| 摘要 |
In a database apparatus ( 10 ), a critical database server ( 12 ) includes a primary server ( 20 ) supporting a primary database instance and a secondary server ( 22 ) supporting a secondary database instance that mirrors the primary database instance. The secondary server ( 22 ) generates an acknowledgment signal ( 60 ) indicating that a selected critical database transaction ( 42 ) is mirrored at the secondary database instance. A plurality of other servers ( 14, 16, 18 ) each support a database. A data replicator ( 30 ) communicates with the critical database server ( 12 ) and the other servers ( 14, 16, 18 ) to replicate the selected critical database transaction ( 42 ) on at least one of said plurality of other servers ( 14, 16, 18 ) responsive to the acknowledgment signal ( 60 ).
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