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Previously multi-byte aware truncation was done on every pgstat_report_activity() call - proving to be a bottleneck for workloads with long query strings that execute quickly. Instead move the truncation to the read side, which commonly is executed far less frequently. That's possible because all server encodings allow to determine the length of a multi-byte string from the first byte. Rename PgBackendStatus.st_activity to st_activity_raw so existing extension users of the field break - their code has to be adjusted to use pgstat_clip_activity(). Author: Andres Freund Tested-By: Khuntal Ghosh Reviewed-By: Robert Haas, Tom Lane Discussion: https://postgr.es/m/20170912071948.pa7igbpkkkviecpz@alap3.anarazel.de |
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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/.