docs: public int removePDatabaseOwner(ThinPhysicalDatabaseOwner pDatabaseOwner, boolean bFreeIfEmpty)
      {
          m_setPDatabaseOwners.remove(pDatabaseOwner);
          if (bFreeIfEmpty)
              if (m_setPDatabaseOwners.size() == 0)
                  if (m_htTableList.size() == 0)
          {
              this.free();
              return 0;
          }
          return m_setPDatabaseOwners.size();
      }