Internal Error Svr4 Error 11 Resource Temporarily Unavailable Work — Ora-27103

Use free -m or vmstat to monitor memory and swap usage.

oracle soft nproc 16384 oracle hard nproc 32768 oracle soft nofile 65536 oracle hard nofile 65536

tail /var/adm/messages

Always start with ipcs and kernel parameter checks. Clean IPC remnants, tune shmmax/shmall and semaphore settings, and validate user limits. In most cases, these steps resolve the error permanently. If problems persist, consider reducing SGA as a temporary workaround while planning a maintenance window for OS reconfiguration.

Reboot required for Solaris changes.

Oracle uses semaphores to coordinate background processes and manage locks. Each Oracle instance consumes a semaphore set. If the system’s semmns (total semaphores system-wide) or semmsl (semaphores per set) is too low, Oracle fails to acquire semaphores, triggering errno 11.

Compare with OS limits:

Oracle uses System V Shared Memory to map the System Global Area (SGA). If the database tries to grab a chunk of memory that exceeds the defined segment size, or if the system has run out of available semaphore identifiers, the OS returns EAGAIN , and Oracle throws ORA-27103.