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Date: 2011may25 Updated: 2013jan16 OS: Linux Keywords: postgresql, postgres Q. Postgresql does not keep understand databases from previous versions. How can I upgrade PostgreSQL and keep my data? A. Before upgrading:cd ~postgres pg_dump database1 > database1.sql (for all databases)(you really should have other backups)mv /var/lib/pgsql/data /var/lib/pgsql/data.old... upgrade ... To restore your data after the upgrade:cd ~postgres createdb database1 (for all databases) pg_restore -d database1 database1.sqlThen in file /var/lib/pgsql/data/pg_hba.conf I like to change "ident sameuser" to "trust"# Strict local all all ident sameuser# Slack local all all trustTo start the service:postgresql-setup initdb (You have multiple backups, right!)Or on older systems:service postgresql initdb (You have multiple backups, right!) systemctl start postgresqlOr on older systems:service postgresql startI wish you didn't have to do all this. Mysql will read previous versions of the binary data.
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