Oracle 1Z0-068 - Questions & Answers

Explanation:
B: Each volume is individually named and may be configured for a single file system.
D: Oracle ADVM extends Oracle ASM by providing a disk driver interface to Oracle ASM storage allocated as Oracle ADVM volume files.

References:
https://docs.oracle.com/database/121/OSTMG/GUID-B7A61F3B-C22A-4021-A846-F5EA749E79FF.htm#OSTMG32000(SeeNoteandthethirdparafromthetop.)

Explanation:
B: A site can host both primary and standby file systems.
C: If the primary file system has less than 2 GB available free disk space, Oracle ACFS attempts to automatically terminate replication on the primary file system.
D: On the standby system, the remote file server (RFS) receives redo data over the network from the LGWR process and writes the redo data to the standby redo log files.

References:
https://docs.oracle.com/database/121/OSTMG/GUID-8522E0B6-BE6E-4BE3-B7C7-5EA2ED4A602C.htm#OSTMG34600
https://docs.oracle.com/cd/B19306_01/server.102/b14239/log_transport.htm#i1280979

Explanation:
The compatibility parameters COMPATIBLE.ASM and COMPATIBLE.ADVM must be set to 11.2 or higher for the disk group. A high redundancy disk group must contain at least three failure groups.

References:
https://docs.oracle.com/cd/E11882_01/server.112/e18951/asmdiskgrps.htm#OSTMG10072
https://docs.oracle.com/cd/E18283_01/server.112/e16102/asmdiskgrps.htm

Explanation:
You can use the views to obtain information about Oracle Automatic Storage Management Cluster File System (Oracle ACFS). These views are accessible from the Oracle ASM instance.

References:
https://docs.oracle.com/cd/E11882_01/server.112/e18951/asmviews.htm#OSTMG94187

Explanation:
Default template settings depend on the disk group type. The default template for data files for a normal redundancy.

References:
http://docs.oracle.com/cd/E11882_01/server.112/e18951/asmfiles.htm#OSTMG139

Architecturally Oracle Flex Cluster comprises of a Hub and Leaf architecture where in only the Hub nodes will only have direct access to Oracle Cluster Registry (OCR) and Voting Disk (VD). However application can access the database via Leaf nodes without ASM instance NOT running on Leaf nodes. The connection to the database is through Hub making it transparent for the application.

Note:
Hub Nodes are connected among them via private network and have direct access to the shared storage just like previous versions. These nodes are the ones that access the Oracle Cluster Registry (OCR) and Voting Disk (VD) directly.
Leaf Nodes are lighter and are not connected among them, neither accesses the shared storage like the Hub Nodes. Each Leaf Node communicates with the Hub Node that is attached to, and it is connected to the cluster via the Hub Node that is linked to.

References:
http://www.oracle.com/technetwork/articles/database/flexasm-flexcluster-benefits-odb12c-
2177371. html

Explanation:
CD: In addition to ACFS/ADVM and ASM, HANFS also relies on new Oracle 12.1 Clusterware (CRS) resources, namely the HAVIP and the ExportFS.

DE: High Availability Network File Storage (NFS) for Oracle Grid Infrastructure provides uninterrupted service of NFS V2/V3/V4 exported paths by exposing NFS exports on Highly Available Virtual IPs (HAVIP) and using Oracle Clusterware agents to ensure that the HAVIPs and NFS exports are always online.

References:
https://docs.oracle.com/database/121/OSTMG/GUID-4D7A5911-8FA6-47DC-98BB-593B2C90D43E.htm#OSTMG95489
http://www.oracle.com/ocom/groups/public/@otn/documents/webcontent/2011281.pdf

Explanation:

C: Oracle ASM automatically rebalances when the configuration of a disk group changes. By default, the ALTER DISKGROUP statement does not wait until the operation is complete before returning. Query the V$ASM_OPERATION view to monitor the status of this operation.
D: Verify that the rebalance is waiting:
SQL> select * from v$asm_operation where group_number = (select GROUP_NUMBER from v$asm_diskgroup where NAME='BDT');

References:
https://docs.oracle.com/cd/E18283_01/server.112/e16102/asmdiskgrps.htm