Symptom:As part of a database tuning effort you increase the SGA/PGA sizes; and Oracle greets with an ORA-27102: out of memory error message. The system had enough free memory to serve the needs of Oracle.SQL> startupORA-27102: out of memorySVR4 Error: 22: Invalid argumentDiagnosis$ oerr ORA 2710227102, 00000, "out of memory"// *Cause: Out of memory// *Action: Consult the trace file for detailsNot so helpful. Let's look the alert log for some clues.% tail -2 alert.logWARNING: EINVAL creating segment of size 0x000000028a006000fix shm parameters...