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Add pg_stat_database counters for sessions and session time

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This add counters for number of sessions, the different kind of session
termination types, and timers for how much time is spent in active vs
idle in a database to pg_stat_database.

Internally this also renames the parameter "force" to disconnect. This
was the only use-case for the parameter before, so repurposing it to
this mroe narrow usecase makes things cleaner than inventing something
new.

Author: Laurenz Albe
Reviewed-By: Magnus Hagander, Soumyadeep Chakraborty, Masahiro Ikeda
Discussion: https://postgr.es/m/b07e1f9953701b90c66ed368656f2aef40cac4fb.camel@cybertec.at
This commit is contained in:
Magnus Hagander
2021-01-17 13:34:09 +01:00
parent 891a1d0bca
commit 960869da08
10 changed files with 405 additions and 6 deletions
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11
src/backend/tcop/postgres.c
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@ -2865,6 +2865,9 @@ die(SIGNAL_ARGS)
ProcDiePending = true;
}
/* for the statistics collector */
pgStatSessionEndCause = DISCONNECT_KILLED;
/* If we're still here, waken anything waiting on the process latch */
SetLatch(MyLatch);
@ -4579,9 +4582,15 @@ PostgresMain(int argc, char *argv[],
* means unexpected loss of frontend connection. Either way,
* perform normal shutdown.
*/
case 'X':
case EOF:
/* for the statistics collector */
pgStatSessionEndCause = DISCONNECT_CLIENT_EOF;
/* FALLTHROUGH */
case 'X':
/*
* Reset whereToSendOutput to prevent ereport from attempting
* to send any more messages to client.