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Latest and Most Accurate Oracle 1z0-068 Dumps Exam Q&As:
Which three statements are true about services when used with transparent application failover (TAF) for an administrator-managed RAC database?
A. TAF-enabled sessions fail over to a surviving instance accepting logins for the service.
B. TAF-settings for the service override TAF settings in TNS entry used by the client.
C. TAF can restart a query or a transaction after failover.
D. The TAF settings for a client connections overrides any TAF settings in the service definition.
E. TAF PRECONNECT requires configuration for the service and inthe client TNS entry.
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. SESSIONfailover 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 mechanismdubbed Transparent Application Failover. TAF allows the DBA to configure the type and method of failover for each Oracle Net client.
Examine this query and output:
SQL> select order_flag, cache_size, session_flag, keep_value,
2 from user_sequences where sequence_name = ‘SEQ1’;
O CACHE_SIZE S K
— ——————- — —
Y 10 N N
Performance analysis revealed severe SQ enqueue contention on the SEQ1 sequence.
The SEQ1 sequence is incremented from all instances equally and is frequently used.
Which two statements should you execute to reduce SQ enqueue contention?
A. alter sequence seq1 cache 10000;
B. alter sequence seq1 order;
C. alter sequence seq1 noorder;
D. exec sys.dbms_shared_pool.keep (‘SEQ1’, ‘Q’)
E. alter sequence seq1 keep;
A: Use cache.
D: The KEEP procedure keepsan object in the shared pool. Once an object has been kept in the shared pool, it is not subject to aging out of the pool. This may be useful for frequently used large objects. When large objects are brought into the shared pool, several objects may needto be aged out to create a contiguous area large enough.
enq: SQ – contention
New Updated 1z0-068 Exam Questions 1z0-068 PDF dumps 1z0-068 practice exam dumps: https://www.dumpsschool.com/1z0-068-exam-dumps.html (91 Questions)
Examine this command to create a volume in the DATA disk group:
SQL>ALTER DISKGROUP DATA ADD VOLUME vo11 SIZE 10g HIGH
The DATA disk group has 50GB free space.
Which two are prerequisites for successful execution of this command?
A. COMAPTIBLE.ASM and COMPATIBLE.ADVM must be set to 11.2 or higher for the DATA disk group.
B. The DATA disk group must not be created with external redundancy.
C. The DATA disk group must not contain any other volume.
D. The DATA disk group must have at least three failure groups.
E. The DATA disk group must have an AU size of 1MB.
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.
Which two statements are true about v$asm – views in clustered environment?
A. They exist both in ASM and RDBMS instances, and display the same output.
B. Their names can be seen in dict when connected to an ASM instance.
C. Their names can be seen in v$fixed_table when connected to an instance of any type that is started.
D. They exist in both in ASM and RDBSM instances, but they can display different outputs depending on the instance type.
E. gv$asm_attribute can be used to display the ASM_POWER_LIMIT attribute of all ASM instances in the cluster.
You can use the views to obtain information about Oracle Automatic Storage Management Cluster File System (OracleACFS). These views are accessible from the Oracle ASM instance.
Which two statements are true about ASM default templates?
A. Default data file templates are only created by ASM when a normal redundancy disk group is created.
B. Default template settings for redundancy depends on the disk group redundancy.
C. Default templates for a disk group can be modified.
D. Default template setting for striping depends on disk group redundancy.
E. Templates may be shared across disk groups.
Default template settings depend on the diskgroup type. The default template for data files for a normal redundancy.
Which three statements are true regarding Flex ASM on a four-node cluster consisting of three-hub nodes and a leaf node?
A. An ASM instance and database instances can coexist on the same hub node.
B. A database instance on a hub node canbe a client of an ASM instance running on any leaf node.
C. A database instance on a hub node can be a client of an ASM instance running on any hub node.
D. A database instance on a leaf node can be a client of an ASM instance running on any hub node.
E. A database instance on a hub node uses an ASM instance as an I/O server when requesting I/O to diskgroups.
F. ASM Cluster File System (ASFS) can only be deployed on hub nodes.
Architecturally Oracle Flex Cluster comprises of a Hub and Leafarchitecture 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.
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.