Ora-27103 Internal Error Svr4 Error 11 Resource Temporarily Unavailable Official

After adding 48GB RAM to a production server, DBA increased SGA_TARGET to 40GB and restarted. Instance failed with ORA-27103 .

Incorrect initialization parameters can cause ORA-27103 during startup. After adding 48GB RAM to a production server,

Example formula: shmall >= (SGA_MAX_SIZE / page_size) + overhead. After adding 48GB RAM to a production server,

kernel.pid_max = 65536

$ORACLE_HOME/bin/sysresv -i <instance_number> -c After adding 48GB RAM to a production server,