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ORA-27090 - Unable to Reserve Kernel Resources for Asynchronous Disk I/O (Doc ID 579108.1)

Last updated on AUGUST 11, 2020

Applies to:

Oracle Database - Enterprise Edition - Version 10.2.0.4 to 12.2.0.1 [Release 10.2 to 12.2]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud 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
Linux x86-64
Linux x86
***Checked for relevance on 02-Sep-2016***
Oracle Server Enterprise Edition - Version: 10.2.0.4
10.2.0.4
***Checked for relevance on 26-AUG-2014***



Symptoms

You discover messages of this nature in your alert log:

ORA-27090: Message 27090 not found; product=RDBMS; facility=ORA

Additional information: 3
Additional information: 128
Additional information: 65536


- OR -


ORA-27090: UNABLE TO RESERVE KERNEL RESOURCES FOR ASYNCHRONOUS DISK I/O

Additional information: 3
Additional information: 128
Additional information: 65536


- OR -

ORA-27090: Message 27090 not found;  product=RDBMS; facility=ORA
Linux-x86_64 Error: 4: Interrupted system call
Additional information: 3
Additional information: 128
Additional information: 65536



Strace against DBWR shows:

io_setup(4096, 0x66e1588) = -1 EAGAIN (Resource temporarily unavailable),


which is related to "aio-max-nr" kernel limit.

Changes

 

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References

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