auto_explain module provides a means for logging execution plans of slow statements automatically, without having to run
EXPLAIN by hand.
The Greenplum Database
auto_explain module was runs only on the Greenplum Database master segment host. It is otherwise equivalent in functionality to the PostgreSQL
auto_explain module provides no SQL-accessible functions. To use it, simply load it into the server. You can load it into an individual session by entering this command as a superuser:
More typical usage is to preload it into some or all sessions by including
postgresql.conf. Then you can track unexpectedly slow queries no matter when they happen. However, this does introduce overhead for all queries.
See auto_explain in the PostgreSQL documentation for detailed information about the configuration parameters that control this module's behavior.