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Managing the Exadata Database Machine
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NOTE This chapter does not focus on administration of the database servers in the Exadata Database Machine The database servers are managed, maintained, and monitored similar to a regular Oracle Database 11g Release 2 utilizing Real Application Clusters (RAC) and Automatic Storage Management (ASM) When required, you would patch the Oracle database and the grid infrastructure software, perform administration tasks, monitor and tune the databases, back up the database and operating system, and perform database upgrades, just as you would on standard Oracle systems Moreover, you need to manage the database server nodes operating system (Oracle Linux or Solaris) and the hardware as you would normally manage any other Intel-based servers in your data center Please also refer to 2
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At a high level, the Exadata Database Machine is composed of a database grid, a storage grid, and the InfiniBand network that provides the unified fabric for storage and database interinstance communication The Oracle Sun servers that comprise the database and the storage grids are built using open standards-based hardware, and are made of components that are normally found in enterprise-class servers such as CPUs, memory, PCIe slots, hard disks, Host Channel Adapters (HCA), and Ethernet interfaces The operating system managing the Oracle Sun servers that are the Oracle Exadata Storage Server cells in the storage grid is Oracle Linux In the following section, we will discuss the architecture of the software components of Exadata Database Machine in detail
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The database grid of the Database Machine utilizes Oracle ASM as the storage management layer Oracle ASM acts as the cluster volume manager
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Achieving Extreme Performance with Oracle Exadata
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for the storage served by the Exadata Storage Servers, and is the only software that can be used to manage the storage grid of the Database Machine Moreover, you are not allowed to directly attach or mount the storage served by the Exadata Storage Servers to any other server or storage volume manager Oracle ASM provides data placement and management services on the Exadata Storage Servers, stripes and mirrors the database extents into chunks called ASM allocation units (ASM AU, also called ASM extents), and spreads them across the disks served by the Exadata Storage Servers Oracle ASM provides high availability of the extents and eliminates single points of failure by keeping a mirrored copy of the extent available at all times The striping of data by ASM provides optimal I/O performance, as the I/O requests will be parallelized across all the available Exadata Storage Servers in the grid that houses the striped data Oracle ASM will be active during the initial placement of data, and also when performing ongoing management operations, such as rebalancing of data across the Exadata Storage Servers The database server processes initiate I/O requests directly with the Exadata Storage Servers and bypass the Oracle ASM instance, thus reducing the unnecessary overhead of involving ASM for each database I/O operation The direct communication of the database with the storage is possible because the database server stores the extent maps of ASM files in the SGA, which enables read/write I/O requests directly with the Exadata Storage Servers without requiring the Oracle ASM instance This method of initiating I/O requests is the same when the ASM files reside on non-Exadata based storage The database server process and the Oracle ASM instance communicate with Exadata Storage Servers using the iDB protocol iDB is a data transfer protocol implemented in the Oracle kernel and provides intelligence that enables the database and ASM instances to utilize Exadata-specific features such as offload processing and I/O Resource Manager (IORM) iDB is built upon Reliable Datagram Sockets (RDS), which is the same protocol used by database RAC interinstance communication over the InfiniBand network RDS incorporates optimizations such as Remote Direct Memory Access (RDMA) to minimize the network protocol overhead by allowing distributed applications to transfer data directly between their memory structures without involving the operating system memory, a feature that is more commonly referred to as Zero-copy Datagram Protocol (ZDP) The RDS protocol also enables iDB to facilitate I/O bandwidth allocations for Exadata IORM, and provides bandwidth aggregation and failover of the InfiniBand network The iDB communication is facilitated by
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