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

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.

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.

Table Rate Limiting:

Table rate limiting ensures that no single table monopolizes system resources, maintainingoverall stability and performancein a multi-tenant environment. This feature is crucial for cloud services where numerous applications may share the same database infrastructure. It helps maintain fair access by capping the number of read/write operations per second.

Why the other options are incorrect:

A:ACID compliance is achieved through consistency settings, not rate limiting.

C:Schema optimization is not related to rate limiting.

D:Rate limiting controls IOPS (Input/Output Operations Per Second), not storage space.

Backup Retention Policy:

When aBaseDB system is terminated, automatic backups are not immediately deleted. Instead, they remain stored inOCI Object Storagefor the duration specified by thebackup retention policythat was configured at the time of database creation.

This approach ensures that data can be recovered even after the database instance itself is terminated.

Administrators can manually delete backups if they are no longer needed, but they arenot automatically purged.

Why the other options are incorrect:

A:Backups are not deleted instantly upon termination.

B:All backups are retained as per the policy, not just the most recent.

D:No automatic migration to archive tier occurs.

E:Backup retention settings are defined during provisioning, but not dynamically configurable after termination.

HeatWave's Processing Model:

HeatWave usescolumnar in-memory processingto optimize analytical workloads. Storing data in columns rather than rows allows HeatWave toprocess large datasets efficiently, reducing the volume of data scanned and improving query performance. This is crucial for OLAP operations that involveaggregating and analyzing data.

Why the other options are incorrect:

A:Row-based processing is typical for OLTP workloads, not analytical.

B:HeatWave operates primarily in memory, not disk.

D:Indexing enhances performance but is not the primary processing paradigm.

E:Key-value processing is typical in NoSQL databases, not analytical systems.

HeatWave's Columnar Processing:

HeatWave improves OLAP performance by storing data in acolumnar formatin memory. This format is particularly efficient foranalytical queriesbecause:

It minimizes the amount of data read by only scanning thenecessary columns.

Columnar storage supportsvectorized processing, which significantly speeds up aggregation operations.

Beingin-memory, it eliminates disk I/O bottlenecks, crucial for high-speed analytics.

Why the other options are incorrect:

A:Indexing is useful, but columnar storage is the primary driver of speed.

C:Caching improves access times but does not address the fundamental OLAP challenge of processing large datasets.

D:HeatWave distributes workload usingparallel processing, not simple sharding.

E:AI-powered indexing is not a core feature of HeatWave.

B. Manual patching for GI and ASM:

In auser-managed environment, the DBA is responsible for downloading and applying patches forGrid Infrastructure (GI)andAutomatic Storage Management (ASM).

These patches are distinct fromdatabase patchesand need to be applied using tools likeopatchorOracle Universal Installer (OUI).

The process involves:

Downloading the patch from Oracle Support.

Staging the patch on the server.

Applying the patch using the appropriate commands.

Why the other options are incorrect:

A. Fully automated by OCI:OCI does not automatically patch GI and ASM in user-managed environments.

C. Integrated with database patching:GI and ASM patching is handled separately.

D. Required only during OS upgrade:Incorrect, as patching is required independently for security and stability.

C. Define VCN, Private Client subnet, and Private Backup subnet:

These network components are necessary to ensure secure connectivity and backup configurations.

TheVCN (Virtual Cloud Network)provides network isolation.

ThePrivate Client subnetenables secure client connections.

ThePrivate Backup subnetis required for secure access toOCI Object Storagefor backups.

E. Create Exadata Infrastructure and VM Cluster resource:

Exadata Infrastructure represents the physical hardware.

VM Cluster resource defines compute and storage resources for the databases.

Both must be set up before provisioning the actual database instance.

Why the other options are incorrect:

A. VCN and Universal Cloud Credits:Insufficient; more configuration is needed.

B. Service Backup subnet:Incorrect, it should be aPrivate Backup subnet.

D. No prerequisites:Incorrect; prerequisites include both network and infrastructure setup.

Trade-offs with NoSQL Databases:

NoSQL databases are designed toscale horizontallyby adding more nodes rather than scaling vertically by increasing hardware capacity. To achieve this scalability andhigh availability, NoSQL systems often adopt theBASE model(Basically Available, Soft state, Eventually consistent) rather than the strictACID model(Atomicity, Consistency, Isolation, Durability) typical of relational databases.

This means thatdata consistencymay be relaxed (eventual consistency) to allow faster reads and writes.

These characteristics make NoSQL suitable forlarge-scale, distributed systemsbut less ideal for applications requiringimmediate consistency, such as banking systems.

Why the other options are incorrect:

A:NoSQL does not guarantee stronger consistency than relational databases.

C:NoSQL typically does not offer superior data integrity for transactional workloads.

D:SQL-based querying is usually not available in NoSQL, as they often have their own query mechanisms.

Database Management Prerequisites:

To enable Database Management, the following are necessary:

A:The database must be running to collect metrics.

B:IAM policies must grant access to the management service.

D:The Oracle Management Agent must be configured to collect data.

However,automatic backupsare not a requirement for enabling Database Management, as the service focuses onperformance monitoring and management, not data recovery.

Why the other options are correct:

Ensuring the database is running and accessible is essential for monitoring.

Proper IAM policies are crucial for security and data access.

The Management Agent facilitates data collection.