1z0-1093-25 Exam Dumps - Oracle Cloud Infrastructure Questions and Answers

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.

Rate Limiting in NoSQL:

In Oracle NoSQL Database Cloud Service, rate limiting primarily controlsread and write throughput. This means defining themaximum number of read and write operations per secondthat a table can handle.

The goal is toprevent a single table from consuming excessive resources, ensuringfair allocationand system stability.

Why the other options are incorrect:

A:Storage capacity is managed via quotas, not rate limits.

C:CPU and memory are related to system resources, not table operations.

D:Indexing and query complexity are managed differently, often via query optimization.

Scaling HeatWave Efficiently:

TheOCI CLI or Consoleprovides a streamlined way to scale the HeatWave cluster. You can easily change theshape and node countthrough the console without significant downtime. The system handles the necessary data redistribution and configuration updates automatically.

This method minimizes disruption and is significantly faster than manual reconfiguration.

OCI’s automated scaling ensures that the cluster maintainsoptimal performancethroughout the operation.

Why the other options are incorrect:

A:Adjusting buffer size affects memory, not cluster size.

C:Changing VM shapes does not directly affect HeatWave.

D:Recreating the cluster is inefficient and time-consuming.

E:Manual export/import introduces downtime and is not efficient for scaling.

A. Generate recommendations for SQL plan baselines:

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

Recommendations may includeusing an existing baselineor 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.

C. Defines CPU, memory, and network bandwidth:

TheCompute Shapespecifies the resources allocated to the VM.

Shapes vary in the number ofOCPUs, amount ofRAM, andnetwork performance.

Selecting an appropriate shape ensures the database has enough computational power and memory to meet workload demands.

Why the other options are incorrect:

A. Number of databases:Limited by storage and resource capacity, not the shape itself.

B. Availability domain:Chosen separately during provisioning.

D. Pre-installed software version:The shape does not determine the database version.

Database Software Upgrade:

When upgrading theOracle Database software versionon aBaseDB VM, a newOracle Homeis created to house the upgraded software. Once the database is moved to this new home, the process isnot easily reversible.

Rolling back would requiredowngrading, which is a complex and risky process.

The new Oracle Home ensures that the upgraded database environment isisolated from the previous version, preventing compatibility conflicts.

Why the other options are incorrect:

A:Grid Infrastructure upgrades can be managed independently of the database upgrade.

B:Scaling VMs is a reversible operation.

D:OS patches do not impact the Oracle Home directly.

E:ASM configuration changes are reversible.

A. MySQL Query Optimizer:

TheMySQL Query Optimizerdetermines whether a query can benefit from HeatWave’s in-memory, columnar processing.

If a query is deemed suitable, it is automatically offloaded to the HeatWave cluster.

This process significantly improves the execution speed of complex analytical queries.

Why the other options are incorrect:

B. HeatWave AutoPilot:Manages workload optimization but does not directly offload queries.

C. MySQL Router:Manages connection routing, not query offloading.

D. MySQL Shell:Primarily used for administrative tasks, not query optimization.

E. OCI Load Balancer:Manages network traffic distribution, unrelated to database query processing.

B. Compare SQL performance before and after changes:

SPA evaluates the effect of configuration changes, upgrades, or patches on SQL performance.

Provides insights into whether a change improves or degrades query performance.

C. Generate performance impact reports:

SPA generates reports summarizing the effects of specific changes on SQL workload performance.

Helps DBAs make informed decisions before implementing changes in production.

Why the other options are incorrect:

A. Automatically rewriting SQL:SPA does not modify queries; it only analyzes and compares performance.

D. Suggesting indexing strategies:SPA evaluates performance impacts, but indexing recommendations are made by the SQL Tuning Advisor.

B. Testing patches in a non-production environment:

Critical to ensure that the patch does not introduce performance issues or compatibility problems.

Best Practice:Apply the patch to astaging environmentthat mirrors production, validate stability, and then proceed to production.

Minimizes the risk of unplanned downtime or disruptions.

Why the other options are incorrect:

A. Immediate application in production:Risky as untested patches might cause outages.

C. Automatic patching by OCI:OCI does not automatically apply database patches; the customer must manage this.

D. Patching the standby and failing over:While a good strategy when applicable, it still requires prior testing.