This change also ensures that strftime() does not change errno unless it fails. Make sure the new standby data directories do not exist or are empty. This provides rapid standby upgrades. Update time zone data files to tzdata release 2020d for DST law changes in Fiji, Morocco, Palestine, the Canadian Yukon, Macquarie Island, and Casey Station (Antarctica); plus historical corrections for France, Hungary, Monaco, and Palestine. This is supported by postgres_fdw foreign tables. pg_upgrade will connect to the old and new servers several times, so you might want to set authentication to peer in pg_hba.conf or use a ~/.pgpass file (see Section34.16). If you did not start the new cluster, the old cluster was unmodified except that, when linking started, a .old suffix was appended to $PGDATA/global/pg_control. Each run creates a new subdirectory named with a timestamp formatted as per ISO 8601 (%Y%m%dT%H%M%S), where all its generated files are stored. As side note: are you aware that before Postgres 10, the version numbering was a bit different? If an error occurs while restoring the database schema, pg_upgrade will exit and you will have to revert to the old cluster as outlined in Step 17 below. In PostgreSQL 11: $ psql -d postgres -f schema.sql. That's just cosmetic for our purposes, as we continue to select the fat mode in pre-v13 branches. Compression is already disabled in modern OpenSSL versions, so that the libpq setting had no effect with such libraries. If a future major release ever changes the data storage format in a way that makes the old data format unreadable, pg_upgrade will not be usable for such upgrades. Because optimizer statistics are not transferred by pg_upgrade, you will be instructed to run a command to regenerate that information at the end of the upgrade. You can use pg_upgrade --check to perform only the checks, even if the old server is still running. Prevent extensions from creating custom server parameters that take a quoted list of values (Tom Lane). If the --link option was used, the data files might be shared between the old and new cluster: If pg_upgrade aborted before linking started, the old cluster was unmodified; it can be restarted. Server E.20.3.1.1. In this case, it should be set to at least the number of subscriptions that will be added to the subscriber. This is largely the same problem as just cited for pg_dump et al, although psql's behavior is more complex since the user may intentionally override some connection parameters. Allow the server to specify more complex LDAP specifications in search+bind mode (Thomas Munro). The PostgreSQL Project thanks Etienne Stalmans for reporting this problem. Applications needing to check for a primary key should consult pg_index.
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