Tom Lane wrote: > Counting individual statements would add overhead (which the OP already > declared unacceptable) and there are some definitional issues too, like > whether to count statements executed within functions. Yeah, the problem seems underspecified. How do you count statements added or removed by rewrite rules? Statements executed to answer RI queries? Do you count the statements issued by clients as part of the startup sequence? The hypothetical "reset session" of a connection pool handler? How do you count 2PC -- when they are executed, or when they are committed? What happens to statements in transactions that are rolled back? What happens to a statement that is executed partially because it failed partway (e.g. because of division by zero)? OTOH ISTM it would be easy to modify Postgres so as to count statements in the stat collector, by turning pgstat_report_activity into a routine that sent a count (presumably always 1) instead of the query string, and then just add the count to a counter on receiving. -- Alvaro Herrera http://www.CommandPrompt.com/ The PostgreSQL Company - Command Prompt, Inc.
