On Huawei's Network Management System (NMS), such as iMaster NCE, data dumping is a critical function for archiving historical data (e.g., alarms, performance metrics) and preventing database overload. The system supports three distinct types of data dumping tasks:

1. Periodic dumping: Data is automatically dumped to files at a scheduled, recurring interval (e.g., daily, weekly).

2. Overflow dumping: Data is automatically dumped when the database's table space usage exceeds a predefined high-watermark threshold, ensuring system stability.

3. Manual dumping: An administrator initiates the data dump process on-demand, typically for immediate backup or before maintenance activities.

These three methods provide a comprehensive data management strategy.

B. Automatic dumping: This is a general classification that describes how some dumps are triggered (i.e., without manual intervention). It encompasses both periodic and overflow dumping and is not a distinct, configurable dumping type itself.

1. Huawei iMaster NCE-IP Product Documentation: In the section on Performance Management

under "Managing Historical Performance Data

" the documentation specifies the creation of dumping tasks. It explicitly lists the "Task type" options as "Manual dump"

"Periodic dump"

and "Overflow dump". This confirms these three are the recognized types. (Reference: iMaster NCE-IP Administrator Guide

Chapter on Performance Management > Managing Historical Performance Data).

2. Huawei iMaster NCE-Campus Administrator Guide: The guide's section on System Maintenance and Data Management details the policies for handling historical data. It describes setting up "dumping policies" which are categorized as Manual

Periodic (scheduled)

and Overflow (triggered by database capacity thresholds). (Reference: iMaster NCE-Campus Administrator Guide

Section on System Management > Data Backup and Restoration).