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Things To Consider For Setting filesystemio_options And disk_asynch_io (Doc ID 1987437.1)

Last updated on JUNE 04, 2021

Applies to:

Oracle Database - Enterprise Edition - Version and later
Oracle Database Cloud Schema Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Information in this document applies to any platform.


This Document should shed light on the various settings of these two parameters and the impact they can have on database performance.


This Document is intended for database administrators, system admins and technical support


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In this Document
 Synchronous I/O vs Asynchronous I/O
 Buffered I/O vs Direct I/O
 Direct I/O vs Concurrent I/O
 Controlling Asynchronous I/O and Direct I/O
 Platform-specific Notes
 File System–specific Notes
 File System–Platform Matrix for Controlling Direct I/O
 Known Issues

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