hard20 pts · first answer countspostgresqlupgrades

pg_upgrade --link and rollback

You ran pg_upgrade --link to upgrade a 4 TB cluster in minutes and started the new server. Problems appear an hour later. Can you just start the old cluster again?

A.Yes, link mode always keeps the old cluster intactB.No; once the new server has started, the old cluster shares modified data files and is not safe to use, so you need a backup or a standby kept on the old versionC.Yes, but only after running VACUUM FULLD.No, because pg_upgrade deletes the old binaries

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