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NEW QUESTION 28
You have altered a non-unique index to be invisible to determine if queries execute within an acceptable response
ti me without using this index.
Which two are possible if table updates are performed which affect the invisible index columns?
- A. The index is updated by the DML on the table.
- B. The index automatically becomes visible in order to have it updated by DML on the table.
- C. The index remains invisible.
- D. The index is not updated by the DML statements on the indexed table.
- E. The index becomes unusable but the table is updated by the DML.
Unlike unusable indexes, an invisible index is maintained during DML statements.
* Oracle 11g allows indexes to be marked as invisible. Invisible indexes are maintained like any other index, but they
are ignored by the optimizer unless the OPTIMIZER_USE_INVISIBLE_INDEXES parameter is set to TRUE at the instance
or session level. Indexes can be created as invisible by using the INVISIBLE keyword, and their visibility can be toggled
using the ALTER INDEX command.
NEW QUESTION 29
After implementing full Oracle Data Redaction, you change the default value for the NUMBER data type as follows:
After changing the value, you notice that FULL redaction continues to redact numeric data with zero.
What must you do to activate the new default value for numeric full redaction?
- A. Re-connect the sessions that access objects with redaction policies defined on them.
- B. Re-enable redaction policies that use FULL data redaction.
- C. Restart the database instance.
- D. Re-create redaction policies that use FULL data redaction.
- E. Flush the shared pool.
About Altering the Default Full Data Redaction Value
You can alter the default displayed values for full Data Redaction polices. By default, 0 is the redacted value when Oracle Database performs full redaction (DBMS_REDACT.FULL) on a column of the NUMBER data type. If you want to change it to another value (for example, 7), then you can run the DBMS_REDACT.UPDATE_FULL_REDACTION_VALUES procedure to modify this value. The modification applies to all of the Data Redaction policies in the current database instance. After you modify a value, you must restart the database for it to take effect.
* The DBMS_REDACT package provides an interface to Oracle Data Redaction, which enables you to mask (redact) data that is returned from queries issued by low-privileged users or an application.
* UPDATE_FULL_REDACTION_VALUES Procedure
This procedure modifies the default displayed values for a Data Redaction policy for full redaction.
* After you create the Data Redaction policy, it is automatically enabled and ready to redact data.
* Oracle Data Redaction enables you to mask (redact) data that is returned from queries issued by low- privileged users or applications. You can redact column data by using one of the following methods:
NEW QUESTION 30
What is the effect of specifying the “ENABLE PLUGGABLE DATABASE” clause in a
“CREATE DATABASE” statement?
- A. It will create a CDB that must be plugged into an existing CDB.
- B. It will create a multitenant container database (CDB) with only the root opened.
- C. It will create a CDB with root opened and seed read only.
- D. It will create a CDB with root and seed opened and one PDB mounted.
- E. It will create a CDB with root opened and seed mounted.
* 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.
NEW QUESTION 31
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