My Oracle Support Banner

IPC Send Timeout and ORA-12805 with Parallel Execution (Doc ID 1481028.1)

Last updated on FEBRUARY 02, 2022

Applies to:

Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Database - Enterprise Edition - Version and later
Oracle Database Cloud Schema Service - 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.


Please note:   The underlying cause of this error was NOT in the PX code.  It was an RDBMS/VOS bug.  IPC is an internal communication timeout.  PX is the innocent bystander here of an IPC problem.   This note does NOT mean these issues should be routed to the PX team.  Rather, it was written to document the solution of this problem for other analysts.


Intermittent 'IPC Send timeout detected' messages were seen in the alert log, and ORA-12805 was returned to the user session.  No ORA-12805 was recorded in the alert log. 

Example alert log for the 'IPC Send timeout detected' message:





To view full details, sign in with your My Oracle Support account.

Don't have a My Oracle Support account? Click to get started!

In this Document

My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts.