Oracle Database Administration from Zero to Hero - Database Memory Concepts (Part 1 of 2)

This video tutorial covers the concepts of database memory, focusing on Oracle's System Global Area (SGA) and Program Global Area (PGA). It explains the components of SGA, such as the shared pool, buffer cache, and redo log buffer, and their roles in optimizing database operations. The tutorial also delves into the PGA, highlighting its importance in managing client sessions. A detailed discussion on the database buffer cache and the Least Recently Used (LRU) mechanism is provided, emphasizing how these elements enhance data retrieval efficiency.

What are the two main areas of Oracle database memory?

• Data Buffer Cache and Redo Log Buffer

• Shared Pool and Large Pool

• Java Pool and Flashback Buffer

• System Global Area and Program Global Area

Which area in the SGA is used to store SQL and PL/SQL code?

• Data Buffer Cache

• Large Pool

• Redo Log Buffer

• Shared Pool

What is the primary function of the Program Global Area (PGA)?

• To store frequently accessed data blocks

• To save redo entries

• To manage memory for each client session

• To execute Java code

How does the database buffer cache optimize IO operations?

• By saving SQL work areas

• By executing Java code

• By using the Least Recently Used list

• By storing data blocks on disk

What is the role of the Least Recently Used (LRU) list in the buffer cache?

• To store redo entries

• To manage client session memory

• To track the frequency of data block access

• To execute PL/SQL code

Which component is responsible for writing dirty blocks to data files?

• Shared Pool

• DB Writer

• Large Pool

• Java Pool

What happens to data blocks in the buffer cache when they are frequently accessed?

• They are marked as unused

• They are moved to the hot end of the LRU list

• They are written to disk immediately

• They are deleted from the buffer cache