1z0-182 Oracle Database 23ai Administration Associate exact Exam Questions

Oracle Database 23ai Administration Associate

Last Update 3 hours ago Total Questions : 94

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Question # 1

Which two are benefits of external tables?

They support DELETEs, which transparently deletes records in the file system as if they were table rows.

They can be queried while the database is in the MOUNT state like dynamic performance views.

They support UPDATEs, which transparently updates records in the file system as if they were table rows.

They can be queried, transformed, and joined with other tables without having to load the data first.

The results of a complex join or aggregating function or both can be unloaded to a file for transportation to other systems.

Question # 2

You execute this command: [oracle@host01 ~]$ expdp system/oracle FULL=Y DUMPFILE=exp_db_full.dmp PARALLEL=4 LOGFILE=exp_db_full.log JOB_NAME=exp_db_full. During the export operation, you detach from the job by using CTRL+C and then execute this command: Export > STOP_JOB=IMMEDIATE. Are you sure you wish to stop the job ([yes]/no): yes. Which two statements are true about the job?

It continues to run in the background.

You cannot monitor it.

You can reattach to it and monitor it.

It terminates.

Question # 3

Which statement regarding PDBs (Pluggable Databases) is correct?

You can drop a PDB as long as it is not the PDB seed.

You cannot drop a source PDB of a refreshable PDB.

You can drop an application root along with the associated PDBs.

When the relocation of a PDB is finished, the source PDB must be dropped.

Question # 4

What are Oracle Database Metrics?

Oracle Database Metrics monitor performance using thresholds to generate alerts.

Oracle Database Metrics are part of the Oracle Database Notification system to email information about major database events.

Oracle Database Metrics are a set of measured statistics per unit of time (per second), transaction, or sessions that are used to evaluate performance.

Oracle Database Metrics are part of Oracle Enterprise Manager Cloud Control ' s Notification system used to email alerts.

Oracle Database Metrics are a set of statistics built in Oracle Enterprise Manager Cloud Control and used for automation.

Question # 5

Which statement is true about the PDB_DBA role granted to a local user during the creation of a new PDB?

The role has the privileges to administer the PDB.

The role has the privileges to perform DDL operations on all local schema objects.

The role has the privileges to create and manage users within the PDB.

No privileges are provided with the PDB_DBA role.

Question # 6

Which two statements are true about database instances and Real Application Clusters (RAC)?

A RAC database must have two or more instances.

A RAC database can have one instance.

A RAC database must have three or more instances.

A RAC database can have instances on separate servers.

Two RAC databases can share their instances.

Question # 7

Which three actions are ways to apply the principle of least privilege?

Enabling Unified Auditing.

Revoking execute privilege on UTL_SMTP, UTL_TCP, UTL_HTTP, and UTL_FILE from the roles/users (assuming typo for duplicate option).

Using Access Control Lists (ACLs).

Setting the O7_DICTIONARY_ACCESSIBILITY parameter to TRUE.

Setting the REMOTE_OS_AUTHENT parameter to TRUE.

Question # 8

Which three tasks are performed by background processes in an Oracle database instance?

Creating dedicated server connections.

Registering services with Oracle Net listeners.

Writing redo to log files.

Writing dirty database block images from the buffer cache.

Reading database blocks into the buffer cache.

Question # 9

Which two statements describe how Optimizer Statistics are collected?

Optimizer Statistics are collected automatically by an automatic maintenance job that runsduring predefined maintenance windows.

Optimizer Statistics are collected in real-time as data is inserted, deleted, or updated.

Optimizer Statistics can be manually collected at multiple levels using DBMS_STATS.GATHER_*_STATS PL/SQL procedures.

Optimizer Statistics are collected by the Statistics Advisor.

Optimizer Statistics are collected automatically by Automatic Workload Repository (AWR) Snapshot.

Answer:

A, 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.

Explanation: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.

Explanation: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.

Explanation: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.

Explanation: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.

Explanation: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.

[References:Oracle Database SQL Tuning Guide 23ai, "Managing Optimizer Statistics"; Oracle Database PL/SQL Packages and Types Reference 23ai, "DBMS_STATS Package.", , ]

Question # 10

Which two statements describe why Database Auditing is a security requirement?

To monitor suspicious activity.

To alert DBAs about system issues.

To protect against data theft by a non-authorized user.

To protect against data corruption.

To monitor proper usage of the system and data by privileged users.