There is a security risk associated with allowing external tables to run OS commands or scripts. To deactivate the use of EXECUTE in web and writable external table definitions, set the gp_external_enable_exec server configuration parameter to off in your master postgresql.conf file:

gp_external_enable_exec = off

Note

You must restart the database in order for changes to the gp_external_enable_exec server configuration parameter to take effect.

Parent topic: Defining a Command-Based Writable External Web Table