Re: Server does not start when log_statement_stats is set to on

Devrim =?ISO-8859-1?Q?G=DCND=DCZ?= <devrim(at)CommandPrompt(dot)com> writes:
> I'm getting this error when I set lot_statement_stats to on :
> FATAL: invalid value for parameter "log_statement_stats": 1

> Per Alexey (and Alvaro), both log_planner_stats and log_statement_stats
> cannot be turned on at the same time.

Yup:

regression=# set log_planner_stats TO 1;
SET
regression=# set log_statement_stats TO 1;
ERROR: cannot enable "log_statement_stats" when "log_parser_stats", "log_planner_stats", or "log_executor_stats" is true

> Is that documented somewhere,

Yes.

> or can we please improve the error message here -- or is it a bug?

It's not a bug. However, the specific error message only comes out in
interactive-SET cases:

if (source >= PGC_S_INTERACTIVE)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("cannot enable \"log_statement_stats\" when "
"\"log_parser_stats\", \"log_planner_stats\", "
"or \"log_executor_stats\" is true")));

There are a bunch of other GUC assign hooks that behave similarly.
Perhaps it'd be sensible to emit these complaints as LOG messages
when we're dealing with a noninteractive source (ie, the config file)?

regards, tom lane