On 11/2/16 2:02 PM, Gionatan Danti wrote:
However, backup continue to fail with "invalid page header in block" message. Morever, I am very near the xid wraparound limit and, as vacuum fails due to the invalid blocks, I expect a database shutdown (triggered by the 1M transaction protection) within some days.
That means at least some of the Postgres files have been damaged (possibly due to the failing disk). Postgres will complain when it sees internal data structures that don't make sense, but it has no way to know if any of the user data has been screwed up.
From my understanding, both problem *should* be solved enabling "zero_damaged_pages" and executing a "vacuumdb -a". Is this expectation correct? Will a "reindexdb -a" necessary?
I wouldn't trust the existing cluster that far. Since it sounds like you have no better options, you could use zero_damaged_pages to allow a pg_dumpall to complete, but you're going to end up with missing data. So what I'd suggest would be:
stop Postgres make a copy of the cluster start with zero_damaged_pages pg_dumpall stop and remove the cluster (make sure you've got that backup) create a new cluster and load the dump -- Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX Experts in Analytics, Data Architecture and PostgreSQL Data in Trouble? Get it in Treble! http://BlueTreble.com 855-TREBLE2 (855-873-2532) mobile: 512-569-9461 -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
