+-------------------+
  |       HTTPD       |
  +-------------------+
   |   |
   |   |
   |   |          +---------------+
   |   +--------->| Other modules |
   |              +---------------+
   |
   |
  +----------------+
  |    mod_dblog   |
  | central module |
  +----------------+
     |   |         +----------------+
     |   +---------| RDBMS specific |
     |             |     module     |
     |             +----------------+
     |               |    |             +--------------+
     |               |    +-------------| connection 1 | ... [DB server 1]
     |               |                  +--------------+
     |               |        +--------------+
     |               +--------| connection 2 | ... [DB server 2]
     |                        +--------------+
     |
     |          +----------------+
     +----------| RDBMS specific |
                |      module    |
		+----------------+
		   |   |          +--------------+
		   |   +----------| connection 3 | ... [DB server 3]
		   |              +--------------+
		   |     +--------------+
		   +-----| connection 4 | ... [DB server 4]
		         +--------------+