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| Section | Weight | Objectives |
|---|---|---|
| Monitor, Optimize and Troubleshoot | 20% | - Troubleshoot common issues and errors - Optimize configurations and workloads - Monitor performance, alerts and resource usage |
| Deploy and Configure an NDB Solution | 20% | - Configure networking, security and access control - Install and configure NDB server and agents - Register clusters, database servers and engines |
| Describe NDB Concepts | 10% | - Explain features, use cases and business value - Define NDB terminology and components |
| Administer and Automate NDB | 15% | - Maintain multi-cluster environments - Manage profiles, software versions and updates - Use APIs, CLI and automation tools |
| Provision and Manage Database Lifecycle | 20% | - Manage clones, snapshots and refresh operations - Apply patches and upgrades - Create, modify and delete databases |
| Protect Databases with Time Machine | 15% | - Perform restore and point-in-time recovery - Configure SLA policies and retention |
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問題 #127
An online retail application requires data to be synchronized between multiple SQL Server databases.
This provides clearer reporting from multiple databases at the Same time for consistency at the end of each business day. What is the best way to fulfill this requirement?
答案：C
解題說明：
Nutanix Era enables you to clone your source databases and refresh the database clones by using snapshots or transaction logs. For an online retail application that requires data to be synchronized between multiple SQL Server databases, having all the databases present in the same Database Virtual Machine (DBVM) and registering them in Era with Multiple Databases as a Group with one Time Machine would be the most efficient way to fulfill this requirement. This approach allows for clearer reporting from multiple databases at the same time for consistency at the end of each business day.
問題 #128
What is the minimum frequency in minutes configurable for NDB Log Catch-up operation?
答案：C
解題說明：
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.
問題 #129
An administrator has noticed that the automatic snapshot and log catch-up (automatic and manual) activities for a Time Machine are halted and manual snapshots cannot be created.
What status is this Time Machine in?
答案：D
解題說明：
In NDB, a Time Machine manages snapshots and log catch-up operations for database protection and recovery. The scenario describes a Time Machine where automatic snapshot and log catch-up activities (both automatic and manual) are halted, and manual snapshots cannot be created. This indicates the Time Machine is in a PAUSED state.
In NDB, the Time Machine states are:
FROZEN: A temporary state during specific operations (e.g., cloning), but it doesn't halt all activities permanently.
OFFLINE: Indicates the Time Machine is unavailable or not operational, often due to connectivity or configuration issues, but this typically prevents access rather than just halting operations.
PAUSED: Explicitly stops all scheduled and manual snapshot/log activities, often manually triggered by an administrator or due to an error condition (e.g., resource constraints). Operations resume when unpaused.
READY: The normal operational state where snapshots and log catch-ups occur as scheduled.
Given the inability to create manual snapshots alongside halted automatic operations, PAUSED is the most fitting status, as it reflects an intentional or enforced suspension of activities.
問題 #130
An administrator is initially setting up Time Machine for a newly-provisioned database. What is the maximum number of snapshots per day that can be configured in the GUI?
答案：A
解題說明：
When setting up a Time Machine for a newly-provisioned database in NDB, the GUI allows the administrator to configure the frequency of snapshots for data protection. The maximum number of snapshots per day that can be configured in the NDB GUI is 6. This limit ensures a balance between data granularity (for point-in-time recovery) and storage overhead, preventing excessive resource consumption. The administrator can schedule these snapshots at regular intervals (e.g., every 4 hours) within the Time Machine configuration wizard.
問題 #131
An administrator needs to create a custom PostgreSQL HA software profile. Which software component manages the state of the cluster and handles failover?
答案：A
解題說明：
NDB supports PostgreSQL HA software profiles for provisioning PostgreSQL databases with high availability. PostgreSQL HA software profiles consist of three components: etcd, HAProxy, and Patroni.
etcd is a distributed key-value store that provides a reliable way to store configuration data across a cluster of machines. etcd is used by Patroni to store and synchronize the cluster state and configuration.
HAProxy is a load balancer that distributes incoming requests to the PostgreSQL nodes.
HAProxy is used to expose a single endpoint for database connections even as the roles of the individual nodes change.
Patroni is a template for PostgreSQL high availability. Patroni is responsible for managing the state of the cluster and handling failover. Patroni uses etcd as the distributed configuration store and relies on HAProxy for load balancing.
Therefore, the software component that manages the state of the cluster and handles failover is Patroni.
問題 #132
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