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Q61. Examine the memory-related parameters set in the SPFILE of an Oracle database: 

memory_max_target—6G memory_target=5G pga_aggregate_target=500M sga_max_size=0 sga_target=0 

Which statement is true? 

A. Only SGA components are sized automatically-

B. Memory is dynamically re-allocated between the SGA and PGA as needed. 

C. The size of the PGA cannot grow automatically beyond 500 MB. 

D. The value of the MEMORY_TARGET parameter cannot be changed dynamically. 

Answer:


Q62. Which three statements are true about a job chain? 

A. It can contain a nested chain of jobs. 

B. It can be used to implement dependency-based scheduling. 

C. It cannot invoke the same program or nested chain in multiple steps in the chain. 

D. It cannot have more than one dependency. 

E. It can be executed using event-based or time-based schedules. 

Answer: A,B,E 

Reference: http://docs.oracle.com/cd/B28359_01/server.111/b28310/scheduse009.htm#ADMIN12459 


Q63. Which three statements are true concerning the multitenant architecture? 

A. Each pluggable database (PDB) has its own set of background processes. 

B. A PDB can have a private temp tablespace. 

C. PDBs can share the sysaux tablespace. 

D. Log switches occur only at the multitenant container database (CDB) level. 

E. Different PDBs can have different default block sizes. 

F. PDBs share a common system tablespace. 

G. Instance recovery is always performed at the CDB level. 

Answer: B,D,G 

Explanation: B: 

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

user created tablespaces in it. 

* There is one default temporary tablespace for the entire CDB. However, you can create additional temporary tablespaces in individual PDBs. 

D: 

* There is a single redo log and a single control file for an entire CDB 

* A log switch is the point at which the database stops writing to one redo log file and begins writing to another. Normally, a log switch occurs when the current redo log file is completely filled and writing must continue to the next redo log file. 

G: instance recovery The automatic application of redo log records to uncommitted data blocks when an database instance is restarted after a failure. 

Incorrect: Not A: 

* There is one set of background processes shared by the root and all PDBs. – 

* High consolidation density. The many pluggable databases in a single container database share its memory and background processes, letting you operate many more pluggable databases on a particular platform than you can single databases that use the old architecture. 

Not C: There is a separate SYSAUX tablespace for the root and for each PDB. 

Not F: There is a separate SYSTEM tablespace for the root and for each PDB. -


Q64. Examine these two statements: 

Which three are true about the MRKT tablespace? 

A. The MRKT tablespace is created as a small file tablespace, because the file size is less than the minimum required for big file files. 

B. The MRKT tablespace may be dropped if it has no contents. 

C. Users who were using the old default tablespace will have their default tablespaces changed to the MRKT tablespace. 

D. No more data files can be added to the tablespace. 

E. The relative file number of the tablespace is not stored in rowids for the table rows that are stored in the MRKT tablespace. 

Answer: B,C,D 


Q65. Examine the current value for the following parameters in your database instance: 

SGA_MAX_SIZE = 1024M 

SGA_TARGET = 700M 

DB_8K_CACHE_SIZE = 124M 

LOG_BUFFER = 200M 

You issue the following command to increase the value of DB_8K_CACHE_SIZE: 

SQL> ALTER SYSTEM SET DB_8K_CACHE_SIZE=140M; 

Which statement is true? 

A. It fails because the DB_8K_CACHE_SIZE parameter cannot be changed dynamically. 

B. It succeeds only if memory is available from the autotuned components if SGA. 

C. It fails because an increase in DB_8K_CACHE_SIZE cannot be accommodated within SGA_TARGET. 

D. It fails because an increase in DB_8K_CACHE_SIZE cannot be accommodated within SGA_MAX_SIZE. 

Answer:

Explanation: * The SGA_TARGET parameter can be dynamically increased up to the value specified for the SGA_MAX_SIZE parameter, and it can also be reduced. 

* Example: 

For example, suppose you have an environment with the following configuration: 

SGA_MAX_SIZE = 1024M SGA_TARGET = 512M DB_8K_CACHE_SIZE = 128M In this example, the value of SGA_TARGET can be resized up to 1024M and can also be reduced until one or more of the automatically sized components reaches its minimum size. The exact value depends on environmental factors such as the number of CPUs on the system. However, the value of DB_8K_CACHE_SIZE remains fixed at all times at 128M 

* DB_8K_CACHE_SIZE Size of cache for 8K buffers 

* For example, consider this configuration: 

SGA_TARGET = 512M DB_8K_CACHE_SIZE = 128M In this example, increasing DB_8K_CACHE_SIZE by 16 M to 144M means that the 16M is taken away from the automatically sized components. Likewise, reducing DB_8K_CACHE_SIZE by 16M to 112M means that the 16M is given to the automatically sized components. 


Q66. Your multitenant container database (CDB) contains pluggable databases (PDBs), you are connected to the HR_PDB. You execute the following command: 

SQL > CREATE UNDO TABLESPACE undotb01 

DATAFILE ‘u01/oracle/rddb1/undotbs01.dbf’ SIZE 60M AUTOEXTEND ON; 

What is the result? 

A. It executes successfully and creates an UNDO tablespace in HR_PDB. 

B. It falls and reports an error because there can be only one undo tablespace in a CDB. 

C. It fails and reports an error because the CONTAINER=ALL clause is not specified in the command. 

D. It fails and reports an error because the CONTAINER=CURRENT clause is not specified in the command. 

E. It executes successfully but neither tablespace nor the data file is created. 

Answer:

Explanation: Interesting behavior in 12.1.0.1 DB of creating an undo tablespace in a PDB. With the new Multitenant architecture the undo tablespace resides at the CDB level and PDBs all share the same UNDO tablespace. 

When the current container is a PDB, an attempt to create an undo tablespace fails without returning an error. 


Q67. Which three resources might be prioritized between competing pluggable databases when creating a multitenant container database plan (CDB plan) using Oracle Database 

Resource Manager? 

A. Maximum Undo per consumer group 

B. Maximum Idle time 

C. Parallel server limit 

D. CPU 

E. Exadata I/O 

F. Local file system I/O 

Answer: A,C,D 


Q68. You Execute the Following command to create a password file in the database server: 

$ orapwd file = ‘+DATA/PROD/orapwprod entries = 5 ignorecase = N format = 12’ Which two statements are true about the password file? 

A. It records the usernames and passwords of users when granted the DBA role. 

B. It contains the usernames and passwords of users for whom auditing is enabled. 

C. Is used by Oracle to authenticate users for remote database administration. 

D. It records the usernames and passwords of all users when they are added to the OSDBA or OSOPER operating system groups. 

E. It supports the SYSBACKUP, SYSDG, and SYSKM system privileges. 

Answer: C,E 


Q69. Examine the parameters for your database instance: 

Which three statements are true about the process of automatic optimization by using cardinality feedback? 

A. The optimizer automatically changes a plan during subsequent execution of a SQL statement if there is a huge difference in optimizer estimates and execution statistics. 

B. The optimizer can re optimize a query only once using cardinality feedback. 

C. The optimizer enables monitoring for cardinality feedback after the first execution of a query. 

D. The optimizer does not monitor cardinality feedback if dynamic sampling and multicolumn statistics are enabled. 

E. After the optimizer identifies a query as a re-optimization candidate, statistics collected by the collectors are submitted to the optimizer. 

Answer: A,C,D 

Explanation: C: During the first execution of a SQL statement, an execution plan is generated as usual. 

D: if multi-column statistics are not present for the relevant combination of columns, the optimizer can fall back on cardinality feedback. 

(not B)* Cardinality feedback. This feature, enabled by default in 11.2, is intended to improve plans for repeated executions. 

optimizer_dynamic_sampling optimizer_features_enable 

* dynamic sampling or multi-column statistics allow the optimizer to more accurately estimate selectivity of conjunctive predicates. 

Note: 

* OPTIMIZER_DYNAMIC_SAMPLING controls the level of dynamic sampling performed by the optimizer. Range of values. 0 to 10 

* Cardinality feedback was introduced in Oracle Database 11gR2. The purpose of this feature is to automatically improve plans for queries that are executed repeatedly, for which the optimizer does not estimate cardinalities in the plan properly. The optimizer may misestimate cardinalities for a variety of reasons, such as missing or inaccurate statistics, or complex predicates. Whatever the reason for the misestimate, cardinality feedback may be able to help. 


Q70. 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: 

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. 

Answer: A,B,E 

Explanation: A: To implement Temporal Validity(TV), 12c offers the option to have two date columns in that table which is having TV enabled using the new clause Period For in the Create Table for the newly created tables or in the Alter Table for the existing ones. The columns that are used can be defined while creating the table itself and will be used in the Period For clause or you can skip having them in the table’s definition in the case of which, the Period For clause would be creating them internally. 

E: ENABLE_AT_VALID_TIME Procedure 

This procedure enables session level valid time flashback.