In the context of the
CREATE ACCESS METHOD DDL in PostgreSQL,
CREATE ACCESS METHOD name TYPE access_method_type HANDLER handler_function
What is a a high level description of what an "access method" is and what they are used for?
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CREATE ACCESS METHOD in postgres allows you to define a function to handle (or 'access') a type of index.
It exists to allow you to define new ways for postgres to understand a mapping from the data key values to the actual TID that identifies the related value.
Without an understanding of how relational databases work, it's probably not something you'll ever directly deal with.