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Oracle on Windows – Why Is Swap Used With 49 GB Free RAM?

in Database Tuning (MOSC) 2 commentsAnswered

Hi all,

I'm running Oracle Database 12c Standard Edition on Windows Server, and I’m seeing high page faults/sec even though 49 GB of RAM is free.
The system is also very slow during Oracle activity.

Memory Overview

Windows Task Manager:

  • Total RAM: 72 GB
  • Used RAM: 22.4 GB
  • Available RAM: 49.2 GB
  • Swap File Usage: 8 GB

Oracle Parameters:

  • memory_target: 30G
  • sga_target: 23G

SGA Breakdown (from v$sga):

  • Fixed Size: ~2 MB
  • Variable Size: ~17.4 GB
  • Database Buffers: ~10.6 GB
  • Redo Buffers: ~510 MB

Questions:

  • Why is Windows swapping even with so much free RAM?
  • Is this normal with Oracle on Windows?
  • Would using Lock Pages in Memory (LPIM) help reduce this paging?
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