High availability benefits and workload balancing outweigh performance concerns. mysql - Split brain scenario - RAC and PXC - Database Administrators In the figure, Node 2 is now the active instance connected to the Oracle database and servicing applications and users. Split brain syndrome occurs when the instances in a RAC fails to connect or ping to each other via the private interconnect. Now talking about split-brain concept with respect to oracle . You should adopt the MAA best practices to achieve the optimal recovery time and configuration. An Oracle RAC database is connected to three instances on different nodes. The sum of benefits of Oracle Clusterware with Oracle Data Guard, Best high availability, data protection, and disaster-recovery solution with scalability built in, The sum of benefits of Oracle RAC with Oracle Data Guard, Oracle Database with Oracle GoldenGateFoot3, Bidirectional replication and information management, Replica database (or databases) available for read/write use, Fast failover for computer failure and storage failure, Minimum downtime for computer or site maintenance and database and application upgrades. What is split brain in RAC? - TheNewsIndependent Split Brain Condition occurs when a single cluster has a failure that results in reconfiguration of cluster into multiple partitions, with each partition forming its own sub-cluster without the knowledge of the existence of other. I go through blogs mentioning what exactly a Split brain syndrome is ( Theoretical Part). The servers on which you want to run Oracle Clusterware must be running the same operating system. This book focuses primarily on the database high availability solutions. Table 7-5 compares the attainable recovery times of each Oracle high availability architecture for all types of planned downtime. Figure 7-3 Oracle Database with Oracle Clusterware (After Cold Cluster Failover). The SELECT statement is used to retrieve information from a database. The basic function of a cold cluster failover is to monitor a database instance running on a server, and if a failure is detected, to restart the instance on a spare server in the cluster. Oracle RAC Interview Questions - Coherence and Split-Brain Hence, to protect the integrity of the cluster and its data, the split-brain must be resolved. After you have chosen an architecture, then implement it using the operational and configuration best practices described in the MAA white papers and in Oracle Database High Availability Best Practices. (adsbygoogle=window.adsbygoogle||[]).push({}); Split Brain is often used to describe the scenario when two or more nodes in a cluster, lose connectivity with one another but then continue to operate independently of each other, including acquiring logical or physical resources, under the incorrect assumption that the other process(es) are no longer operational or using the said resources.
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