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Which three statements are true about services when used with transparent application failover (TAF) for an administrator-managed RAC database?
Correct Answer: A,B,E
Explanation/Reference: Explanation: A: SESSION failover. When the connection to an instance is lost, SESSION failover results only in the establishment of a new connection to another Oracle RAC node; any work in progress is lost. SESSION failover is ideal for online transaction processing (OLTP) systems, where transactions are small. D: Oracle's answer to application failover is a new Oracle Net mechanism dubbed Transparent Application Failover. TAF allows the DBA to configure the type and method of failover for each Oracle Net client. E: http://practical-tech.blogspot.com/2012/09/oracle-rac-11gr2-server-side-taf-using_24.html Incorrect Answers: C. TAF only restart query not restart transaction. TAF can restart a query after failover has completed but for other types of transactions, such as INSERT, UPDATE, or DELETE, the application must rollback the failed transaction and resubmit the transaction. E: In PRECONNECT failover, the application simultaneously connects to both a primary and a backup node. This offers faster failover, because a pre-spawned connection is ready to use. But the extra connection adds everyday overhead by duplicating connections. References: http://www.dba-oracle.com/art_oramag_rac_taf.htm