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ORACLE DATABASE TUTORIAL PDF HOW TO
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ORACLE DATABASE TUTORIAL PDF PLUS
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The Clusterware software allows nodes to communicate with each other and forms the cluster that makes the nodes work as a single logical server. Oracle Clusterware software is designed to run Oracle in a cluster mode, it can support you to 64 nodes, it can even be used with a vendor cluster like Sun Cluster.

AUTOMATIC STORAGE MANAGEMENT (ASM): Oracle choice of storage management, its a portable, dedicated, and optimized cluster filesystem.

ORACLE DATABASE TUTORIAL PDF WINDOWS

Cluster FileSystem: used to hold all the Oracle datafiles can be used by Windows and Linux, its not used widely.

Raw Volumes: normally used for performance benefits, however, they are hard to manage and backup.

ORACLE DATABASE TUTORIAL PDF HOW TO

Once you have your storage attached to the servers, you have three choices on how to set up the disks There are many other raid levels that can be used with a particular hardware environment for example EMC storage uses the RAID-S, HP storage uses Auto RAID, so check with the manufacture for the best solution that will provide you with the best performance and resilience.

Slow write operations (caused by having to create the parity bit).

Raid 5- Raid stands for Redundant Array of Inexpensive Disks, the disks are striped with parity across 3 or more disks, the parity is used in the event that one of the disks fails, the data on the failed disk is reconstructed by using the parity bit.

Expensive (requires double the number of disks).

Highly Available (if one disk fails the mirror takes over).

raid 1 (Mirroring) A single disk is mirrored by another disk if one disk fails the system is unaffected as it can use its mirror.

Not highly available (if one disk fails, the volume fails).

The last thing to think about is how to set up the underlining disk structure this is known as a raid level, there are about 12 different raid levels that I know of, here are the most common ones raid 0 (Striping) A number of disks are concatenated together to give the appearance of one very large disk.

JBOD: direct-attached storage, the old traditional way and still used by many companies as a cheap optionĪll of the above solutions can offer multi-pathing to reduce SPOFs within the RAC environment, there is no reason not to configure multi-pathing as the cost is cheap when adding additional paths to the disk because most of the expense is paid when out when configuring the first path, so an additional controller card and network/fiber cables are all that is a need.

NAS ( Network Attached Storage): generally using a network to connect to the NAS using either NFS, ISCSI.SAN (Storage Area Networks) – generally using fiber to connect to the SAN.With today’s SAN and NAS disk storage systems, sharing storage is fairly easy and is required for a RAC environment, you can use the below storage setups Here is a list of processes running on a freshly installed RAC This course will help you to achieve excellence in this domain. If you would like to Enrich your career and get an Oracle RAC certified professional, enroll in our “ Oracle RAC Online Training” Course. The below diagram describes the basic architecture of the Oracle RAC environment The major components of an Oracle RAC system are

ORACLE DATABASE TUTORIAL PDF PLUS

Same as single instance plus can be placed on a shared file system allowing a common ORACLE_HOME for all instances in a RAC environment. Multiple instances on the same server accessing different databases cause the same executable files Private to each instance, other instances never read or write to those files.

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Private to the instance but other instances will need access to all required archive logs during media recovery If an instance is shut down, log switches by other instances can force the idle instance to redo logs to be archived Only one instance can write but other instances can be read during recovery and archiving. The instance has its own set of background processesĮach instance has its own set of background processesĭedicated for write/read to only one instance The table below describes the difference between a standard oracle database (single instance) and a RAC environment Component Oracle’s RAC is heavily dependent on an efficient, high reliable high-speed private network called the interconnect, make sure when designing a RAC system that you get the best that you can afford. Oracle RAC Tutorial - A Complete Beginners Guide Oracle RAC Tutorial - Table of Content This tutorial gives you an overview and talks about the fundamentals of Oracle RAC. In a standard Oracle configuration, a database can only be mounted by one instance but in a RAC environment, many instances can access a single database.

Oracle Real Application clusters allow multiple instances to access a single database, the instances will be running on multiple nodes.