Oracle 1z0-1093-25 - Oracle Cloud Database Services 2025 Professional

B. Using Data Guard for physical standby and switchover:

This method enablesminimal downtimemigration.

Steps:

Configure Data Guard to synchronize thestandby databasewith the primary on-premises database.

Once synchronized, perform aswitchoverto make the standby the new primary.

Downtime is limited to the switchover duration.

This approach leveragesreal-time replicationto minimize disruption.

Why the other options are incorrect:

A. Export/Import with Data Pump:Too time-consuming for large databases.

C. Full backup and restore:High downtime due to the time required for data transfer and restoration.

D. Copying via SQL Developer:Not feasible for mission-critical and large databases due to slow transfer speeds.

C. CSV, Parquet, and Avro files:

HeatWave Lakehousecan directly query data stored inOCI Object Storagewithout loading it into MySQL.

Supports widely-used data formats:

CSV (Comma Separated Values): Simple, text-based data format.

Parquet: Columnar storage format optimized for analytical queries.

Avro: Row-oriented format used for data serialization.

This versatility allows integrating data from various sources and querying directly.

Why the other options are incorrect:

A. Only CSV files:HeatWave supports more than just CSV.

B. Only Parquet files:HeatWave also supports CSV and Avro.

D. Only JSON files:JSON is not directly supported by HeatWave Lakehouse.

E. Only XML files:XML is not directly supported.

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.

Detailed Flash Cache Monitoring:

The commandexadcli list metricdetail -cell -metricname "flashcache.*"provides acomprehensive overviewof all metrics related toSmart Flash Cache. This includes bothread and write operations, hit ratios, and IOPS statistics.

Themetricdetailoption retrieves in-depth data, crucial for performance troubleshooting.

Theflashcache.*wildcard captures all relevant metrics associated with the Flash Cache subsystem.

Why the other options are incorrect:

A:Limited to current IOPS and throughput, not specifically flash cache.

C:Too broad, as it includes general cell metrics.

D:Focuses only on historical read/write IOPS, not comprehensive.

Primary Distinction:

The primary difference betweenBaseDB on a VMandBare Metalis how the underlying hardware is allocated:

BaseDB on VM:The infrastructure issharedamong multiple tenants, using virtualization to isolate instances.

Bare Metal Database Service:The server'sphysical hardware is dedicatedexclusively to a single tenant, offeringmaximum performance and isolation.

This exclusive access to hardware in Bare Metal allows forbetter performanceand control compared to VM-based instances.

Why the other options are incorrect:

A:Binaries are not always pre-installed in both cases; it depends on the configuration.

B:Oracle handles hypervisor configuration, not the user.

D:Both VM and Bare Metal allow multiple database homes if configured properly.

Exadata's Unique Architecture:

Exadata Database Service is engineered specifically for Oracle Database workloads. The architecture leverages specialized storage servers that performdata-intensive operations at the storage level(such as filtering and aggregation), reducing the amount of data sent to the compute nodes.

TheRoCE network(RDMA over Converged Ethernet) provides high-bandwidth, low-latency connectivity between compute and storage nodes, significantly enhancing I/O performance. This architecture is optimized for bothOLTP and OLAP workloads, making Exadata a superior choice for performance-critical applications.

Why the other options are incorrect:

A:Exadata combines both virtualized and bare metal compute nodes.

C:Both Exadata and traditional cloud deployments can support Oracle RAC, but Exadata is optimized for it.

D:Exadata uses the same Oracle Database SQL parsing engine; the difference lies in the optimized hardware.

C. Utilizing OCI Database backups:

Integrated withOracle Cloud Infrastructure (OCI), providing consistent and complete backups.

Supports both theMySQL Database System and the HeatWave cluster, ensuring data integrity.

Automates backup scheduling and retention policies.

Facilitates easy restoration in case of data loss or corruption.

Why the other options are incorrect:

A. Manual copying:Prone to errors and lacks consistency.

B. Manual dumps to Object Storage:Labor-intensive and not automated.

D. MySQL replication:Suitable for high availability, but not a substitute for regular backups.

E. MySQL Enterprise Backup on nodes:Complex and not designed for HeatWave's distributed environment.

B. Querying data directly from object storage without data loading:

HeatWave Lakehouse extends MySQL HeatWave by allowing direct query execution on data stored in external object storage.

Supports formats such asCSV,Parquet, andAvro.

Eliminates the need for data import, making the process faster and more efficient for large datasets.

Enhances HeatWave's capability to act as aLakehouseby unifying data warehousing and data lake functionalities.

Why the other options are incorrect:

A. GUI for database management:Not related to analytical extension.

C. Disaster recovery replication:Not related to Lakehouse functionality.

D. Built-in ETL tool:Lakehouse focuses on query capability, not ETL.

E. Separate data warehouse:HeatWave Lakehouse queries data in-place, not creating a separate warehouse.

Managing Exadata Infrastructure:

OCI Console and APIs (B):The primary method for managing Exadata Infrastructure is through theOracle Cloud Infrastructure Consoleand associated APIs. This includes provisioning, scaling, patching, and monitoring the Exadata environment.

Oracle-Managed Infrastructure (E):Exadata Infrastructure management is fully handled by Oracle, which means customers do not have direct access to the underlying hardware. This managed approach ensureshigh availability and security.

Why the other options are incorrect:

A:Customers do not have root access to Exadata compute nodes to ensure security and system integrity.

C:Thedbcli utilityis designed for VM DB Systems, not Exadata Infrastructure management.

D:Exadata storage cells are managed by Oracle, and customers cannot directly modify storage configurations.

C. Using Oracle Data Guard for a switchover operation:

Aswitchoveris a planned role reversal between the primary and standby databases.

Zero data loss:Since both databases are synchronized, it minimizes downtime.

Ideal for planned maintenance:The primary database is switched to the standby, allowing maintenance on the original primary without downtime.

Data Guard Switchover:

sql

CopyEdit

ALTER DATABASE SWITCHOVER TO standby_db;

Why the other options are incorrect:

A. Full backup with RMAN:Backup does not ensure availability during maintenance.

B. In-place upgrade:Typically involves downtime.

D. Quarterly patch:Patching often requires database restarts, causing downtime.

E. Resizing block volume:Does not maintain availability if the database requires restarting.