code: private void updateNukerTimeStamp(Connection nukerCon, String appName) throws SQLException {
          if (com.ibm.websphere.ras.TraceComponent.isAnyTracingEnabled() && LoggingUtil.SESSION_LOGGER_WAS.isLoggable(Level.FINE)) {
              LoggingUtil.SESSION_LOGGER_WAS.entering(methodClassName, methodNames[UPDATE_NUKER_TIME_STAMP], "appName=" + appName);
          }
          PreparedStatement ps = null;
          long now = System.currentTimeMillis();
          try {
              ps = nukerCon.prepareStatement(asyncUpdate);
              setPSLong(ps, 1, now);
              ps.setString(2, appName);
              ps.setString(3, appName);
              ps.setString(4, appName);
              ps.executeUpdate();
  
          } finally {
              if (ps != null)
                  closeStatement(ps);
          }
          if (com.ibm.websphere.ras.TraceComponent.isAnyTracingEnabled() && LoggingUtil.SESSION_LOGGER_WAS.isLoggable(Level.FINER)) {
              LoggingUtil.SESSION_LOGGER_WAS.exiting(methodClassName, methodNames[UPDATE_NUKER_TIME_STAMP], "appName=" + appName);
          }
      }
docs: /*
  updateNukerTimeStamp
  When running in a clustered environment, there could be multiple machines processing invalidation.
  This method updates the last time the invalidation was run. A server should not try to process invalidation if
  it was already done within the specified time interval for that app.