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Oracle 1Z1-182 認定試験の出題範囲：
トピック
出題範囲
トピック 1
- Describe Managing Database Instances: This section tests the knowledge of Database Administrators in performing essential tasks for managing database instances. It includes starting and shutting down databases, utilizing dynamic performance views, managing initialization parameter files, and using the Automatic Diagnostic Repository (ADR) for troubleshooting.
トピック 2
- Configuring Oracle Net Services: This section measures the skills of Network Administrators and Database Administrators in configuring Oracle Net Services. It includes identifying administration components, describing connection methods, and ensuring seamless communication between clients and databases.
トピック 3
- Managing Users, Roles, and Privileges: This domain evaluates the expertise of Security Administrators in implementing user security measures. It focuses on creating and managing users, roles, and privileges to ensure secure access to Oracle databases.
トピック 4
- Introduction to Performance: This section evaluates the expertise of Performance Analysts in summarizing Oracle database performance management techniques. It includes measuring database performance using SQL execution plans, directives, and advisors to ensure optimal system efficiency.
トピック 5
- Managing Tablespaces and Datafiles: This section assesses the abilities of Storage Administrators in creating, modifying, and describing tablespaces. It also covers recognizing data storage requirements and understanding datafile placement for efficient storage management.
トピック 6
- Automated Maintenance: This section measures the skills of Database Administrators in describing automated maintenance tasks within Oracle databases. It focuses on applying automated features to streamline routine maintenance activities.
トピック 7
- Describe Oracle Database Architecture: This section of the exam measures the skills of Database Administrators and System Architects in understanding the Oracle database architecture. It covers the configurations of Oracle database instances, memory structures like SGA and PGA, and process structures such as background processes. It also explains the logical and physical database structures, including datafiles, control files, and redo log files.
トピック 8
- Managing Undo: This domain measures the skills of Database Administrators in using undo data effectively. It compares undo data with redo data and explains temporary undo usage for efficient transaction management.
トピック 9
- Managing Storage: This section tests the knowledge of Storage Engineers in managing storage features such as resumable space allocation, segment space-saving, and block space management. It also includes defining segment characteristics to optimize storage utilization.
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Oracle Database 23ai Administration Associate 認定 1Z1-182 試験問題 (Q26-Q31):
質問 # 26
Which two statements describe how Optimizer Statistics are collected?
- A. Optimizer Statistics are collected by the Statistics Advisor.
- B. Optimizer Statistics are collected in real-time as data is inserted, deleted, or updated.
- C. Optimizer Statistics are collected automatically by an automatic maintenance job that runsduring predefined maintenance windows.
- D. Optimizer Statistics can be manually collected at multiple levels using DBMS_STATS.GATHER_*_STATS PL/SQL procedures.
- E. Optimizer Statistics are collected automatically by Automatic Workload Repository (AWR) Snapshot.
正解：C、D
解説：
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.
質問 # 27
You execute the SHUTDOWN ABORT command. Which two statements are true?
- A. A checkpoint is written.
- B. Subsequent instance startup performs media recovery.
- C. Subsequent instance startup performs instance recovery.
- D. Uncommitted transactions are not rolled back by the shutdown.
- E. Data files are closed normally.
正解：C、D
解説：
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.
質問 # 28
Which three statements are true about row chaining and row migration done by Oracle database block space management?
- A. A migrated row results in an update to any index on the table to point the row ID in the index to the row's new location.
- B. Update statements can result in one or more chained rows.
- C. Insert statements can result in a migrated row.
- D. Row pieces of a chained row must always reside in different blocks.
- E. Update statements can result in one or more migrated rows.
正解：A、B、E
解説：
A .True. Migration updates index ROWIDs.
B .True. Updates can migrate rows if space is insufficient.
C .True. Large updates can chain rows across blocks.
D .False. Chained rows may span blocks but aren't required to.
E .False. Inserts don't migrate; they chain if too large initially.
質問 # 29
Which three statements are true about using SQL*Plus?
- A. It has both command-line and graphical user interfaces (GUI).
- B. It has its own commands that are separate from any SQL statements.
- C. It can run scripts passed to it by a shell script.
- D. It can run Recovery Manager (RMAN) commands.
- E. It must be downloaded from the Oracle Technology Network (OTN).
- F. It can run scripts entered at the SQL prompt.
正解：B、C、F
解説：
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.
質問 # 30
Which two statements describe why Database Auditing is a security requirement?
- A. To protect against data theft by a non-authorized user.
- B. To protect against data corruption.
- C. To monitor proper usage of the system and data by privileged users.
- D. To monitor suspicious activity.
- E. To alert DBAs about system issues.
正解：C、D
解説：
A .True. Auditing tracks suspicious actions.
B .False. That's monitoring, not auditing.
C .False. Auditing detects, doesn't prevent.
D .False. Corruption is a reliability issue.
E .True. Ensures privileged user compliance.
質問 # 31
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