pg_activity - Man Page

Realtime PostgreSQL database server monitoring tool

Synopsis

pg_activity [option..] [connection string]

Description

Command line tool for PostgreSQL server activity monitoring.

pg_activity must run on the same server as the instance and as the user running the instance (or root) to show CPU, MEM, READ or WRITE columns and other system information.

The Header

The first line of the header displays PostgreSQL's version, the host name, the connection string and the refresh rate.

The rest of the header displays the following information:

- Size: size of the database you are connected to - Growth in B/s;

- Mem.: percentage of memory used - memory used / memory available;

- Swap: percentage of  swap used - swap used / swap available;

- Load: CPU load;

- TPS: transaction per second (sum of commit & rollback for all databases / time elapsed since last snap);

- IO Max: the number of IO per second (aggregated data gathered with the psutil library);

- Read: current Read throughput (aggregated data gathered with the psutil library);

- Write: current Write throughput (aggregated data gathered with the psutil library);

- Active connections: number of active connections;

- Duration mode: query, transaction or backend.

The Running Queries Panel

The running queries panel shows all running queries, transactions or backends  (depending on the DURATION_MODE setting) which have lasted for more than min duration seconds. It displays the following information:

- PID: process id of the backend which executes the query;

- DATABASE: database specified in the connection string;

- APP: application name specified in the connection string;

- USER: user name specified in the connection string;

- CLIENT: client address or “local” in case of linux socker connection;

- CPU%: percentage of CPU used by the backend as reported by the psutil library;

- MEM%: percentage of memory used by the backend as reported by the psutil library;

- READ/s:  read thruput as reported by the psutil library;

- WRITE/s: write thruput as reported by the psutil library;

- TIME: time since the beginning of the query / transaction / backend start depending on the DURATION_MODE currently in use;

- Waiting: for PostgreSQL 9.6+: a specific wait event or nothing. Otherwise, a boolean indicating if we are waiting for a Lock;

- IOW: boolean indicating that the process is waiting for IO as reported by the psutil library;

- state: state of the backend;

- Query: the query.

The Waiting Queries Pannel

The waiting queries view displays queries that are wainting for a lock. It shows the following information:

- PID: process id of the backend which executes the query;

- DATABASE: database specified in the connection string;

- APP: application name specified in the connection string;

- USER: user name specified in the connection string;

- CLIENT: client address or “local” in case of linux socker connection;

- RELATION: the name of the relation being locked if applicable;

- TYPE: the type of lock;

- MODE: the mode of the lock;

- TIME+: the duration of the query, transaction or session depending on the DURATION_MODE setting;

- state: the state of the transaction;

- Query: the query.

The Blocking Queries Pannel

The blocking queries view displays the queries that lock an object which is requiered by another session. It shows following information:

- PID: process id of the backend which executes the query;

- DATABASE: database specified in the connection string;

- APP: application name specified in the connection string;

- USER: user name specified in the connection string;

- CLIENT: client address or “local” in case of linux socker connection;

- RELATION: the name of the relation being locked if applicable;

- TYPE: the type of lock;

- MODE: the mode of the lock;

- TIME+: the duration of the query, transaction or session depending on the DURATION_MODE setting;

- Waiting: for PostgreSQL 9.6+: a specific wait event or nothing. Otherwise, a boolean indicating if we are waiting for a Lock;

- state: the state of the transaction;

- Query: the query.

Command-Line Options

-U USERNAME, --username=USERNAME
        Database user name.
-p PORT, --port=PORT
        Database server port.
-h HOSTNAME, --host=HOSTNAME
        Database server host or socket directory.
-d DBNAME, --dbname=DBNAME
    Database name to connect to.
--blocksize=BLOCKSIZE
        Filesystem blocksize (default: 4096).
--rds
        Enable support for AWS RDS.
--output=FILEPATH
        Store running queries as CSV.
--no-db-size
        Skip total size of DB.
-w DISPLAY_MODE, --query-display-mode=DISPLAY_MODE
        Queries display mode. Values: 1-TRUNCATED, 2-FULL(default), 3-INDENTED
--duration-mode=DURATION_MODE
        Duration mode. Values: 1-QUERY(default), 2-TRANSACTION, 3-BACKEND
--min-duration=SECONDS
        Don't display queries with smaller than specified duration (in seconds).
--help
        Show this help message and exit.
--version
        Show program's version number and exit.

Environment Variables

All the environnement variables supported by libpq (PostgreSQL's query protocol) are supported by pg_activity.

See: https://www.postgresql.org/docs/current/libpq-envars.html

Display Options

--no-pid
        Disable PID.
--no-database
        Disable DATABASE.
--no-user
        Disable USER.
--no-client
        Disable CLIENT.
--no-cpu
        Disable CPU%.
--no-mem
        Disable MEM%.
--no-read
        Disable READ/s.
--no-write
        Disable WRITE/s.
--no-time
        Disable TIME+.
--no-wait
        Disable W.
--no-app-name
        Disable App.

Interactive Commands

r     Sort by READ/s, descending.

w     Sort by WRITE/s, descending.

c     Sort by CPU%, descending.

m     Sort by MEM%, descending.

t     Sort by TIME+, descending.

T     Change duration mode: query, transaction, backend

Space Pause on/off.

v     Change queries display mode: full, truncated, indented

UP / DOWN Scroll process list.

k / j Scroll process list.

q     Quit

+     Increase refresh time. Maximum value: 3s

-     Decrease refresh time. Minimum Value: 1s

F1/1  Running queries monitoring.

F2/2  Waiting queries monitoring.

F3/3  Blocking queries monitoring.

h     Help page.

R     Refresh.

D     Refresh database size.

Examples

PGPASSWORD='mypassword' pg_activity -U pgadmin -h 127.0.0.1 --no-client

pg_activity -h /var/run/postgresql

pg_activity -h myserver -p 5433 -d nagios -U nagios

Info

2021-08-05 pg_activity 2.2.1 Command line tool for PostgreSQL server activity monitoring.