave the database online while I attempt  
> to recover? It's still unclear to me whether postgres will restart  
> with invalid page headers. I certainly can't run pg_dumpall, for  
> instance.

Has the database successfully checkpointed since the last error
occurrence?  If so, I wouldn't foresee any problem with a shutdown.
If checkpoints are failing then you probably won't be able to shut
down without getting the same error.  (Use pg_controldata if you're
not sure about when the last checkpoint happened.)

> I'm glad that there have so far been only 3 relations affected... :(

You mean, three that you know about :-(

                        regards, tom lane

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