How to set Optimizer at database level in greenplum

How can I turn ON optimizer at Database level?
You can set the optimier ON at database level using below command;

ALTER DATABASE databasename SET OPTIMIZER = ON;

Once this is done, kindly do reconnect to Database to see the change.

How do I check if optimizer is set (ON/OFF) in a given database?
You can use the show command as below to check

psql -d databasename -c 'show optimizer'

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