Description:
It is recommended to set 'skip_show_database' database flag for Cloud SQL Mysql instance to 'on'
Rationale:
'skip_show_database' database flag prevents people from using the SHOW DATABASES statement if they do not have the SHOW DATABASES privilege. This can improve security if you have concerns about users being able to see databases belonging to other users. Its effect depends on the SHOW DATABASES privilege: If the variable value is ON, the SHOW DATABASES statement is permitted only to users who have the SHOW DATABASES privilege, and the statement displays all database names. If the value is OFF, SHOW DATABASES is permitted to all users, but displays the names of only those databases for which the user has the SHOW DATABASES or other privilege. This recommendation is applicable to Mysql database instances.
From Google Cloud Console
From Google Cloud CLI
gcloud sql instances list
gcloud sql instances patch INSTANCE_NAME --database-flags skip_show_database=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 ("=").