Help Center/ GaussDB(DWS)/ Management Guide/ Monitoring and Alarms/ Alarms/ Alarm Handling/ DWS_2000000023 Vacuum Full Operation That Holds A Table Lock Exceeds the Threshold

Updated on 2024-09-05 GMT+08:00

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DWS_2000000023 Vacuum Full Operation That Holds A Table Lock Exceeds the Threshold

Alarm Description

VACUUM FULL holds a level-8 lock on a table. If it holds the lock on a table for longer than 20 minutes (or another user-defined value), a major alarm is reported, indicating that the VACUUM FULL operation holds a lock for too long in the cluster. This major alarm is cleared when VACUUM FULL is complete.

Attributes

Alarm ID	Alarm Category	Alarm Severity	Alarm Type	Service Type	Auto Cleared
DWS_2000000023	Management plane alarm	Important	Operation alarm	GaussDB(DWS)	Yes

Alarm Parameters

Category	Name	Description
Location information	Name	A Vacuum Full Operation That Holds a Table Lock for A Long Time Exists in the Cluster
	Type	Operation alarm
	Generation time	Time when the alarm is generated
Other information	Cluster ID	Cluster details such as resourceId and domain_id

Impact on the System

Other operations cannot the table. As a result, workloads cannot be executed.

Possible Causes

There is a VACUUM FULL operation that holds a table lock for a long time in the cluster.

Handling Procedure

In the navigation pane of the monitoring panel, choose Monitoring > Real-Time Queries > Sessions. In the session list, set the search criteria to LIKE and search for the keyword vacuum full.
Check whether there is a table lock waiting for VACUUM FULL to complete by querying the locked object.
Check whether the VACUUM FULL operation needs to be handled.
1. Check whether VACUUM FULL is a system behavior and whether it affects system functions. If VACUUM FULL does not affect other service queries, wait until it is complete. The alarm will be automatically cleared.
2. If VACUUM FULL affects normal service execution, you can find and kill related sessions on the Real-Time Queries tab and re-execute VACUUM FULL later.