ora-27102 out of memory linux error

After setting oracle init.ora parameter “lock_sga=true” , the instance will not start, gets ORA-27102: out of memory Linux-x86_64 Error: 12: Cannot allocate memory on startup.

This happens due to “ulimit -l” parameter is not set to allow the amount of memory (sga size) being requested to be locked. For example:

# ulimit -a
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 20
file size (blocks, -f) unlimited
pending signals (-i) 16382
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 8192
cpu time (seconds, -t) unlimited
max user processes (-u) unlimited
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited

Issue command “ulimit -l unlimited” prior to starting the instance.

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