What is Oracle RAC instance?

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 is Oracle RAC and dataguard?

RAC provides for high availability (and scalability) “in a room”. Data Guard however provides for continuity of operations – if the room in which your RAC cluster resides “goes away” (fire, flood, explosion, whatever) data guard is “somewhere else, ready to take over”.

What is one node RAC concept?

RAC One Node is a multiple-instance of RAC running on a single node in a cluster and has a fast instance relocation feature in the event of a catastrophic or instant server failure. RAC works as a live-live solution.

How does Oracle RAC work?

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 use of Oracle RAC?

What processes are required in RAC?

The Oracle RAC processes and their identifiers are as follows:

• ACMS: Atomic Controlfile to Memory Service (ACMS)
• GTX0-j: Global Transaction Process.
• RMSn: Oracle RAC Management Processes (RMSn)
• RSMN: Remote Slave Monitor manages background slave process creation and communication on remote instances.

What is difference between Data Guard and RAC in Oracle?

so the difference between the two is that rac is highly available whereas the dataguard ensures data integrity. Since if the one oracle instance in rac has problem, then a restore will be inevitable. no. If one node goes down, the other node will take over for it.