Get Oracle 1Z0-1093-25 Exam Practice Questions - Real and Updated

Answer : A, C

A . Generate recommendations for SQL plan baselines:

ADDM analyzes historical data and SQL execution plans, suggesting baseline adjustments to optimize performance.

Recommendations may include using an existing baseline or creating a new one.

C . Identify performance bottlenecks:

ADDM pinpoints issues related to:

I/O contention

CPU utilization

Memory bottlenecks

Locking issues

Helps DBAs understand which database components are causing slowdowns.

Why the other options are incorrect:

B . Automatically applying recommendations: ADDM only suggests actions; DBAs must manually review and implement them.

D . Creating indexes: ADDM does not create indexes automatically; it may suggest them, but implementation requires DBA action.

Oracle Database Management Documentation: ADDM Features

Answer : B

Responsibility of DBA:

Before upgrading the Oracle Database software on a BaseDB VM system, the DBA must verify that the underlying operating system version is compatible with the new database software version. This is crucial because Oracle Database upgrades may introduce new requirements or dependencies.

The DBA needs to check the Oracle Database Upgrade Guide and the Oracle Validated Configurations to ensure compatibility. Upgrading without this validation could lead to compatibility issues, failed upgrades, or reduced performance.

Why the other options are incorrect:

A: OCI manages the infrastructure, but the DBA must ensure compatibility.

C: While OCI manages the OS patching, ensuring compatibility is still a DBA responsibility.

D: OS updates should be addressed before the database upgrade, not afterward.

Oracle BaseDB Upgrade Documentation

Answer : D

D . Dropping the entire table:

Deleting a table is a destructive operation that permanently removes the data.

Requires the highest level of permissions due to the potential for data loss and disruption.

Usually restricted to administrators or highly privileged users.

Why the other options are incorrect:

A . Simple read operation: Basic permission, often granted to most users.

B . Inserting a row: Requires write permissions, but not as critical as table deletion.

C . Updating a row: Similar to insertion, modifies existing data but does not destroy the table.

Oracle NoSQL Database Cloud Service Documentation: IAM Permissions

Answer : C

Using MySQL Replication for Minimal Downtime:

Replication allows for real-time synchronization between the source MySQL instance and the HeatWave instance. Once the replication catches up, performing a switchover to the HeatWave instance ensures minimal disruption.

This method is especially effective for large databases, as data is continuously synchronized during the migration process.

The switchover itself incurs minimal downtime as the applications are redirected to the new instance.

Why the other options are incorrect:

A: mysqldump and restore are time-consuming for large datasets.

B: Physical backup and restore are faster than logical, but still involve significant downtime.

D: Direct data file copying is risky and may cause data corruption.

E: ETL processes are typically slow and prone to data consistency issues.

Oracle MySQL HeatWave Migration Guide

Answer : C

Understanding Throughput in NoSQL:

Throughput in NoSQL databases is influenced by factors like query complexity, workload type (read/write), and record size.

Higher query complexity (A): Complex queries involving aggregation or joins consume more read capacity.

Write-heavy workload (B): Writes inherently require more capacity units due to data modification and consistency checks.

Larger record sizes (D): More data per operation increases the read/write capacity needed.

Why C is incorrect:

C: Table scans involve reading large volumes of data, which increases throughput requirements rather than reducing them. Frequent table scans can overwhelm the system, especially with large datasets.

Oracle NoSQL Database Throughput Guidelines