While starting DB instance below error coming because of less memory allocated to oracle user at OS level.

 

Solution:

If Oracle DB version is 12.1.0.2 or later use below workaround to resolve the eorror.

1. Upgrade the OS to at least Oracle Solaris 11.1.19.6.0 release (or greater).

OR

2 A workaround that has proven successful is to set the following parameter in the init/spfile and restart the database

_use_osm=FALSE

METALINK – 1987090.1