@Override
  public int estimateSize() {
    return 8 + 8 + 112;
  }
The memory occupied by an DatabaseDeviceInfo based occupation

<ol>
  <li>object header, 8B
  <li>reference schemaengine, 8B
  <li>object TDatabaseSchema, 112B (calculated by RamUsageEstimator)
</ol>
iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/persistence/schema/mnode/info/ConfigDatabaseInfo.java