Does Oracle RAC require shared storage?

You can only use Direct NFS Client to store Oracle Database files. To install Oracle RAC on Windows using Direct NFS Client, you must have access to a shared storage method other than NFS for the Oracle Clusterware files.

What is the difference between Oracle RAC and non RAC?

Oracle RAC allows multiple computers to run Oracle RDBMS software simultaneously while accessing a single database, thus providing clustering. In a non-RAC Oracle database, a single instance accesses a single database. The database consists of a collection of data files, control files, and redo logs located on disk.

What is the difference between Oracle RAC and dataguard?

Data Guard and RAC both are different and serve different purpose. RAC is multiple instances accessing a single database with key features availability, scalability and manageability. Data Guard software maintains a real time copy of the production database called a standby database.

Does Oracle RAC require ASM?

Also, ASM is required for Oracle RAC Standard Edition deployments but Enterprise Edition deployments can use a clustered file system. ASM is not limited to Oracle’s clustered databases. Single-instance databases can be deployed on ASM file systems as well.

What files components in RAC must reside on shared storage?

The following files reside on Shared Storage and are accessible by all the RAC instances at the same time.

• Data Files, which make up the main data storage file structures.
• Control Files.

What is difference between standalone and RAC database?

In a single-instance database, there is a one-to-one relationship between the instance and the database. An instance can access one and only one database. With Oracle RAC, there are multiple instances for one database. Each instance runs on a separate database server, called a node in the cluster.

What are the benefits of Oracle RAC?

The benefits of Oracle RAC

• Oracle RAC provides such a high availability (HA) environment with automatic failover and load balancing of transactions across cluster nodes (database instances).
• Oracle Extended RAC increases database resiliency between two locations, while it benefits from the cluster HA.

What is the difference between Oracle RAC and Grid?

Thus, RAC is an integral part of Grid computing, but it is not the sum total of it. The goal of Grid computing is to supply high availability information sharing supported by an architecture with sufficient resource allocation such that users can rely on getting as much information or processing as they need on demand.

What is difference between Data Guard and Active Data Guard?

The main difference between Oracle Data Guard and Active Data Guard is that Oracle Data Guard is an extension to the Oracle RDBMS that provides data availability and protection while Active Data Guard is an extension of Oracle Data Guard that improves the production database performance for critical transactions.

What is OCR in Oracle RAC?

Oracle Cluster Registry (OCR) The OCR contains cluster and database configuration information for RAC and Cluster Ready Services (CRS) such as the cluster node list, and cluster database instances to node mapping, and CRS application resource profiles. The OCR is a shared file located in a cluster file system.

What is GRD in Oracle RAC?

Global Resource Directory (GRD) is not a database. It is a collection of internal structures and is used to find the current status of the data blocks. Whenever a block is transferred out of a local cache to another instance’s cache, the GRD is updated.

What is Oracle RAC cluster?

Oracle Real Application Clusters (RAC) allow customers to run a single Oracle Database across multiple servers in order to maximize availability and enable horizontal scalability, while accessing shared storage.

What are the advantages of ASM?

ASM provides the following benefits: Striping—ASM spreads data evenly across all disks in a disk group to optimize performance and utilization. This even distribution of database files eliminates the need for regular monitoring and I/O performance tuning.

Can Oracle RAC run on VMware?

From VMware’s perspective, All Oracle products including Oracle RAC will be supported by VMware, anywhere and everywhere vSphere runs on all VMware Hybrid Cloud platforms including on-premises and all of the VMware Cloud offerings.

What is the difference between physical standby and logical standby?

Definition. The logical standby database is a database that does not have the schema structure exactly similar to the source database. In contrast, a physical standby database is a database that replicates the exact contents of its primary database across the Oracle Net Network layer.

What are the different services available in Oracle Data Guard?

Following are the different Services available in Oracle Data Guard of Oracle database: Redo Transport Services….Ans:

• High Availability.
• Data Protection.
• Off loading Backup operation to standby database.
• Automatic Gap detection and Resolution in standby database.
• Automatic Role Transition using Data Guard Broker.

How many data files must be shared in Oracle RAC?

All data files (including an undo tablespace for each instance) and redo log files (at least two for each instance) for an Oracle RAC database must reside on shared storage.

What is the difference between Oracle RAC and non-cluster Oracle Database?

Unless otherwise noted, Oracle Database storage features such as Oracle ASM, Oracle Managed Files, automatic segment-space management, and so on, function the same in Oracle RAC environments as they do in non-cluster Oracle database environments.

What is the difference between Oracle ASM and Oracle RAC?

The shared disk requirement is the only substantial difference between using Oracle ASM with an Oracle RAC database compared to using it with a noncluster Oracle database. Oracle ASM automatically redistributes the data files after you add or delete a disk or disk group.

What happens when I remove an instance from Oracle RAC?

During database recovery, all enabled instances are checked to see if recovery is needed. If you remove an instance from your Oracle RAC database, then you should disable the instance’s thread of redo so that Oracle does not have to check the thread during database recovery.