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【General】 Reliable 1Z0-182 Test Review, 1Z0-182 Latest Test Fee

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Oracle Database 23ai Administration Associate Sample Questions (Q51-Q56):NEW QUESTION # 51
Which three statements are true about UNDO and REDO?
  • A. UNDO is used for some flashback operations.
  • B. UNDO is used for read consistency.
  • C. REDO is used for ROLLBACK.
  • D. REDO is used for read consistency.
  • E. REDO is used for instance recovery.
  • F. Both REDO and UNDO can be multiplexed.
Answer: A,B,E
Explanation:
A . REDO is used for read consistency.False. Read consistency is achieved using UNDO, which provides a consistent view of data as of a specific point in time. REDO logs changes for recovery, not consistency.
B . UNDO is used for some flashback operations.True. Flashback features like Flashback Query and Flashback Table rely on UNDO to reconstruct past states of data.
C . UNDO is used for read consistency.True. UNDO stores pre-change data, enabling multi-version read consistency for queries.
D . Both REDO and UNDO can be multiplexed.False. REDO logs can be multiplexed (mirrored across multiple destinations), but UNDO is managed within a single UNDO tablespace per instance (though it can have multiple data files).
E . REDO is used for ROLLBACK.False. ROLLBACK uses UNDO to revert changes; REDO logs the changes but isn't used to undo them.
F . REDO is used for instance recovery.True. REDO logs are replayed during instance recovery to reapply committed changes after a crash.

NEW QUESTION # 52
Which three statements are true about Oracle Managed Files (OMF)?
  • A. If only DB_CREATE_FILE_DEST is specified, only data files and temp files are Oracle managed.
  • B. If only DB_CREATE_ONLINE_LOG_DEST_1 is specified, only redo logs and control files are Oracle Managed.
  • C. If DB_RECOVERY_FILE_DEST is specified, at least two different locations must be specified for DB_CREATE_ONLINE_LOG_DEST_n.
  • D. If DB_CREATE_ONLINE_LOG_DEST_1 is specified but DB_CREATE_FILE_DEST is not, new data files and temp files are stored in DB_CREATE_ONLINE_LOG_DEST_1 by default.
  • E. If DB_RECOVERY_FILE_DEST is specified but DB_CREATE_ONLINE_LOG_DEST_n is not, the redo logs and control files are placed in DB_RECOVERY_FILE_DEST by default.
  • F. If DB_CREATE_FILE_DEST is specified but DB_CREATE_ONLINE_LOG_DEST_n is not, new redo logs and control files are stored in DB_CREATE_FILE_DEST by default.
Answer: D,E,F
Explanation:
A .True. Without DB_CREATE_ONLINE_LOG_DEST_n, redo logs and control files default to DB_RECOVERY_FILE_DEST.
B .False. If only DB_CREATE_FILE_DEST is set, redo logs and control files also use it unless overridden.
C .True. DB_CREATE_ONLINE_LOG_DEST_1 becomes the default for data files and temp files if DB_CREATE_FILE_DEST is unset.
D .True. DB_CREATE_FILE_DEST serves as the default for all file types if no log-specific parameter is set.
E .False. Data files and temp files would also use DB_CREATE_ONLINE_LOG_DEST_1 if no other parameter is specified.
F .False. No such requirement exists; DB_RECOVERY_FILE_DEST operates independently.

NEW QUESTION # 53
Which three are benefits of using temp UNDO when performing DML on global temporary tables?
  • A. It permits DML on global temporary tables even if the database is opened read-only.
  • B. It reduces the amount of UNDO stored in the UNDO tablespace.
  • C. It reduces I/Os to the SYSTEM tablespace.
  • D. It reduces the amount of redo generated.
  • E. It reduces I/Os to the SYSAUX tablespace.
Answer: B,C,D
Explanation:
Temp UNDO, introduced in Oracle 12c and refined in 23ai, stores undo for global temporary tables (GTTs) in temporary tablespaces:
A . It permits DML on GTTs even if the database is opened read-only.False. In read-only mode, DML on GTTs is allowed regardless of temp UNDO, as GTT data is session-private, but temp UNDO doesn't specifically enable this.
B . It reduces the amount of UNDO stored in the UNDO tablespace.True. Temp UNDO stores undo in the temporary tablespace, reducing usage of the permanent UNDO tablespace.
C . It reduces I/Os to the SYSTEM tablespace.True. By avoiding permanent undo, it reduces metadata updates in the SYSTEM tablespace related to undo management.
D . It reduces the amount of redo generated.True. Temp UNDO changes are not redo-logged to the same extent as permanent undo, minimizing redo generation.
E . It reduces I/Os to the SYSAUX tablespace.False. SYSAUX is unrelated to undo management; temp UNDO affects temporary and SYSTEM tablespaces.

NEW QUESTION # 54
You have connected to a PDB to perform the administration operations of changing and verifying a system parameter that is PDB_MODIFIABLE. What is the appropriate mode to open the PDB to achieve this?
  • A. RESTRICTED READ ONLY
  • B. RESTRICTED WRITE ONLY
  • C. READ WRITE
  • D. READ ONLY
Answer: C
Explanation:
To change a PDB_MODIFIABLE parameter, the PDB must be in READ WRITE mode, allowing ALTER SYSTEM commands to modify parameters stored in the PDB's SPFILE or memory. READONLY modes prevent modifications, and no RESTRICTED WRITE ONLY mode exists.

NEW QUESTION # 55
In which two ways would you disable timing information collected for wait events and much of the performance monitoring capability of the database?
  • A. By executing the PL/SQL procedure DBMS_TIME_STATISTIC.LEVEL(BASIC).
  • B. By setting the TIMED_STATISTICS system parameter to FALSE.
  • C. By setting the STATISTICS_LEVEL parameter to BASIC.
  • D. By executing the PL/SQL procedure DBMS_TIME_STATISTIC.DISABLE(TRUE).
  • E. By setting the TIMED_STATISTICS_LEVEL system parameter to FALSE.
Answer: B,C
Explanation:
A .True. TIMED_STATISTICS = FALSE disables timing data collection.
B .False. No such procedure exists.
C .False. No TIMED_STATISTICS_LEVEL parameter exists.
D .True. STATISTICS_LEVEL = BASIC disables most performance monitoring.
E .False. No such procedure exists.

NEW QUESTION # 56
......
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