What is Oracle RAC?
Oracle Real Application Clusters (RAC) is a database clustering solution that allows more than one instance to mount and open an Oracle database. RAC can only be used on special clustered systems with shared disk storage and a private network interconnect.
In normal Oracle, installation consists of a single Oracle instance that accesses a database on the same computer system, but RAC allows multiple instances on different computers to access the same database file.
RAC is available with Oracle Enterprise Edition, and under certain conditions, with Standard Edition as well
• Must use Oracle Clusterware (no third-party)
• Must Use ASM to store data files
In before Oracle 9i onwards RAC was previously called Oracle parallel server (OPS), then Oracle renamed into RAC when they released Oracle 9i
• Multi Node Linux management
• Shared Storage Management
• Network Management
• Virtual Machine Management
• SnapShot Management
• Cluster management via Oracle Clusterware
• Cluster resource management
Benefits of RAC
• High availability
• Better performance
• Speed up (transaction response time)
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Oracle RAC has wide scope in industry and candidates can apply for following positions:
• Oracle DBA Expert – Oracle RAC
• Oracle DBA Consultant
• Senior Database Administrator
• Lead Oracle DBA
• Oracle DBA Engineer
• Working knowledge of Linux/Unix
• Basic understanding of networks
• Good at Oracle Database Administration 10g or 11g
• Minimal Knowledge of VMware or VirtualBox
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