SQL> startup mount ;ORA-27102: out of memory SVR4 Error: 12: Not enough space Additional information: 1671 Additional information: 16106127360 Additional information: 64424509440
The Above error appeared When trying to start Oracle 12c on Solaris 11.3, this is published bug
Bug:20635316 – 12C DATABASE INSTANCE STARTUP FAILS WITH ORA-27102: OUT OF MEMORY
Solaris using something called OSM , Optimized Shared memory You can know more about it here
To avoid this error as workaround just set the parameter
_use_osm=FALSE