In other words: If you know most of your statements usually execute in under a second you could set log_min_duration_statement to “2s” (which means two seconds) so that whenever a statement takes longer than two seconds it will … log_min_duration_statement (integer) Causes the duration of each completed statement to be logged if the statement ran for at least the specified number of milliseconds. Using built-in default values: There RDSs uses the log_min_duration_statement parameter and I am wondering what should be its default value. After setting log_min_duration_statement to 1000ms I'm sending SIGHUP and see that server resets value to '-1': -bash-4.1$ psql psql (9.3.5) Type "help" for help. The default value is 4,320 (three days). Returns the "default value" for a type. A common way to identify long running queries in PostgreSQL is to set log_min_duration_statement to a value that is known to cause troubles. Allows sampling the duration of completed statements that ran for at least the specified amount of time. This parameter is disabled and set to -1 by default. Once you have some idea of how long a typical query statement should take to execute, this setting allows you to log only the ones that exceed the threshold you set. The default value of the select element can be set by using the ‘selected’ attribute on the required option. The default value is none, and you can modify the values for this parameter as follows: If you set the parameter value to 0, Amazon RDS logs all queries. This is a boolean attribute. All SQL statements that run longer than the parameter setting are logged. Minus-one (the default) disables logging statement durations. Note: The log_min_duration_statement parameter does not depend on or interfere with the log_statement parameter. Enabling this parameter can help you find unoptimized queries. The common objections to setting log_statement to 'all' can be summed up as Disk Space, Performance, and Noise. With this, you'll only see statements that take longer than 1 second to run. This can be extremely handy for finding out the source of outlier statements that take much longer than most to execute. When I create an RDS using the AWS console, there is no value set for this particular parameter (Its shown as an empty null value). # # The commented-out settings shown in this file represent the default values. Of course, if you do set all of those, don’t forget to set log_min_duration_statement = -1 to turn it off completely, as it is no longer needed. The value is in milliseconds, so you might set the following: log_min_duration_statement=1000. Syntax: Example-1: Using the selected attribute. log_min_duration_statement. The log_min_duration_statement parameter sets the limit in milliseconds of a statement to be logged. # Re-commenting a setting is NOT sufficient to revert it to the default value; # you need to reload the server. Step 1 – Open postgresql.conf file in your favorite text editor ( In Ubuntu, postgreaql.conf is available on /etc/postgresql/ ) and update configuration parameter log_min_duration_statement , By default configuration the slow query log is not active, To enable the slow query log on globally, you can change postgresql.conf: Each will … Default values are often some kind of initial value, identity value, or anything else that may make sense as a default. The option that is having the ‘selected’ attribute will be displayed by default on the dropdown list. Examples. Modify the log_statement to control which SQL statements are logged. Setting this to zero prints all statement durations. 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