83a26ba59b
Make _bt_readpage pass down the current scan direction to various utility functions within its pstate variable. Also have _bt_readpage work off of a local copy of scan->ignore_killed_tuples within its per-tuple loop (rather than using scan->ignore_killed_tuples directly). Testing has shown that this significantly benefits large range scans, which are naturally able to take full advantage of the pstate.startikey optimization added by commit8a510275. Running a pgbench script with a "SELECT abalance FROM pgbench_accounts WHERE aid BETWEEN ..." query shows an increase in transaction throughput of over 5%. There also appears to be a small performance benefit when running pgbench's built-in select-only script. Follow-up to commit65d6acbc. Author: Peter Geoghegan <pg@bowt.ie> Reviewed-By: Victor Yegorov <vyegorov@gmail.com> Discussion: https://postgr.es/m/CAH2-WzmwMwcwKFgaf+mYPwiz3iL4AqpXnwtW_O0vqpWPXRom9Q@mail.gmail.com
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/.