On 11 January 2013 16:52, Simon Riggs <si...@2ndquadrant.com> wrote: > We already overload the signals, so its just a new type for the signal > handler to cope with. > > See procsignal_sigusr1_handler()
I roughed up something to help you here... this is like 50% of a patch. pg_explain_backend() calls a SIGUSR1 variant which then allows a call to RunDynamicExplain() during any call to CHECK_FOR_INTERRUPTS() That only works when something in the executor has called SetDynamicExplain(), which later needs to be Unset... So that's all you need to invoke a dynamic EXPLAIN via a sysadmin function. All you need to do is generate an EXPLAIN and dump it somewhere useful, like the server log. Over to you Pavel. There's a patch somewhere by Greg Stark that generated a plan from a running server for progress bar stuff, but that was like 5 years ago nearly. But the explain invocation stuff from that might be useful as a guide. -- Simon Riggs http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services
signal_dynamic_explain.v1.patch
Description: Binary data
-- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
