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Oracle Database 23ai Administration Associate Sample Questions (Q30-Q35):

NEW QUESTION # 30
Which resource plan is used to manage the resources for the predefined maintenance window?

A. By default, all predefined maintenance windows use the DEFAULT_MAINTENANCE_PLANresource plan, and automated maintenance tasks run under subplan called ORA$AUTOTASK.
B. The resources used by the predefined maintenance window can only be adjusted if you create a new resource plan in Resource Manager ...
C. The predefined maintenance window starts automatically with 20% of the system resources ...
D. The SYS_GROUP consumer resource group policies define the resources assigned ...

Answer: A

Explanation:
A .True. Oracle 23ai uses DEFAULT_MAINTENANCE_PLAN with ORA$AUTOTASK subplan for maintenance tasks (e.g., stats gathering). Others are incorrect or speculative.

NEW QUESTION # 31
Which two statements describe how Optimizer Statistics are collected?

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

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 # 32
Which two tasks can you perform using DBCA for databases?

A. Enable flashback database for an existing database.
B. Configure incremental backups for a new database.
C. Register a new database with an available Enterprise Manager Management server.
D. Change the standard block size of an existing database.
E. Configure a nonstandard block size for a new database.

Answer: C,E

Explanation:
A .False. Backups are configured via RMAN, not DBCA.
B .True. DBCA allows nonstandard block sizes during DB creation.
C .True. DBCA can register new DBs with EM.
D .False. Block size is fixed post-creation.
E .False. Flashback is enabled via SQL, not DBCA for existing DBs.

NEW QUESTION # 33
Which four statements are true about the Oracle Server architecture?

A. A session represents the state of a user's login to an instance.
B. Each server process or background process has their own Program Global Area (PGA).
C. A person or program can have more than one session with an instance by logging in with the same user.
D. A person or program can have more than one session with an instance by logging in with different users.
E. The buffer cache and the redo log buffer are held in the large pool.
F. A connection represents the state of a user's login to an instance.

Answer: A,B,C,D

Explanation:
A .True. Multiple sessions with different users are possible.
B .False. Buffer cache and redo log buffer are in SGA, not large pool.
C .True. Session tracks login state.
D .True. Each process has its own PGA.
E .False. Connection is the network link; session is the state.
F .True. Same user can have multiple sessions (e.g., via different terminals).

NEW QUESTION # 34
Which two statements are true about the configuration and use of UNDO?

A. UNDO_RETENTION specifies how long all types of UNDO are retained.
B. Unexpired UNDO is always retained.
C. Active UNDO is always retained.
D. UNDO_RETENTION specifies for how long Oracle attempts to keep unexpired UNDO.
E. UNDO_RETENTION specifies for how long Oracle attempts to keep expired and unconsumed UNDO.

Answer: C,D

Explanation:
A .True. Active (in-use) UNDO is never overwritten.
B .False. Unexpired UNDO can be reused if space is needed.
C .False. Applies to unexpired, not expired UNDO.
D .False. Only unexpired UNDO is targeted.
E .True. UNDO_RETENTION sets the retention goal for unexpired UNDO.

NEW QUESTION # 35
......

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