title: Reduce Memory Usage from 16GB to 8GB - Oracle
body: <p>I had created a oracle instance using "Database Configuration Assistant". My system is having 64GB RAM. I had given 16GB to oracle instance, in Initialization Parameters Wizard. </p>
  
  <p>Now i want to reduce that 16GB to 8GB. So that, the RAM occupied by oracle will be 8GB. I had tried this in SQL Developer,</p>
  
  <pre><code>ALTER SYSTEM SET pga_aggregate_target = 8289 M;
  ALTER SYSTEM SET sga_target = 1536 M;
  </code></pre>
  
  <p>I had restarted the oracle service. It not got reflected. Still the oracle is using 16GB.</p>
  
  <p>I dont know whether this is correct. Whether system reboot is needed for this.? or else how to reduce the memory usage.</p>