Mnesia Mastery

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Questions and Answers

What is Mnesia?

  • A distributed, soft real-time database management system written in Erlang (correct)
  • A general-purpose programming language
  • A relational SQL database server
  • An office-based data processing database management system

What is the primary purpose of Mnesia?

  • To provide general office-based data processing
  • To replace SQL-based systems
  • To support Erlang where DBMS-like persistence is required (correct)
  • To act as a standalone programming language

What are the inbuilt table types in Mnesia?

  • in_memory, on_disk, hybrid
  • ram_copies, disc_copies, disc_only_copies (correct)
  • ram_storage, disk_storage, memory_storage
  • primary, secondary, tertiary

What is the storage characteristic of 'ram_copies' in Mnesia?

<p>Data resides in memory and table size is limited by available memory (B)</p> Signup and view all the answers

What is the storage characteristic of 'disc_only_copies' in Mnesia?

<p>Data resides only on disk and is backed by Dets (C)</p> Signup and view all the answers

What is the main objective of the three-level architecture in DBMS?

<p>To enable multiple users to access the same data with personalized views (C)</p> Signup and view all the answers

What is the primary role of the internal level in the three-schema architecture?

<p>Defining the physical storage structure of the database (D)</p> Signup and view all the answers

What is the purpose of mapping in the three-level architecture of DBMS?

<p>To define the correspondence between different levels of the architecture (D)</p> Signup and view all the answers

Where does the external/conceptual mapping lie in the three-schema architecture?

<p>Between the external level and the conceptual level (A)</p> Signup and view all the answers

What is the purpose of the conceptual/internal mapping in the three-schema architecture?

<p>To define the correspondence between the conceptual and internal levels (C)</p> Signup and view all the answers

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