Replication between more than two databases

Basically rubyrep can only scan / sync / replicate betwee two databases.
However there is a simple approach possible to keep more than two databases in sync.

Example:

  • Scenario: The databases A, B and C should be kept in sync.
  • Solution:
    • A replicates with C
    • B replicates with C

Effectively this is a replication in the star schema and an arbitrary number of databases could be kept in syn.

To accomplish this, the :rep_prefix of all replication setups has to be kept unique.
(This will ensure that each replication uses it’s own triggers, change log tables, etc.)

  Hint Use the ruby require command to keep the rubyrep config files DRY.
  Important MySQL only supports one after trigger per table. This means that above approach is not possible with MySQL