Oracle Oracle Database 1Z0-060 Questions & Answers

• Question 151:

  Examine the contents of SQL loader control file:

  

  Which three statements are true regarding the SQL* Loader operation performed using the control file?

  A. An EMP table is created if a table does not exist. Otherwise, if the EMP table is appended with the loaded data.

  B. The SQL* Loader data file myfile1.dat has the column names for the EMP table.

  C. The SQL* Loader operation fails because no record terminators are specified.

  D. Field names should be the first line in the both the SQL* Loader data files.

  E. The SQL* Loader operation assumes that the file must be a stream record format file with the normal carriage return string as the record terminator.

  Correct Answer: ABE

  A: The APPEND keyword tells SQL*Loader to preserve any preexisting data in the table. Other options allow you to delete preexisting data, or to fail with an error if the table is not empty to begin with.

  B (not D): Note:

  * SQL*Loader-00210: first data file is empty, cannot process the FIELD NAMES record

  Cause: The data file listed in the next message was empty. Therefore, the FIELD NAMES FIRST FILE

  directive could not be processed.

  Action: Check the listed data file and fix it. Then retry the operation

  E:

  *

  A comma-separated values (CSV) (also sometimes called character-separated values, because the

  separator character does not have to be a comma) file stores tabular data (numbers and text) in plain-text

  form. Plain text means that the file is a sequence of characters, with no data that has to be interpreted

  instead, as binary numbers. A CSV file consists of any number of records, separated by line breaks of

  some kind; each record consists of fields, separated by some other character or string, most commonly a

  literal comma or tab. Usually, all records have an identical sequence of fields.

  *

  Fields with embedded commas must be quoted.

  Example:

  1997,Ford,E350,"Super, luxurious truck"

  *

  SQL*Loader is a bulk loader utility used for moving data from external files into the Oracle database.

  Note:

• Question 152:

  You execute a DROP USER CASCADE on an Oracle 11g release 1 database and immediately realized that you forgot to copy the OCA.EXAM_RESULTS table to the OCP schema.

  RECYCLE_BIN was enabled before the DROP USER was executed and the OCP user has been granted the FLASHBACK ANY TABLE system privilege.

  What is the quickest way to recover the contents of the OCA.EXAM_RESULTS table to the OCP schema?

  A. Execute FLASHBACK TABLE OCA.EXAM_RESULTS TO BEFORE DROP RENAME TO OCP.EXAM_RESULTS; connected as SYSTEM.

  B. Recover the table using traditional Tablespace Point In Time Recovery.

  C. Recovery the table using Database Point In Time Recovery.

  D. Execute FLASHBACK TABLE OCA.EXAM_RESULTS TO BEFORE DROP RENAME TO EXAM_RESULTS; connected as the OCP user.

  Correct Answer: D

• Question 153:

  In your multitenant container database (CDB) that contains pluggable databases (PDBs), the HR user executes the following commands to create and grant privileges on a procedure:

  

  How can you prevent users having the EXECUTE privilege on the CREATE_TEST procedure from inserting values into tables on which they do not have any privileges?

  A. Create the CREATE_TEST procedure with definer's rights.

  B. Grant the EXECUTE privilege to users with GRANT OPTION on the CREATE_TEST procedure.

  C. Create the CREATE_TEST procedure with invoker's rights.

  D. Create the CREATE_TEST procedure as part of a package and grant users the EXECUTE privilege the package.

  Correct Answer: C

  If a program unit does not need to be executed with the escalated privileges of the definer, you should specify that the program unit executes with the privileges of the caller, also known as the invoker. Invoker's rights can mitigate the risk of SQL injection.

  Incorrect Answers:

  A: By default, stored procedures and SQL methods execute with the privileges of their owner, not their current user. Such definer-rights subprograms are bound to the schema in which they reside. not B: Using the GRANT option, a user can grant an Object privilege to another user or to PUBLIC.

• Question 154:

  You created a new database using the "create database" statement without specifying the "ENABLE PLUGGABLE" clause.

  What are two effects of not using the "ENABLE PLUGGABLE database" clause?

  A. The database is created as a non-CDB and can never contain a PDB.

  B. The database is treated as a PDB and must be plugged into an existing multitenant container database (CDB).

  C. The database is created as a non-CDB and can never be plugged into a CDB.

  D. The database is created as a non-CDB but can be plugged into an existing CDB.

  E. The database is created as a non-CDB but will become a CDB whenever the first PDB is plugged in.

  Correct Answer: AD

  A (not B, not E): The CREATE DATABASE ... ENABLE PLUGGABLE DATABASE SQL statement creates a new CDB. If you do not specify the ENABLE PLUGGABLE DATABASE clause, then the newly created database is a non-CDB and can never contain PDBs.

  D: You can create a PDB by plugging in a Non-CDB as a PDB. The following graphic depicts the options for creating a PDB:

  

  Incorrect Answers:

  E: For the duration of its existence, a database is either a CDB or a non-CDB. You cannot transform a non-CDB into a CDB or vice versa. You must define a database as a CDB at creation, and then create PDBs within this CDB.

• Question 155:

  What is the effect of specifying the "ENABLE PLUGGABLE DATABASE" clause in a "CREATE DATABASE" statement?

  A. It will create a multitenant container database (CDB) with only the root opened.

  B. It will create a CDB with root opened and seed read only.

  C. It will create a CDB with root and seed opened and one PDB mounted.

  D. It will create a CDB that must be plugged into an existing CDB.

  E. It will create a CDB with root opened and seed mounted.

  Correct Answer: B

  *

  The CREATE DATABASE ... ENABLE PLUGGABLE DATABASE SQL statement creates a new CDB. If you do not specify the ENABLE PLUGGABLE DATABASE clause, then the newly created database is a non-CDB and can never contain PDBs.

  Along with the root (CDB$ROOT), Oracle Database automatically creates a seed PDB (PDB$SEED). The following graphic shows a newly created CDB:

  *

  Creating a PDB Rather than constructing the data dictionary tables that define an empty PDB from scratch, and then populating its Obj$ and Dependency$ tables, the empty PDB is created when the CDB is created. (Here, we use empty to mean containing no customer-created artifacts.) It is referred to as the seed PDB and has the name PDB$Seed. Every CDB non-negotiably contains a seed PDB; it is non-negotiably always open in read-only mode. This has no conceptual significance; rather, it is just an optimization device. The create PDB operation is implemented as a special case of the clone PDB operation.

  

• Question 156:

  You create a new pluggable database, HR_PDB, from the seed database.

  Which three tablespaces are created by default in HR_PDB? (Choose three.)

  A. SYSTEM

  B. SYSAUX

  C. EXAMPLE

  D. UNDO

  E. TEMP

  F. USERS

  Correct Answer: ABE

  *

  A PDB would have its SYSTEM, SYSAUX, TEMP tablespaces. It can also contains other user created tablespaces in it. *

  *

  Oracle Database creates both the SYSTEM and SYSAUX tablespaces as part of every database.

  *

  tablespace_datafile_clauses

  Use these clauses to specify attributes for all data files comprising the SYSTEM and SYSAUX tablespaces in the seed PDB.

  Incorrect Answers:

  D: a PDB can not have an undo tablespace. Instead, it uses the undo tablespace belonging to the CDB.

  Note:

  * Example: CONN pdb_admin@pdb1

  SELECT tablespace_name FROM dba_tablespaces;

  TABLESPACE_NAME

  SYSTEM SYSAUX TEMP USERS

  SQL>

• Question 157:

  Which two statements are true about variable extent size support for large ASM files?

  A. The metadata used to track extents in SGA is reduced.

  B. Rebalance operations are completed faster than with a fixed extent size

  C. An ASM Instance automatically allocates an appropriate extent size.

  D. Resync operations are completed faster when a disk comes online after being taken offline.

  E. Performance improves in a stretch cluster configuration by reading from a local copy of an extent.

  Correct Answer: AC

  A: Variable size extents enable support for larger ASM datafiles, reduce SGA memory requirements for very large databases (A), and improve performance for file create and open operations.

  C: You don't have to worry about the sizes; the ASM instance automatically allocates the appropriate extent size.

  Note:

  *

  The contents of ASM files are stored in a disk group as a set, or collection, of data extents that are stored

  on individual disks within disk groups. Each extent resides on an individual disk. Extents consist of one or

  more allocation units (AU).

  To accommodate increasingly larger files, ASM uses variable size extents.

  *

  The size of the extent map that defines a file can be smaller by a factor of 8 and 64 depending on the file

  size. The initial extent size is equal to the allocation unit size and it increases by a factor of 8 and 64 at

  predefined thresholds. This feature is automatic for newly created and resized datafiles when the disk

  group compatibility attributes are set to Oracle Release 11 or higher.

• Question 158:

  Examine the following query output:

  

  You issue the following command to import tables into the hr schema:

  $ > impdp hr/hr directory = dumpdir dumpfile = hr_new.dmp schemas=hr TRANSFORM=DISABLE_ARCHIVE_LOGGING: Y

  Which statement is true?

  A. All database operations performed by the impdp command are logged.

  B. Only CREATE INDEX and CREATE TABLE statements generated by the import are logged.

  C. Only CREATE TABLE and ALTER TABLE statements generated by the import are logged.

  D. None of the operations against the master table used by Oracle Data Pump to coordinate its activities are logged.

  Correct Answer: C

  Note from Oracle Documentation: With redo logging disabled, the disk space required for redo logs during an Oracle Data Pump import will be smaller. However, to ensure recovery from media failure, the DBA should do an RMAN backup after the import completes. Even with this parameter specified, there is still redo logging for other operations of Oracle Data Pump. This includes all CREATE and ALTER statements, except CREATE INDEX, and all operations against the master table used by Oracle Data Pump during the import.

• Question 159:

  You notice a performance change in your production Oracle database and you want to know which change has made this performance difference.

  You generate the Compare Period Automatic Database Diagnostic Monitor (ADDM) report to further investigation.

  Which three findings would you get from the report?

  A. It detects any configuration change that caused a performance difference in both time periods.

  B. It identifies any workload change that caused a performance difference in both time periods.

  C. It detects the top wait events causing performance degradation.

  D. It shows the resource usage for CPU, memory, and I/O in both time periods.

  E. It shows the difference in the size of memory pools in both time periods.

  F. It gives information about statistics collection in both time periods.

  Correct Answer: ABD

  Keyword: shows the difference.

  *

  Full ADDM analysis across two AWR snapshot periods Detects causes, measure effects, then correlates them Causes: workload changes, configuration changes Effects: regressed SQL, reach resource limits (CPU, I/O, memory, interconnect) Makes actionable recommendations along with quantified impact

  *

  Identify what changed / Configuration changes, workload changes

  *

  Performance degradation of the database occurs when your database was performing optimally in the past, such as 6 months ago, but has gradually degraded to a point where it becomes noticeable to the users. The Automatic Workload Repository (AWR) Compare Periods report enables you to compare database performance between two periods of time.

  While an AWR report shows AWR data between two snapshots (or two points in time), the AWR Compare Periods report shows the difference (ABE) between two periods (or two AWR reports with a total of four snapshots). Using the AWR Compare Periods report helps you to identify detailed performance attributes and configuration settings that differ between two time periods.

• Question 160:

  Examine the parameter for your database instance:

  

  You generated the execution plan for the following query in the plan table and noticed that the nested loop join was done. After actual execution of the query, you notice that the hash join was done in the execution plan:

  

  Identify the reason why the optimizer chose different execution plans.

  A. The optimizer used a dynamic plan for the query.

  B. The optimizer chose different plans because automatic dynamic sampling was enabled.

  C. The optimizer used re-optimization cardinality feedback for the query.

  D. The optimizer chose different plan because extended statistics were created for the columns used.

  Correct Answer: B

  * optimizer_dynamic_sampling OPTIMIZER_DYNAMIC_SAMPLING controls both when the database gathers dynamic statistics, and the size of the sample that the optimizer uses to gather the statistics. Range of values0 to 11