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質問 # 216
What is the minimum frequency in minutes configurable for NDB Log Catch-up operation?
正解：C
解説：
The minimum frequency configurable for the NDB Log Catch-up operation is 15 minutes. This setting determines how frequently the log catch-up process runs, which is crucial for maintaining data integrity and ensuring up-to-date database states.
References: Nutanix Database Automation documentation, focusing on log management and catch-up operation settings.
質問 # 217
An administrator is trying to register a Nutanix cluster for Multi-Cluster provisioning.
The Era cluster is setup with following configuration:
* Era Multi-Cluster is enabled.
Era Server storage container and Era provisioning container are different on the Era cluster.
What should the administrator configure?
正解：D
解説：
In a Nutanix Era setup where Multi-Cluster is enabled and the Era Server storage container and Era provisioning container are different on the Era cluster, the administrator should configure a storage mapping between the Era server container and the remote container that is used for provisioning databases1. This is because Nutanix Era uses the storage container specified during the registration of the Nutanix cluster for provisioning databases1. Therefore, a storage mapping needs to be established between the Era server container and the remote container used for provisioning to ensure that the databases are provisioned correctly1.
質問 # 218
A database administrator is working with a cloned database and creates a clone removal schedule.
Which two default actions are taken on the cloned database? (Choose two.]
正解：B、C
解説：
When a database administrator creates a clone removal schedule in NDB, the system automates the cleanup of cloned databases based on the defined schedule (e.g., after a set retention period). The two default actions taken on the cloned database are:
* A. NDB deletes the cloned database: The clone's data is removed from storage to free up space.
* B. NDB de-registers the cloned database: The clone is removed from NDB's management inventory, ensuring it no longer appears in the GUI or is tracked.
Other options are not default actions:
* C. NDB marks the cloned database as offline: This is a temporary state, not a removal action.
* D. NDB deletes the cloned database VM: Deleting the VM is not automatic; it depends on the clone type (e.g., linked clones retain the VM).
Thus, the verified answers are A and B, aligning with NDB's clone management.
Official Nutanix Database Automation References
* Nutanix Database Management & Automation (NDMA) course, Module 5: Data Protection and Recovery, Lesson 5.2: Managing Clones and Removal Schedules.
* Nutanix Certified Professional - Database Automation (NCP-DB) v6.5 Knowledge Objectives, Section
5: Protect Databases Using NDB, Objective 5.2: Manage Clone Removal (applicable to v6.10).
* Nutanix NDB Administration Guide: "Clone Removal Schedule Actions" section.
質問 # 219
A new web application performs up to 200 concurrent connections to a PostgreSQL database. An administrator needs to configure the system to provision those DB servers.
Which action would easily help the administrator achieving this goal?
正解：D
解説：
A new web application with up to 200 concurrent connections to a PostgreSQL database requires a robust and scalable configuration. Provisioning a PostgreSQL HA (High Availability) instance in NDB is the most effective action to achieve this goal. An HA instance leverages replication (e.g., streaming replication) to distribute load and ensure availability, accommodating high concurrency by allowing multiple nodes to handle traffic. This approach simplifies configuration compared to manual scripting or parameter adjustments.
* Option A (Use Post Create Command when provisioning the DB) is incorrect because post-create commands are for custom scripts, not optimal for handling concurrent connections.
* Option B (Create a new Database Parameters profile) is incorrect because while it can tune settings, it's less efficient than HA for scaling concurrency.
* Option C (Edit the API equivalent shell script) is incorrect as it's a manual and error-prone method compared to HA provisioning.
* Option D is correct because a PostgreSQL HA instance natively supports high concurrency and availability.
Note: The typo "PostqreSQL" is assumed to mean "PostgreSQL."
References
* Nutanix Database Service (NDB) User Guide, Chapter 4: Managing Database Engines, Section:
Provisioning HA Instances
* Nutanix Certified Professional - Database Automation (NCP-DB) v6.5 Blueprint, Section 4: Manage Database Engines
質問 # 220
A request is received to refresh a database clone from a new manual snapshot. When the administrator attempts to create the new snapshot from the Time Machine, it is in a Frozen state.
What causes a Time Machine to enter the Frozen state and what are the administrator's options to complete the request?
正解：A
解説：
A Time Machine is a core construct of the copy data management service in NDB that captures and manages the data of a database to deliver a recovery point objective (RPO) SLA. A Time Machine can enter a Frozen state for various reasons, such as database de-registration, snapshot or log catchup failures, or manual intervention. When a Time Machine is in a Frozen state, it stops taking new snapshots and log backups, and cannot perform any clone, refresh, or restore operations. To resume the normal operation of a Time Machine, it must be thawed by resolving the root cause of the freeze. One of the common causes of a Time Machine freeze is when the database is de-registered from NDB without removing the Time Machine. This can happen when the administrator wants to move the database to a different NDB instance or cluster, or when the database is accidentally de-registered. In this case, the Time Machine becomes orphaned and frozen, and cannot be used for any operations. To complete the request to refresh a database clone from a new manual snapshot, the administrator must first re-register the database in NDB using the same database name and ID as before. This will automatically thaw the Time Machine and resume its operation. The administrator can then create a new manual snapshot from the Time Machine and use it to refresh the database clone. The other options are not correct, as they either require unnecessary steps or do not address the root cause of the freeze. References:
Nutanix Certified Professional - Database Automation (NCP-DB) v6.5, Section 5 - Protect NDB-managed Databases Using Time Machine, Objective 5.1: Create, delete, and modify SLA retention policies Nutanix Database Management & Automation (NDMA) Course, Module 4: Nutanix Database Service (NDB) Data Protection, Lesson 4.1: Data Protection Overview, Topic: Time Machine Concepts Nutanix Support & Insights, TN-2101: Nutanix Database Service Time Machine Under the Hood, Section:
Time Machine States and Transitions
質問 # 221
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