Oracle Database Memory Management

 
Memory Architecture (oracle.com)

• Introduction to the Oracle Database Instance
  A database instance is a set of memory structures that manage database files.
• Overview of Checkpoints
  A checkpoint is a crucial mechanism in consistent database shutdowns, instance recovery, and Oracle Database operation generally.
• Overview of Instance Recovery
  Instance recovery is the process of applying records in the online redo log files to data-files to reconstruct changes made after the most recent checkpoint.
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