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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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39
src/include/pgstat.h
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@ -41,6 +41,16 @@ typedef enum TrackFunctionsLevel
TRACK_FUNC_ALL
} TrackFunctionsLevel;
/* Values to track the cause of session termination */
typedef enum SessionEndType
{
DISCONNECT_NOT_YET, /* still active */
DISCONNECT_NORMAL,
DISCONNECT_CLIENT_EOF,
DISCONNECT_FATAL,
DISCONNECT_KILLED
} SessionEndType;
/* ----------
* The types of backend -> collector messages
* ----------
@ -71,6 +81,7 @@ typedef enum StatMsgType
PGSTAT_MTYPE_DEADLOCK,
PGSTAT_MTYPE_CHECKSUMFAILURE,
PGSTAT_MTYPE_REPLSLOT,
PGSTAT_MTYPE_CONNECTION,
} StatMsgType;
/* ----------
@ -622,6 +633,21 @@ typedef struct PgStat_MsgChecksumFailure
TimestampTz m_failure_time;
} PgStat_MsgChecksumFailure;
/* ----------
* PgStat_MsgConn Sent by the backend to update connection statistics.
* ----------
*/
typedef struct PgStat_MsgConn
{
PgStat_MsgHdr m_hdr;
Oid m_databaseid;
PgStat_Counter m_count;
PgStat_Counter m_session_time;
PgStat_Counter m_active_time;
PgStat_Counter m_idle_in_xact_time;
SessionEndType m_disconnect;
} PgStat_MsgConn;
/* ----------
* PgStat_Msg Union over all possible messages.
@ -654,6 +680,7 @@ typedef union PgStat_Msg
PgStat_MsgTempFile msg_tempfile;
PgStat_MsgChecksumFailure msg_checksumfailure;
PgStat_MsgReplSlot msg_replslot;
PgStat_MsgConn msg_conn;
} PgStat_Msg;
@ -696,6 +723,13 @@ typedef struct PgStat_StatDBEntry
TimestampTz last_checksum_failure;
PgStat_Counter n_block_read_time; /* times in microseconds */
PgStat_Counter n_block_write_time;
PgStat_Counter n_sessions;
PgStat_Counter total_session_time;
PgStat_Counter total_active_time;
PgStat_Counter total_idle_in_xact_time;
PgStat_Counter n_sessions_abandoned;
PgStat_Counter n_sessions_fatal;
PgStat_Counter n_sessions_killed;
TimestampTz stat_reset_timestamp;
TimestampTz stats_timestamp; /* time of db stats file update */
@ -1354,6 +1388,11 @@ extern PgStat_MsgWal WalStats;
extern PgStat_Counter pgStatBlockReadTime;
extern PgStat_Counter pgStatBlockWriteTime;
/*
* Updated by the traffic cop and in errfinish()
*/
extern SessionEndType pgStatSessionEndCause;
/* ----------
* Functions called from postmaster
* ----------