17th September 2020: PostgreSQL 13 RC 1 Released!

Critical Issue with pg_upgrade

Posted on 2011-04-08

The PostgreSQL developers have discovered a bug in all released versions of pg_upgrade and (formerly) pg_migrator. Anyone who has used pg_upgrade or pg_migrator should take corrective actions as soon as possible.

You might also want to make a backup of the pg_clog directory if you do not already have a recent copy. If you fail to take action promptly, it might result in unexpected downtime.

This bug can cause queries to return the following error:

ERROR: could not access status of transaction ######

DETAIL: could not open file "pg_clog/####": No such file or directory=20

This error prevents access to very wide values stored in the database. To prevent such failures users need to follow the instructions on the pg_upgrade fix wiki page as soon as possible.

The PostgreSQL developers apologize for any disruption which this issue may cause.

Full information on the wiki page.

This post has been migrated from a previous version of the PostgreSQL website. We apologise for any formatting issues caused by the migration.