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The building of command completion tags could often be seen showing up in profiles when running high tps workloads. The query completion tags were being built with snprintf, which is slow at the best of times when compared with more manual ways of formatting strings. Here we introduce BuildQueryCompletionString() to do this job for us. We also now store the completion tag's strlen in the CommandTagBehavior struct so that we can quickly memcpy this number of bytes into the completion tag string. Appending the rows affected is done via pg_ulltoa_n. BuildQueryCompletionString returns the length of the built string. This saves us having to call strlen to figure out how many bytes to pass to pq_putmessage(). Author: David Rowley, Andres Freund Reviewed-by: Andres Freund Discussion: https://postgr.es/m/CAHoyFK-Xwqc-iY52shj0G+8K9FJpse+FuZ36XBKy78wDVnd=Qg@mail.gmail.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/.