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Command line tool for PostgreSQL server activity monitoring.

Project description

pg_activity

Command line tool for PostgreSQL server activity monitoring.

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pg_activity screenshot

Installation from packages (recommended)

pg_activity is available in many Linux distributions; the PostgreSQL Global Development Group (PGDG) also provides packages for RPM-based (https://yum.postgresql.org/) and Debian-based distributions (https://wiki.postgresql.org/wiki/Apt):

$ sudo yum install pg_activity

$ sudo apt install pg-activity

Using distribution packages is the recommended way to install pg_activity.

Installation from pip

Alternatively, pg_activity can be installed using pip on Python 3.7 or later along with psycopg2 (version 2.8 or higher):

$ python3 -m pip install pg_activity psycopg2-binary

In case your $PATH does not already contain it, the full path is:

$ ~/.local/bin/pg_activity

Installation from the git repository

This is only necessary to test development versions. First, clone the repository:

$ git clone https://github.com/dalibo/pg_activity.git

Change the branch if necessary. Then create a dedicated environment, install dependencies and then pg_activity from the repo:

$ cd pg_activity
$ python3 -m venv .venv
$ . .venv/bin/activate
(.venv) $ pip install psycopg2-binary .
(.venv) $ pg_activity

To quit this env and destroy it:

$ deactivate
$ rm -r .venv

Usage

pg_activity works locally or remotely. In local execution context, to obtain sufficient rights to display system information, the system user running pg_activity must be the same user running postgresql server (postgres by default), or have more rights like root. The PostgreSQL user used to connect to the database must be super-user in order to get as much data as possible. Otherwise, pg_activity can fall back to a degraded mode where some data like system information or temporary file data are not displayed.

ex:

sudo -u postgres pg_activity -U postgres

Options

pg_activity [options] [connection string]

Options:
  --blocksize BLOCKSIZE
                        Filesystem blocksize (default: 4096).
  --rds                 Enable support for AWS RDS (implies --no-tempfiles and filters out the rdsadmin database from space calculation).
  --output FILEPATH     Store running queries as CSV.
  --no-db-size          Skip total size of DB.
  --no-tempfiles        Skip tempfile count and size.
  --no-walreceiver      Skip walreceiver checks.
  -w, --wrap-query      Wrap query column instead of truncating.
  --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).
  --filter FIELD:REGEX  Filter activities with a (case insensitive) regular expression applied on selected fields. Known fields are: dbname.
  --debug-file DEBUG_FILE
                        Enable debug and write it to DEBUG_FILE.
  --version             show program's version number and exit.
  --help                Show this help message and exit.

Connection Options:
  connection string     A valid connection string to the database, e.g.: 'host=HOSTNAME port=PORT user=USER dbname=DBNAME'.
  -h HOSTNAME, --host HOSTNAME
                        Database server host or socket directory.
  -p PORT, --port PORT  Database server port.
  -U USERNAME, --username USERNAME
                        Database user name.
  -d DBNAME, --dbname DBNAME
                        Database name to connect to.

Process table display options:
  These options may be used hide some columns from the processes table.

  --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.

Other display options:
  --hide-queries-in-logs
                        Disable log_min_duration_statements and log_min_duration_sample for pg_activity.
  --no-inst-info        Display instance information in header.
  --no-sys-info         Display system information in header.
  --no-proc-info        Display workers process information in header.
  --refresh REFRESH     Refresh rate. Values: 0.5, 1, 2, 3, 4, 5 (default: 2).

Notes

Length of SQL query text that pg_activity reports relies on PostgreSQL parameter track_activity_query_size. Default value is 1024 (expressed in bytes). If your SQL query text look truncated, you should increase track_activity_query_size.

Interactives commands

Key Action
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, indented, truncated
UP/DOWN Scroll processes list
k/j Scroll processes list
q Quit
+ Increase refresh time. Maximum value : 5s
- Decrease refresh time. Minimum Value : 0.5s
F1/1 Running queries list
F2/2 Waiting queries list
F3/3 Blocking queries list
h Help page
R Refresh
D Refresh Database Size (including when --no-dbzise option applied)
s Display system information in header
i Display general instance information in header
o Display worker information in header

Navigation mode

Key Action
UP/k Move up the cursor
DOWN/j Move down the cursor
K Terminate the current backend/tagged backends
C Cancel the current backend/tagged backends
Space Tag or untag the process
q Quit
Other Back to activity

FAQ

I can't see my queries only TPS is shown

pg_activity scans the view pg_stat_activity with a user defined refresh time comprised between 0.5 and 5 seconds. It can be modified in the interface with the + and - keys. Any query executed between two scans won't be displayed.

What is more, pg_activity uses different queries to get :

  • settings from pg_settings
  • version info using version()
  • queries and number of connections from pg_stat_activity
  • locks from pg_locks
  • tps from pg_database using pg_stat_get_db_xact_commit() and pg_stat_get_db_xact_rollback()
  • and more ( eg : pg_cancel_backend() and pg_terminate_backend() )

Those queries cannot be seen in the query tab because all queries issued from the pg_activity backend are considered as noise and are not displayed . On the other hand, the transactions used to get the info for pg_activity's reporting are still accounted for by postgres in pg_stat_get_db_xact_commit() and pg_stat_get_db_xact_commit(). Therefore pg_activity will display a non zero TPS even with no activity on the database, and/or no activity displayed on screen.

How can I specify a password for authentication ?

pg_activity uses libpq to access to PostgreSQL therefore all the traditional methods are available.

You can pass the password for the database connection in a password file. Information can also be given via PostgreSQL's environment variables (PGPASSFILE or PGPASSWORD) or via the connection string parameters.

The password file is preferred since it's more secure (security is deferred to the OS). Please avoid password in connection strings at all cost.

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