Skip to main content

Description

The log_min_duration_statement flag defines the minimum amount of execution time of a statement in milliseconds where the total duration of the statement is logged. Ensure that log_min_duration_statement is disabled, i.e., a value of -1 is set.

Rationale​

Logging SQL statements may include sensitive information that should not be recorded in logs. This recommendation is applicable to PostgreSQL database instances.

Impact​

Turning on logging will increase the required storage over time. Mismanaged logs may cause your storage costs to increase. Setting custom flags via command line on certain instances will cause all omitted flags to be reset to defaults. This may cause you to lose custom flags and could result in unforeseen complications or instance restarts. Because of this, it is recommended you apply these flags changes during a period of low usage.

Audit​

From Google Cloud Console​

  1. Go to the Cloud SQL Instances page in the Google Cloud Console by visiting https://console.cloud.google.com/sql/instances.
  2. Select the instance to open its Instance Overview page.
  3. Go to the Configuration card.
  4. Under Database flags, check that the value of log_min_duration_statement flag is set to -1.

From Google Cloud CLI​

  1. Use the below command for every Cloud SQL PostgreSQL database instance to verify the value of log_min_duration_statement is set to -1.

         gcloud sql instances describe <INSTANCE_NAME> --format=json| jq '.settings.databaseFlags[] | select(.name=="log_min_duration_statement")|.value'

In the output, database flags are listed under the settings as the collection databaseFlags.

Default Value​

By default log_min_duration_statement is -1.

References​

  1. https://cloud.google.com/sql/docs/postgres/flags
  2. https://www.postgresql.org/docs/current/runtime-config-logging.html#RUNTIME-CONFIG-LOGGING-WHAT

Additional Information​

WARNING: This patch modifies database flag values, which may require your instance to be restarted. Check the list of supported flags - https://cloud.google.com/sql/docs/postgres/flags - to see if your instance will be restarted when this patch is submitted.

Note: Some database flag settings can affect instance availability or stability and remove the instance from the Cloud SQL SLA. For information about these flags, see Operational Guidelines.

Note: Configuring the above flag does not require restarting the Cloud SQL instance.