Oracle 1z0-067 test questions for 1z0-067 test engine (Jun 2016)
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Abreast of the times 1z0-067 Simple Questions Latest Practice Test Questions VCE PDF Dumps
Qustion No. 1
In which situation can you use Flashback Database?
A. when undoing a shrink data file operation
B. when retrieving a dropped tablespace
C. when returning to a point in time before the restoration or re-creation of a control file
D. when returning to a point in time before the most recent open resetlogs operation
Answer: B,C
Reference:http://docs.oracle.com/cd/B28359_01/backup.111/b28273/rcmsynta023.htm(pre requisites, third para)
Qustion No. 2
The CATDB12C database contains an Oracle Database 12c catalog schema owned by the rci2c user.
The CATD3H database contains an Oracle Database Ug catalog schema owned by the rch user.
A database with dbid=H2324I is registered in the catdbII catalog. Both the recovery catalog databases are open.
In the CATD3i2c database, you execute the commands:
: r-ar.
RKAN> CONNECT CATALOG rci2c/passI2c@catdbi2c
RKAN> IMPORT CATALOG rcii/pwdcatUQcatdfoil DBI2=142324i;
What is the outcome of the import?
A. It fails because the target database and recovery catalog database are of different versions.
B. It succeeds and all global scripts in the rci: catalog that have the same name as existing global scripts in the RCI2C catalog are automatically renamed.
C. It succeeds but the database is not automatically registered in the rc:2c catalog.
D. It fails because RMAN is not connected to the target database with r3:T=:42324:.
Answer: B
Qustion No. 3
In the SPFILE, UNDOJTABLESPACEis Set to UNDOTBS.
You rename the undotbs undo tablespace:
ALTER TABLESPACE undotbs RENAME TO undotbs_old;
Which statement is true?
A. The tablespace will be renamed but the data file headers will not be updated.
B. The statement will fail because you cannot rename an undo tablespace.
C. The tablespace will be renamed and all the changes will be logged in the alert log.
D. The tablespace will be renamed and a message written to the alert log indicating that you should change the corresponding initialization parameter.
E. You must set the undo_tablespace parameter to some other tablespace name before renaming undotbs.
Answer: C,E
Qustion No. 4
Which three requirements must be met before a tablespace can be transported across different platforms?
A. Both the source and target databases must use the same character set.
B. The platforms of both the source and target databases must have the same endian format.
C. The compatible parameter value must be the same in the source and target databases.
D. The minimum compatibility level for both the source and target databases must be
10.0.0.
E. The tablespace to be transported must be in read-only mode.
Answer: B,C,D
Qustion No. 5
Examine the parameters for your database instance:
NAMETYPEVALUE
optimizer_adaptive_reporting_onlybooleanFALSE
optimizer_capture_sql_plan_baselinesbooleanFALSE
optimizer_dynamic_samplinginteger2
optimizer_features_enablestring12.1.0.1
Which three statements are true about the process of automatic optimization by using statistics 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.
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