[Dec 09, 2024] Genuine 1z0-915-1 Exam Dumps New 2024 Oracle Pratice Exam
New 2024 Realistic 1z0-915-1 Dumps Test Engine Exam Questions in here
Oracle 1z0-915-1 Exam Syllabus Topics:
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NEW QUESTION # 20
Which two are true about creating a Bastion service to connect to a MySQL DB system? (Choose two.)
- A. The Bastion CIDR block allowlist must include the IP address of the DB system.
- B. The Bastion service must have a public IP address.
- C. The Bastion CIDR block allowlist must include the IP address of all valid client machines.
- D. TheBastion subnet must have an ingress rule to allow stateful connections on the MvSQL DB system port number.
- E. The Bastion service must be in the same VCN as the DB system.
Answer: C,D
Explanation:
When creating a Bastion service to connect to a MySQL DB system, the following are true:
* The Bastion CIDR block allowlist must include the IP address of all valid client machines(Answer C):
This ensures that only the IP addresses specified in the allowlist can access the Bastion service, enhancing security by restricting access to known clients.
* The Bastion subnet must have an ingress rule to allow stateful connections on the MySQL DB system port number(Answer E): This allows the Bastion service to communicate with the MySQL DB system by permitting traffic through the necessary ports.
References:
* OCI Bastion Service Documentation
* Setting Up Bastion with MySQL DB System
NEW QUESTION # 21
You have obtained a new tenancy on Oracle Cloud Infrastructure. You first create a VCN by using the VCN Wizard, and then create a MySQL DB system. You want to create a Connection in Database tools to use the SQL Worksheet feature.
Which three steps are required? (Choose three.)
- A. Create an encryption key.
- B. Import an X.509 certificate into the OCI vault.
- C. Create an OCI vault.
- D. Create an OCI password.
- E. Create an OCI secret.
Answer: B,D,E
Explanation:
To create a connection in Database Tools to use the SQL Worksheet feature, the following steps are required:
* Create an OCI password(Answer A): This password is necessary for authentication when connecting to the MySQL DB system.
* Create an OCI secret(Answer D): Secrets are used to store sensitive information like passwords securely. The secret will contain the database credentials.
* Import an X.509 certificate into the OCI vault(Answer E): This certificate is required for secure connections to the database, ensuring encrypted communication.
References:
* OCI Database Tools Documentation
* Using OCI Secrets
* X.509 Certificates Documentation
NEW QUESTION # 22
Which feature do you use to copy transactions from an on-premises MySQL instance to a DB system?
- A. Outbound replication
- B. Read replica
- C. HeatWave cluster
- D. Inbound replication
Answer: D
Explanation:
To copy transactions from an on-premises MySQL instance to a DB system, you useinbound replication(Answer B).
* Inbound Replication: This feature allows the MySQL DB system to receive and apply changes (transactions) from an external MySQL instance.
* Replication Configuration: You need to set up replication between the on-premises MySQL instance and the MySQL DB system by configuring the master (on-premises) and the slave (DB system) appropriately.
References:
* MySQL Replication Documentation
* OCI MySQL Database Service Documentation
NEW QUESTION # 23
Which table option defines a Lakehouse external table based on a CSV file?
- A. ENGINE=csv SECONDARY_ENGINE=rapid ENGINE_ATTRIBUTE='{"file": [{"region":
"us-ashburn-1", "namespace": "mytenant", "bucket": "bucket01", "name": "airport.csv"}] }' - B. ENGINE=lakehouse SECONDARY_ENGINE=csv ENGINE_ATTRIBUTE='{"file": [{"region":
"us-ashburn-1", "namespace": "mytenant", "bucket": "bucket01", "name": "airport.csv"}] }' - C. ENGINE=csv SECONDARY_ENGINE=lakehouse ENGINE_ATTRIBUTE='{"file": [{"region":
"us-ashburn-1", "namespace": "mytenant", "bucket": "bucket01", "name": "airport.csv"}] }' - D. ENGINE=lakehouse SECONDARY_ENGINE=rapid ENGINE_ATTRIBUTE='{"file": [{"region":
"us-ashburn-1", "namespace": "mytenant", "bucket": "bucket01", "name": "airport.csv"}] }'
Answer: C
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 # 24
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. Use inbound replication to synchronize the MySQL database transactions to the DB system.
- B. Store the exported data in object storage to speed up the export and import.
- C. Run MySQL Shell on an OCI compute instance to export and import the data for faster migration.
- D. Use the largest DB system shape to speed up the import.
Answer: A
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 # 25
Why would you select "Source cannot use GTID auto-positioning" when creating a channel?
- A. Some tables have no primary key
- B. The source gtid mode is OFF.
- C. The target DB system is a high-availability DB system.
- D. The binary log offset is unknown.
Answer: B
Explanation:
When creating a replication channel and selecting "Source cannot use GTID auto-positioning", it typically indicates that the source's GTID mode is off. GTID (Global Transaction Identifier) auto-positioning allows for automated recovery and positioning of transactions in replication, but it requires that GTID mode be enabled on the source database.
NEW QUESTION # 26
Which two are true about read replica load balancer? (Choose two.)
- A. It has the same endpoint as the DB system.
- B. It is created when the DB system is first created.
- C. User accounts containing a client host name cannot connect to the read replica load balancer.
- D. It distributes connections among the source DB system and all read replicas.
- E. It distributes connections among read replicas.
Answer: D,E
Explanation:
The following are true about the read replica load balancer:
* It distributes connections among the source DB system and all read replicas(Answer B): The load balancer distributes incoming read traffic across all read replicas and the source DB system to balance the load and improve performance.
* It distributes connections among read replicas(Answer E): The load balancer ensures that read traffic is evenly distributed among all available read replicas, providing high availability and scalability for read operations.
References:
* OCI MySQL Database Service Read Replicas Documentation
NEW QUESTION # 27
Which is true about changing the storage size of a DB system?
- A. You cannot decrease the DB system's storage size.
- B. You must increase the DB system's storage size in multiples of 100 GB.
- C. You must stop the DB system before changing its storage size.
- D. The DB system shuts down during the resize operation.
Answer: A
Explanation:
When changing the storage size of a DB system,you cannot decrease the DB system's storage size(Answer B).
This restriction ensures data integrity and prevents potential data loss that could occur if the storage size were reduced.
* You can only increase the storage size of the DB system.
* The storage increase is done online without shutting down the DB system, allowing for uninterrupted
* operations.
References:
* OCI MySQL DB System Scaling Documentation
NEW QUESTION # 28
Which three must be provided when creating a channel? (Choose three.)
- A. Replication delay
- B. Channel name
- C. Target DB system
- D. Source connection SSL mode
- E. Source connection password
Answer: B,D,E
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 # 29
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. Initialization variables are not dynamic.
- C. All user variables are 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 # 30
You can perform a node estimate when adding a HeatWave cluster to a DB system in OCI Console. Which two tasks are performed by the node estimate process? (Choose two.)
- A. Estimate the number of OCPUs required to process selected user tables.
- B. Estimate the disk storage required for each user table.
- C. Estimate the memory required for each user table.
- D. Generate a set of alter statements to load selected tables into the HeatWave cluster.
- E. Generate a load command to activate Auto Parallel Load.
Answer: A,C
Explanation:
When performing a node estimate while adding a HeatWave cluster to a DB system in OCI Console, the process undertakes the following tasks:
* Estimate the number of OCPUs required to process selected user tables(Answer B): The node estimation process calculates the necessary OCPUs based on the size and complexity of the tables selected by the user. This ensures that the cluster has adequate processing power for efficient performance.
* Estimate the memory required for each user table(Answer C): This task involves determining the memory requirements for each table that will be loaded into the HeatWave cluster. This ensures that there is sufficient memory to handle the data and execute queries efficiently.
References:
* OCI Console Documentation on HeatWave
* MySQL HeatWave User Guide
NEW QUESTION # 31
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 regional subnet
- B. A private AD-specific subnet
- C. A public AD-specific subnet
- D. A public regional subnet
Answer: A,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 # 32
You want to create a read replica on a DB system.
Which is true about the read replica?
- A. It must have at least 4 OCPUs.
- B. lt must have at least 64 GB of memory.
- C. It must be a bare metal shape
- D. It must have at least 1 TB of storage
Answer: B
Explanation:
For a read replica on a DB system,it must have at least 64 GB of memory(Answer D). This requirement ensures that the read replica has sufficient resources to handle read operations and maintain performance consistency with the primary DB system.
References:
* OCI MySQL Read Replicas Documentation
NEW QUESTION # 33
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. SET optimizer_trace="enabled=on";
- B. SET use_secondary_engine=FORCED;
- C. SET secondary_engine_cost_threshold=1000;
- D. CALL sys.heatwave_load('["airport_geo"]');
- E. CALL sys.heatwave_advisor(JSON_OBJECT("auto_enc", JSON_OBJECT("mode", "recommend")));
Answer: B,C
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 # 34
Which placement is NOT valid for a high-availability DB system? (Note: AD refers to availability domain and FD refers to fault domain.)
- A. Primary instance: AD1-FD3; Secondary instance 1: AD2-FD2; Secondary instance 2: AD3-FD3
- B. Primary instance: AD1-FD1; Secondary instance 1: AD2-FD2; Secondary instance 2: AD3-FD3
- C. Primary instance: AD1-FD3; Secondary instance 1: AD1-FD2; Secondary instance 2: AD1-FD3
- D. Primary instance: AD1-FD1; Secondary instance 1: AD1-FD2; Secondary instance 2: AD1-FD3
Answer: C
Explanation:
In a high-availability DB system, the placement of primary and secondary instances should ensure redundancy across different availability domains (ADs) and fault domains (FDs) to minimize downtime and data loss. The placement mentioned in option D is not valid because itplaces the primary and secondary instances in the same availability domain and fault domain, which does not provide high availability.
NEW QUESTION # 35
What must you do to minimize a DB system down time caused by automatic maintenance operations?
- A. Enable high availability.
- B. Enable crash recovery.
- C. Add HeatWave cluster.
- D. Create read replicas.
Answer: A
Explanation:
To minimize DB system downtime caused by automatic maintenance operations, you should enable high availability. High availability ensures that there are multiple instances of your database running in different fault domains or availability domains, reducing the impact of maintenance on the system's availability.
NEW QUESTION # 36
You want to restore the backup of a stand-alone DB system to a new DB system.
Which two changes are allowed? (Choose two.)
- A. Use a different subnet for the new DB system.
- B. Use a different shape for the new DB system.
- C. Use a different tenancy for the new DB system.
- D. Use a smaller data storage size for the new DB system.
- E. Use a different region for the new DB system.
Answer: A,B
Explanation:
When restoring the backup of a stand-alone DB system to a new DB system, the following changes are allowed:
* Use a different subnet for the new DB system(Answer B): You can select a different subnet within the same VCN or a different VCN for the new DB system, providing flexibility in network configuration.
* Use a different shape for the new DB system(Answer C): You can choose a different compute shape for the new DB system, allowing you to scale the compute resources according to the requirements.
References:
* OCI MySQL Database Service Backup and Restore Documentation
NEW QUESTION # 37
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