title: ORA-01033: ORACLE initialization or shutdown in progress database 12c error
body: <p>It was all ok before and my project was working.Today I have tried to start it, but recieved this error.
  After that I've tried to use the response to run sqlplus</p>
  
  <blockquote>
    <p>sqlplus /nolog</p>
  </blockquote>
  
  <pre><code>SQL&gt; connect / as sysdba
  </code></pre>
  
  <p>But after this line I've recieved this error:
  ORA-01017: invalid username/password; logon denied</p>
  
  <p>I am using oracle 12c database</p>