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Why Do Previous Alarms Fail to Be Queried?
Question
Why do previous alarms fail to be queried?
Answer
- Previous alarms in the current-alarm list cannot be queried.When the number of current alarms in the database reaches the maximum capacity, alarm management applies the following rules to move some alarms to the historical-alarm list until the number of current alarms falls to the proper range.
- Move cleared alarms, acknowledged and uncleared ADMC alarms, acknowledged and uncleared ADAC alarms, and unacknowledged and uncleared alarms to the historical-alarm list in sequence.
- Move earlier alarms to the historical-alarm list first.
- Previous alarms in the historical-alarm list cannot be queried.
Alarm management performs automatic detection at one o'clock everyday, and triggers the dumping mechanism for events, masked alarms, and historical alarms. Dumped alarms cannot be queried in the historical-alarm list. Alarms are dumped based on the following rules:
- If the database tablespace usage reaches 80%, alarm management dumps the data in the database to files according to the sequence of occurrence time and the data table type (event, masked alarm, or historical alarm).
- If alarm management detects that the data in the database table is generated 90 days ago, it dumps the database table.
- The dumped file will be deleted after 180 days.
- If the total size of the dumped files exceeds 1 GB or the total number of files exceeds 1000, the system deletes the earliest files.