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Oracle Database 23ai Administration Associate Sample Questions (Q43-Q48):

NEW QUESTION # 43
Which two statements are true about the DUAL table?

A. It can be accessed by any user who has the SELECT privilege in any schema.
B. It can display multiple rows and columns.
C. It can display multiple rows but only a single column.
D. It consists of a single row and single column of VARCHAR2 data type.
E. It can be accessed only by the SYS user.
F. It can be used to display only constants or pseudo columns.

Answer: A,D

Explanation:
A .True. DUAL is public; any user with SELECT can query it.
B .True. One row, one VARCHAR2 column (DUMMY).
C .False. Fixed at one row.
D .False. Not restricted to SYS.
E .False. One row, one column only.
F .False. Can return expressions, not just constants.

NEW QUESTION # 44
Which statement regarding PDBs (Pluggable Databases) is correct?

A. You cannot drop a source PDB of a refreshable PDB.
B. You can drop an application root along with the associated PDBs.
C. You can drop a PDB as long as it is not the PDB seed.
D. When the relocation of a PDB is finished, the source PDB must be dropped.

Answer: C

Explanation:
A .True. Any PDB except PDB$SEED can be dropped.
B .False. Source PDBs of refreshable clones can be dropped after cloning.
C .False. Dropping an application root requires explicit handling of PDBs.
D .False. Relocation doesn't mandate dropping the source PDB.

NEW QUESTION # 45
Which two statements are true about the PMON background process?

A. It frees unused temporary segments.
B. It registers database services with all local and remote listeners known to the database instance.
C. It frees resources held by abnormally terminated processes.
D. It rolls back transactions when a process fails.
E. It records checkpoint information in the control file.

Answer: C,D

Explanation:
A .False. LREG handles registration in 23ai, not PMON.
B .False. CKPT (Checkpoint) process updates the control file.
C .True. PMON cleans up after failed processes (e.g., releases locks).
D .True. PMON rolls back uncommitted transactions of failed processes.
E .False. SMON (System Monitor) manages temporary segment cleanup.

NEW QUESTION # 46
You execute the SHUTDOWN ABORT command. Which two statements are true?

A. Subsequent instance startup performs media recovery.
B. A checkpoint is written.
C. Uncommitted transactions are not rolled back by the shutdown.
D. Subsequent instance startup performs instance recovery.
E. Data files are closed normally.

Answer: C,D

Explanation:
A .False. No checkpoint occurs with ABORT.
B .False. Instance recovery, not media recovery, is needed.
C .True. Crash recovery rolls back uncommitted changes on startup.
D .False. Files aren't closed cleanly with ABORT.
E .True. Shutdown doesn't roll back; recovery does.

NEW QUESTION # 47
Which two statements are true concerning logical and physical database structures?

A. A segment's blocks can be of different sizes.
B. A segment can span multiple data files in some tablespaces.
C. A segment's blocks can be of different sizes.
D. A segment might have only one extent.
E. All tablespaces may have one or more data files.
F. Segments can span multiple tablespaces.

Answer: B,D

Explanation:
False. All blocks in a segment use the tablespace's block size (e.g., 8KB). While a database can have tablespaces with different block sizes (e.g., 8KB, 32KB), a single segment's blocks are uniform, as it resides in one tablespace.
Explanation:
Logical structures (e.g., segments, extents) map to physical structures (e.g., data files, blocks). Let's dissect each option:
A : A segment can span multiple data files in some tablespaces.
True. A segment (e.g., a table or index) is a logical entity stored in a tablespace. In a smallfile tablespace (default in Oracle), a segment's extents can span multiple data files if the tablespace has multiple files and space allocation requires it. This is common in large tables or when autoextend adds new files.
Mechanics:Oracle allocates extents across available data files in a round-robin fashion (with ASSM) or as needed, ensuring the segment's data is distributed. This doesn't apply to bigfile tablespaces, which use a single data file.
Example:A 10GB table in a tablespace with two 5GB data files will span both.
B : Segments can span multiple tablespaces.
False. A segment is confined to a single tablespace. Oracle enforces this to maintain logical separation (e.g., a table's data stays in its assigned tablespace). Partitioned tables can have partitions in different tablespaces, but each partition is a separate segment.
Why Not:The segment header and extent map reside in one tablespace, preventing cross-tablespace spanning for a single segment.
C : A segment might have only one extent.
True. A segment starts with one extent upon creation (e.g., a small table or index). If no further growth occurs, it remains a single-extent segment. This is common with small objects or when INITIAL extent size suffices.
Mechanics:In locally managed tablespaces (default), the initial extent is allocated based on INITIAL or tablespace defaults (e.g., 64KB), and additional extents are added only as needed.
D : All tablespaces may have one or more data files.
False. Bigfile tablespaces are restricted to one data file (up to 128TB). Smallfile tablespaces (traditional) can have multiple data files (up to 1022), but the "all" phrasing makes this false due to bigfile exceptions.
Clarification:The question's intent may assume smallfile tablespaces, but Oracle 23ai supports both types.

NEW QUESTION # 48
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