This topic describes the system events of PolarDB instances.

Type Event Description State Level
Exception Instance_Failure_End The instance failure ends. Executed Critical
Exception Instance_Failure_Start The instance failure starts. Executing Critical
Exception SyncStatusAbnormal A synchronization exception occurs. Abnormal Critical
Maintenance Instance:SystemMaintenance.Transfer:Scheduled The instance migration is scheduled. Scheduled Warn
Maintenance Instance:SystemMaintenance.Transfer:Executing The instance is being migrated. Executing Warn
Maintenance Instance:SystemMaintenance.Transfer:Executed The instance is migrated. Executed Warn
Maintenance Instance:SystemMaintenance.Transfer:Canceled The instance migration is canceled. Canceled Warn
Maintenance Instance:SystemMaintenance.MinorVersionUpgrade:Scheduled The instance update to a minor version is scheduled. Scheduled Warn
Maintenance Instance:SystemMaintenance.MinorVersionUpgrade:Executing The instance is being updated to a minor version. Executing Warn
Maintenance Instance:SystemMaintenance.MinorVersionUpgrade:Executed The instance is updated to a minor version. Executed Warn
Maintenance Instance:SystemMaintenance.MinorVersionUpgrade:Canceled The instance update to a minor version is canceled. Canceled Warn
Maintenance Instance_Failover The failure-triggered switchover between the primary instance and a secondary instance starts. Executed Warn
Maintenance Instance:SystemMaintenance.ScheduledOperation:Scheduled The O&M operation on the instance is scheduled. Scheduled Warn
Maintenance Instance:SystemMaintenance.ScheduledOperation:Executing The O&M operation on the instance is being performed. Executing Warn
Maintenance nstance:SystemMaintenance.ScheduledOperation:Executed The O&M operation on the instance is performed. Executed Warn
Maintenance Instance:SystemMaintenance.ScheduledOperation:Canceled The O&M operation on the instance is canceled. Canceled Warn
InstanceMaintenance Instance_Switchover The task-triggered switchover between the primary instance and a secondary instance starts. Executed Warn