NEW 2024 Certification Sample Questions 1z0-915-1 Dumps & Practice Exam
1z0-915-1 Deluxe Study Guide with Online Test Engine
Oracle 1z0-915-1 Exam Syllabus Topics:
| Topic | Details |
|---|---|
| Topic 1 |
|
| Topic 2 |
|
| Topic 3 |
|
| Topic 4 |
|
| Topic 5 |
|
| Topic 6 |
|
| Topic 7 |
|
| Topic 8 |
|
NEW QUESTION # 30
Which is true about automatic DB system version upgrades?
- A. The DB system is upgraded to the most recent release.
- B. The DB system is upgraded to the next release in sequence.
- C. The DB system is never upgraded automatically.
- D. You must specify the next version to be used before the upgrade.
Answer: B
Explanation:
Automatic DB system version upgrades in OCI are performed to the next release in sequence. This means that the system is upgraded to the next available version rather than skipping to the most recent release, ensuring a stable and tested upgrade path.
NEW QUESTION # 31
You want to migrate an on-premises MySQL database to MySQL HeatWave by exporting the MySQL database with MySQL Shell util.dumpInstance.
What is the purpose of the ocimds: true option?
- A. It stores the exported files in OCI Object Storage.
- B. It enables all MySQL HeatWave compatibility options.
- C. It returns an error if the database has any incompatibilities with MySQL HeatWave.
- D. It launches a new DB system and imports the data concurrently with the export operation.
Answer: A
Explanation:
The purpose of theocimds: trueoption in theutil.dumpInstancecommand is to:
D:It stores the exported files in OCI Object Storage: This option ensures that the exported database files are stored directly in Oracle Cloud Infrastructure Object Storage.
NEW QUESTION # 32
How can you determine the uptime of a DB system?
- A. By querying performance_schema.global_status from a connected MySQL client
- B. By checking the DB system details in the OCI Web console
- C. By executing mysql db-system get --db-system-id with OCI CLI
- D. By using the Audit section in Logging information in the OCI Web console
Answer: B
Explanation:
You can determine the uptime of a DB system bychecking the DB system details in the OCI Web console(Answer B). The console provides information on the system status, including the uptime since the last start.
Steps:
* Log in to the OCI Web console.
* Navigate to the MySQL DB system.
* View the details page of the DB system, where the uptime information is displayed.
References:
* OCI Console Documentation
* Monitoring DB System Uptime
NEW QUESTION # 33
Which sequence of steps must you perform to change the configuration of a high-availability DB system?
- A. Edit the DB system and change the configuration.
- B. Edit and change the configuration of all secondary instances, switch over to a secondary instance, andedit and change the configuration of the former primary instance.
- C. Stop the DB system, edit the DB system, change the configuration, and start the DB system.
- D. Disable high availability, edit the DB system, change the configuration, and enable high availability.
Answer: C
Explanation:
To change the configuration of a high-availability DB system, you must follow these steps:
* Stop the DB system: This ensures that the system is in a consistent state and that no transactions are being processed during the configuration change.
* Edit the DB system: Make the necessary changes to the configuration.
* Change the configuration: Apply the configuration changes.
* Start the DB system: Restart the system to apply the new configuration settings.
NEW QUESTION # 34
Which is true about dynamic variables in MySQL HeatWave configurations?
- A. Dynamic variables in a custom configuration can be changed without copying the configuration to a new configuration.
- B. All user variables are dynamic.
- C. Initialization variables are not dynamic.
- D. Changes in dynamic variables require a server restart.
Answer: A
Explanation:
In MySQL HeatWave configurations, dynamic variables can be changed without requiring the configuration to be copied to a new configuration. This allows for more flexible and immediate adjustments to system settings without the need for a server restart or creating a new configuration instance.
NEW QUESTION # 35
Which three must be provided when creating a channel? (Choose three.)
- A. Source connection SSL mode
- B. Channel name
- C. Replication delay
- D. Source connection password
- E. Target DB system
Answer: A,B,D
Explanation:
When creating a channel for replication in MySQL, the following must be provided:
* Channel name(Answer A): The unique identifier for the replication channel.
* Source connection SSL mode(Answer B): Specifies the SSL mode for the connection to the source server.
* Source connection password(Answer D): The password for the source server connection.
Steps:
* UseCHANGE MASTER TOcommand to set up the replication channel.
* Provide the channel name, SSL mode, and connection password as part of the configuration.
References:
* MySQL Replication Documentation
* Setting Up Replication Channels
NEW QUESTION # 36
You want to replicate data from an on-premises MySQL server to a MySQL DB system. The on-premises MySQL server runs in your corporate network. The MySQL server accepts incoming connections from the Internet on a public IP endpoint.
The DB system runs in Oracle Cloud Infrastructure. The DB system endpoint is connected to a privatesubnet of a VCN.
Which network configuration is required?
- A. Create an Internet gateway in the VCN and configure the DB system subnet to route Internet-bound traffic to the Internet gateway.
- B. Create a service gateway in the VCN and configure the DB system subnet to route Internet-bound traffic to the service gateway.
- C. Create a NAT gateway in the VCN and configure the DB system subnet to route Internet-bound traffic to the NAT gateway.
- D. Configure an OCI network load balancer to accept incoming connections on a public IP and route to the DB system private IP address.
Answer: C
Explanation:
To replicate data from an on-premises MySQL server to a MySQL DB system running in Oracle Cloud Infrastructure (OCI), where the DB system is connected to a private subnet of a Virtual Cloud Network (VCN), you need to enable the DB system to communicate with the Internet securely. The correct configuration is tocreate a NAT gateway in the VCN and configure the DB system subnet to route Internet-bound traffic to the NAT gateway(Answer D).
* NAT Gateway: A Network Address Translation (NAT) gateway enables instances in a private subnet to initiate outbound traffic to the Internet, but it prevents the Internet from initiating connections to those instances.
* Route Table Configuration: You need to update the route table for the private subnet to direct traffic destined for the Internet to the NAT gateway.
Steps:
* Create a NAT gateway in the OCI Console.
* Update the route table associated with the private subnet to include a route rule that directs all Internet-bound traffic (0.0.0.0/0) to the NAT gateway.
References:
* OCI NAT Gateway Documentation
* Configuring Routing for Private Subnets
NEW QUESTION # 37
You have a MySQL DB system with five active read replicas. The workload consists of 5% writes and 95% reads.
Which connection method provides the fastest query response time?
- A. Connect to the source DB system to perform read-only operations.
- B. Connect to a specific read replica to perform read-only operations.
- C. Connect to the read replica load balancer to perform read-only operations.
- D. Connect to the read replica load balancer to perform read/write operations.
Answer: C
Explanation:
For a MySQL DB system with five active read replicas and a workload consisting mostly of reads, the fastest query response time is achieved by:
C:Connect to the read replica load balancer to perform read-only operations: The read replica load balancer distributes the read workload across all replicas, optimizing performance and response time.
NEW QUESTION # 38
You want to deploy a high-availability MySQL DB system in a region with multiple availability domains.
Which two types of subnet provide maximum redundancy? (Choose two.)
- A. A private AD-specific subnet
- B. A public AD-specific subnet
- C. A public regional subnet
- D. A private regional subnet
Answer: C,D
Explanation:
To deploy a high-availability MySQL DB system in a region with multiple availability domains, the following types of subnets provide maximum redundancy:
* A private regional subnet(Answer B): This type of subnet spans all availability domains in the region, ensuring high availability and fault tolerance.
* A public regional subnet(Answer C): Similar to the private regional subnet, a public regional subnet spans all availability domains, providing maximum redundancy and accessibility.
References:
* OCI Networking Documentation
* MySQL High Availability Documentation
NEW QUESTION # 39
You want to change the configuration of an active stand-alone DB system. The DB system is configured as the target of a channel, and the channel is currently active.
Which sequence of steps must you perform?
- A. Stop the channel, edit the DB system, change the configuration, and start the channel.
- B. Edit the DB system and change the configuration.
- C. Stop the DB system, edit the DB system, change the configuration, and start the DB system.
- D. Delete the channel, edit the DB system, change the configuration, and re-create the channel.
Answer: A
Explanation:
To change the configuration of an active stand-alone DB system that is configured as the target of a channel, and the channel is currently active, you must:
D:Stop the channel, edit the DB system, change the configuration, and start the channel: This sequence ensures that no data inconsistency or replication issues occur while the configuration changes are being applied.
NEW QUESTION # 40
Which table option defines a Lakehouse external table based on a CSV file?
- A. ENGINE=lakehouse SECONDARY_ENGINE=csv ENGINE_ATTRIBUTE='{"file": [{"region":
"us-ashburn-1", "namespace": "mytenant", "bucket": "bucket01", "name": "airport.csv"}] }' - B. ENGINE=csv SECONDARY_ENGINE=lakehouse ENGINE_ATTRIBUTE='{"file": [{"region":
"us-ashburn-1", "namespace": "mytenant", "bucket": "bucket01", "name": "airport.csv"}] }' - C. ENGINE=lakehouse SECONDARY_ENGINE=rapid ENGINE_ATTRIBUTE='{"file": [{"region":
"us-ashburn-1", "namespace": "mytenant", "bucket": "bucket01", "name": "airport.csv"}] }' - D. ENGINE=csv SECONDARY_ENGINE=rapid ENGINE_ATTRIBUTE='{"file": [{"region":
"us-ashburn-1", "namespace": "mytenant", "bucket": "bucket01", "name": "airport.csv"}] }'
Answer: B
Explanation:
B:ENGINE=csv SECONDARY_ENGINE=lakehouse ENGINE_ATTRIBUTE='{"file": [{"region":
"us-ashburn-1", "namespace": "mytenant", "bucket": "bucket01", "name": "airport.csv"}] }': This table option defines a Lakehouse external table based on a CSV file. It specifies thecsvengine for the table and uses thelakehouseas the secondary engine, along with the file's location details in OCI Object Storage.
NEW QUESTION # 41
The first query has an estimated cost of 100,000,000 and is offloaded to a HeatWave cluster for execution:
SELECT flightno, departure, country FROM flight JOIN airport_geo ON 'from'=airport_id; The second query has an estimated cost of 10,000 and is NOT offloaded to the Heatwave cluster for execution:
SELECT DISTINCT country FROM airport_geo ORDER BY country;
Which two methods can offload the second query to the Heatwave cluster for execution? (Choose two.)
- A. CALL sys.heatwave_advisor(JSON_OBJECT("auto_enc", JSON_OBJECT("mode", "recommend")));
- B. SET use_secondary_engine=FORCED;
- C. SET optimizer_trace="enabled=on";
- D. CALL sys.heatwave_load('["airport_geo"]');
- E. SET secondary_engine_cost_threshold=1000;
Answer: B,E
Explanation:
To offload the second query to the HeatWave cluster for execution, you can use the following methods:
* SET use_secondary_engine=FORCED(Answer A): This forces the use of the HeatWave secondary engine for query execution, regardless of the estimated cost.
* SET secondary_engine_cost_threshold=1000(Answer B): This lowers the cost threshold for queries to be offloaded to the HeatWave cluster, allowing queries with lower estimated costs to be offloaded.
Steps:
* Before running the second query, executeSET use_secondary_engine=FORCED;to force the offloading of queries to HeatWave.
* Alternatively, executeSET secondary_engine_cost_threshold=1000;to adjust the cost threshold, making the second query eligible for offloading.
NEW QUESTION # 42
You run this command to connect successfully to a DB system:
mysqlsh [email protected] --auth-method=authentication_oci_client
Why does the command NOT require a password?
- A. The correct password is saved in the local MySQL Shell secret store.
- B. The operating system user credential is used to authenticate with the DB system.
- C. The credential is stored in an OCI vault secret.
- D. The correct API key-pair is specified in the -/. oci. config file.
Answer: D
Explanation:
The commandmysqlsh [email protected] --auth-method=authentication_oci_clientdoes not require a password because it uses the OCI (Oracle Cloud Infrastructure) client authentication method. This method relies on the correct API key-pair specified in the~/.oci/configfile. This file contains the necessary credentials (user OCID, tenancy OCID, API keys, etc.) to authenticate with the OCI environment without needing a password for each connection.
NEW QUESTION # 43
You want to import data into a DB system with MySQL Shell util.loadDump().
Which option can speed up the load?
- A. skipBinlog: true
- B. showMetadata: false
- C. deferTableIndexes: all
- D. updateGtidSet: off
Answer: C
Explanation:
To speed up the data load into a DB system usingMySQL Shell util.loadDump(), you can use the deferTableIndexes: alloption (Answer D). This option defers the creation of indexes until after the data has been loaded, which can significantly improve the speed of the loading process.
Steps:
* Export your data using MySQL Shell dump utility.
* Useutil.loadDump()to import the data and specify thedeferTableIndexes: alloption.
* The data is loaded without building indexes initially, reducing the time required for the import.
* After the data load is complete, indexes are created in a batch process, which is more efficient than creating them during the data load.
References:
* MySQL Shell Dump & Load Documentation
NEW QUESTION # 44
The following statements are executed successfully:
Which two are true? (Choose two.)
- A. The data placement key of the airport table is airport_id.
- B. The airport.tbl file is in CSV format.
- C. The fields in the airport.tbl file are delimited by comma.
- D. The data of the airport table is loaded into the MySQL DB system.
- E. Every row in the airport table has a unique airport_id value.
Answer: A,D
Explanation:
Based on the provided SQL statements, the following two are true:
* The data placement key of the airport table is airport_id(Answer A): The primary keyairport_idis used as the data placement key in theairporttable. This means that the data in the table is organized based on theairport_idvalues.
* The data of the airport table is loaded into the MySQL DB system(Answer D): TheALTER TABLE airport SECONDARY_LOAD;statement successfully loads the data from the specified object storage file into the MySQL DB system.
References:
* MySQL HeatWave Documentation
* MySQL Engine Attributes
NEW QUESTION # 45
You want to enable high availability of a stand-alone DB system. Which two conditions are required? (Choose two.)
- A. The DB system must be active.
- B. The DB system crash recovery must be enabled.
- C. The DB system automatic backup must be enabled.
- D. The DB system delete protection must be enabled.
- E. The DB system point-in-time recovery must be enabled.
Answer: A,C
Explanation:
To enable high availability for a stand-alone DB system, the following conditions are required:
* The DB system must be active(Answer D): The DB system needs to be in an active state to enable high availability features.
* The DB system automatic backup must be enabled(Answer E): Automatic backups must be enabled to ensure data protection and facilitate failover operations.
Steps:
* Ensure the DB system is running and operational.
* Enable automatic backups through the OCI Console or API.
References:
* MySQL High Availability Documentation
* Automatic Backups Documentation
NEW QUESTION # 46
You want to restore a stand-alone DB system to a high-availability DB system with a point-in-time recovery.
Which three are required? (Choose three.)
- A. Point-in-time recovery must be enabled before the point in time to which you want to restore.
- B. A manual backup taken before the selected point in time must be available.
- C. Every user table must have a primary key.
- D. An automatic backup taken before the selected point in time must be available.
- E. The stand-alone DB system must remain active during the restore.
Answer: A,B,D
NEW QUESTION # 47
You create a MySQL DB system with default port numbers, and attach it to a subnet.
Which configuration is required on the subnet to enable client applications to connect to the DB system?
- A. Create an ingress rule that allows stateful connections on port 3306 and 33060.
- B. Create an egress rule that allows stateless connections on port 3306 and 33060.
- C. Create an ingress rule that allows stateless connections on port 3306 and 33060.
- D. Create an egress rule that allows stateful connections on port 3306 and 33060.
Answer: A
Explanation:
To enable client applications to connect to a MySQL DB system that uses default port numbers and is attached to a subnet, you need tocreate an ingress rule that allows stateful connections on port 3306 and 33060(Answer C).
* Ingress Rule: An ingress rule specifies the types of inbound connections that are allowed to a resource within a subnet.
* Stateful Connections: Stateful connections keep track of the state of network connections passing through them, allowing return traffic to pass automatically.
Steps:
* Navigate to the Virtual Cloud Network (VCN) in the OCI Console.
* Open the subnet to which the MySQL DB system is attached.
* Add an ingress rule to the subnet's security list to allow traffic on port 3306 (MySQL) and 33060 (MySQL X Protocol).
* Ensure the rule is stateful to maintain the connection state.
References:
* OCI Networking Documentation
* MySQL X Protocol Documentation
NEW QUESTION # 48
What must be enabled for using the point-in-time recovery feature in a DB system?
- A. HeatWave cluster
- B. High availability
- C. Delete protection
- D. Automatic backups
Answer: D
Explanation:
To use the point-in-time recovery feature in a DB system,automatic backupsmust be enabled (Answer B).
* Point-in-Time Recovery: This feature allows you to restore your database to a specific point in time, which is crucial for recovering from accidental data loss or corruption.
* Automatic Backups: These provide the necessary backup data that can be used to restore the database to the desired point in time.
References:
* OCI MySQL Database Service Point-in-Time Recovery
* Automatic Backups Documentation
NEW QUESTION # 49
You want to create a custom configuration for the MySQL DB system in OCI Console. Which three can you set? (Choose three.)
- A. Compartment
- B. Subnet
- C. Description
- D. Shape
- E. VCN
Answer: A,D,E
Explanation:
When creating a custom configuration for the MySQL DB system in OCI Console, you can set the following:
A:Shape: This defines the compute resources (CPU, memory) allocated to the DB system. B.VCN (Virtual Cloud Network): This defines the network in which your DB system will be placed. E.Compartment: This is an OCI resource management feature that allows you to organize and isolate your cloud resources.
NEW QUESTION # 50
You want to migrate an on-premises MySQL database to a MySQL DB system on OCI.
Which method provides the least amount of application down time when switching to the DB system?
- A. Run MySQL Shell on an OCI compute instance to export and import the data for faster migration.
- B. Use inbound replication to synchronize the MySQL database transactions to the DB system.
- C. Store the exported data in object storage to speed up the export and import.
- D. Use the largest DB system shape to speed up the import.
Answer: B
Explanation:
To migrate an on-premises MySQL database to a MySQL DB system on OCI with the least amount of application downtime,use inbound replication to synchronize the MySQL database transactions to the DB system(Answer C).
* Inbound Replication: This method involves setting up replication from your on-premises MySQL database to the MySQL DB system in OCI. This ensures that all changes and transactions are continuously replicated, keeping the DB system up to date with minimal downtime.
* Steps to Implement:
* Set up the MySQL DB system in OCI.
* Configure the on-premises MySQL database as the master and the OCI DB system as the slave.
* Start the replication process to keep the DB system synchronized with the on-premises database.
* When ready, switch the application to the DB system with minimal downtime as the data is already synchronized.
References:
* MySQL Replication Documentation
* OCI MySQL Database Service Replication
NEW QUESTION # 51
Which is true about exporting data to Object Storage with MySQL Shell util.dumpInstance?
- A. You must specify ociParManifest: true.
- B. You must specify ocimds: true.
- C. You must have a valid OCI CLI configuration.
- D. You must provide an OCI username and password to gain write access to Object Storage.
Answer: A
Explanation:
When exporting data to Object Storage withMySQL Shell util.dumpInstance,you must specify ociParManifest: true(Answer B). This option creates a pre-authenticated request (PAR) manifest file, which allows for secure access and upload to Object Storage without requiring direct credentials.
References:
* MySQL Shell Documentation
* OCI Object Storage Documentation
NEW QUESTION # 52
......
1z0-915-1 dumps review - Professional Quiz Study Materials: https://www.practicedump.com/1z0-915-1_actualtests.html
1z0-915-1 Test Prep Training Practice Exam Questions Practice Tests: https://drive.google.com/open?id=19FxsxXRBvs7NufqhTEFIINpMyEtXJgsy