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While this strategy is ordinarily quite costly because it requires performing two checkpoints, testing shows that it tends to be a faster choice than WAL_LOG during pg_upgrade, presumably because fsync is turned off. Furthermore, we can skip the checkpoints altogether because the problems they are intended to prevent don't apply to pg_upgrade. Instead, we just need to CHECKPOINT once in the new cluster after making any changes to template0 and before restoring the rest of the databases. This ensures that said template0 changes are written out to disk prior to creating the databases via FILE_COPY. Co-authored-by: Matthias van de Meent Reviewed-by: Ranier Vilela, Dilip Kumar, Robert Haas, Michael Paquier Discussion: https://postgr.es/m/Zl9ta3FtgdjizkJ5%40nathan |
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PostgreSQL Database Management System
This directory contains the source code distribution of the PostgreSQL database management system.
PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.