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Accurate Oracle - 1Z1-182 - Practice Test Oracle Database 23ai Administration Associate Pdf

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Oracle Database 23ai Administration Associate Sample Questions (Q95-Q100):

NEW QUESTION # 95
Which of the following statements is true about external tables?

A. They describe data stored in the database.
B. They describe how the external table layer presents data to the server.
C. They describe how data is stored in the external source.
D. They are read/write tables.

Answer: B

Explanation:
A .False. External tables are read-only.
B .True. Defines how external data (e.g., CSV) is mapped to SQL.
C .False. Data is external, not in the DB.
D .False. Storage is external; Oracle doesn't define it.

NEW QUESTION # 96
Which two statements describe how Optimizer Statistics are collected?

A. Optimizer Statistics are collected by the Statistics Advisor.
B. Optimizer Statistics are collected automatically by Automatic Workload Repository (AWR) Snapshot.
C. Optimizer Statistics can be manually collected at multiple levels using DBMS_STATS.GATHER_*_STATS PL/SQL procedures.
D. Optimizer Statistics are collected in real-time as data is inserted, deleted, or updated.
E. Optimizer Statistics are collected automatically by an automatic maintenance job that runsduring predefined maintenance windows.

Answer: C,E

Explanation:
Optimizer Statistics drive the cost-based optimizer's query plans. Let's dissect each option:
A . Optimizer Statistics are collected automatically by an automatic maintenance job that runs during predefined maintenance windows.
True. Oracle 23ai uses the AutoTask framework to gather stats automatically during maintenance windows (e.g., nightly 10 PM-2 AM). The GATHER_STATS_PROG job, managed by DBMS_AUTO_TASK_ADMIN, collects stats for stale or missing objects.
Mechanics:Controlled by STATISTICS_LEVEL=TYPICAL (default) and the DEFAULT_MAINTENANCE_PLAN. It prioritizes objects with >10% changes (stale stats) or no stats.
Practical Use:Ensures stats are current without manual intervention, critical for dynamic workloads.
Edge Case:Disabled if STATISTICS_LEVEL=BASIC or the job is manually disabled via DBMS_AUTO_TASK_ADMIN.DISABLE.
B . Optimizer Statistics are collected in real-time as data is inserted, deleted, or updated.
False. Stats aren't updated in real-time; this would be too resource-intensive. Instead, Oracle tracks changes (e.g., via DBA_TAB_MODIFICATIONS) and updates stats periodically via AutoTask or manually. Real-time stats exist in 23ai for specific cases (e.g., GATHER_TABLE_STATS with REAL_TIME_STATS), but it's not the default.
Why Incorrect:Real-time collection would degrade performance for OLTP systems, contradicting Oracle's batch approach.
C . Optimizer Statistics can be manually collected at multiple levels using DBMS_STATS.GATHER_*_STATS PL/SQL procedures.
True. The DBMS_STATS package offers granular control: GATHER_TABLE_STATS, GATHER_SCHEMA_STATS, GATHER_DATABASE_STATS, etc., allowing stats collection for tables, schemas, or the entire database.
Mechanics:Example: BEGIN DBMS_STATS.GATHER_TABLE_STATS('HR', 'EMPLOYEES'); END;. Options like ESTIMATE_PERCENT and DEGREE fine-tune the process.
Practical Use:Used for immediate stats updates post-DML or for custom schedules outside maintenance windows.
Edge Case:Overuse can lock stats (e.g., FORCE=TRUE), requiring careful management.
D . Optimizer Statistics are collected by the Statistics Advisor.
False. The Statistics Advisor (new in 23ai) analyzes and recommends stats improvements but doesn't collect them. Collection is still via DBMS_STATS or AutoTask.
Why Incorrect:It's a diagnostic tool, not an executor.
E . Optimizer Statistics are collected automatically by Automatic Workload Repository (AWR) Snapshot.
False. AWR snapshots capture performance metrics (e.g., wait times), not optimizer stats. Stats collection is a separate process via AutoTask or manual commands.
Why Incorrect:AWR and stats collection serve distinct purposes-monitoring vs. optimization.

NEW QUESTION # 97
As the DBA, you execute this command: GRANT CREATE VIEW TO usr1 WITH ADMIN OPTION; USR1 then executes: GRANT CREATE VIEW TO usr2 WITH ADMIN OPTION; USR2 then executes: GRANT CREATE VIEW TO usr3; Which statement is true?

A. The DBA can revoke only ADMIN OPTION from USR1.
B. When the DBA revokes the CREATE VIEW privilege from USR1, it is revoked from USR2 but not USR3.
C. When the DBA revokes the CREATE VIEW privilege from USR1, it is neither revoked from USR2 nor USR3.
D. USR1 can revoke the CREATE VIEW privilege from USR3.
E. When the DBA revokes the CREATE VIEW privilege from USR2, it is revoked from USR3.

Answer: C,E

Explanation:
A .False. Revoking from USR1 doesn't cascade due to WITH ADMIN OPTION.
B .True. Revoking from USR2 cascades to USR3 because USR2 granted it.
C .False. DBA can revoke the full privilege, not just ADMIN OPTION.
D .False. USR1 can't revoke from USR3 directly; only the grantor (USR2) can.
E .True. WITH ADMIN OPTION breaks the revoke chain from USR1 onward.

NEW QUESTION # 98
You execute the SHUTDOWN ABORT command. Which two statements are true?

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

Answer: D,E

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 # 99
Which three statements are true about resumable space allocation in Oracle databases?

A. Resumable space allocation may be enabled for some sessions and not others.
B. A user's session may be suspended even if the user has the UNLIMITED TABLESPACE system privilege.
C. The AFTER SUSPEND event trigger can itself be suspended due to space conditions.
D. Resumable space allocation is only possible with locally managed tablespaces.
E. A user's session may be suspended and resumed multiple times.
F. All sessions must have the same timeout value when waiting for resumable space allocations.

Answer: A,B,E

Explanation:
A .True. Enabled per session with ALTER SESSION ENABLE RESUMABLE.
B .True. Multiple suspensions can occur in one session.
C .False. Works with dictionary-managed tablespaces too.
D .False. Timeout is session-specific.
E .True. Privilege doesn't prevent suspension; quota limits do.
F .False. Triggers execute but can't suspend themselves.

NEW QUESTION # 100
......

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