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Oracle – RAC

//Oracle – RAC

What happens if I lose my voting disk(s)?

By | February 2nd, 2014|Database, Oracle – RAC, Oracle DBA|

If you lose 1/2 or more of all of your voting disks, then nodes get evicted from the cluster, or nodes kick themselves out of the cluster. It doesn't threaten database corruption. Alternatively you can use external redundancy which means you are providing redundancy at the storage level using RAID. For this reason when using [...]

What is voting disk and used for?

By | February 1st, 2014|Database, Oracle – RAC, Oracle DBA|

A voting disk is a backup communications mechanism that allows CSS daemons to negotiate which sub-cluster will survive. These voting disks keep a status of who is currently alive and counts votes in case of a cluster reconfiguration. It works as follows: a) Ensures that you cannot join the cluster if you cannot access the [...]

How to use VLANs in Oracle RAC?

By | September 29th, 2013|Oracle – RAC, Oracle DBA|

It is Oracle's standing recommendation to separate the various types of communication in an Oracle RAC cluster as much as possible. This general recommendation is the basis for the following separation of communication: Each node in an Oracle RAC cluster must have at least one public network. Each node in an Oracle RAC cluster must [...]

Oracle Single Client Access Name (SCAN)

By | September 3rd, 2013|Oracle – RAC, Oracle DBA|

Single Client Access Name (SCAN) is a single name that allows client connections to connect to any database in an Oracle cluster independently of which node in the cluster the database (or service) is currently running. The SCAN should be used in all client connection strings and does not change when you add/remove nodes from [...]

What Application Design considerations should I be aware of when moving to Oracle RAC?

By | September 30th, 2011|Oracle – RAC, Oracle DBA|

The general principals are that fundamentally no different design and coding practices are required for RAC however application flaws in execution or design have a higher impact in RAC. The performance and scalability in RAC will be more sensitive to bad plans or bad schema design. Serializing contention makes applications less scalable. If your customer [...]

What should I do to make my Oracle RAC deployment highly available?

By | September 29th, 2011|Oracle – RAC, Oracle DBA|

Customers often deploy Oracle Real Application Clusters (RAC) to provide a highly available infrastructure for their mission critical applications. Oracle RAC removes the server as a single point of failure. Load balancing your workload across many servers’ along with fast recovery from failures means that the loss of any one server should have little or [...]