Free Oracle 1z0-1093-25 Practice Exam with Questions & Answers

Tagging in Database Management:

Tags in Oracle Cloud Infrastructure are essential fororganizing and managing resources.

Grouping Databases (A):Tags allow databases to be grouped logically, simplifying management and performance analysis.

Filtering and Searching (C):Tags make it easier to find specific databases within theDatabase Management console, improving efficiency in large environments.

Why the other options are incorrect:

B:Tags do not propagate automatically; they must be configured properly.

D:Tags are actively used in Database Management for organizing and filtering.

Scaling Out:

Scaling out in Exadata means increasing thenumber of database server VMs and storage serversto handle a larger workload. This is achieved byadding more compute nodesand storage cells, allowing the system todistribute database processingacross multiple nodes.

This horizontal scalability is ideal for environments with fluctuating workloads or growing data volumes. It improvesquery performance and fault tolerancesince data and workload are distributed across more hardware resources.

Why the other options are incorrect:

A:Increasing CPU cores within a single VM is consideredscaling up.

C:Upgrading the database software version is unrelated to scaling.

D:Increasing RAM is also a form of scaling up, not scaling out.

B. Ensure all user accounts and privileges are compatible with MySQL 8.0:

MySQL HeatWaveis based onMySQL 8.0, so compatibility is crucial.

User accounts and privileges must be updated to match the security and syntax requirements of MySQL 8.0.

If any incompatibility is detected, the accounts should be recreated on the target HeatWave instance.

Typical issues include changes inpassword hashing algorithms,privilege structure, androle management.

Why the other options are incorrect:

A. Resetting passwords to default:Risky from a security perspective and unnecessary.

C. Deleting user accounts except root:This drastically limits access and disrupts database operations.

D. External authentication (LDAP):Not mandatory or relevant to compatibility with HeatWave.

E. Merging accounts into a single 'admin':Violates best practices for user management and security.

B. Automated Patching via OCI Console/API:

Oracle Cloud Infrastructure offers automated patching tools specifically designed for Exadata Database Service.

These tools coordinate patching across database and storage servers, ensuring consistency.

Features include rolling patching to minimize downtime.

Automation significantly reduces human error and ensures that both database and storage servers are patched efficiently.

Why the other options are incorrect:

A. Manual patching:Prone to errors and time-consuming, especially for complex Exadata environments.

C. Default OS auto-update:Insufficient for comprehensive patching of Exadata components.

D. Ignoring storage servers:Unsafe and could lead to security vulnerabilities.

VCN Requirement:

AVirtual Cloud Network (VCN)is essential for creating a BaseDB VM instance because itprovidesnetwork connectivityandIP addressing. Subnets and security rules define the access policies and network segmentation.

Without a VCN, the VM instance cannot communicate with other resources or external networks.

Why the other options are incorrect:

A:Data Guard can be configured after provisioning.

B:Backup policies are important but can be set up later.

D:Oracle GoldenGate replication is optional and not required at the time of provisioning.

B. Masking or anonymizing sensitive data:

Data privacy regulations (likeGDPR,HIPAA) mandate thatpersonally identifiable information (PII)is protected, even in non-production environments.

Cloning a database without masking sensitive data could expose confidential information to unauthorized users.

Techniques include:

Data masking:Replacing real data with realistic, but non-sensitive values.

Data anonymization:Irreversibly removing personally identifiable information.

Why the other options are incorrect:

A. Matching compute shape:Relevant to performance, not privacy.

C. Using the same database version:Important for compatibility, but not related to data privacy.

D. Same NSG rules:Important for network security, but does not directly address data exposure.

E. Off-peak scheduling:Minimizes disruption but does not address data protection.

HeatWave as a Query Accelerator:

HeatWave enhances theMySQL Database Serviceby providing anin-memory, massively parallel query accelerator. It is specifically designed to speed upanalytical (OLAP) queries, making them run significantly faster compared to using MySQL alone.

The system stores data in acolumnar formatand processes it in memory, utilizingdistributed, parallel processingto achieve high performance.

Unlike traditional MySQL setups, HeatWave canexecute complex analytical workloadsefficiently.

Why the other options are incorrect:

A:HeatWave is not a standalone database but an extension of MySQL.

C:It is optimized foranalytical workloads, not transactional.

D:It is more than just a caching layer; it actively processes queries.

E:HeatWave clusters do not split MySQL instances but enhance query processing.

C. Accessing data using the unique key:

Oracle NoSQL Database Cloud Service follows akey-value data model.

Data is accessed directly using aunique key, which is highly efficient for lookups.

The value associated with the key can be simple or complex (e.g., JSON objects).

Provides fast read and write operations.

Why the other options are incorrect:

A. SQL with joins:Typical of relational databases, not NoSQL.

B. Graph traversal:Relevant to graph databases, not key-value stores.

D. Full-text indexing:Not the primary access method in key-value databases.

E. Predefined schema:NoSQL databases generally supportschema-lessdata storage.

Full Backup with bkup_api:

The --full flag in thebkup_api commandensures that the backup includesall datafiles and control files. This command is essential for creating acomplete, consistent backupsuitable for recovery purposes.

The backup is stored inOCI Object Storage, leveraging cloud scalability and redundancy.

The --dbname parameter specifies which database to back up.

Why the other options are incorrect:

A:This command may initiate a default backup, not a full one.

B:Specifying files individually is less efficient than using --full.

D:The --all option does not necessarily imply a full backup.

Performance Hub Real-Time SQL Monitoring:

ThePerformance Hubin Oracle Database Management provides detailed real-time monitoring of SQL queries, including:

Physical Reads (A):Measures the number of physical I/O operations performed by a SQL statement.

Average Active Sessions (B):Reflects the number of sessions actively performing database operations, giving insights into workload and bottlenecks.

These metrics help database administratorsanalyze query performanceand detect issues in real-time.

Why the other options are incorrect:

C:Number of CPUs is a hardware metric, not part of SQL monitoring.

D:Database version is static information, not a performance metric.