title: ORACLE 18c in CentOs 7 "Unable to check for available memory"
body: <p>I download and upload to server:</p>
  
  <p>1// <strong>oracle-database-preinstall-18c-1.0-1.el7.x86_64.rpm</strong></p>
  
  <p>2// <strong>oracle-database-xe-18c-1.0-1.x86_64.rpm</strong></p>
  
  <p>after I run</p>
  
  <pre><code>yum -y localinstall oracle-database-preinstall-18c-1.0-1.el7.x86_64.rpm
  </code></pre>
  
  <p>all fine, no problem; after I run:</p>
  
  <pre><code>rpm -i oracle-database-xe-18c-1.0-1.x86_64.rpm
  </code></pre>
  
  <p>all fine, no problem with result:</p>
  
  <pre><code>[root@server 000]# rpm -i oracle-database-xe-18c-1.0-1.x86_64.rpm
  warning: oracle-database-xe-18c-1.0-1.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID ec551f03: NOKEY
  [INFO] Executing post installation scripts...
  [INFO] Oracle home installed successfully and ready to be configured.
  To configure Oracle Database XE, optionally modify the parameters in '/etc/sysconfig/oracle-xe-18c.conf' and then execute '/etc/init.d/oracle-xe-18c configure' as root.
  [root@server 000]#
  </code></pre>
  
  <p>then I go to "run last line", but when I run</p>
  
  <pre><code>/etc/init.d/oracle-xe-18c configure
  </code></pre>
  
  <p>in server with <strong>4 GB RAM</strong> result is:</p>
  
  <pre><code>Unable to check for available memory
  </code></pre>
  
  <p>then I go to other server with 8GB in memory, and when I run:</p>
  
  <pre><code>/etc/init.d/oracle-xe-18c configure
  </code></pre>
  
  <p>in server with <strong>8 GB RAM</strong> result is:</p>
  
  <pre><code>Unable to check for available memory
  </code></pre>
  
  <p>in both servers message is:</p>
  
  <pre><code>Unable to check for available memory
  </code></pre>
  
  <p>in both servers:</p>
  
  <pre><code>[root@server 000]# cat /etc/system-release;
  CentOS Linux release 7.6.1810 (Core)
  [root@server 000]#
  </code></pre>
  
  <p>also I change from default [false] to [true]:</p>
  
  <pre><code>SKIP_VALIDATIONS=true
  </code></pre>
  
  <p>in <strong>/etc/sysconfig/oracle-xe-18c.conf</strong></p>
  
  <p>what I can do to resolve this issue?</p>
  
  <p>this is dedicated server, no VPS</p>
  
  <p>Thanks by your help</p>