Question

I have created the follow TSQL trigger that appears to be running forever whenever the underlying table gets updated.

CREATE TRIGGER Trigger_MDSS_ComputeAggregates
ON dbo.MonthlyDetectionScoresSums
AFTER UPDATE, INSERT
AS
BEGIN


update dbo.MonthlyDetectionScoresSums
SET
YPElec = CAST(COALESCE (i.YPLocChain_TotElec, i.YPGlobChain_TotElec, i.YPSIC_TotElec) AS real),
YPGas = CAST(COALESCE (i.YPLocChain_TotGas, i.YPSIC_TotGas) AS real)
from MonthlyDetectionScoresSums mdss
inner join INSERTED i on i.ACI_OI = mdss.ACI_OI

END
GO

Do you know why it might be running for a really really long time?

Answer 1

Do you have recursive triggers turned on?

Although an infinite loop should be terminated, it’s possible if your update is very large that it takes a long time to get to the nesting limit of 32:

http://msdn.microsoft.com/en-us/library/ms190739.aspx