Using pg_upgrade
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Using pg_upgrade?
pg_upgrade is a PostgreSQL utility that facilitates the in-place upgrade of a PostgreSQL database cluster to a new major version. It allows users to upgrade their database without needing to dump and restore the database, significantly reducing downtime. Here are the key steps involved in using pg_upgrade:
Preparation: Before starting the upgrade, ensure both the old and new versions of PostgreSQL are installed. Backup the existing database cluster and ensure no connections are active.
Initialize the New Cluster: Initialize a new PostgreSQL cluster with the target version using
initdb.Run
pg_upgrade: Execute thepg_upgradecommand, specifying the data directories of the old and new clusters, and the paths to the old and newpg_ctlbinaries.Analyze and Optimize: After the upgrade, run the
analyze_new_cluster.shscript generated bypg_upgradeto update optimizer statistics. This step is crucial for performance.Finalize: If everything works correctly, you can start the new cluster and remove the old cluster to free up space.
Free resources to learn Using pg_upgrade
- Official docspg_upgrade
- ArticleExamining Postgres Upgrades with pg_upgrade
- VideoUpgrade PostgreSQL with pg_upgrade
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Using pg_upgrade: common questions
Can I learn Using pg_upgrade in Hindi?
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Is this Using pg_upgrade tutorial for beginners?
It is lesson 81 of 170 in the free PostgreSQL roadmap, in stage 12, SQL Query Patterns / Anti-patterns. If you are new to PostgreSQL, start from stage 1 and come back here in order; if you already know the earlier stages, this lesson stands on its own.