A method for calling gains and losses in array CGH data by Wang P.

By Wang P.

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By Wang P.

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RAC can be a complex and costly technology to implement. It requires higher levels of skill and experience to architect, install, configure, tune, and support. The licenses may cost significantly more than comparable single-instance systems. So why are so many users interested in implementing RAC? Most users implement RAC to achieve either higher availability, greater scalability, or a combination of these. Other users implement RAC to simplify database management or to reduce the cost of ownership of their database systems.

A number of possible solutions exist in the Oracle RAC environment: • Storage-level replication • Database replication • Logical standby • Physical standby • Stretch clusters Storage-level replication mirrors changes to data in the storage subsystem across a wide area network (WAN). 2. 2. To maintain a logical standby database, statements executed on a local database are reexecuted on one or more remote databases. 3. To maintain a physical standby database, changes performed on the local database are reapplied on one or more remote databases.

Developments in storage technology, together with the introduction of new features such as the Partitioning option, guarantee that Oracle databases can grow in size almost without restriction. qxd 7/7/06 11:24 AM Page 13 CHAPTER 1 ■ INTRODUCTION TO RAC of the database itself can grow almost infinitely, the size of the workload is still restricted by the server on which the instance that is accessing the database is running. The RAC option removes this restriction by allowing more than one instance to access the same database concurrently.

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