![]() ![]() This scenario offers advantages such as better performance, scalability and redundancy. If the Oracle database administrator has implemented Oracle RAC (Real Application Clusters), then multiple instances, usually on different servers, attach to a central storage array. ![]() Processes can in turn archive the online redo logs into archive logs (offline redo logs), which provide the basis (if necessary) for data recovery and for some forms of data replication. In addition to storage, the database consists of online redo logs (or logs), which hold transactional history. The SGA typically holds cache information such as data-buffers, SQL commands, and user information. ![]() Users of the Oracle databases refer to the server-side memory-structure as the SGA (System Global Area). Typical processes include PMON (the process monitor) and SMON (the system monitor). An instance-identified persistently by an instantiation number (or activation id: SYS.V_$DATABASE.ACTIVATION#)-comprises a set of operating-system processes and memory-structures that interact with the storage.
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