PostgreSQL server monitoring

Track the performance, availability, and health of your PostgreSQL instances and databases by monitoring the key performance indicators including the connections, the number of backend processes, cache hit ratios, rows fetched/returned, deadlocks, transactions, and locks—and get instant alerts whenever there is a breach.

Once the agent is successfully installed, the PostgreSQL server running in the server will be auto-discovered and added for monitoring.

 Table of contents: 

• Supported versions
• Prerequisites
• Add a PostgreSQL monitor
• Performance metrics
• Threshold configuration
• Reports
• Licensing
• FAQs on PostgreSQL monitoring 
• Related content

Supported versions

• PostgreSQL versions 10.23 and above
• Linux Site24x7 server monitoring agent version 19.4.0

Prerequisites 

You need to create a PostgreSQL user for the Site24x7 agent on each PostgreSQL server. With the following instructions, you can create a user and grant the PostgreSQL user with the permission to log in from the localhost.

CREATE USER <username> WITH ENCRYPTED PASSWORD '<password>'; 

Example:

CREATE USER site24x7 WITH ENCRYPTED PASSWORD 'Monitoring@123';

The Site24x7 agent needs a few privileges to collect the metrics. You need to provide the PostgreSQL user with the following limited privileges:

GRANT EXECUTE ON FUNCTION pg_ls_waldir TO site24x7;

GRANT pg_read_all_stats TO site24x7;

GRANT pg_read_all_settings TO site24x7;

GRANT CONNECT ON DATABASE postgres to site24x7;

GRANT CONNECT ON DATABASE <database_name> to site24x7;

Add a PostgreSQL monitor 

If there are multiple PostgreSQL instances, repeat the above steps for each PostgreSQL instance. After providing the required permissions, you can proceed to add a PostgreSQL Server Monitor using the following steps:

For Linux 

1. Install the Site24x7 Linux server monitoring agent on your Linux server.
2. Site24x7 server monitoring agent automatically discovers PostgreSQL instances in your servers and adds a sample view of PostgreSQL monitor at the Home tab. To start monitoring, follow the instructions below to authenticate Site24x7 to collect metrics.
3. Execute the following command in your terminal to authenticate and configure PostgreSQL monitoring:

sudo /opt/site24x7/monagent/scripts/AgentManager.sh postgres --add_instance

4. Enter your PostgreSQL instance's user credentials, including the host name, the port of the PostgreSQL instance to be monitored, and the username and password previously created for the Site24x7 agent. 

   

   Steps 3 and 4 have to be repeated for every PostreSQL instance in the server. 

5. After logging in to Site24x7, click Database > PostgreSQL on the navigation pane.

6. You will be directed to the monitor page to view the list of the PostgreSQL instances you have added to monitor.

7. Under the PostgreSQL instance, click Databases to view the list of databases in the selected instance.

• The username and the password you provide will be securely encrypted in the agent and will not be stored in any of the Site24x7 databases.

• If you don't want PostgreSQL to be auto-discovered and added for monitoring, toggle the option Auto discover applications on the server option to No in the Settings page (Admin > Server Monitor > Settings).

• By default, ten databases will be auto-discovered in each PostgreSQL instance.

Performance metrics 

Monitoring the key performance metrics of your PostgreSQL instance and your PostgreSQL database is highly crucial. By closely tracking these parameters, you can proactively identify potential bottlenecks, troubleshoot issues, and optimize the overall efficiency of your PostgreSQL environment.

Threshold configuration 

After adding the PostgreSQL monitor to your Site24x7 account, you can add a Threshold and Availability profile to set thresholds and receive alerts when there is a breach.

To set a threshold and availability profile,

1. Select the PostgreSQL monitor, click the hamburger
   
    icon > Edit.
2. In the Edit PostgreSQL page, you will find the Threshold and Availability tab under Configuration Profiles. Click the + icon to add a new threshold profile. Or click the pencil icon to edit a threshold profile.
3. Click Save.

You will receive alerts when a particular threshold is breached and the specific resource will be declared trouble or critical.

Reports 

View the reports of your PostgreSQL databases by clicking Reports > PostgreSQL > report you want to view.

Licensing 

Each PostgreSQL Instance consumes one advanced monitor license and includes monitoring for twenty-five databases. For each additional database, one basic monitor license will be consumed.

FAQs on PostgreSQL monitoring: 

The Site24x7 server monitoring agent never stores your data in the Site24x7 app servers. The username and password are encrypted in the agent for security reasons.

Check out some FAQs on the security aspects of our PostgreSQL server monitoring:

1. Does Site24x7 need write permission to access databases?
   No.
2. What performance data is collected by Site24x7 for monitoring PostgreSQL servers?
   Site24x7 collects data for the performance metrics listed in this document for monitoring PostgreSQL servers.
3. How do you collect performance metrics for PostgreSQL monitoring?
   Performance metrics are collected by connecting to the PostgreSQL server with the user credentials given by the user, which has read-only access.
4. How do you connect with PostgreSQL server?
   Site24x7 connects with the PostgreSQL server with the user credentials given in the terminal console, and collects data.
5. Do you keep the PostgreSQL connection open?
   No. Site24x7 creates a connection to the PostgreSQL server for collecting performance metrics. Once the data collection is complete, the connection created will be closed.
6. Do you store the PostgreSQL user password directly?
   No. Site24x7 encrypts the password given. The username and password are encrypted in the agent for security reasons. They will not be saved or stored in the Site24x7 app servers.

Related content

Database monitoring: MySQL | MSSQL | MySQL NDB Clusters
Server monitoring: Linux | Windows