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Starting Redo Apply -"Warning: OS async I/O limit 128 is lower than recovery batch 1024" on standby (Doc ID 741835.1)

Last updated on MARCH 17, 2019

Applies to:

Oracle Database - Enterprise Edition - Version 10.2.0.1 to 11.1.0.8 [Release 10.2 to 11.1]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.
Oracle Server Enterprise Edition - Version: 10.2.0.1 to 11.1.0.8
***Checked for relevance on 26-Sep-2012***


Symptoms

A warning message in Alert log asynchronous I/O limit warning of the form:

"Warning: OS async I/O limit 128 is lower than recovery batch 1024"


may be signaled in the alert log by recovery slave or coordinator processes.This error is because of kernel has not been configured sufficiently for async IO operations.

Operations will still continue but IO operations will not be performed asynchronously which may impact recovery performance and will generate more trace files.

 

NOTE : HP-UX enables Oracle Database to perform I/O to (only) raw disk partitions using an asynchronous method

Cause

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In this Document
Symptoms
Cause
Solution
References

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