Recommended Stretagy For Bi-Directional SQL DB Synchronization

Hi,

Our company is an independent Voice applications solution provider with
number clients using our suite. We have a CT application suite which is
running with Application Server and SQL Server 7 / 2000 as DB Engines
at the back end.

The SQL server has two databases configured:

Logging Database - Massive updates every second, the data grows
rapidly,

Configuration Database - Generally small-sized and updated
occasionally.

Now we want to have the reslience implemented on the server. We have to
synchronize the two databases 'real-timely' and in 'efficient'
manner, so that if Primary server or its Databases gets unavailable,
the users are seamlessly switched over to the Secondry server that will
have its own set of data updated and well synchronized.

Typically, it can be explained as follows:

1. We will have 2 database servers A - Primary (acting as publisher)
and B - Secondary (acting as subscriber). Our application will be
initially connected to A.

2. When A becomes unavailable (for whatever reason), the application
will fail-over to B.

3. All the users will be switched to server B and the updates are being
done accordingly without being replicated on Server A temporarily.

4. When A is back on-line, A needs to be brought up-to-date with B
automatically (In other words, I shouldn't have to manually export all
the data from B to A ).

Our requirements are:

- The system should support Bi-directional Synchronization
between both the servers for their set of databases (the logging and
configuration).

- There will be constant and heavy activity in Logging
Database, thus if one server gets down the data should be logged and
maintained as it is on second server and on fail-back no data-loss
should occur with minimum latency time.

- There could be a scenario when a server fails-over for a
week's time, there will be constant logging each second! Once it
fails-back the system should rapidly synchronize the data without
noticeable delay among the two server database sets.

- The system should also work fine if certain amount of
records are purged over a time period.

Our concern is, observing the above scenario, how any of your SQL
server replication strategy can help us achieve the requirements.


Thanks
John