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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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94
src/backend/utils/adt/pgstatfuncs.c
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@ -1631,6 +1631,100 @@ pg_stat_get_db_blk_write_time(PG_FUNCTION_ARGS)
PG_RETURN_FLOAT8(result);
}
Datum
pg_stat_get_db_session_time(PG_FUNCTION_ARGS)
{
Oid dbid = PG_GETARG_OID(0);
double result = 0.0;
PgStat_StatDBEntry *dbentry;
/* convert counter from microsec to millisec for display */
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) != NULL)
result = ((double) dbentry->total_session_time) / 1000.0;
PG_RETURN_FLOAT8(result);
}
Datum
pg_stat_get_db_active_time(PG_FUNCTION_ARGS)
{
Oid dbid = PG_GETARG_OID(0);
double result = 0.0;
PgStat_StatDBEntry *dbentry;
/* convert counter from microsec to millisec for display */
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) != NULL)
result = ((double) dbentry->total_active_time) / 1000.0;
PG_RETURN_FLOAT8(result);
}
Datum
pg_stat_get_db_idle_in_transaction_time(PG_FUNCTION_ARGS)
{
Oid dbid = PG_GETARG_OID(0);
double result = 0.0;
PgStat_StatDBEntry *dbentry;
/* convert counter from microsec to millisec for display */
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) != NULL)
result = ((double) dbentry->total_idle_in_xact_time) / 1000.0;
PG_RETURN_FLOAT8(result);
}
Datum
pg_stat_get_db_sessions(PG_FUNCTION_ARGS)
{
Oid dbid = PG_GETARG_OID(0);
int64 result = 0;
PgStat_StatDBEntry *dbentry;
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) != NULL)
result = (int64) (dbentry->n_sessions);
PG_RETURN_INT64(result);
}
Datum
pg_stat_get_db_sessions_abandoned(PG_FUNCTION_ARGS)
{
Oid dbid = PG_GETARG_OID(0);
int64 result = 0;
PgStat_StatDBEntry *dbentry;
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) != NULL)
result = (int64) (dbentry->n_sessions_abandoned);
PG_RETURN_INT64(result);
}
Datum
pg_stat_get_db_sessions_fatal(PG_FUNCTION_ARGS)
{
Oid dbid = PG_GETARG_OID(0);
int64 result = 0;
PgStat_StatDBEntry *dbentry;
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) != NULL)
result = (int64) (dbentry->n_sessions_fatal);
PG_RETURN_INT64(result);
}
Datum
pg_stat_get_db_sessions_killed(PG_FUNCTION_ARGS)
{
Oid dbid = PG_GETARG_OID(0);
int64 result = 0;
PgStat_StatDBEntry *dbentry;
if ((dbentry = pgstat_fetch_stat_dbentry(dbid)) != NULL)
result = (int64) (dbentry->n_sessions_killed);
PG_RETURN_INT64(result);
}
Datum
pg_stat_get_bgwriter_timed_checkpoints(PG_FUNCTION_ARGS)
{