合格させるOracle 1Z0-1093-23試験最速合格 [Q32-Q49]

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合格させるOracle 1Z0-1093-23試験最速合格

準備1Z0-1093-23問題解答で1Z0-1093-23試験問題集

質問 # 32
You define a maintenance window for your MySQL DB systems.
When the automatic maintenance process takes place, which two activities does the system perform while its status is set to UPDATING?

  • A. It patches the MySQL server itself along with any underlying hardware.
  • B. It patches the underlying operating system of the MySQL database.
  • C. It upgrades the associated compute instance to the latest Linux operating system version.
  • D. It analyzes, rebuilds, and optimizes MySQL database tables and indexes.

正解：A、B

解説：
* Maintenance Windows and MySQL: Maintenance windows in MySQL database systems (including those in cloud environments) are primarily dedicated to patching and updating the core database software and the operating system upon which it runs. This ensures security fixes, bug resolutions, and potential performance improvements.expand_more
* Excluded Activities:
* A. OS Upgrades: Upgrading to an entirely new Linux OS version is typically a more disruptive process and less likely to be an automated background maintenance task.
* B. Table Optimization: Table analysis, rebuilding, and optimization can be automated. However, these are often handled as separate database-level maintenance tasks, not necessarily tied to the system-wide maintenance window.
References:
* Cloud SQL for MySQL documentation on maintenance: (Find references for your specific MySQL environment - Google Cloud, AWS, Azure, etc.).
Example: https://cloud.google.com/sql/docs/mysql/maintenance
* General MySQL maintenance: Search for resources discussing routine maintenance tasks within MySQL. These will often distinguish between system-level updates (OS, DB software) and database-level optimizations.


質問 # 33
Which statement is FALSE about updating your Virtual Machine DB System database?

  • A. Updating the DB System also updates the operating system.
  • B. Updating the DB system updates the Grid Infrastructure for two-node RAC DB Systems with Automatic Storage Management (ASM) storage management software.
  • C. Updating the DB System does NOT update the operating system.
  • D. Ensuring/uOl has 15 GB of free space.

正解：C

解説：
Updating a DB system on a virtual machine updates the Oracle Database software and the Grid Infrastructure software, but not the operating system. The operating system can be updated separately using the Upgrade option in the Console or the API. Therefore, statement D is false and the rest are true. References:
* 3: Update a DB System - Oracle Help Center
* 4: Upgrade a DB System - Oracle Help Center


質問 # 34
Which two statements are true about using a Service Gateway? (Choose two.)

  • A. The Service Gateway with a public subnet can be used to access Object Storage.
  • B. The Service Gateway can connect to services in other regions outside of the VCN.
  • C. The Service Gateway can connect to services in the same region of its VCN.
  • D. The Service Gateway with a private subnet can be used to access Object Storage.
  • E. The Service Gateway can be used to connect to the Internet.

正解：C、D


質問 # 35
Which statement is FALSE related to loading a table into HeatWave?

  • A. Data is read from InnoDB using batched, multi-threaded reads.
  • B. Data is distributed among analytics nodes by slicing tables by vertically.
  • C. Data is converted into columnar format and sent over the network.
  • D. Data is partitioned by primary key unless data placement keys are defined.

正解：C


質問 # 36
Which tool can be used to monitor a storage server in Exadata Database Service?

  • A. OCI CLI
  • B. dbaascli
  • C. ocpucli
  • D. exacli

正解：D

解説：
The exacli tool is a command-line interface that can be used to monitor and manage the storage servers in Exadata Database Service. The exacli tool provides access to the cellcli command, which is used to manage and monitor individual Oracle Exadata storage cells1. The exacli tool can also perform other tasks, such as checking the status of the storage server grid, viewing the configuration and performance metrics of the storage servers, and applying patches and updates to the storage servers2.
The other options are not tools that can be used to monitor a storage server in Exadata Database Service. The dbaascli tool is a command-line interface that can be used to perform various administrative tasks on the database servers, such as creating and deleting databases, managing backups and restores, and applying patches and updates3. The OCI CLI tool is a command-line interface that can be used to interact with Oracle Cloud Infrastructure services, such as creating and managing resources, configuring network and security settings, and accessing the Console4. The ocpucli tool is not a valid tool name, but it may be confused with the opctli tool, which is a command-line interface that can be used to manage Oracle Private Cloud Appliance, a converged infrastructure system that is not related to Exadata Database Service5. References:
* exacli Command-Line Interface - Oracle Help Center
* Monitor Oracle Exadata Storage Infrastructure in OCI Database Management
* dbaascli Utility Reference - Oracle Help Center
* Command Line Interface (CLI) - Oracle Help Center
* Oracle Private Cloud Appliance Administrator's Guide


質問 # 37
In addition to Automatic backups of your Oracle database, you want to take On-Demand backups of the database on Exadata Database Service on Dedicated Infrastructure in the public cloud.
How can you do this?

  • A. Connect to Exadata Database Service as oracle user first and then take an On-Demand backup.
  • B. Use the Create Backup button in the backup section of the Database Details page to take an On-Demand backup.
  • C. On-Demand backups are not allowed on Exadata Database Service because they use Automatic backups.
  • D. Disable Automatic backup and then take an On-Demand backup.

正解：B


質問 # 38
Which is NOT an Oracle best practice for updating Virtual Machine DB System databases?

  • A. Ensure all servers and database instances are stopped before applying patch to your DB system to avoid data corruption.
  • B. Patch the DB System before updating a database for DB Systems with Grid Infrastructure/ASM storage management.
  • C. Run the grecheck operation before you apply any update.
  • D. Back up your databases before you apply any updates to your system.

正解：A

解説：
Oracle recommends that you do not stop any servers or database instances before applying a patch to your DB system. Stopping the servers or instances can cause the patching process to fail or take longer than expected.
Instead, you should run the precheck operation before you apply any update to verify that your DB system meets the patching prerequisites. You should also back up your databases before you apply any updates to your system, and patch the DB system before updating a database for DB systems with Grid Infrastructure/ASM storage management. Therefore, statement D is not an Oracle best practice and the rest are. References:
* 3: In-Place Upgrade for Database Cloud Service (DBCS) VM DB Systems
* 4: Update a DB System - Oracle Help Center


質問 # 39
You use the Oracle Cloud Infrastructure console to create a MySQL DB system. You give it the name "mysql" and set the administrator username to "mysql.sys." You give it a data storage size of 50 GB and set the host name to "mysql-host." You do not specify a Maintenance Window start day and time.
Which action causes an error?

  • A. Username "mysql.sys" is reserved.
  • B. Maintenance Window start time is required.
  • C. Host name should contain only letters.
  • D. Storage size is too small.

正解：A

解説：
The action that causes an error when creating a MySQL DB system is using the username "mysql.sys". This is because "mysql.sys" is a reserved username for the MySQL system schema, which contains views and stored procedures that implement server functionality1. You cannot create a user with the same name as the system schema, as it would cause conflicts and errors1. You should choose a different username for the administrator of the MySQL DB system, such as "mysql.admin" or "mysql.user".
The other actions do not cause errors, but they may have some implications:
* Storage size of 50 GB is not too small, but it may not be enough for your database workload and growth. You can choose a storage size from 50 GB to 16 TB when creating a MySQL DB system2. You can also scale up the storage size later if needed2.
* Host name of "mysql-host" is valid, but it should be unique within the subnet where the DB system is deployed2. You can use letters, numbers, and hyphens in the host name, but it must start and end with a letter or a number2.
* Maintenance Window start day and time is not required, but it is recommended to specify a preferred time for applying maintenance updates to the DB system2. If you do not specify a Maintenance Window, Oracle will assign a random day and time for the maintenance updates2.
References:
* MySQL :: MySQL 8.0 Reference Manual :: 5.6 The mysql System Schema
* MySQL :: MySQL Database Service User Guide :: 3.1 Creating a MySQL DB System


質問 # 40
Which two statements are true regarding MySQL Database Service HeatWave? (Choose two.)

  • A. The HeatWave data that is needed for analytic processing is stored in disk files.
  • B. HeatWave is an in-memory, query-processing engine designed for fast execution of analytic queries.
  • C. HeatWave uses machine learning to automate operations, increase DBA productivity, and reduce costs.
  • D. HeatWave uses periodic long-running ETL batch jobs to refresh data

正解：B、C


質問 # 41
Which two statements are true about Routing Tables? (Choose two.)

  • A. A VCN uses the Routing Table to send traffic out of the VCN.
  • B. The default Routing Table is shared by all the Subnets in the VCN.
  • C. A Routing Table controls ingress and egress rules, that specify the types of traffic allowed.
  • D. The Routing Table rules specify a destination CIDR Block and target.
  • E. You can delete the default Routing Table if it is not required.
  • F. Gateways added to your VCN do not require an entry in the Routing Table.

正解：A、D

解説：
A Routing Table is a set of rules that determine how traffic is routed within a VCN and to other networks. Each rule consists of a destination CIDR Block and a target, which can be a gateway, a private IP, or a service gateway1. A Routing Table controls only the egress (outbound) traffic from a subnet, not the ingress (inbound) traffic2. Therefore, statements B and F are true, and statements A, C, D, and E are false.
References: 1: Oracle Base Database Services 2023 Professional, Section 3.3.2: Routing Tables 2: Base Database Service, Section 2.2.3: Routing Tables


質問 # 42
You use the Oracle Cloud Infrastructure console to create a MySQL DB system. You give it the name "mysql" and set the administrator username to "mysql.sys." You give it a data storage size of 50 GB and set the host name to "mysql-host." You do not specify a Maintenance Window start day and time.
Which action causes an error?

  • A. Username "mysql.sys" is reserved.
  • B. Maintenance Window start time is required.
  • C. Host name should contain only letters.
  • D. Storage size is too small.

正解：A


質問 # 43
Which characteristic is NOT a factor that impacts the capacity units for provisioning a NoSQL Database Cloud Service table?

  • A. Record size
  • B. Data model
  • C. Query pattern
  • D. Durability level

正解：B


質問 # 44
Which method must you use to patch databases on Exadata Database Service with the least amount of downtime?

  • A. Conduct in place patching of the database Home.
  • B. Move the database to a new Home with the desired patch level.
  • C. Create a Data Guard standby and execute standby first patching.
  • D. Leverage Opatch to execute patching the database Home.
  • E. Leverage Patchmgr to execute patching the database Home.

正解：B


質問 # 45
Which statement is true about scaling storage for a Virtual Machine DB System?

  • A. You can independently scale the storage used by the VM DB System but the Available Data storage size cannot be decreased, whereas the Recovery Area storage size can be decreased.
  • B. You must concurrently scale up or down the storage used by the VM DB System for the Available Data storage size and the Recovery Area storage size.
  • C. You can independently scale the storage used by the VM DB System but the Available Data storage size and Recovery Area storage size cannot be decreased.
    C You must concurrently scale up the storage used by the VM DB System for the Available Data storage size and the Recovery Area storage size

正解：C

解説：
You can independently scale the storage used by the VM DB System but the Available Data storage size and Recovery Area storage size cannot be decreased. This is because the VM DB System uses block volumes to store the database data files and the recovery area files, and the block volumes cannot be downsized1. However, you can increase the storage size of the block volumes at any time, either individually or together, to accommodate the growth of your database1. You can also scale the compute resources of the VM DB System independently of the storage resources, by adding or removing CPU cores or changing the shape of the VM DB System1. Scaling the storage or compute resources of the VM DB System does not affect the availability of the database, as the scaling operations are performed online1. References:
* 1: Scaling a Virtual Machine DB System - Oracle Help Center
* Independent Scaling: Oracle VM DB Systems allow you to scale the Available Data storage (the main storage for your database) and the Recovery Area storage (used for backups, Flashback logs, etc.) separately.expand_more This provides flexibility.
* No Decreasing Storage: Once provisioned or scaled up, neither the Available Data storage nor the Recovery Area storage can be scaled pen_spark down.exclamation This is likely to protect data integrity.


質問 # 46
Which characteristic is NOT a factor that impacts the capacity units for provisioning a NoSQL Database Cloud Service table?

  • A. Query pattern
  • B. Record size
  • C. Data model
  • D. Durability level

正解：A

解説：
The characteristic that is NOT a factor that impacts the capacity units for provisioning a NoSQL Database Cloud Service table is the query pattern. The query pattern refers to the frequency and complexity of the queries that are executed on the table. The query pattern does not affect the capacity units, which are based on the write and read throughput and the storage capacity of the table1.
The other options are factors that impact the capacity units for provisioning a NoSQL Database Cloud Service table because:
* A. Record size: The record size affects the write and read units, which are defined as the throughput of up to 1 KB of data per second for a write or read operation. If the record size is larger than 1 KB, then more write or read units are required to achieve the same throughput1.
* B. Durability level: The durability level affects the read units, which are defined as the throughput of up to 1 KB of data per second for an eventual consistent read operation. If the durability level is set to absolute consistent, which guarantees that the data returned is the most recent, then twice as many read units are required to achieve the same throughput1.
* C. Data model: The data model affects the storage capacity, which is defined as the amount of storage space used by the table. The data model determines the number and type of fields in each record, which in turn affects the storage size of each record. The more fields and complex data types in the record, the more storage capacity is required1.
References: 1: Oracle NoSQL Database Cloud Service Capacity Planning


質問 # 47
What three capabilities does the database fleet summary provide? (Choose three.)

  • A. Compare database performance metrics overtime.
  • B. View database log entries.
  • C. Execute a DDL command on the databases.
  • D. Migrate databases to OCI.
  • E. View the status of the databases.
  • F. View the current database resource usage.

正解：A、E、F


質問 # 48
Which statement is true about MySQL Database Service?

  • A. It is a fully managed Oracle Cloud Infrastructure (QCI) native service.
  • B. Its users are responsible for database and operating system patching tasks.
  • C. It is a public cloud service built on MySQL Community Edition.
  • D. It supports MySQL Enterprise Edition version 5.7 with InnoDB Storage Engine.

正解：A

解説：
The statement that is true about MySQL Database Service is that it is a fully managed Oracle Cloud Infrastructure (OCI) native service1. This means that MySQL Database Service is developed, managed, and supported by the MySQL team in Oracle, and that Oracle automates tasks such as backup and recovery, and database and operating system patching1. You are responsible solely for managing your data, schema designs, and access policies1.
The statements that are false about MySQL Database Service are:
* It is a public cloud service built on MySQL Community Edition. This is false, because MySQL Database Service is built on MySQL Enterprise Edition, which includes advanced features, tools, and support that are not available in MySQL Community Edition2. MySQL Database Service also includes the ability to use HeatWave, an integrated, high-performance, in-memory query accelerator that is not part of MySQL Community Edition3.
* Its users are responsible for database and operating system patching tasks. This is false, because Oracle handles the database and operating system patching tasks for MySQL Database Service, as part of the fully managed service offering1. You do not need to worry about applying patches or updates to your MySQL Database Service instances, as Oracle will do it for you automatically and transparently1.
* It supports MySQL Enterprise Edition version 5.7 with InnoDB Storage Engine. This is false, because MySQL Database Service supports MySQL Enterprise Edition version 8.0 with InnoDB Storage Engine2. MySQL 8.0 is the latest and most advanced version of MySQL, which offers many improvements and enhancements over MySQL 5.72. MySQL Database Service does not support MySQL 5.7 or any other previous versions of MySQL2.
References:
* Overview of MySQL Database Service
* MySQL Database Service Versions
* Overview of MySQL HeatWave Service


質問 # 49
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