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dec10340d5
While poking into initdb's performance, I noticed that this query wasn't being done very intelligently. By forcing it to execute obj_description() for each pg_proc/pg_operator join row, we were essentially setting up a nestloop join to pg_description, which is not a bright query plan when there are hundreds of outer rows. Convert the check for a "deprecated" operator into a NOT EXISTS so that it can be done as a hashed antijoin. On my workstation this reduces the time for this query from ~ 35ms to ~ 10ms. Which is not a huge win, but it adds up over buildfarm runs. In passing, insert forced query breaks (\n\n, in single-user mode) after each SQL-query file that initdb sources, and after some relatively new queries in setup_privileges(). This doesn't make a lot of difference normally, but it will result in briefer, saner error messages if anything goes wrong. |
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| README.git | ||
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/.