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Which statement is true about using OPatch to patch Oracle Grid Infrastructure 12c?
As with standard upgrades to Oracle Grid Infrastructure, at any given point in time for normal operation of the cluster, all the nodes in the cluster must have the same software release and patch level. Because one-off patches can be applied as rolling upgrades, all possible patch levels on a particular software release are compatible with each other.
Note: Starting with Oracle Grid Infrastructure 12c Release 1 (12.1), a new cluster state called 'Rolling Patch' is available. This mode is similar to the existing 'Rolling Upgrade' mode in terms of the Oracle ASM operations allowed in this quiesce state.
References: https://docs.oracle.com/database/121/CWLIN/procstop.htm#CWLIN528
Which three statements are true about services when used with transparent application failover (TAF) for an administrator-managed RAC database?
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.
C: SELECT failover. With SELECT failover, Oracle Net keeps track of all SELECT statements issued during the transaction, tracking how many rows have been fetched back to the client for each cursor associated with a SELECT statement. If the connection to the instance is lost, Oracle Net establishes a connection to another Oracle RAC node and re-executes the SELECT statements, repositioning the cursors so the client can continue fetching rows as if nothing has happened. The SELECT failover approach is best for data warehouse systems that perform complex and time-consuming transactions.
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.
Which two statements are true about initialization parameters for Clustered ASM instances?
C: The default value of the ASM_DISKGROUPS parameter is a NULL string. If the parameter value is NULL or is not specified, then ASM does not mount any disk groups.
E: The ASM_POWER_LIMIT initialization parameter specifies the default power for disk rebalancing in a disk group. The range of values is 0 to 1024.
Which two statements are true about the Global Enqueue Service, Instance Locks, and global enqueues in Oracle 12c RAC?
F: A convert queue is a queue of locks that are waiting to be converted to particular mode, this is the process of changing a lock from one mode to another, even a NULL is a lock. A resource has a lock value block (LVB). The Global Resource Manager (GRM) keeps the lock information valid and correct across the cluster. Oracle 10g release 2 and beyond replaced some latch mechanisms with the mutex approach, claiming that they are faster and more efficient than traditional locking mechanisms.
Which two are characteristics of any node that is part of a Grid Plug and Play (GPnP) Domain in Oracle Clusterware?
Each node participating in a GPnP domain has the following characteristics:
References: https://docs.oracle.com/cd/E11882_01/server.112/e41360/chapter1.htm#NEWFT107
