1Z0-997-26 Practice Test 2 — 25 Questions

Question 1

You are designing a serverless event-driven architecture on OCI using OCI Events, OCI Notifications, and OCI Functions. Which THREE actions are valid capabilities when integrating these services? (Choose three.)

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

OCI Notifications can publish messages to email, PagerDuty, or HTTPS endpoints triggered by service alarms or events.. OCI Events can trigger OCI Functions directly, OCI Notifications can publish messages to email/HTTPS endpoints, and OCI Functions can be invoked synchronously or asynchronously via OCI Events.

Answer

OCI Functions can execute indefinitely without any timeout restrictions up to 24 hours.

Answer

An OCI Function can be configured to invoke an OCI Database directly over a public IP without any VCN security configurations.

Question 2

Which THREE strategies can be implemented in OCI to mitigate the impact of a regional availability outage on a multi-tier web application? (Choose three.)

Accepted Answer

Deploying application tiers across two OCI regions with DNS Traffic Management health checks for automated failover. Mitigating regional outages requires multi-region deployments with DNS traffic steering, database replication (Data Guard), and cross-region storage/compute readiness.

Answer

Relying on a single Availability Domain deployment with automated daily backups

Answer

Running all database write operations simultaneously against both regions with synchronous multi-master locking over public internet

Question 3

You are planning to migrate an Oracle Database to OCI using Zero Downtime Migration (ZDM). Which underlying Oracle migration technology does ZDM orchestrate behind the scenes for large databases requiring physical migration?

Accepted Answer

Oracle RMAN and Oracle Data Guard. OCI Zero Downtime Migration (ZDM) orchestrates native Oracle migration tools such as RMAN, Data Guard, and Data Pump depending on the workflow chosen (physical vs logical).

Answer

OCI Object Storage lifecycle policies exclusively

Answer

Third-party ETL pipelines and CSV flat file generation

Answer

MySQL Enterprise Backup and InnoDB replication

Question 4

An Oracle Cloud Infrastructure (OCI) architect is designing a high-availability web tier across multiple Availability Domains (ADs) within a single region. Which component should be used to distribute incoming client traffic evenly across web server instances residing in different ADs?

Accepted Answer

An OCI Public Load Balancer configured with backend sets spanning multiple ADs.. An OCI Public Load Balancer is regional, meaning it spans all ADs in a region and can distribute traffic across backend servers located in different ADs, ensuring high availability.

Answer

An OCI Dynamic Routing Gateway (DRG) configured with equal-cost multi-path routing.

Answer

A Network Load Balancer restricted to a single Availability Domain subnet.

Answer

A primary Local Peering Gateway (LPG) connected to multiple VCNs.

Question 5

An architect is configuring Oracle Autonomous Database Disaster Recovery with cross-region Data Guard. The primary database is in Ashburn, and the standby is in Phoenix. You execute a switchover operation. What happens to the connection strings (such as tnsnames.ora entries) used by client applications?

Accepted Answer

Client connection strings remain valid; applications reconnect, and the regional endpoint automatically routes traffic to the new primary.. Autonomous Database uses regional service names and client credential wallets (tnsnames.ora) that automatically update or resolve to the active primary region during a switchover/failover, though client reconnection is required.

Answer

The database IP addresses change, requiring manual DNS A-record updates in OCI DNS.

Answer

You must manually regenerate new wallet zip files and redeploy them to all application servers.

Answer

Client applications must be rewritten to use hardcoded IP addresses instead of TNS names.

Question 6

When designing an enterprise-grade disaster recovery architecture on OCI, which THREE practices are recommended to ensure a successful failover and minimize operational risk during a disaster event? (Choose three.)

Accepted Answer

Automate failover orchestration using tools like OCI Full Stack Disaster Recovery.. Best practices include regularly testing DR plans via drills, automating workflows with FSDR or runbooks, and ensuring identical resource capacity in the DR region.

Answer

Disable all health checks on load balancers to prevent false alarms during failover.

Answer

Rely solely on manual documentation stored on local laptops for failover steps.

Question 7

Which OCI networking component is required to securely connect a VCN in one OCI region to a VCN in another OCI region for cross-region Data Guard database replication?

Accepted Answer

Dynamic Routing Gateway (DRG) with Remote VCN Peering. Remote VCN peering using Dynamic Routing Gateways (DRGs) in both regions connects VCNs across regions.

Answer

Internet Gateway (IGW)

Answer

NAT Gateway

Answer

Local Peering Gateway (LPG)

Question 8

Which OCI service can be used to monitor the health and performance of your load balancers and backend compute instances across multiple availability domains, triggering alarms if health checks fail?

Accepted Answer

OCI Monitoring service with Alarm definitions. OCI Monitoring service collects metrics and logs from resources like Load Balancers and Compute instances, allowing you to create alarms based on metric thresholds.

Answer

OCI DNS Traffic Management

Answer

OCI Audit service

Answer

OCI Vault service

Question 9

Which THREE factors should an architect evaluate when determining Recovery Point Objective (RPO) and Recovery Time Objective (RTO) for an OCI database disaster recovery solution? (Choose three.)

Accepted Answer

Level of automation configured for failover (e.g., Fast-Start Failover vs. manual scripts). RPO and RTO are driven by business tolerance for data loss, network throughput/latency constraints for replication, and the degree of automation (like FSFO or FSDR) applied to failover procedures.

Answer

The color scheme and layout of the OCI Console dashboard

Answer

The default tenant tenancy OCID string length

Question 10

An architect is designing a multi-region disaster recovery architecture for an application running on OCI Compute. The database layer uses Oracle Data Guard. For the application tier, what is the recommended approach to handle stateless application servers in the DR region?

Accepted Answer

Pre-provision compute instances in a stopped state or use instance pools with standby configuration, activating them during a disaster event.. Stateless application servers in the DR region can be pre-provisioned in a stopped state or dynamically provisioned using instance pools and autoscaling, reducing costs while maintaining readiness.

Answer

Run all application servers at full capacity in both regions simultaneously with active write locks.

Answer

Store application binaries solely in Object Storage and compile them on the fly using user-data scripts during failover.

Answer

Rely entirely on manual creation of compute instances via the OCI console after an outage occurs.

Question 11

An enterprise application uses an Oracle Exadata Database Service on Dedicated Infrastructure with Maximum Availability Architecture (MAA). A catastrophic regional disaster occurs, and you must initiate a failover to the standby region. What is the expected behavior of Active Data Guard during this process?

Accepted Answer

The standby database converts to the primary role, opens for read/write operations, and stops applying redo from the old primary.. During a failover, the standby database is transitioned to become the primary role, opening for read/write traffic while breaking the replication relationship with the former primary.

Answer

The standby database automatically initiates a flashback database operation to sync with object storage backups before opening.

Answer

Active Data Guard remains in read-only mode until a manual database restore command is issued.

Answer

The database becomes inaccessible until Full Stack Disaster Recovery automatically reprovisions the storage cells.

Question 12

You are configuring a Data Guard association between two Oracle Base Database Systems in different OCI regions. The primary database encounters an unplanned outage, and you perform a manual failover. What action must you take afterward if you wish to restore the original architecture with the old primary as the new standby?

Accepted Answer

Recreate or reinstate the former primary database (using Flashback Database or backup restoration) to convert it into a valid standby.. After a failover, the old primary database is no longer in sync and cannot act as a standard standby without being reinstated or rebuilt (e.g., using Flashback Database or re-creating the standby).

Answer

Run a simple 'SWITCHOVER' command to reverse roles without any data synchronization checks.

Answer

Modify the listener.ora file manually via SSH and restart the clusterware.

Answer

Delete the standby database and provision a brand-new VCN in the primary region.

Question 13

You are managing an Oracle Base Database Service instance and need to configure Data Guard to provide disaster recovery in another OCI region. Which prerequisite must be met before creating the Data Guard association?

Accepted Answer

Establish network connectivity between the primary and standby VCNs using a DRG and remote VCN peering.. Cross-region Data Guard requires remote VCN peering via a Dynamic Routing Gateway (DRG) or local peering if regional, and proper security list/NSG rules allowing traffic on ports such as 1521.

Answer

Ensure the standby database has a larger shape than the primary database.

Answer

Manually install the Oracle Data Guard binaries on the standby database compute instance prior to association.

Answer

Convert the primary database to an Autonomous Database instance.

Question 14

Your organization has a strict Recovery Point Objective (RPO) of 5 minutes and Recovery Time Objective (RTO) of 15 minutes for a multi-tier application. The database tier uses Oracle Data Guard. During a test drill, you notice that redo transport lag spikes to 8 minutes. What is the most likely architectural bottleneck causing this issue?

Accepted Answer

Inadequate cross-region network bandwidth or high latency causing redo transport congestion.. Redo transport lag exceeding RPO is frequently caused by insufficient network bandwidth or high latency between regions, preventing synchronous or fast asynchronous redo shipping from keeping pace with transaction volume.

Answer

Exceeded OCI Block Volume IOPS limits on the standby database's local NVMe scratchpad.

Answer

Misconfigured OCI IAM policy allowing read-only access to database backups.

Answer

Incorrect OCI Load Balancer SSL certificate configuration on the web tier.

Question 15

An application deployed across two OCI regions uses a DNS-based traffic management steering policy. A database failure occurs in the primary region, and the application must failover to the secondary region. What is the primary limitation of relying solely on DNS Traffic Management for disaster recovery failover?

Accepted Answer

Client-side caching and DNS TTL expiration delays can cause continued traffic routing to the failed region.. DNS failover relies on TTL (Time to Live) values, which can cause clients to continue sending traffic to the failed primary region until the TTL expires, leading to a delay in RTO.

Answer

DNS steering policies cannot route traffic across different geographic regions.

Answer

DNS records are permanently immutable once created in OCI.

Answer

DNS routing requires public IP addresses to be configured on the database backends.

Question 16

An architect is configuring an OCI Full Stack Disaster Recovery plan. The plan includes a step to run a custom script on an application server during a failover drill. Which OCI service executes this custom script?

Accepted Answer

OCI Functions or OCI Compute instance run-command actions orchestrated by Full Stack DR.. OCI Full Stack Disaster Recovery integrates with OCI Functions or custom scripts executed via instance agent / run command to perform pre-checks and custom automation steps.

Answer

Oracle Autonomous Linux Auto-Update Daemon

Answer

OCI Resource Manager Terraform apply jobs exclusively

Answer

OCI Streaming Service consumer groups

Question 17

Which OCI storage service provides massively scalable, highly durable regional object storage that is ideal for storing database backups and disaster recovery artifacts?

Accepted Answer

OCI Object Storage. OCI Object Storage is a regional, highly durable service designed for unstructured data storage, frequently used for backups and DR.

Answer

OCI Block Volume

Answer

Local NVMe Scratch Disks

Answer

OCI Boot Volumes

Question 18

Which THREE strategies are recommended when planning a large-scale database migration (exceeding 100 TB) from on-premises to Exadata Database Service on Dedicated Infrastructure with minimal downtime? (Choose three.)

Accepted Answer

Leveraging Transportable Tablespaces (TTS) combined with RMAN cross-platform conversion. Large-scale database migrations exceeding 100 TB benefit from transportable tablespaces, physical standby creation via RMAN, and Zero Downtime Migration (ZDM).

Answer

Copying database files across the public internet using standard FTP without encryption

Answer

Exporting the entire 100 TB database into a single plaintext SQL script using SQL*Developer

Question 19

When designing high availability across multiple Availability Domains in an OCI region, how should database or application subnets be configured to ensure fault tolerance?

Accepted Answer

Create regional subnets so that instances can be placed across multiple Availability Domains.. Subnets in OCI can be regional or AD-specific. For high availability across ADs, architects should deploy regional subnets or span instances across multiple AD-specific subnets.

Answer

Restrict all subnets to a single Availability Domain to prevent cross-AD latency.

Answer

Disable security lists on subnets to allow uninterrupted cross-AD replication traffic.

Answer

Attach all VNICs directly to the Dynamic Routing Gateway without using subnets.

Question 20

An enterprise application hosted on OCI requires high availability across multiple fault domains within a single availability domain. Which resource placement strategy should you use for your application compute instances?

Accepted Answer

Distribute instances evenly across three different Fault Domains.. Fault domains provide anti-affinity within an availability domain. Distributing instances across different fault domains ensures they do not share physical hardware, power, or top-of-rack switch infrastructure.

Answer

Configure a dedicated virtual cloud network for each fault domain.

Answer

Attach all instances to separate Internet Gateways.

Answer

Place all instances in Fault Domain 1 to optimize network latency.