Oracle RAC Interview Questions

1. What is RAC cluster?
 
  • RAC cluster is a database with a shared cache architecture that overcomes the limitations of traditional shared nothing and shared disk approaches.
  • It is a key component of Oracle's private cloud architecture.
 
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2. What is Global Services Daemon (GSD)?
 
  • GSD runs on each node and is not an Oracle background process.
  • This process performs administrative tasks, such as startup and shutdown, based on the requests from different clients, such as DBCA and enterprise manager.
 
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3. What is ACFS?
 
  • ACFS provides an Oracle Home shared file system or a general purpose clustered file system on ASM storage.
  • It needs ASM Dynamic Volume Manager (ADVM) to communicate to the operating system.
 
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4. What is rolling upgrade?
 
  • Rolling upgrade refers to the software upgrading while database is still functional without bringing the database down for upgrade.
  • This is the new feature of Oracle 11g.
 
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