On Fri, Sep 10, 2021 at 2:49 AM Michel SALAIS <msal...@msym.fr> wrote: > > I think that total_time in pg_stat_statements is cpu time + possible waits. > So, can I say that: > > Total_sql_time = total_time + blk_read_time + blk_write_time > > Documentation is not clear at all on that.
In version 12 and below, total_time is the elapsed time between the execution start and stop, so it includes all underlying events. That includes any IO activity, wait events or nested statements (if pg_stat_statemetns.track is set to all). This corresponds to the new total_exec_time field in version 13 and later. > Just to say that for PostgreSQL 13, total_time is replaced by > “total_exec_time + total_plan_time” Indeed, as this version also tracks planning activity.
