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NEW QUESTION # 11
There are more than 10 concurrent users running queries on the DB system. The airport_geo table has been loaded successfully into a HeatWave cluster.
You want to run this query:
SELECT DISTINCT country FROM airport_geo ORDER BY country;
How do you determine whether the query is offloaded to the HeatWave cluster for execution?
- A. Check the value of the hw_data_scanned global status variable.
- B. View the Query Execution Plan of the query by running EXPLAIN.
- C. Check the value of the rapid_query_offload_count global status variable.
- D. Query the rpd_tables table in performance_schema.
Answer: C
Explanation:
To determine whether a query is offloaded to the HeatWave cluster for execution,check the value of the rapid_query_offload_countglobal status variable(Answer B).
* rapid_query_offload_count: This variable indicates the number of queries that have been offloaded to the HeatWave cluster. By checking its value before and after running the query, you can determine if the query was offloaded.
Steps:
* Connect to the MySQL DB system.
* RunSHOW GLOBAL STATUS LIKE 'rapid_query_offload_count';before and after executing the query to see if the count increases, indicating offloading.
References:
* MySQL HeatWave Documentation
* Monitoring HeatWave Status Variables
NEW QUESTION # 12
Which two are true about read replica load balancer? (Choose two.)
- A. It is created when the DB system is first created.
- B. User accounts containing a client host name cannot connect to the read replica load balancer.
- C. It distributes connections among read replicas.
- D. It distributes connections among the source DB system and all read replicas.
- E. It has the same endpoint as the DB system.
Answer: C,D
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 # 13
A port-forwarding Bastion session has been created for a MySQL DB system listening on 10.10.1.187:3306.
The SSH command provided by the Bastion session is:
An SSH tunnel is created successfully on a client machine by running this command:
Which command connects to the MySQL DB System from the client machine?
- A. mysqlsh mysql://[email protected]:3306
- B. mysqlsh mysql://[email protected]:3311
- C. mysqlsh mysql://[email protected]:3311
- D. mysqlsh mysql://[email protected]:3306
Answer: C
Explanation:
Given the SSH command sets up port forwarding from the local port3311to the remote MySQL DB system port3306, the correct command to connect to the MySQL DB system from the client machine is:
C:mysqlsh mysql://[email protected]:3311
This command connects to the local machine's port3311, which forwards the connection to the MySQL DB system at10.10.1.187:3306.
NEW QUESTION # 14
You have successfully enabled high availability of a stand-alone DB system. Which is true?
- A. The DB system has three instances running in different availability or fault domains.
- B. The DB system performs load balancing by distributing client connections to all instances.
- C. The DB system provides new endpoints to connect to the secondary instances for read-only connections.
- D. The DB system provides new port numbers on the same endpoint to connect to the secondary instances for read-only connections.
Answer: A
Explanation:
When high availability is enabled for a stand-alone DB system,the DB system has three instances running in different availability or fault domains(Answer D).
* High Availability Configuration: This setup involves creating multiple instances of the DB system across different availability or fault domains to ensure redundancy and minimize the risk of downtime due to hardware or network failures.
* Instances: Typically, there are three instances-one primary and two replicas-ensuring that the system can failover seamlessly if one instance goes down.
References:
* OCI MySQL High Availability
NEW QUESTION # 15
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 API key-pair is specified in the -/. oci. config file.
- B. The credential is stored in an OCI vault secret.
- C. The correct password is saved in the local MySQL Shell secret store.
- D. The operating system user credential is used to authenticate with the DB system.
Answer: A
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 # 16
Which MySQL HeatWave AutoML routine evaluates a model?
- A. ML_TRAIN
- B. ML_PREDICT_TABLE
- C. ML_EXPLAIN_TABLE
- D. ML_SCORE
- E. ML_EXPLAIN
Answer: D
Explanation:
The MySQL HeatWave AutoML routine that evaluates a model isML_SCORE. This routine scores a trained machine learning model on a new dataset and evaluates its performance.
NEW QUESTION # 17
You want to determine which version of MySQL is running on your DB system.
Which two SQL statements show the MySQL version? (Choose two.)
- A. SELECT @version;
- B. SELECT * FROM performance_schema.global_status WHERE VARIABLE_NAME='version';
- C. select @@version;
- D. SHOW STATUS LIKE 'version';
- E. SHOW VARIABLES LIKE 'version';
Answer: C,E
Explanation:
To determine the version of MySQL running on your DB system, you can use the following SQL statements:
* SELECT @@version;(Answer B): This query retrieves the MySQL server version from the system variables.
* SHOW VARIABLES LIKE 'version';(Answer C): This query displays the server version along with other related version variables.
Steps:
* Connect to your MySQL DB system.
* Execute eitherSELECT @@version;orSHOW VARIABLES LIKE 'version';to retrieve the version information.
References:
* MySQL Server Version Information
* SHOW VARIABLES Syntax
NEW QUESTION # 18
Automatic backup retention of a DB system is disabled. Which operation deletes all automatic backups of the DB system?
- A. Disabling point-in-time recovery
- B. Deleting the DB system
- C. Disabling delete protection
- D. Enabling point-in-time recovery
Answer: B
Explanation:
When automatic backup retention of a DB system is disabled,deleting the DB system(Answer C) will delete all automatic backups of the DB system.
* Automatic Backups: These are backups created automatically by the OCI service to ensure data protection.
* Backup Deletion: If automatic backups are disabled and you delete the DB system, all associated automatic backups are also deleted. This operation is irreversible, and you should ensure that necessary backups are taken before deleting the DB system.
References:
* OCI MySQL Database Service Backup and Restore
NEW QUESTION # 19
How can you determine the uptime of a DB system?
- A. By executing mysql db-system get --db-system-id with OCI CLI
- B. By checking the DB system details in the OCI Web console
- C. By using the Audit section in Logging information in the OCI Web console
- D. By querying performance_schema.global_status from a connected MySQL client
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 # 20
Which feature do you use to copy transactions from an on-premises MySQL instance to a DB system?
- A. Read replica
- B. Inbound replication
- C. HeatWave cluster
- D. Outbound replication
Answer: B
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 # 21
A query is not offloaded to the HeatWave cluster for execution. Which three are possible reasons? (Choose three.)
- A. The client is connected to the DB system instead of the HeatWave cluster.
- B. The use_secondary_engine session variable is OFF.
- C. The user does not have privileges to access the HeatWave cluster.
- D. The query estimated cost is less than the query cost threshold.
- E. A required column is excluded from the RAPID secondary engine.
Answer: A,B,E
Explanation:
A query may not be offloaded to the HeatWave cluster for execution due to the following reasons:
A:Theuse_secondary_enginesession variable is OFF: This setting controls whether queries should be offloaded to the secondary engine (HeatWave). B.The client is connected to the DB system instead of the HeatWave cluster: For queries to be offloaded, the client must be connected to the HeatWave cluster. E.A required column is excluded from the RAPID secondary engine: If a necessary column is not available in the HeatWave (RAPID) secondary engine, the query cannot be offloaded.
NEW QUESTION # 22
Which type of configuration variables CANNOT be modified in MySQL custom configurations?
- A. Default user variables
- B. Initialization variables
- C. User variables
- D. System variables
Answer: B
Explanation:
Initialization variables(Answer A) cannot be modified in MySQL custom configurations. These variables are set at the start of the MySQL service and are not changeable without restarting the service.
* Initialization variables are parameters that define how the MySQL server initializes.
* Changes to these variables require restarting the MySQL server to take effect.
* Examples include variables likeinnodb_buffer_pool_size, which determine memory allocation settings on startup.
References:
* MySQL Configuration Variables Documentation
NEW QUESTION # 23
Which is true about exporting data to Object Storage with MySQL Shell util.dumpInstance?
- A. You must have a valid OCI CLI configuration.
- B. You must specify ociParManifest: true.
- C. You must provide an OCI username and password to gain write access to Object Storage.
- D. You must specify ocimds: true.
Answer: B
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 # 24
You want to create a second user called admin2 with the same privileges as the administrator specified when creating the DB system.
Which statement helps you achieve this?
- A. CREATE USER admin2 IDENTIFIED BY 'Password' DEFAULT ROLE 'administrator';
- B. CREATE USER admin2 IDENTIFIED BY 'Password'; GRANT SUPER ON *.* TO admin2 WITH GRANT OPTION;
- C. CREATE USER admin2 IDENTIFIED BY 'Password'; GRANT ALL PRIVILEGES ON *.* TO admin2 WITH GRANT OPTION;
- D. CREATE USER admin2 IDENTIFIED BY 'Password'; GRANT AUDIT_ADMIN,
BACKUP_ADMIN, SESSION_VARIABLES_ADMIN ON *.* TO admin2 WITH GRANT OPTION;
Answer: C
Explanation:
To create a second user calledadmin2with the same privileges as the administrator, you can use the following statement:
D:CREATE USER admin2 IDENTIFIED BY 'Password'; GRANT ALL PRIVILEGES ON *.* TO admin2 WITH GRANT OPTION; This creates the useradmin2and grants all privileges, along with the ability to grant those privileges to other users.
NEW QUESTION # 25
Which two are benefits of read replicas? (Choose two.)
- A. Reduce down time.
- B. Speed up analytical queries.
- C. Scale read queries.
- D. Reduce query latency.
- E. Reduce network latency.
Answer: C,D
Explanation:
A:Reduce query latency: By distributing read queries across multiple replicas, the load on the primary instance is reduced, which can decrease query latency. D.Scale read queries: Read replicas allow scaling of read operations by providing additional instances to handle read queries, improving overall performance and throughput.
NEW QUESTION # 26
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