1Z1-182 NEW DUMPS | 1Z1-182 TRUSTWORTHY EXAM TORRENT

1Z1-182 New Dumps | 1Z1-182 Trustworthy Exam Torrent

1Z1-182 New Dumps | 1Z1-182 Trustworthy Exam Torrent

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Oracle Database 23ai Administration Associate Sample Questions (Q40-Q45):

NEW QUESTION # 40
Which two statements describe how Optimizer Statistics are collected?

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

Answer: A,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 # 41
You execute this command: CREATE SMALLFILE TABLESPACE sales DATAFILE '/u01/app/oracle/sales01.dbf' SIZE 5G SEGMENT SPACE MANAGEMENT AUTO; Which two statements are true about the SALES tablespace?

  • A. It uses the database default block size.
  • B. It must be smaller than the smallest BIGFILE tablespace.
  • C. It is a locally managed tablespace.
  • D. Free space is managed using freelists.
  • E. Any data files added to the tablespace must have a size of 5 gigabytes.

Answer: A,C

Explanation:
A . Free space is managed using freelists.False. The SEGMENT SPACE MANAGEMENT AUTO clause specifies Automatic Segment Space Management (ASSM), which uses bitmaps to track free space, not freelists (used in Manual Segment Space Management).
B . It uses the database default block size.True. The BLOCKSIZE clause is not specified in the command, so the tablespace inherits the database's default block size (typically 8K unless altered via DB_BLOCK_SIZE).
C . It must be smaller than the smallest BIGFILE tablespace.False. There's no such restriction; SMALLFILE and BIGFILE tablespaces differ in structure (multiple vs. single data file), not mandated size relationships.
D . It is a locally managed tablespace.True. In Oracle 23ai, all tablespaces created without an explicit EXTENT MANAGEMENT DICTIONARY clause are locally managed by default, using extent allocation bitmaps in the data file headers.
E . Any data files added to the tablespace must have a size of 5 gigabytes.False. The initial data file is 5G, but additional data files can have different sizes when added using ALTER TABLESPACE ... ADD DATAFILE.


NEW QUESTION # 42
Which advisor is used to detect missing or stale object statistics?

  • A. SQL Tuning Advisor
  • B. SQL Performance Analyzer
  • C. SQL Access Advisor
  • D. SQL Statistics Advisor

Answer: D

Explanation:
B .True. The SQL Statistics Advisor (new in 23ai) identifies stale or missing statistics. Others focus on tuning, performance analysis, or access paths.


NEW QUESTION # 43
Which two are benefits of external tables?

  • A. They can be queried while the database is in the MOUNT state like dynamic performance views.
  • B. The results of a complex join or aggregating function or both can be unloaded to a file for transportation to other systems.
  • C. They support UPDATEs, which transparently updates records in the file system as if they were table rows.
  • D. They support DELETEs, which transparently deletes records in the file system as if they were table rows.
  • E. They can be queried, transformed, and joined with other tables without having to load the data first.

Answer: B,E

Explanation:
A .False. External tables are read-only; no DELETE.
B .False. Require OPEN state, unlike V$ views.
C .False. No UPDATE support; read-only.
D .True. Queryable like regular tables without loading.
E .True. Data Pump can unload query results to files.


NEW QUESTION # 44
Which two statements are true about the configuration and use of UNDO?

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

Answer: A,B

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 # 45
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