Free Oracle 1z0-931-25 Practice Exam with Questions & Answers | Set: 4

Oracle Autonomous Container Database (ACD) provides specific options for managing quarterly maintenance updates to ensure minimal disruption and flexibility. The three correct operations available are:

Reschedule and patch immediately (B):This option allows users to adjust the maintenance window to a more convenient time and apply the patch right away within that rescheduled window. It’s useful when the default schedule conflicts with business operations but immediate patching is still desired.

Reschedule patching (C):This option enables users to defer the patching to a later maintenance window that suits their operational needs, providing flexibility without applying the patch immediately.

Skip patching (D):Users can choose to skip a quarterly maintenance update entirely, which is beneficial if the current database version is stable and no immediate updates are required. Oracle allows skipping up to two consecutive quarterly updates for Autonomous Container Databases on dedicated infrastructure.

The incorrect options are:

Patch immediately (A):This is not a standalone option for quarterly updates on ACDs. Patching occurs within scheduled maintenance windows, and immediate patching outside of rescheduling is not supported as a distinct choice.

Apply a partial patch (E):Oracle does not support applying partial patches during quarterly maintenance updates. Updates are delivered as complete bundles to ensure consistency and security.

This aligns with Oracle’s maintenance policies for Autonomous Databases on dedicated infrastructure, where control over scheduling and skipping is provided, but partial patching is not an option.

Auto scaling in Autonomous Database dynamically adjusts OCPU usage up to three times the base allocation. Let’s evaluate each statement:

Correct Answer (C): “The base number of OCPU cores allocated to a database is not guaranteed” isfalse. The base OCPU count, set during provisioning or manual scaling, is always guaranteed as the minimum available resource, even with auto scaling enabled. Auto scaling only increases usage above this baseline when needed.

True Statements:

A: On dedicated Exadata, the max cores for auto scaling are constrained by available free cores not used by other databases, ensuring resource fairness.

B: The total cores in the Exadata instance define the upper limit for any database’s auto scaling capacity.

Full Detailed In-Depth Explanation:

Maintenance on dedicated infrastructure:

A:True. You can adjust maintenance windows for container databases.

B:False. Exadata Infrastructure maintenance (e.g., OS, grid patching) is separate from container database patching, which occurs independently.

C:True. Oracle reschedules missed maintenance to the next quarter.

D:True. Infrastructure maintenance occurs quarterly.

Cloning in Autonomous Database creates a new instance from an existing source:

Correct Answer (A): “A clone database source can be a running database instance” is true. You can clone from a live, running Autonomous Database instance (full clone), capturing its current state, including data and configuration, without needing to stop it.

Incorrect Options:

B: There are multiple cloning types: full clone (from a running instance) and refreshable clone (a read-only copy that syncs with the source), plus cloning from backups.

C: Cloning from a backup requires the backup to be at least 2 hours old for consistency, not less, making this false.

Migrating a PDB to Autonomous Database has limitations:

Correct Answer (B): “PDBs cannot be migrated to an Autonomous Database using plug, unplug, or clone” is true. Autonomous Database does not support direct plugging/unplugging of PDBs due to its managed architecture and differing storage/backup mechanisms.

Incorrect Options:

A: Unplugging into an XML file is valid for traditional PDBs, but Autonomous Database doesn’t accept this for migration.

C: Cloning via database link isn’t a standard method; it’s more aligned with replication tools like GoldenGate.

Autonomous Data Guard on Shared Infrastructure enhances ADB availability with standby databases. The two correct actions are:

Switchover (C):A switchover swaps roles between the primary and standby databases in a planned manner, with no data loss (RPO = 0). You initiate this via the OCI console (e.g., “Switchover” button on the primary ADB’s Data Guard section) or API (e.g., oci db autonomous-database switchover). For example, before maintenance on the primary, you switch to the standby in another region (e.g., from us-ashburn-1 to us-phoenix-1), taking ~2minutes (RTO ≈ 2 min). This ensures continuity without downtime, as the standby becomes primary seamlessly.

Failover (D):A failover promotes the standby to primary during an unplanned outage (e.g., primary region failure), also with RPO = 0 due to synchronous replication. Trigger it via the OCI console (e.g., “Failover” on the standby) or API (e.g., oci db autonomous-database failover). For instance, if us-ashburn-1 crashes, the standby in us-phoenix-1 takes over in ~2 minutes, preserving all committed transactions. It’s automatic in some cases (e.g., severe failure), but manual initiation is supported too.

The incorrect options are:

View Apply Lag (A):While relevant in traditional Data Guard (measuring replication delay), Autonomous Data Guard on shared ADB uses synchronous replication (zero lag), and apply lag isn’t a user-actionable metric exposed in the UI—monitoring focuses on role status, not lag.

Reinstate (B):Reinstatement (restoring a failed primary as a standby) isn’t a user action in shared infrastructure. Oracle manages post-failover recovery, and users can’t manually reinstate; a new standby might be provisioned instead.

Change Protection Mode (E):Traditional Data Guard offers modes (e.g., Maximum Availability), but in Autonomous Data Guard on shared infrastructure, the mode is fixed (synchronous, akin to Maximum Availability), and users can’t modify it—control is limited to switchover/failover.

These actions ensure high availability with user-initiated role changes.

Full Detailed In-Depth Explanation:

When provisioning an Autonomous Database (ADB) on dedicated infrastructure, the placement within the infrastructure is critical:

A. Listener endpoint:Incorrect. This is for connectivity, not placement.

B. Client Credentials wallet:Incorrect. This is for secure connections, not determining location.

C. The container database in which the Autonomous instance should run:Correct. On dedicated infrastructure, an Autonomous Container Database (ACD) hosts multiple ADB instances. Selecting the ACD during provisioning determines where the ADB resides, affecting resource allocation and isolation.

D. The compartment:Incorrect. Compartments organize resources in OCI, but multiple ACDs can exist within a compartment, so this doesn’t pinpoint the exact location.

Choosing the ACD is a key provisioning step for dedicated deployments.

The client credentials wallet for connecting to an Oracle Autonomous Database contains specific files required for secure connectivity. These files are downloaded from the OCI Console when you generate a wallet:

Correct Answer (A): protocol.ora is not a standard component of the client credentials wallet. It is typically used in traditional Oracle Database setups to define protocol parameters (e.g., TCP vs. IPC), but in Autonomous Database, such details are managed by Oracle and embedded within other wallet files like ewallet.p12.

Included Files:

B. ewallet.p12: Contains the encrypted private key and certificates for authentication.

C. sqlnet.ora: Specifies network configuration details (e.g., wallet location, encryption settings).

D. keystore.jks: A Java KeyStore file for Java-based applications to authenticate with the database.

When enabling auto scaling in an Oracle Autonomous Database, the feature dynamically adjusts resources based on workload demand, but certain configuration elements remain unchanged unless manually altered.

Amount of storage (A): Auto scaling focuses on adjusting CPU and I/O resources to meet performance needs. The storage allocation remains constant because it is a separately provisioned resource that requires manual adjustment via the OCI Console or API. This ensures that storage capacity is not inadvertently reduced or expanded without explicit user intent.

Parallelism settings (B): These settings determine how many parallel processes are used for query execution. Auto scaling does not modify this pre-defined configuration; it adjusts resource usage (e.g., CPU cores) without altering the parallelism framework established for the database.

Level of concurrency (E): Concurrency refers to the maximum number of simultaneous user sessions. While auto scaling can indirectly influence concurrency by adjusting available resources, the concurrency limit itself is a fixed setting that remains unchanged unless explicitly modified by the administrator.

Incorrect Options:

I/O resources (C): Auto scaling directly impacts I/O resources by increasing or decreasing them alongside CPU adjustments to handle workload fluctuations.

Provisioning dedicated Exadata Infrastructure resources for Autonomous Database follows a specific hierarchical order:

Fleet Administrator, Autonomous Exadata Infrastructure -> Autonomous Container DB -> Database Administrator -> Autonomous DB (A):

Fleet Administrator provisions Autonomous Exadata Infrastructure:The Fleet Administrator, responsible for infrastructure management, first sets up the Autonomous Exadata Infrastructure (AEI), which includes the physical Exadata hardware and networking configuration.

Fleet Administrator provisions Autonomous Container DB (ACD):Within the AEI, the Fleet Administrator creates the ACD, a container that hosts multiple Autonomous Databases.

Database Administrator provisions Autonomous DB:Finally, the Database Administrator (DBA) provisions individual Autonomous Databases within the ACD, configuring them for specific workloads (e.g., ATP or ADW).

The incorrect options are:

B:The Database Administrator cannot provision the ACD before the AEI is set up by the Fleet Administrator.

C and D:The Database Administrator does not provision the AEI or ACD; these are infrastructure-level tasks handled by the Fleet Administrator.

This order ensures proper separation of infrastructure and database management responsibilities.