You must bind a notebook to an interpreter to fetch data from the database or any data source. A default set of interpreter bindings is available.

1. In the Notebook page, click the notebook for which you want to set the interpreter bindings.
   The notebook opens in edit mode.
2. Click the gear icon at the top panel.
   
   The Settings pane opens listing the interpreter bindings for the notebook.
3. Drag and drop the interpreters to reorder the interpreter bindings. The first interpreter on the list is the default. The order of interpreter bindings is:
   • Low (Default): Provides the least level of resources for in-database operations, typically serial (non-parallel) execution. It supports the maximum number of concurrent in-database operations by multiple users. The interpreter with low priority is listed at the top of the interpreter list, and hence, is the default.
   • Medium: Provides a fixed number of CPUs to execute in-database operations in parallel, where possible. It supports a limited number of concurrent users, typically 1.25 times the number of CPUs allocated to the pluggable database.
   • High: Provides the highest level of CPUs to execute in-database operations in parallel, up to the number of CPUs allocated to the pluggable database. It offers the highest performance, but supports the minimum number of concurrent in-database operations, typically 3.
   This is the initial binding order of the interpreters. You can change the order of the interpreter bindings.
4. Click Save.