Looker LookML Developer Practice Test

The persistence of a Persistent Derived Table (PDT) indeed affects its availability across different Looker environments. When a PDT is defined with the persistence option, it determines how long the data is kept and where it's stored. This has a direct impact on accessibility. If the PDT is set to persist, it means that the data can be reused in queries without needing to be re-computed every time, and can be shared across different environments like development, staging, and production. Furthermore, if a PDT is not persisted or is dropped, it will not be available in other environments, as each environment maintains its own state of data. This distinction is crucial for managing data flows and ensuring that reports remain accurate and consistent across different development stages. Thus, understanding the persistence of PDTs is essential for effective data modeling and governance in Looker.