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1z0-1093-25試験問題 & 1z0-1093-25真実試験
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Oracle 1z0-1093-25 認定試験の出題範囲:
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Oracle 1z0-1093-25真実試験 & 1z0-1093-25試験関連赤本
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Oracle Cloud Database Services 2025 Professional 認定 1z0-1093-25 試験問題 (Q89-Q94):
質問 # 89
In a key-value NoSQL database, what is the primary mechanism for accessing data?
- A. Traversing relationships between nodes to find related data.
- B. Using SQL queries to filter and retrieve data based on complex criteria.
- C. Using a unique key to retrieve the associated value directly.
- D. Scanning all documents in the database to find matching data.
正解:C
解説:
Data Access in Key-Value Stores:
A key-value database works by storing data askey-value pairs. The primary access methodinvolves:
* Providing aunique keyto quickly retrieve the associated value.
* This model is highly efficient forsimple lookupsand data retrieval where thekey is known.
* Due to itssimplicity and speed, it is commonly used for caching and session management.
Why the other options are incorrect:
* A:SQL queries are used in relational databases, not key-value stores.
* C:Traversing nodes is typical ingraph databases.
* D:Scanning all documents is inefficient and not the primary method in key-value stores.
質問 # 90
Which two actions can be performed using the Automatic Database Diagnostic Monitor (ADDM) within Database Management to diagnose cloud database performance?
- A. Automatically create indexes to improve query performance.
- B. Identify root causes of performance bottlenecks, such as excessive I/O or CPU contention.
- C. Generate recommendations for SQL plan baselines.
- D. Automatically apply all ADDM recommendations to the database.
正解:B、C
解説:
A: Generate recommendations for SQL plan baselines:
* ADDM analyzes historical data andSQL execution plans, suggesting baseline adjustments to optimize performance.
* Recommendations may includeusing an existing baselineor creating a new one.
C: Identify performance bottlenecks:
* ADDM pinpoints issues related to:
* I/O contention
* CPU utilization
* Memory bottlenecks
* Locking issues
* Helps DBAs understand which database components are causing slowdowns.
Why the other options are incorrect:
* B. Automatically applying recommendations:ADDM only suggests actions; DBAs must manually review and implement them.
* D. Creating indexes:ADDM does not create indexes automatically; it may suggest them, but implementation requires DBA action.
質問 # 91
You are managing an Exadata Database Service (ExaDB) and need to perform a full backup of the database to Oracle Cloud Infrastructure Object Storage using the bkup_api utility. The backup must include all datafiles and control files. Which bkup_api command will achieve this?
- A. bkup_api bkup_start --datafiles --controlfile --dbname=dbname
- B. bkup_api bkup_start --all --dbname=dbname
- C. bkup_api bkup_start --dbname=dbname
- D. bkup_api bkup_start --full --dbname=dbname
正解:D
解説:
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.
質問 # 92
In a column-family NoSQL database, what is the purpose of a "super column"?
- A. To define the primary key for the entire database.
- B. To group related columns together, providing a level of hierarchy within the column family.
- C. To represent a single value associated with a row key.
- D. To store large binary objects (BLOBs).
正解:B
解説:
Super Columns in Column-Family Databases:
Asuper columnis a higher-level construct used incolumn-family NoSQL databases(like Apache Cassandra).
It groups related columns together under a single name, forming atwo-level hierarchywithin a column family.
* This structure is useful when storing data that naturally fits anested or hierarchical format.
* For example, a user profile might contain super columns like "Address" (with sub-columns like
"Street", "City", "ZIP") and "Contacts" (with sub-columns like "Phone", "Email").
Why the other options are incorrect:
* A:A regular column represents a single value associated with a row key.
* C:Primary keys are defined at the row level, not using super columns.
* D:While BLOBs can be stored, the primary role of a super column is togroup related columns, not store binary data.
質問 # 93
Within the context of Exadata Database Service, what does scaling out primarily refer to?
- A. Upgrading the version of the Oracle Database software.
- B. Increasing the CPU core count of a single database server VM.
- C. Expanding the amount of RAM available to a single database instance.
- D. Adding additional database server VMs and storage servers to the Exadata system.
正解:D
解説:
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 to distribute 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.
質問 # 94
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