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New Oracle 1z0-052 Exam Dumps Collection (Question 2 - Question 11)
New Questions 2
Which two statements are true regarding a tablespace? (Choose two.)
A. It can span multiple databases
B. It can consist of multiple data files
C. It can contain blocks of different files
D. It can contains segments of different sizes
E. It can contains a part of nonpartitioned segment
Answer: B,D
New Questions 3
You are managing an Oracle Database 11g database. The database is open, and you plan to perform Recovery Manager (RMAN) backups.
Which three statements are true about these backups? (Choose three.)
A. The backups would be consistent.
B. The backups would be inconsistent.
C. The backups would be possible only if the database is running in ARCHIVELOG mode.
D. The backups would be possible only if the database is running in NOARCHIVELOG mode.
E. The backups need to be restored and the database has to be recovered in case of a media failure.
Answer: B,C,E
Explanation:
u2022Recovery Manager (RMAX): Oracle Tool that provides a complete solution for the backup, restoration, and recovery needs of the entire database or of specific database files
New Questions 4
Identify the memory component from which memory may be allocated for:
Session memory for the shared serverBuffers for I/O slavesOracle Database Recovery Manager (RMAN) backup and restore operations
A. Large Pool
B. Redo Log Buffer
C. Database Buffer Cache
D. Program Global Area (PGA)
Answer: A
New Questions 5
You have recently collected statistics on certain objects of a schema in your database. But you observe suboptimal execution plans for the queries on these objects after two days of statistics collection. The optimizer statistics retention period is set to its default value.
Which action would help to use the previous set of statistics on the objects?
A. Restore statistics from statistics history.
B. Reduce the optimizer statistics retention period by 2 days.
C. Set the OPTIMIZER_PENDING_STATISTICS parameter to TRUE.
D. Reduce the Automatic Workload Repository (AWR) retention period by 2 days.
Answer: A
New Questions 6
You executed the following command to create a tablespace called SALES_DATA: SQL> CREATE TABLESPACE sales_data
DATAFILE SIZE 100M
SEGMENT SPACE MANAGEMENT AUTO;
Which two statements are true about the SALES_DATA tablespace? (Choose two)
A. The database automatically determines the extent-sizing policy for the tablespace.
B. The segments are automatically shrunk when the contents are removed from them.
C. The allocation of extents within the tablespace is managed through the dictionary tables.
D. The space utilization description of the data blocks in segments is recorded in bitmap blocks.
E. The space utilization description of the data blocks in segments is managed through free lists.
Answer: A,D
New Questions 7
Automatic Shared Memory Management is disabled for your database instance. You realize that there are cases of SQL statements performing poorly because of repeated parsing activity, resulting in degradation of performance.
What would be your next step to improve performance?
A. Run the SQL Access Advisor
B. Run the memory Advisor for the SGA
C. Run the memory Advisor for the PGA
D. Run the memory advisor for the shared pool
E. Run the memory advisor for the buffer cache
Answer: D
Explanation:
Using the Memory Advisor through OEM
The Memory Advisor can be used only when the automatic memory management (AMM) feature is disabled. The Memory Advisor has three advisors that give recommendations on: the Shared Pool in the SGA, the Buffer Cache in the SGA, and the PGA.
New Questions 8
Why does performance degrade when many UPDATE, INSERT or DELETE statements are issued on a table that has an associated bitmap index?
A. The DML operations re-create the bitmap index blocks
B. The bitmap index is rebuilt automatically after a DML operation
C. The smallest amount of a bitmap that can be locked is a bitmap segment
D. Additional time is taken to remove NULL values from the bitmap index after a DML operation
Answer: C
New Questions 9
Note the following points describing various utilities in Oracle Database 11g:
1. It enables the high-speed transfer of data from one database to another
2. It provides a complete solution for the backup, restoration and recovery needs of the entire database
3. It enables the loading of data from an external file into table of an Oracle Database
4. It provides a tape backup management for the Oracle ecosystem Which point describes Oracle Secure Backup?
A. 1
B. 2
C. 3
D. 4
E. 1,2 and 4
F. 1,2,3, and 4
Answer: D
New Questions 10
Which two statements are true regarding transactions in an Oracle database? (Choose two.)
A. Multiple transactions can use the same undo segment.
B. A transaction is assigned an undo segment when it is started.
C. More than one transaction cannot share the same extent in the undo tablespace.
D. The transactions use system undo segment to store undo data if all the segments in the undo tablespace are used.
Answer: A,B
Explanation:
Segments
The level of logical database storage above an extent is called a segment. A segment is a set of extents that are allocated for a certain logical structure. Different types of segments include:
u2022 Data segments: Each nonclustered. non-index-organized table has a data segment, with the exception of external tables, global temporary tables, and partitioned tables in which each table has one or more segments. All of the table's data is stored in the extents of its data segment. For a partitioned table, each partition has a data segment. Each cluster has a data segment. The data of every table in the cluster is stored in the cluster's data segment.
u2022 Index segments: Each index has an index segment that stores all of its data. For a partitioned index, each partition has an index segment.
u2022 Undo segments: One UNDO tablespace is created for each database instance. This tablespace contains numerous undo segments to temporarily store undo information. The information in an undo segment is used to generate read-consistent database information and. dining database recovery, to roll back uncommitted transactions for users.
u2022 Temporary segments: Temporary segments are created by the Oracle database when a SQL statement needs a temporary work area to complete execution. When the statement finishes execution, the temporary segment's extents are returned to the instance for future use. Specify either a default temporary tablespace for every user, or a default temporary tablespace that is used database-wide.
Transactions and Undo Data
When a transaction starts, it is assigned to an undo segment. Throughout the life of the transaction, when data is changed, the original (before the change) values are copied into the undo segment. You can see which transactions are assigned to which undo segments by checking the V$TRANSACTION dynamic performance view.
Undo segments are specialized segments that are automatically created by the instance as needed to support transactions. Like all segments, undo segments are made up of extents, which, in turn, consist of data blocks. Undo segments automatically grow and shrink as needed, acting as a circular storage buffer for their assigned transactions.
Transactions fill extents in their undo segments until a transaction is completed or all space is consumed. If an extent fills up and more space is needed, the transaction acquires that space from the next extent in the segment. After all extents have been consumed, the transaction either wraps around back into the first extent or requests a new extent to be allocated to the undo segment.
New Questions 11
Which statement is true about the UNDO_RETENTION parameter when retention guarantee is not enabled?
A. It is the time period after which the undo data becomes obsolete.
B. It is the time period after which the committed undo data would be transferred to a temporary tablespace.
C. It is the minimum time period up to which the committed undo data would be retained if free undo space is available.
D. It is the time period after which the undo data is transferred to the Flash Recovery Area to provide read consistency.
Answer: C
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