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Q51. A warehouse fact table in your Oracle 12c Database is range-partitioned by month and accessed frequently with queries that span multiple partitions
The table has a local prefixed, range partitioned index.
Some of these queries access very few rows in some partitions and all the rows in other partitions, but these queries still perform a full scan for all accessed partitions.
This commonly occurs when the range of dates begins at the end of a month or ends close to the start of a month.
You want an execution plan to be generated that uses indexed access when only a few rows are accessed from a segment, while still allowing full scans for segments where many rows are returned.
Which three methods could transparently help to achieve this result?
A. Using a partial local Index on the warehouse fact table month column with indexing disabled to the table partitions that return most of their rows to the queries.
B. Using a partial local Index on the warehouse fact table month column with indexing disabled for the table partitions that return a few rows to the queries.
C. Using a partitioned view that does a UNION ALL query on the partitions of the warehouse fact table, which retains the existing local partitioned column.
D. Converting the partitioned table to a partitioned view that does a UNION ALL query on the monthly tables, which retains the existing local partitioned column.
E. Using a partial global index on the warehouse fact table month column with indexing disabling for the table partitions that return most of their rows to the queries.
F. Using a partial global index on the warehouse fact table month column with indexing disabled for the table partitions that return a few rows to the queries.
* Oracle 12c now provides the ability to index a subset of partitions and to exclude the others.
Local and global indexes can now be created on a subset of the partitions of a table. Partial Global indexes provide more flexibility in index creation for partitioned tables. For example, index segments can be omitted for the most recent partitions to ensure maximum data ingest rates without impacting the overall data model and access for the partitioned object.
Partial Global Indexes save space and improve performance during loads and queries. This feature supports global indexes that include or index a certain subset of table partitions or subpartitions, and exclude the others. This operation is supported using a default table indexing property. When a table is created or altered, a default indexing property can be specified for the table or its partitions.
Q52. In your production database, data manipulation language (DML) operations are executed on the SALES table.
You have noticed some dubious values in the SALES table during the last few days. You are able to track users, actions taken, and the time of the action for this particular period but the changes in data are not tracked. You decide to keep track of both the old data and new data in the table long with the user information.
What action would you take to achieve this task?
A. Apply fine-grained auditing.
B. Implement value-based auditing.
C. Impose standard database auditing to audit object privileges.
D. Impose standard database auditing to audit SQL statements.
Q53. You notice a performance change in your production Oracle 12c database. You want to know which change caused this performance difference.
Which method or feature should you use?
A. Compare Period ADDM report
B. AWR Compare Period report
C. Active Session History (ASH) report
D. Taking a new snapshot and comparing it with a preserved snapshot
Explanation: The awrddrpt.sql report is the Automated Workload Repository Compare
Period Report. The awrddrpt.sql script is located in the $ORACLE_HOME/rdbms/admin directory.
Not A: Compare Period ADDM
Use this report to perform a high-level comparison of one workload replay to its capture or to another replay of the same capture. Only workload replays that contain at least 5 minutes of database time can be compared using this report.
Q54. Which two statements are true about the Automatic Database Diagnostic Monitor (ADDM)? (Choose two.)
A. The ADDM requires at least four AWR snapshots for analysis
B. The ADDM runs after each AWR snapshot is collected automatically by MMON
C. The results of the ADDM analysis are stored in the Automatic Workload Repository (AWR)
D. The ADDM analysis provides only diagnostics information but does not provide recommendations
E. The ADDM calls other advisors if required, but does not provide recommendations about the advisors
Q55. Examine the parameters for your database instance:
undo_management string AUTO
undo_retentioninteger 12 00
undo_tablespace string UNDOTBS1
You execute the following command:
SQL> ALTER TABLESPACE undotbs1 RETENTION NOGUARANTEE;
Which statement is true in this scenario?
A. Undo data is written to flashback logs after 1200 seconds.
B. Inactive undo data is retained for 1200 seconds even if subsequent transactions fail due to lack of space in the undo tablespace.
C. You can perform a Flashback Database operation only within the duration of 1200 seconds.
D. An attempt is made to keep inactive undo for 1200 seconds but transactions may overwrite the undo before that time has elapsed.
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Q56. In your multitenant container database (CDB) with two pluggable database (PDBs). You want to create a new PDB by using SQL Developer.
Which statement is true?
A. The CDB must be open.
B. The CDB must be in the mount stage.
C. The CDB must be in the nomount stage.
D. Alt existing PDBs must be closed.
* 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. The size of the seed PDB is only about 1 gigabyte and it takes only a few seconds on a typical machine to copy it.
Q57. Examine the following command;
ALTER SYSTEM SET enable_ddl_logging = TRUE;
Which statement is true?
A. Only the data definition language (DDL) commands that resulted in errors are logged in the alert log file.
B. All DDL commands are logged in the alert log file.
C. All DDL commands are logged in a different log file that contains DDL statements and their execution dates.
D. Only DDL commands that resulted in the creation of new segments are logged.
E. All DDL commands are logged in XML format in the alert directory under the Automatic Diagnostic Repository (ADR) home.
Explanation: Once DDL logging is turned on, every DDL command will be logged in the alert log file and also the log.xml file.
* By default Oracle database does not log any DDL operations performed by any user. The default settings for auditing only logs DML operations.
* Oracle 12c DDL Logging – ENABLE_DDL_LOGGING
The first method is by using the enabling a DDL logging feature built into the database. By default it is turned off and you can turn it on by setting the value of ENABLE_DDL_LOGGING initialization parameter to true.
* We can turn it on using the following command. The parameter is dynamic and you can
turn it on/off on the go.
SQL> alter system set ENABLE_DDL_LOGGING=true;
System altered. Elapsed: 00:00:00.05 SQL>
Once it is turned on, every DDL command will be logged in the alert log file and also the log.xml file.
Q58. You enabled an audit policy by issuing the following statements:
SQL> AUDIT POLICY ORA_DATABASE_PARAMETER BY SCOTT;
SQL> AUDIT POLICY ORA_DATABASE_PARAMETER BY SYS, SYSTEM;
For which database users and for which executions is the audit policy now active? Select two.
A. SYS, SYSTEM
C. Only for successful executions
D. Only for failed executions
E. Both successful and failed executions
Explanation: * The ORA_DATABASE_PARAMETER policy audits commonly used Oracle Database parameter settings. By default, this policy is not enabled.
Q59. 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.
Explanation: 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.
* 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.
Q60. You run a script that completes successfully using SQL*Plus that performs these actions:
1. Creates a multitenant container database (CDB)
2. Plugs in three pluggable databases (PDBs)
3. Shuts down the CDB instance
4. Starts up the CDB instance using STARTUP OPEN READ WRITE
Which two statements are true about the outcome after running the script?
A. The seed will be in mount state.
B. The seed will be opened read-only.
C. The seed will be opened read/write.
D. The other PDBs will be in mount state.
E. The other PDBs will be opened read-only.
F. The PDBs will be opened read/write.
Explanation: B: The seed is always read-only.
D: Pluggable databases can be started and stopped using SQL*Plus commands or the ALTER PLUGGABLE DATABASE command.