Chapter 8. Data Availability

Availability is the Holy Grail of database administrators. If the data is not available, the applications cannot run. If the applications cannot run, the company is losing business. Therefore, the DBA is responsible for doing everything in his or her power to ensure that databases are kept online and operational. This has been the duty of the DBA since the first days of the database.

However, the need for availability is increasing. The age of the long batch window, where databases can be offline for extended periods to perform nightly processing, is diminishing. Exacerbating this trend is the drive toward e-business. Coupling businesses to the Internet is dramatically ...

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