How to Enable And Configure Logging In PostgreSQL?

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To enable and configure logging in PostgreSQL, you need to modify the configuration file called "postgresql.conf".

  1. Find the "postgresql.conf" file in the data directory of your PostgreSQL installation.
  2. Open the file using a text editor.
  3. Find the section related to logging settings.
  4. Set the "logging_collector" parameter to "on" to enable logging.
  5. Choose the log_destination parameter to specify where the log files should be written, such as stderr, csvlog, syslog, or eventlog.
  6. Set the log_filename parameter to specify the file name pattern for log files.
  7. Adjust other logging parameters like log_rotation_age, log_rotation_size, log_truncate_on_rotation, log_line_prefix, and log_timezone as needed.
  8. Save the changes to the configuration file.
  9. Restart the PostgreSQL server for the changes to take effect.

By following these steps, you can enable and configure logging in PostgreSQL as per your requirements.

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How to enable logging in PostgreSQL?

To enable logging in PostgreSQL, you need to modify the postgresql.conf file. Here is a step-by-step guide to enable logging in PostgreSQL:

  1. Locate the postgresql.conf file: The postgresql.conf file is usually located in the data directory of your PostgreSQL installation. Common locations include /etc/postgresql//main/postgresql.conf or /var/lib/pgsql/data/postgresql.conf.
  2. Open the postgresql.conf file: Use a text editor to open the postgresql.conf file.
  3. Find the logging settings: Look for the section in the postgresql.conf file that contains logging settings. The settings may be commented out with a "#" symbol at the beginning of the line.
  4. Enable logging: Uncomment the lines related to logging by removing the "#" symbol at the beginning of each line. The following settings control logging in PostgreSQL:
  • logging_collector = on: This setting enables the logging collector process that captures log messages and writes them to log files.
  • log_directory = 'pg_log': This setting specifies the directory where log files will be stored. You can choose a different directory if desired.
  • log_filename = 'postgresql-%Y-%m-%d_%H%M%S.log': This setting specifies the naming format for the log files. You can customize the format of the log file names to suit your preferences.
  • log_statement = 'all': This setting specifies the level of detail for logging statements. The "all" value logs all SQL statements.
  1. Save the changes: Once you have made the necessary changes to the logging settings, save the postgresql.conf file.
  2. Restart PostgreSQL: Finally, restart the PostgreSQL server to apply the changes to the logging settings. You can do this by running the following command:
sudo systemctl restart postgresql

After enabling logging in PostgreSQL, the log files will be generated in the specified directory, capturing information about database activity and errors.

What is the role of log_min_duration_statement in PostgreSQL?

log_min_duration_statement is a parameter in PostgreSQL that specifies the minimum duration of a statement that will be logged. Any SQL statement that runs for longer than the specified duration will be logged in the PostgreSQL log file. This parameter helps in identifying slow queries that are impacting the performance of the database, allowing administrators to optimize these queries for better performance. It is helpful in monitoring and troubleshooting query performance issues in PostgreSQL.

What is the role of log_statement in PostgreSQL?

The log_statement parameter in PostgreSQL determines which SQL statements are logged in the PostgreSQL server log. Its purpose is to help with debugging and monitoring of database activity by providing a record of the SQL statements that are being executed.

The possible values for the log_statement parameter are:

  • none: No SQL statements are logged.
  • ddl: Only data definition language (DDL) statements like CREATE, ALTER, DROP, etc. are logged.
  • mod: Only data-modifying statements like INSERT, UPDATE, DELETE, etc. are logged.
  • all: All SQL statements are logged (DDL, DML, and DCL).

By setting the log_statement parameter to an appropriate value, administrators can control the amount of information logged to the server log, making it easier to track and troubleshoot database activity.

What is the function of log_hostname in PostgreSQL?

The log_hostname parameter in PostgreSQL is used to specify whether the hostname of the client sending the log message should be included in the log message. When set to true, the hostname information will be included in the log, providing additional context about where the log message originated from. When set to false, the hostname information will not be included in the log messages. This parameter is useful for tracking and identifying the source of log messages in a multi-client environment.

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