Free Oracle 1z0-1093-25 Practice Exam with Questions & Answers | Set: 3

Using MySQL Replication for Minimal Downtime:

Replication allows forreal-time synchronizationbetween the source MySQL instance and theHeatWave instance. Once the replication catches up, performing aswitchoverto the HeatWave instance ensures minimal disruption.

This method is especially effective forlarge databases, as data is continuouslysynchronized 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.

A. Block Volumes provide the primary storage and are directly attached to the VM.

Block Volumes:

These are persistent, durable block storage volumes that are attached to the VM instance.

Used to store database datafiles, redo logs, and other database-related files.

Standard and most common way to provision storage for BaseDB VMs.

Why the other options are incorrect:

B. Object Storage as the default for database datafiles:Object Storage is used for backups and unstructured data, not the primary database files.

C. Local NVMe as the default:Local NVMe provides high performance but is not always the default. Block Volumes are standard.

D. File Storage is mandatory for backups:Not mandatory. Block Volumes or Object Storage can also be used.

RCU Calculation:

Read Capacity Units (RCUs) are determined based ondata size (average record size), read frequency (number of reads per second), and consistency level (eventual vs. strong consistency). Complex security roles do not impact the calculation because they do not directly influence the amount of data read or the frequency of access.

Why the other options are correct:

A:Larger record sizes increase RCU requirements.

B:Higher read frequency demands more RCUs.

D:Strong consistency requires more read operations compared to eventual consistency.

C. Underlying database architecture and scalability characteristics:

Thearchitecture and scalabilityof Oracle NoSQL Database Cloud Service are inherent to the platform and do not change based on the SDK.

SDKs are designed to providelanguage-specific interfacesfor data interaction but do not alter the core architecture.

Whether using Java, Python, or another SDK, the database'ssharding, replication, and consistencycharacteristics remain constant.

Why the other options are impacted:

A. Query syntax:SDKs may offer different syntax or query formats.

B. Authentication method:Varies between SDKs, e.g., API keys vs. IAM tokens.

D. Error handling:Each SDK may implement error handling differently, influencing how exceptions are processed.

C. Unnecessary cost expenditure:

In Oracle NoSQL Database Cloud Service, you pay for the provisioned RCUs regardless of actual usage.

Consistently underutilized RCUs mean that you are incurring costs without fully utilizing the allocated resources.

Proper capacity planning is crucial to optimize costs.

To reduce expenses, monitor utilization and adjust RCUs accordingly.

Why the other options are incorrect:

A. Improved query performance:While having adequate RCUs prevents throttling, over-provisioning does not inherently enhance performance.

B. Increased storage efficiency:Storage is independent of RCUs, which relate to read throughput.

D. Reduced data durability:Durability is not impacted by underutilized read capacity.

Block Change Tracking (BCT):

Enabling BCT withRMANsignificantly speeds upincremental backupsby recording changes made to data blocks since the last backup. Instead of scanning the entire database to detect changes, RMAN consults theblock change tracking fileto identify modified blocks, reducing backup time and I/O.

BCT is especially beneficial in large databases where full backups would be time-consuming and resource-intensive. Incremental backups become more efficient, makingdaily or more frequent backups feasible.

Why the other options are incorrect:

A:Full backups are still required periodically.

C:Encryption is separate from BCT functionality.

D:Point-in-time recovery is facilitated by backup logs, not BCT directly.

E:Integrity checks are performed during validation, not as part of BCT.

Recommended Patching Order:

In Oracle environments, it is crucial to patchGrid Infrastructure (GI) firstbecause GI components are responsible formanaging cluster resources and storage. Applying GI patches before database patches ensures that the underlying infrastructure is compatible and stable.

After the GI patching,validatethe environment to ensure all components are functioningcorrectly before proceeding with database software updates.

This order minimizes the risk ofdowntime or compatibility issues.

Why the other options are incorrect:

A:OCI does not automatically handle manual patching in non-managed DB systems.

B:Applying the database patch first may result in compatibility problems.

D:Users can manually patch Grid Infrastructure in BaseDB VMs.

C. Each data item is uniquely identified by a key, and the associated value can be any data type or structure.

Key-Value Data Model:

The key-value model is fundamentally based on a simple association between a unique key and its corresponding value.

The value can be a simple data type (string, number) or a complex structure (like JSON).

Oracle NoSQL Database Cloud Service uses this model to ensure efficient, scalable data access.

Why the other options are incorrect:

A. Organized into tables with schemas:This represents a relational database model.

B. Stored as JSON documents:Although NoSQL can store JSON, the fundamental model is still key-value.

D. Relationships defined through foreign keys and joins:This is typical of relational databases.

E. Graph format with nodes and edges:Represents a graph database model, not key-value.

A. Secure Communication Channel:

The Oracle Management Agent acts as a bridge between theDatabase Management Serviceand the database.

Enables secure data collection, monitoring, and performance analysis.

Uses encryption to protect data during transmission.

Facilitates monitoring, alerting, and management through OCI services.

Why the other options are incorrect:

B. Backup and recovery operations:These are typically handled by backup tools, not the management agent.

C. OS management:The agent does not manage the operating system itself.

D. Patching and upgrades:While it can assist, it is not specifically designed for patch management.