# Service Data Maintenance

This section describes how to maintain anti-DDoS data by setting appropriate data reservation duration to ensure high resource usage.

#### Procedure

1. Choose System > Data Maintenance > Service Data Maintenance
2. On the Service Data Maintenance page, click .

3. On the Modify Service Data Maintenance Settings page, set parameters by referring to Table 1.

   Table 1 Parameters of maintaining Service data
   Parameter | Description | Value
   --- | --- | ---
   Five-Minute Summary Data (days) | Indicates the reservation duration of original data in the database of the anti-DDoS collector. | The default value is 30.
   Hourly summary data (months) | Indicates the reservation duration of hourly summary data in the database of the anti-DDoS collector. | The default value is 12.
   Daily summary data (years) | Indicates the reservation duration of daily summary data in the database of the anti-DDoS collector. | The default value is 1.
   Traffic diversion log (days) | Indicates the reservation duration of traffic diversion logs in the database of the cleaning device. | The default value is 90.
   Device logs (days) | Indicates the duration for the ATIC Management center server to retain the operation logs in the database. | The default value is 30.
   Capture File(days) | Indicates the reservation duration of capture files in the database of the anti-DDoS collector. | The default value is 30.
   Scheduled daily reports (days) | Indicates the reservation duration of daily reports generated by a scheduled task in the database and hard disk of the ATIC Management center server. | The default value is 60.
   Scheduled weekly reports (months) | Indicates the reservation duration of weekly reports generated by a scheduled task in the database and hard disk of the ATIC Management center server. | The default value is 6.
   Scheduled monthly reports (years) | Indicates the reservation duration of monthly reports generated by a scheduled task in the database and hard disk of the ATIC Management center server. | The default value is 1.
   Scheduled yearly reports (years) | Indicates the reservation duration of yearly reports generated by a scheduled task in the database and hard disk of the ATIC Management center server. | The default value is 5.
   Delay for Canceling Traffic Diversion (seconds) | For dynamic diversion tasks (including both the automatic and manual ones), after the anomaly or attack ends, the diversion persists for a while before it is automatically canceled to ensure that the anomaly or attack traffic is thoroughly cleaned. | The default value is 300. In normal cases, you are advised to use the default value. If the anti-DDoS collector cannot receive the logs about the anomalies from the cleaning device, the delay can be extended.
   Blackhole Duration (Minutes) | For blackhole traffic diversion tasks created based on anti-DDoS cleaning devices, the system automatically cancels blackhole traffic diversion after this delay period. | The default value is 30.
   Blackhole Exemption Duration(Minutes) | During this time, there is no blackhole traffic diversion. | The default value is 30.
   Remote Alarm Notification Interval (seconds) | The system summarizes remote alarm notifications and sends them based on preset rules at the specified interval. | The default value is 600.
   The number of pagesize | Indicates the number of pagesize for ATIC Management center. | The default value is 10.

4. Click OK.

Parent topic: System Maintenance

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