My Oracle Support Banner

Solaris Cluster 3.x: Troubleshooting ORA-29740 in a Oracle RAC environment (Doc ID 1018609.1)

Last updated on JUNE 01, 2023

Applies to:

Solaris Cluster - Version 3.1 to 3.3 [Release 3.1 to 3.3]
Oracle Solaris on SPARC (64-bit)
Oracle Solaris on SPARC (32-bit)
Oracle Solaris on x86-64 (64-bit)
Oracle Solaris on x86 (32-bit)


An ORA-29740 error occurs when a member (node) was evicted from the group by another member of the cluster database for one of several possible reasons which may include a communications error within the cluster, failure to issue a heartbeat to the control file, and/or other reasons.

This mechanism is in place to prevent problems from occurring that would affect the entire database. For example, instead of allowing a cluster-wide hang to occur, Oracle will evict the problematic instance(s) from the cluster. When an ORA-29740 error occurs, a surviving instance will remove the problem instance(s) from the cluster. When the problem is detected, the instances 'race' to get a lock on the control file (Results Record lock) for updating. The instance that obtains the lock tallies the votes of the instances to decide membership.

A member may be evicted if:

   a) A communications link is down

   b) There is a split-brain (more than 1 subgroup) and the member is not in the largest subgroup

   c) The member is perceived to be inactive (ie. hung)


Sample message in Alert log of the evicted instance may show: 


Troubleshooting Steps

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

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

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