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【General】 Free PDF Quiz Oracle - 1Z0-182–Efficient Guaranteed Passing

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Oracle Database 23ai Administration Associate Sample Questions (Q27-Q32):NEW QUESTION # 27
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 an automatic maintenance job that runsduring predefined maintenance windows.
  • C. Optimizer Statistics can be manually collected at multiple levels using DBMS_STATS.GATHER_*_STATS PL/SQL procedures.
  • D. Optimizer Statistics are collected automatically by Automatic Workload Repository (AWR) Snapshot.
  • E. Optimizer Statistics are collected in real-time as data is inserted, deleted, or updated.
Answer: B,C
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 Caseisabled 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 # 28
How do you validate that the database was migrated to Unified Auditing?
  • A. By using the LSINVENTORY Command to query the Oracle Database Software Library.
  • B. By querying the DBA_UNIFIED_AUDIT_OPTION view.
  • C. By querying V$OPTION for parameter Unified Auditing.
  • D. By executing DBMS_AUDIT_MGMT PL/SQL package in Verify mode.
Answer: C
Explanation:
Unified Auditing is enabled at database creation or migration in 23ai. Let's analyze:
A . By querying V$OPTION for parameter Unified Auditing.
True. SELECT VALUE FROM V$OPTION WHERE PARAMETER = 'Unified Auditing'; returns TRUE if enabled. It's the definitive way to confirm Unified Auditing is active at the database level.
Mechanics:V$OPTION reflects compiled-in features; TRUE indicates the binary was linked with Unified Auditing (uniauflt=on during relink).
Practical Useuick, reliable check post-migration or upgrade.
B . By using the LSINVENTORY Command to query the Oracle Database Software Library.
False. LSINVENTORY (from OPatch) lists installed software components, not runtime features like auditing mode.
C . By querying the DBA_UNIFIED_AUDIT_OPTION view.
False. This view doesn't exist; DBA_AUDIT_POLICIES or UNIFIED_AUDIT_TRAIL show policies and records but not migration status.
D . By executing DBMS_AUDIT_MGMT PL/SQL package in Verify mode.
False. No "Verify mode" exists in DBMS_AUDIT_MGMT; it manages audit trails, not migration validation.

NEW QUESTION # 29
You want to apply the principle of least privilege in all your live databases. One of your requirements is to revoke unnecessary privileges from all users who have them using Privilege Analysis. Which two types of analyses can be done using the DBMS_PRIVILEGE_CAPTURE package?
  • A. Analysis of privileges that a user has on their own schema objects.
  • B. Analysis of privileges granted indirectly to a role that are then used by a user who has been granted that role.
  • C. Analysis of all privileges used by the SYS user.
  • D. Analysis of privileges that a user has on other schemas' objects.
  • E. Analysis of privileges granted directly to a role that are then used by a user who has been granted that role.
Answer: B,E
Explanation:
A .False. Limited to captured privileges, not all schema objects.
B .False. SYS is excluded from capture.
C .True. Captures indirect role privileges used.
D .True. Captures direct role privileges used.
E .False. Focus is on roles, not self-owned objects broadly.

NEW QUESTION # 30
Which three statements are true about using SQL*Plus?
  • A. It can run scripts entered at the SQL prompt.
  • B. It must be downloaded from the Oracle Technology Network (OTN).
  • C. It has its own commands that are separate from any SQL statements.
  • D. It can run scripts passed to it by a shell script.
  • E. It can run Recovery Manager (RMAN) commands.
  • F. It has both command-line and graphical user interfaces (GUI).
Answer: A,C,D
Explanation:
A .True. sqlplus @script.sql works from shell scripts.
B .False. RMAN uses its own client, not SQL*Plus.
C .False. Bundled with Oracle DB software.
D .False. Command-line only; no GUI in 23ai.
E .True. @script runs scripts interactively.
F .True. Commands like SHOW PARAMETER are unique.

NEW QUESTION # 31
Which of the following is true about the status of a PDB that has been unplugged from a CDB?
  • A. The STATUS column in CDB_PDBS of the unplugged PDB will be DISABLED.
  • B. The STATUS column in CDB_PDBS of the unplugged PDB will be REMOVED.
  • C. The STATUS column in CDB_PDBS of the unplugged PDB will be UNPLUGGED.
  • D. The STATUS column in CDB_PDBS of the unplugged PDB will be UNAVAILABLE.
Answer: C
Explanation:
A .True. After ALTER PLUGGABLE DATABASE ... UNPLUG, CDB_PDBS.STATUS shows UNPLUGGED.
B .False. UNAVAILABLE isn't a valid status here.
C .False. REMOVED isn't used; UNPLUGGED persists until dropped.
D .False. DISABLED isn't a PDB state in this context.

NEW QUESTION # 32
......
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