Logging mechanism in PostgreSQL

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Logging mechanism in PostgreSQL:

Logging is the process of recording events, actions, and error messages in a systematic manner for future analysis and reference.
In PostgreSQL, the logging mechanism helps track various activities like SQL statements executed, connection attempts, query performance, and errors encountered during database operations.
These logs help in understanding database behaviors, identifying potential issues, and making informed decisions to optimize database performance.
Default logging mechanism:
Prior to PostgreSQL version 12, the default logging mechanism was not enabled by default. This meant that when a new PostgreSQL instance was set up, it would not automatically log any information by default. As a result, administrators and developers had to manually configure the logging parameters to enable logging.
Starting from PostgreSQL version 12, a significant change was introduced in the logging mechanism. The default behavior was altered, and a minimal logging mechanism was enabled by default. By utilizing a component known as the “logger” to handle the generation and writing of log messages. The logger is responsible for capturing crucial events and activities within the database and saving them to log files.
Types of logging formats in PostgreSQL:
1. Plain Format (Default)
2. CSV Format
3. Syslog Format
4. Json Format


Enable Logging:

1. Firstly, we should configure the parameters in postgresql.conf file. Run the following command:

Note – Remove hash infront of every parameter.
2. Restart the cluster to apply changes. Run the following command

3. Check the parameters by running the following command

Here, each day a log file will be created with that particular date.
To open log file Run the following command:


Author    : Prudhvi Teja
LinkedIn  : http://linkedin.com/in/prudhvi-teja-nagabhyru-715052224
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Note: Please test scripts in Non Prod before trying in Production.
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