How many memory layers are in the Oracle shared pool?

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Oracle shared pools contains two layers:

  1. library cache
  2. data dictionary cache

As of my last knowledge update in January 2022, Oracle Database does not have a concept of “memory layers” in the shared pool. The shared pool in Oracle Database is a component of the System Global Area (SGA) that stores shared SQL and PL/SQL code, as well as data and control structures.

If there have been changes or updates to Oracle Database after January 2022, you may want to refer to the latest Oracle documentation or resources to get the most accurate and up-to-date information. The specific version of Oracle Database you are using may also impact the details of its architecture.