Enables timing of database I/O calls. This parameter is off by default, as it will repeatedly query the operating system for the current time, which may cause significant overhead on some platforms. You can use the pgtesttiming tool to measure the overhead of timing on your system. I/O timing information is displayed in , in the output of sql-explain when the
BUFFERS option is used, in the output of sql-vacuum when the
VERBOSE option is used, by autovacuum for auto-vacuums and auto-analyzes, when log_autovacuum_min_duration is set and by pgstatstatements. Only superusers and users with the appropriate
SET privilege can change this setting.