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Overview of Oracle RAC Installation and Database Creation. Overview of Extending the Oracle Grid Infrastructure and Oracle RAC Software .. Oracle Real Application Clusters (RAC) continues to be the premium . SCAN, see aracer.mobi This document is intended to be a checklist for Developers who expect their applications to run on Oracle Real Application Clusters (RAC) database. The goal is.

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Oracle Rac Pdf

OPS, but still slow adoption. Oracle9i introduced RAC with Cache. Fusion technology. Oracle10g introduced. Oracle. Clusterware and many RAC enhancements. needs special licensed software such as Oracle RAC to cluster the .files. aracer.mobi Built on Oracle Parallel Server (OPS) architecture, Oracle introduced Real. Application Clusters (RAC) with Oracle 9i. Oracle RAC also is a key part of the Oracle.

These servers are configured with redundant hardware and software components to eliminate single points of failure SPOFs. Serviceguard is designed to keep application services running in spite of failures of hardware for example System Processing Unit, disk, LAN, etc. In the event of a hardware or software failure, Serviceguard and other high-availability subsystems coordinate the transfer of functions from failed to working components. Serviceguard uses packages to group together sets of application services e. Packages are typically configured to run on several nodes in the cluster, one at a time, or simultaneously Serviceguard implements a shared-nothing cluster model. In the event of a service, node, network, or other monitored package resource failure on the node where the package is running, Serviceguard can automatically transfer control of the package to another node in the cluster, keeping the services available with minimal interruption. Figure 1 shows an example of a Serviceguard cluster. Oracle RAC Starting with the 10g release, Oracle includes its own clusterware software with the database products. In 10gR2, Oracle started using the term Oracle Clusterware to describe its clusterware. CSS manages the cluster by controlling which nodes are members of the cluster and by notifying other members when a node joins or leaves the cluster. If third-party cluster software such as SGeRAC is used in the environment, CSS utilizes the group membership service provided by the third-party cluster software. CRS manages high availability operation within a cluster.

RoadMap[ edit ] There are five items on the roadmap: Continue recruitment of new organizers, writers, and maintainers even short-term and support all events. Also continue discussing and improving project organization and strategy.

VirtualBox platform option. Technical goal for the project roadmap - provide labs for virtualbox with the same high quality as the current VMware labs. EC2 platform option.

But some work has already been done in this area by contributors to this project and we can definitely be the first ones to publish a quality lab handbook on EC2!

Oracle RAC Interview Questions

Complete and cleanup the local manual of style. This spells out conventions for all content in this book. It's mostly up-to-date but just needs to be made a little more user-friendly and loose ends need to be tied up. Wikibook Cleanup: Tagging reading level, subjects, categories, etc , Review Process for changes to non-bullpen content , Collections, PDF and printed books.

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These features are all strongly supported by and tightly integrated with the wikibooks platform. We want this book to follow wikibooks conventions and be as "wiki-friendly" as possible.

IOUG had a classroom full of PCs, and because of a cancellation the room became empty for an afternoon. It didn't seem right to have so many PCs sitting idle at an educational event like Collaborate, so Jeremy and a few others created a set of labs - on the spot - to walk people through making a RAC cluster on OEL with VMware.

Using these labs, they offered an impromptu hands-on RAC workshop to Collaborate participants. The workshop was received well and before long there were requests to repeat and enhance it. You Can Help!!! There are many things you can do to help: add new pages tutorials or reference material upload new images screen shots edit existing pages correct errors, improve the writing, or make additions join the team responsible for this WikiBook Read our Local Manual of Style to learn about conventions used in this book.

This manual itself actually needs some work too, so your contributions toward improving this documentation of existing conventions would be very welcome. This mode is not recommended due to the network switch being a SPOF in this configuration.

Cluster Interconnect Subnet monitoring Starting with A. This is shown in Figure 5. Figure 5: Network Switch APA: Serviceguard local LAN failover works very fast for failover of an IP address to an available standby executing a failover in seconds with the default 2-second polling interval.

Beginning with Serviceguard A. The IP Monitor provides the capability to monitor network status beyond the first level of switches, and detect errors that prevent packets from being received but do not affect the link-level health of an interface. This section discusses several different options and the supported HA configuration for each option. This is the recommended configuration because it provides the fastest cluster and RAC recovery if all private networks for a node fail.

Private network configuration option 1 Recommended Configuration 2 HA choices for common dedicated network for: CSS only supports one active network and Serviceguard heartbeat will fail and cause the node to be evicted if the network used by CSS fails.

If you do not do this, it will take a CSS timeout of seconds before node failure and recovery will occur. Configuration Option 1a For some configurations, it is preferable to set up redundant, active Serviceguard heartbeat networks. The second Serviceguard heartbeat provides additional robustness and enables faster cluster reformation time, leading to improved availability.

This can lead to unnecessary cluster reformations, and even nodes being evicted from the cluster, in high-traffic scenarios. As compared to Option 1, this configuration provides protection against high Cache Fusion traffic interfering with the Serviceguard heartbeat, by way of the second, redundant Serviceguard heartbeat.

A recommended practice is to configure cluster interconnect monitoring to provide additional robustness for monitoring the CSS heartbeat.

Figure 7: Private network configuration Option 1a 2 HA choices for common dedicated network for: Auto- Port Aggregation Advantages of configuration Option 1a: This can lead to a node being evicted from the cluster. Therefore, for this configuration, the RAC interconnect network can be configured on its own dedicated network separate from the cluster heartbeat network.

Otherwise, it will take up to 17 minutes for RAC to recognize the failure and do a recovery. Figure 8: Private network configuration Option 2 2 HA choices for common dedicated network for: If you do not do this it will take a timeout of seconds before node failure and recovery will occur. Table 1 shows the storage management choices for various data used in an RAC cluster. Table 1. The following section provides further details on each of the storage management options.

If a raw device is used, it must be accessible by all nodes in the cluster simultaneously. This can be accomplished by directly accessing a physical disk connected to all systems; however, this device has no protection from failure, unless mirrored at the storage array or volume manager level.

Devices under the CFS have inherited mirroring and multi-pathing features from CVM to increase device resiliency should any individual disk fail or if the need arises to relocate or resize either component. Additionally, CFS greatly simplifies management of file growth by directly reporting currently-allocated space in use for each file, while also reducing the number of devices to manage, since the OCR file and Voting Disk may both reside in the same CFS mount.

Understanding Oracle 12c Real Application Clusters (RAC)

Without CFS, the archive logs of each instance are stored in a local file system on the node where the instance is running. This eliminates the need to do NFS mounts or manual intervention for backup and recovery, simplifying management of both. Installing CRS software and RAC software on the CFS reduces the amount of storage space needed in comparison to installing on the local file system of each node in the cluster.

The resulting performance is equivalent to performance when using raw devices. The performance improvements are based on the following: In addition to using the memory inefficiently, this double buffering also consumes additional CPU resources an additional memory-to-memory system call is required.

Storage Checkpoints enable efficient backup and recovery of an Oracle database.

The Storage Checkpoint facility is similar to the snapshot file system mechanism except that a Storage Checkpoint persists after a system restart. A Storage Checkpoint creates an exact image of a database instantly and provides a consistent image of the database from the time the Storage Checkpoint is created. Like a snapshot file system, a Storage Checkpoint appears as an exact image of the snapshot file system at the time the Storage Checkpoint is made.

However, unlike a snapshot file system that uses separate disk space, all Storage Checkpoints share the same free space pool where the primary file system resides. A Storage Checkpoint can be mounted as read-only or read-write, allowing access to files as if it were a regular file system. A direct application of the Storage Checkpoint facility is Storage Rollback. Because each Storage Checkpoint is a consistent, point-in-time image of a file system, Storage Rollback is the restore facility for these on-disk backups.

Storage Rollback rolls back blocks contained in a Storage Checkpoint into the primary file system for faster database recovery. Storage rollback restores a database, a tablespace or datafiles in the primary file system to the point-in-time image created during a Storage Checkpoint.

Storage Rollback is accomplished by copying the before images from the appropriate Storage Checkpoint back to the primary file system. As with Storage Checkpoints, Storage Rollback restores at the block level, rather than at the file level. Access to mapping information allows for a detailed understanding of the storage hierarchy in which files reside. These views enable you to locate the exact disk on which any specific block of a file resides.

Voting Disk and OCR. Figure 9: When the software is installed on CFS, node-specific directories are created to hold log and trace files that are generated from Oracle Clusterware processes and the RAC instance running on each node.

All the log and trace files from all nodes in the cluster are stored in a shared CFS mount point; therefore, the file system can fill up quickly. Before SNOR was available, reconfiguration of a volume group, such as adding a physical device to increase the volume group size, would require taking all RAC instances offline. SNOR improves online configuration by allowing one instance to be online accessing the data while the volume group holding the database data is reconfigured.

Applications can continue to use these volume groups without interruption while the volume groups are being reconfigured. The recommended value is: These directories may be changed in later versions of Oracle. Cluster-wide Device Files, available starting with Serviceguard A. For more information, see Managing Serviceguard eighteenth edition. Criteria for choosing the right storage management for RAC There are always pros and cons with each storage management option.

The following list provides some criteria one should consider when making a decision: Table 2. When Oracle RAC is configured in an SGeRAC environment, the pieces of the combined stack start up and shut down in the proper sequence and the startup and shutdown sequences can be automated. In particular, the storage needed for the operation of Oracle Clusterware must be started before the Oracle Clusterware processes are started.

Likewise, the storage needed for the operation of a RAC database instance has to be started before the RAC database instance is started. On shutdown, the sequence is reversed; Oracle Clusterware and the RAC database instance must be terminated before shutting down the storage needed by these two entities.

The startup and shutdown of the RAC database instance—as Oracle Clusterware itself is started up and shut down—can be performed automatically or on demand.

For the CFS, there is the Oracle Disk Manager that provides near-raw-volume performance with the manageability of a file system. HP believes the unique capabilities of its Serviceguard suite and the robustness it provides best meet the high-availability and disaster recovery requirements of a large majority of Oracle database deployments on HP-UX.

Expert Oracle RAC 12c

The information contained herein is subject to change without notice. The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services.

Nothing herein should be construed as constituting an additional warranty. HP shall not be liable for technical or editorial errors or omissions contained herein. Intel and Itanium are trademarks of Intel Corporation in the U. Related Papers. By Boumediene Bouzidi. By Syed Hashmi.

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