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

Last updated on AUGUST 26, 2023

Applies to:

Oracle Database Cloud Exadata Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Cloud Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Oracle Database - Standard Edition - Version 12.1.0.2 to 12.1.0.2 [Release 12.1]
Information in this document applies to any platform.

Purpose

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

Scope

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

Details

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In this Document
Purpose
Scope
Details
 Synchronous I/O vs Asynchronous I/O
 Buffered I/O vs Direct I/O
 Direct I/O vs Concurrent I/O
 Recommendations
 Controlling Asynchronous I/O and Direct I/O
 filesystemio_options
 disk_asynch_io
 Platform-specific Notes
 File System–specific Notes
 File System–Platform Matrix for Controlling Direct I/O
 Known Issues
References

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