Download Oracle Database 12c: Installation and Administration.1z0-062.PracticeTest.2019-04-15.217q.vcex

Vendor: Oracle
Exam Code: 1z0-062
Exam Name: Oracle Database 12c: Installation and Administration
Date: Apr 15, 2019
File Size: 2 MB
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Demo Questions

Question 1
As a user of the ORCL database, you establish a database link to the remote HQ database such that all users in the ORCL database may access tables only from the SCOTT schema in the HQ database. SCOTT’s password is TIGER. The service mane “HQ” is used to connect to the remote HQ database. 
Which command would you execute to create the database link?
  1. CREATE DATABASE LINK HQ USING 'HQ';
  2. CREATE DATABASE LINK HQ CONNECT TO CURRENT_USER USING ‘HQ’;
  3. CREATE PUBLIC DATABASE LINK HQ CONNECT TO scott IDENTIFIED BY tiger USING 'HQ';
  4. CREATE DATABASE LINK HQ CONNECT TO scott IDENTIFIED BY tiger USING 'HQ';
Correct answer: C
Question 2
What happens if a maintenance window closes before a job that collects optimizer statistics completes?
  1. The job is terminated and the gathered statistics are not saved.
  2. The job is terminated but the gathered statistics are not published.
  3. The job continues to run until all statistics are gathered.
  4. The job is terminated and statistics for the remaining objects are collected the next time the maintenance window opens.
Correct answer: D
Explanation:
The stop_on_window_close attribute controls whether the GATHER_STATS_JOB continues when the maintenance window closes. The default setting for the stop_on_window_close attribute is TRUE, causing Scheduler to terminate GATHER_STATS_JOB when the maintenance window closes. The remaining objects are then processed in the next maintenance window. References: https://docs.oracle.com/cd/B19306_01/server.102/b14211/stats.htm#g49431
The stop_on_window_close attribute controls whether the GATHER_STATS_JOB continues when the maintenance window closes. The default setting for the stop_on_window_close attribute is TRUE, causing Scheduler to terminate GATHER_STATS_JOB when the maintenance window closes. The remaining objects are then processed in the next maintenance window. 
References: https://docs.oracle.com/cd/B19306_01/server.102/b14211/stats.htm#g49431
Question 3
You plan to create a database by using the Database Configuration Assistant (DBCA), with the following specifications:
  • Applications will connect to the database via a middle tier. 
  • The number of concurrent user connections will be high. 
  • The database will have mixed workload, with the execution of complex BI queries scheduled at night. 
Which DBCA option must you choose to create the database?
  1. a General Purpose database template with default memory allocation
  2. a Data Warehouse database template, with the dedicated server mode option and AMM enabled
  3. a General Purpose database template, with the shared server mode option and Automatic Memory Management (AMM) enabled
  4. a default database configuration
Correct answer: C
Explanation:
References:
References:
Question 4
Which two statements are true about the logical storage structure of an Oracle database? (Choose two.)
  1. An extent contains data blocks that are always physically contiguous on disk.
  2. An extent can span multiple segments.
  3. Each data block always corresponds to one operating system block.
  4. It is possible to have tablespaces of different block sizes.
  5. A data block is the smallest unit of I/O in data files.
Correct answer: DE
Explanation:
Question 5
Which two statements correctly describe the relationship between data files and logical database structures? (Choose two.)
  1. A segment cannot span data files.
  2. A data file can belong to only one tablespace.
  3. An extent cannot span data files.
  4. The size of an Oracle data block in a data file should be the same as the size of an OS block.
Correct answer: BC
Explanation:
A single extent can never span data files. https://docs.oracle.com/database/121/CNCPT/logical.htm#CNCPT1095
A single extent can never span data files. 
https://docs.oracle.com/database/121/CNCPT/logical.htm#CNCPT1095
Question 6
Which statement is true about the Log Writer process?
  1. It writes when it receives a signal from the checkpoint process (CKPT).
  2. It writes concurrently to all members of multiplexed redo log groups.
  3. It writes after the Database Writer process writes dirty buffers to disk.
  4. It writes when a user commits a transaction.
Correct answer: D
Explanation:
References:http://docs.oracle.com/cd/B19306_01/server.102/b14220/process.htm (see log writer process (LGWR))
References:
http://docs.oracle.com/cd/B19306_01/server.102/b14220/process.htm (see log writer process (LGWR))
Question 7
Which two tasks can be performed on an external table? (Choose two.)
  1. partitioning the table
  2. creating an invisible index
  3. updating the table by using an update statement
  4. creating a public synonym
  5. creating a view
Correct answer: DE
Explanation:
You can, for example select, join, or sort external table data. You can also create views and synonyms for external tables. However, no DML operations (UPDATE, INSERT, or DELETE) are possible, and no indexes can be created, on external tables. http://docs.oracle.com/cd/B28359_01/server.111/b28310/tables013.htm#ADMIN01507
You can, for example select, join, or sort external table data. You can also create views and synonyms for external tables. However, no DML operations (UPDATE, INSERT, or DELETE) are possible, and no indexes can be created, on external tables. 
http://docs.oracle.com/cd/B28359_01/server.111/b28310/tables013.htm#ADMIN01507
Question 8
Which three statements are true about a job chain? (Choose three.)
  1. It can contain a nested chain of jobs.
  2. It can be used to implement dependency-based scheduling.
  3. It cannot invoke the same program or nested chain in multiple steps in the chain.
  4. It cannot have more than one dependency.
  5. It can be executed using event-based or time-based schedules.
Correct answer: ABE
Explanation:
Question 9
The HR user receives the following error while inserting data into the sales table:
  
On investigation, you find that the users tablespace uses Automatic Segment Space Management (ASSM). It is the default tablespace for the HR user with an unlimited quota on it. 
Which two methods would you use to resolve this error? (Choose two.)
  1. Altering the data file associated with the USERS tablespace to extend automatically
  2. Adding a data file to the USERS tablespace
  3. Changing segment space management for the USERS tablespace to manual
  4. Creating a new tablespace with autoextend enabled and changing the default tablespace of the HR user to the new tablespace
  5. Enabling resumable space allocation by setting the RESUMABLE_TIMEOUT parameter to a nonzero value
Correct answer: AB
Question 10
Which three factors influence the optimizer's choice of an execution plan? (Choose three.)
  1. the optimizer_mode initialization parameter
  2. operating system (OS) statistics
  3. cardinality estimates
  4. object statistics in the data dictionary
  5. fixed baselines
Correct answer: ACD
Explanation:
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