| 摘要 |
A system includes a first database, a second database, a third database, and an application server. The first database server includes a database instance. The second database server is in communication with the first database server. The second database server includes a mirror of the database instance. The third database server is in communication with the second database server. The third database server is configured to store a copy of a database within the database instance. The application server is configured to be placed in communication with the first, second, and third database servers, configured to fail over between the first and second database servers, and further configured to fail over between the second and third database servers.
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