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[[metricbeat-module-postgresql]]
== PostgreSQL module

This module periodically fetches metrics from
https://www.postgresql.org/[PostgreSQL] servers.

Default metricsets are `activity`, `bgwriter` and `database`.


[float]
=== Dashboard

The PostgreSQL module comes with a predefined dashboard showing databse related metrics. For example:

image::./images/metricbeat-postgresql-overview.png[]


[float]
=== Module-specific configuration notes

When configuring the `hosts` option, you must use Postgres URLs of the following
format:

-----------------------------------
[postgres://][user:pass@]host[:port][?options]
-----------------------------------

The URL can be as simple as:

[source,yaml]
----------------------------------------------------------------------
- module: postgresql
  hosts: ["postgres://localhost"]
----------------------------------------------------------------------

Or more complex like:

[source,yaml]
----------------------------------------------------------------------
- module: postgresql
  hosts: ["postgres://localhost:40001?sslmode=disable", "postgres://otherhost:40001"]
----------------------------------------------------------------------

You can also separately specify the username and password using the respective
configuration options. Usernames and passwords specified in the URL take
precedence over those specified in the `username` and `password` config options.

[source,yaml]
----
- module: postgresql
  metricsets: ["status"]
  hosts: ["postgres://localhost:5432"]
  username: root
  password: test
----

[float]
=== Compatibility

This module was tested with PostgreSQL 9.5.3 and is expected to work with all
versions >= 9.


[float]
=== Example configuration

The PostgreSQL module supports the standard configuration options that are described
in <<configuration-metricbeat>>. Here is an example configuration:

[source,yaml]
----
metricbeat.modules:
- module: postgresql
  enabled: true
  metricsets:
    # Stats about every PostgreSQL database
    - database

    # Stats about the background writer process's activity
    - bgwriter

    # Stats about every PostgreSQL process
    - activity

  period: 10s

  # The host must be passed as PostgreSQL URL. Example:
  # postgres://localhost:5432?sslmode=disable
  # The available parameters are documented here:
  # https://godoc.org/github.com/lib/pq#hdr-Connection_String_Parameters
  hosts: ["postgres://localhost:5432"]

  # Username to use when connecting to PostgreSQL. Empty by default.
  #username: user

  # Password to use when connecting to PostgreSQL. Empty by default.
  #password: pass
----

[float]
=== Metricsets

The following metricsets are available:

* <<metricbeat-metricset-postgresql-activity,activity>>

* <<metricbeat-metricset-postgresql-bgwriter,bgwriter>>

* <<metricbeat-metricset-postgresql-database,database>>

* <<metricbeat-metricset-postgresql-statement,statement>>

include::postgresql/activity.asciidoc[]

include::postgresql/bgwriter.asciidoc[]

include::postgresql/database.asciidoc[]

include::postgresql/statement.asciidoc[]

