Oracle Oracle Database 1Z0-067 Questions & Answers

• Question 241:

  Examine the initialization parameter that is set in the PFILE:

  DB_CREATE_FILE_DEST ='/u01/app/oracle/oradata/'

  You execute the following command to create theCDB1. container database (CDB):

  SQL>CREATE DATABASE CDB1 DEFAULT TABLESPACE users DEFAULT TEMPORARY TABLESPACE temp UNDO TABLESPACE undotbsl ENABLE PLUGGABLE DATABASE SEED SYSTEM DATAFILES SIZE125M AUTOEXTEND ON NEXT 10M MAXSIZE UNLIMITED SYS AUX DATAFILES SIZE 100M;

  Which three statements are true?

  A. It creates a multitenant container database with a root and a seed pluggable database (PDB) that are opened in read-write and read-only modes, respectively.

  B. The files created for both the root and seed databases use Oracle Managed Files (OMF).

  C. It creates a multitenant container database with the root and seed databases opened and one PDB mounted.

  D. It sets the users tablespace as the default for both the root and seed databases.

  E. undotbs1 is used as the undo tablespace for both the root and seed databases.

  F. It creates a multitenant container database with the root database opened and the seed database mounted.

  Correct Answer: ABE

  The seed actually doesn't use anything since it's read-only, but any PDB created from the seed will use the undotbs1 undo tablespace. Each PDB can have its own default tablespace, but cannot change the undo tablespace.

• Question 242:

  Which two resources might be prioritized between competing pluggable databases (PDBs) when creating a multitenant container database (COB) plan using Oracle Database Resource Manager?

  A. maximum undo per consumer group

  B. maximum idle time for a session in a PDB

  C. parallel server limit

  D. CPU

  E. maximum number of sessions for a PDB

  Correct Answer: CD

• Question 243:

  Which three types of failures are detected by the Data Recovery Advisor (DRA)?

  A. loss of a non-critical data file

  B. loss of a control file

  C. physical data block corruption

  D. logical data block corruption

  E. loss of an archived redo log file

  Correct Answer: BCD

  Reference: https://docs.oracle.com/cd/B28359_01/backup.111/b28270/rcmrepai.htm#BRADV89716

• Question 244:

  You want to capture column group usage and gather extended statistics for better cardinality estimates for the customers table in the SH schema.

  Examine the following steps:

  1. Issue the SELECTDBMS_STATS. CREATE_EXTENDED_STATS(`SH', 'CUSTOMERS')from dual

  statement.

  2.Execute the dbms_stats.seed_col_usage (null,`SH',500) procedure.

  3.Execute the required queries on the customers table.

  4.Issue the select dbms_stats.reportwcol_usage(`SH', 'customers') from dual statement.

  Identify the correct sequence of steps.

  A. 3, 2, 1, 4

  B. 2, 3, 4, 1

  C. 4, 1, 3, 2

  D. 3, 2, 4, 1

  Correct Answer: B

  Step 1 (2). Seed column usage Oracle must observe a representative workload, in order to determine the appropriate column groups. Using the new procedure DBMS_STATS.SEED_COL_USAGE, you tell Oracle how long it should observe the workload. Step 2: (3) You don't need to execute all of the queries in your work during this window. You can simply run explain plan for some of your longer running queries to ensure column group information is recorded for these queries. Step 3. (1) Create the column groups At this point you can get Oracle to automatically create the column groups for each of the tables based on the usage information captured during the monitoring window. You simply have to call the DBMS_STATS.CREATE_EXTENDED_STATS function for each table.This function requires just two arguments, the schema name and the table name. From then on, statistics will be maintained for each column group whenever statistics are gathered on the table.

  Note:

  *

  DBMS_STATS.REPORT_COL_USAGE reports column usage information and records all the SQL

  operations the database has processed for a given object.

  *

  The Oracle SQL optimizer has always been ignorant of the implied relationships between data columns

  within the same table. While the optimizer has traditionally analyzed the distribution of values within a

  column, he does not collect value- based relationships between columns.

  *

  Creating extended statistics

  Here are the steps to create extended statistics for related table columns

  withdbms_stats.created_extended_stats:

  1 - The first step is to create column histograms for the related columns.

  2 ?Next, we run dbms_stats.create_extended_stats to relate the columns together.

  Unlike a traditional procedure that is invoked via an execute ("exec") statement, Oracle extended statistics

  are created via a select statement.

• Question 245:

  You create a table with the period for clause to enable the use of the Temporal Validity feature of Oracle Database 12c.

  Examine the table definition:

  create table employees (empno number, salary number, deptid number, name varchar2(100), period for employee_time);

  Which three statements are true concerning the use of the Valid Time Temporal feature for the EMPLOYEES table?

  A. The valid time columns employee_time_start and employee_time_end are automatically created.

  B. The same statement may filter on both transaction time and valid temporal time by using the AS OF TIMESTAMP and PERIOD FOR clauses.

  C. The valid time columns are not populated by the Oracle Server automatically.

  D. The valid time columns are visible by default when the table is described.

  E. Setting the session valid time using DBMS_FLASHBACK_ARCHIVE.ENABLE_AT_VALID_TIME sets the visibility for data manipulation language (DML), data definition language (DDL), and queries performed by the session.

  Correct Answer: ABC

  Reference: https://docs.oracle.com/database/121/ARPLS/d_flashb_archive.htm#ARPLS74552

• Question 246:

  Which two statements are true when row-archival management is enabled?

  A. Visibility of the ORA_ARCHIVE_STATE column is controlled by the row archival visibility session parameter.

  B. The ORA_ARCHIVE_STATE column is updated manually or by a program that can reference activity tracking columns, to indicate that a row is no longer considered active.

  C. The row archival visibility session parameter defaults to all rows.

  D. The ORA_ARCHIVE_STATE column is visible if it is referenced in the select list of a query.

  E. The ORA_ARCHIVE_STATE column is updated automatically by the database based on activity tracking columns, to indicate that a row is no longer considered active.

  Correct Answer: BD

• Question 247:

  You want to consolidate backup information and centrally manage backup and recovery scripts for multiple databases running in your organization.

  Which two backup solutions can be used?

  A. RMAN recovery catalog

  B. RMAN Media Management Library

  C. Enterprise Manager Cloud Control

  D. Enterprise Manager Database Express

  E. Oracle Secure Backup

  Correct Answer: AC

  Enterprise Manager allows a centralized control of database backups. It is possible to set up and schedule RMAN backups for all the databases in a large company, use a consistent backup strategy, and refer to all past RMAN output logs at any time, since they are stored in the Enterprise Manager Cloud Control repository. There is no need to use a central RMAN catalog, because information about the backups is centrally available from Enterprise Manager. And with the group backup feature new to Enterprise Manager Cloud Control 12c, it can be even faster to set up RMAN backups for all the databases-even if there are thousands-that are part of an Enterprise Manager group. References: http://www.oracle.com/technetwork/articles/oem/havewala-rman-em12c-2104270.html

• Question 248:

  You want RMAN to make duplicate copies of data files when using the backup command.

  What must you set using the RMAN configure command to achieve this?

  A. MAXSETSIZE TO 2;

  B. DEVICE TYPE DISK PARALLELISM 2 BACKUP TYPE TO BACKUPSET;

  C. CHANNEL DEVICE TYPE DISK FORMAT '/disk1/%U' , '/disk2/%U';

  D. DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 2;

  Correct Answer: D

  Configuring Backup Duplexing You can use the CONFIGURE ... BACKUP COPIES command to specify how many copies of each backup piece should be created on the specified device type for the specified type of file. This type of backup is known as a duplexed backup set. The CONFIGURE settings for duplexing only affect backups of datafiles, control files, and archived logs into backup sets, and do not affect image copies. NOT A The CONFIGURE MAXSETSIZE command limits the size of backup sets created on a channel. This CONFIGURE setting applies to any channel, whether manually allocated or configured, when the BACKUP command is used to create backup sets. The default value is given in bytes and is rounded down to the lowest kilobyte value. Reference: http://docs.oracle.com/cd/B28359_01/backup.111/b28270/rcmconfa.htm#BRADV137

• Question 249:

  In your database, the tbs percent used parameter is set to 60 and the tbs percent free parameter is set to

  20.

  Which two storage-tiering actions might be automated when using Information Lifecycle Management (ILM) to automate data movement?

  A. The movement of all segments to a target tablespace with a higher degree of compression, on a different storage tier, when the source tablespace exceeds tbs percent used

  B. Setting the target tablespace to read-only after the segments are moved

  C. The movement of some segments to a target tablespace with a higher degree of compression, on a different storage tier, when the source tablespace exceeds TBS percent used

  D. Taking the target tablespace offline after the segments are moved

  E. The movement of some blocks to a target tablespace with a lower degree of compression, on a different storage tier, when the source tablespace exceeds tbs percent used

  Correct Answer: BC

  The threshold for activating tiering policies is based on two parameters: TBS PERCENT USED TBS PERCENT FREE Both values can be controlled by the DBMS_ILM_ADMIN package. TBS PERCENT USED and TBS PERCENT FREE default to 85 and 25, respectively. Hence, whenever the source tablespace's usage percentage goes beyond 85 percent, any tiering policy specified on its objects will be executed and objects will be moved to the target tablespace until the source tablespace becomes at least 25 percent free. Note that it is possible to add a custom condition to tiering policies to enable movement of data based on conditions other than how full the tablespace is. In addition, the READ ONLY option must be explicitly specified for the target tablespace.

• Question 250:

  A database is running in archive log mode. The database contains locally managed tablespaces. Examine the RMAN command:

  RMAN> BACKUP AS COMPRESSED BACKUPSET SECTION SIZE 1024M DATABASE;

  Which statement is true about the execution of the command?

  A. The backup succeeds only if all the tablespaces are locally managed.

  B. The backup succeeds only if the RMAN default device for backup is set to disk.

  C. The backup fails because you cannot specify section size for a compressed backup.

  D. The backup succeeds and only the used blocks are backed up with a maximum backup piece size of 1024 MB.

  Correct Answer: D

  COMPRESSED enables binary compression.

  RMAN compresses the data written into the backup set to reduce the overall size of the backup set. All backups that create backup sets can create compressed backup sets. Restoring compressed backup sets is no different from restoring uncompressed backup sets. RMAN applies a binary compression algorithm as it writes data to backup sets. This compression is similar to the compression provided by many media manager vendors. When backing up to a locally attached tape device, compression provided by the media management vendor is usually preferable to the binary compression provided by BACKUP AS COMPRESSED BACKUPSET. Therefore, use uncompressed backup sets and turn on the compression provided by the media management vendor when backing up to locally attached tape devices. You should not use RMAN binary compression andmedia manager compression together. Some CPU overhead is associated with compressing backup sets. If the target database is running at or near its maximum load, then you may find the overhead unacceptable. In most other circumstances, compressing backup sets saves enough disk space to be worth the CPU overhead. SECTION SIZE sizeSpec Specifies the size of each backup section produced during a data file backup. By setting this parameter, RMAN can create a multisection backup. In a multisection backup, RMAN creates a backup piece that contains one file section, which is a contiguous range of blocks in a file. All sections of a multisection backup are the same size. You can create a multisection backup for a data file, but not a data file copy. File sections enable RMAN to create multiple steps for the backup of a single large data file. RMAN channels can process each step independently and in parallel, with each channel producing one section of a multisection backup set. If you specify a section size that is larger than the size of the file, then RMAN does not use multisection backup for the file. If you specify a small section size that would produce more than 256 sections, then RMAN increases the section size to a value that results in exactly 256 sections. Depending on where you specify this parameter in the RMAN syntax, you can specify different section sizes for different files in the same backup job. Note: You cannot use SECTION SIZE with MAXPIECESIZE or with INCREMENTAL LEVEL 1.