Thanks Kevin... I am working on something different right now but I'll soon have to give it a go, one way or the other...
Michael
On Tue, Jul 8, 2008 at 3:28 PM, Kevin Grittner <
Kevin.Grittner@wicourts.gov> wrote:
Our home-grown replication technique does synchronization checks
during idle time. It works pretty well for us, and we do use md5sum
techniques to minimize bandwidth.
In summary, a process requests a middle tier on a "source" machine to
send "sync" information; that middle tier reads some set of rows and
sends the md5 sum of all data in the rows, along with information on
what rows from which table were used to develop the number. The
requesting process then asks similar middle tiers on all replication
targets to return their md5sum for the same set of rows. If there are
any differences, the source and all differing replication targets are
queried for the actual values, which are compared using match-merge
type logic on the primary key sequence.
Something similar might work for you.
-Kevin
