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There's long been a "TODO: there might be some value in caching the results" annotation on pg_dump's getFormattedTypeName function; but we hadn't gotten around to checking what it was costing us to repetitively look up type names. It turns out that when dumping the current regression database, about 10% of the total number of queries issued are duplicative format_type() queries. However, Hubert Depesz Lubaczewski reported a not-unusual case where these account for over half of the queries issued by pg_dump. Individually these queries aren't expensive, but when network lag is a factor, they add up to a problem. We can very easily add some caching to getFormattedTypeName to solve it. Since this is such a simple fix and can have a visible performance benefit, back-patch to all supported branches. Discussion: https://postgr.es/m/20210826084430.GA26282@depesz.com |
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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. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.