Ensure 'log_duration' database flag for Cloud SQL PostgreSQL instance is set to 'on'

Description:

Enabling the 'log_duration' setting causes the duration of each completed statement to be logged. This does not logs the text of the query and thus behaves different from the 'log_min_duration_statement' flag. This parameter cannot be changed after session start.

Rationale:

Monitoring the time taken to execute the queries can be crucial in identifying any resource hogging queries and assessing the performance of the server. Further steps such as load balancing and use of optimized queries can be taken to ensure the performance and stability of the server. This recommendation is applicable to PostgreSQL database instances.

Using 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 PostgreSQL instance for which you want to enable the database flag.
3. Click 'Edit'.
4. Scroll down to the 'Flags' section.
5. To set a flag that has not been set on the instance before, click 'Add item', choose the flag 'log_duration' from the drop-down menu and set the value as 'on'.
6. Click 'Save' to save your changes.
7. Confirm your changes under 'Flags' on the Overview page.

Using Command Line:

1. List all Cloud SQL database Instances

gcloud sql instances list

2. Configure the 'log_duration' database flag for every Cloud SQL PosgreSQL database instance using the below command.

gcloud sql instances patch INSTANCE_NAME --database-flags log_duration=on

Note: This command will overwrite all database flags previously set. To keep those and add new ones, include the values for all flags you want set on the instance; any flag not specifically included is set to its default value. For flags that do not take a value, specify the flag name followed by an equals sign ("=").
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