we are trying to upgrade SGA on 12.1 DB on Linux but unfortunately after the SGA upgrade ,we could not bring up the database and got the below error.
ORA-27137: unable to allocate
Large Pages to create a shared memory segment
ERROR:
Failed to allocate shared
global region with large pages, unix errno = 1.
Aborting Instance
startup.
ORA-27137: unable to allocate
Large Pages to create a shared memory segment
ACTION:
1. Check the permission to
access system large pages.
2. Large pages are automatically
locked into physical memory.
Increase the per process memlock
(soft) limit to at least 14 GB to lock
cause:
we noticed that huge-pages enabled on the server and we need to adjust huge pages related parameter to accommodate new SGA memory.
Solution:
1)check and update limits.conf hard/soft values based on new SGA values
2)VM.NR-huge-pages values derive from oracle provided script.
pitfalls,
we cant use AMM
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