This is what I have : # Controls the maximum shared segment size, in bytes kernel.shmmax = 68719476736 # Controls the maximum number of shared memory segments, in pages kernel.shmall = 4294967296 ########### # Oracle Database 11g Express Edition Recommended Values kernel.sem = 250 32000 100 128 fs.file-max = 6815744 ######## John Dunn Product Consultant Sefas Innovation Limited. Tel: + 44 (0) 117 910 0529 www.sefas.com<http://www.sefas.com/> From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Hans Forbrich Sent: 12 March 2014 12:47 To: oracle-l@xxxxxxxxxxxxx Subject: Re: Oracle-xe memory issues on linux Is this a new installation or has it worked before? First guess is that you do not have the shared memory and semaphores configured - should be in /etc/sysctl.conf /Hans On 12/03/2014 4:51 AM, John Dunn wrote: I am getting the following error on RHEL 5.4 Oracle XE 11.2.0.2.0 Any idea what the issue is? ERROR: ORA-01034: ORACLE not available ORA-27102: out of memory Linux-x86_64 Error: 12: Cannot allocate memory Additional information: 1 Additional information: 786432 Additional information: 8 Process ID: 0 Session ID: 0 Serial number: 0 John