code: public EnvironmentConfig setGcMinUtilization(int percent) throws InvalidSettingException {
          if (percent < 1 || percent > 90) {
              throw new InvalidSettingException("Invalid minimum log files utilization: " + percent);
          }
          return setSetting(GC_MIN_UTILIZATION, percent);
      }
docs: Sets percent of minimum database utilization. Default value is {@code 50}. That means that 50 percent
  of free space in raw data in {@code Log} files (.xd files) is allowed. If database utilization is less than
  defined (free space percent is more than {@code 50}), the database garbage collector is triggered.
  <p>Mutable at runtime: yes
  
  @param percent percent of minimum database utilization
  @return this {@code EnvironmentConfig} instance
  @throws InvalidSettingException {@code percent} is not in the range [1..90]