title: How do I resolve this "ORA-01109: database not open" error?
body: <p>I'm trying to create my own database using SQLPlus. So first I log into it as admin:</p>
  
  <pre><code>sqlplus sys/sys_password as sysdba
  </code></pre>
  
  <p>And then I try to create a new user, called sqlzoo :</p>
  
  <pre><code>CREATE USER sqlzoo IDENTIFIED BY sqlzoo 
  DEFAULT TABLESPACE tbs_perm_01sqlzoo 
  TEMPORARY TABLESPACE tbs_perm_01sqlzoo 
  QUOTA 20M ON tbs_perm_01sqlzoo;
  </code></pre>
  
  <p>This gives me the following error :</p>
  
  <pre><code>ERROR at line 1:
  ORA-01109: database not open
  </code></pre>
  
  <p>Why is it giving me such an error?</p>