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SQL Trigger and performance

Last Modified: 2012-08-18
I have a table called SMS_log that logs SMS messages. If a message is sent correct the "ok" field is True, if it fails the "ok" field is false.

I have a SQL Trigger that check if the message is sent or not. If its not ("ok" = 0) the message shall be sent again (but from another number / system).

My question is:
Can SQL Triggers like mine (see attached code) cause a performance issue? Sometimes we send about 2500 messages at the same time. Is there something in my code that can be optimized to increase the performance?

ALTER TRIGGER [dbo].[trgErrorHandler]
   ON  [dbo].[SMS_Out_Log] 
   for insert

	DECLARE @MsgId varchar(18)
	DECLARE @FromNumber varchar(18)
	DECLARE @Tel varchar(18)
	DECLARE @Msg varchar(160)
	DECLARE @PriceGroup varchar(8)
	DECLARE @CampaignId varchar(8)
	DECLARE @Ok bit
	DECLARE @ErrorCode varchar(50)
	DECLARE @SentWithOperator varchar(8)
	DECLARE @Type varchar(18)
	DECLARE @Description varchar(max)

	SET @Ok = (select ok from INSERTED)

	IF (@Ok = 0)

		SET @FromNumber = (select fromNumber from INSERTED)
		SET @SentWithOperator = (select SentWithOperator from INSERTED)
		SET @ErrorCode = (select ErrorCode from INSERTED)

		IF (@FromNumber = '5100' AND @SentWithOperator = '4711' AND @ErrorCode = '1030')

			-- Message info
			SET @MsgId = (select msgID from INSERTED)
			SET @Tel = (select Tel from INSERTED)
			SET @Msg = (select msg from INSERTED)
			SET @PriceGroup = (select PriceGroup from INSERTED)
			SET @CampaignId = (select CampaignID from INSERTED)
			SET @Type = (select Optional2 from INSERTED)
			SELECT @Description = Optional1 from SMS_Out_Log where msgID = @MsgId

			-- Resend message from another number
			Insert into SMS_Out 
			(fromNumber, Tel, msg, PriceGroup, Operator, Optional1, Optional2, CampaignID) 
			('6300', @Tel, @Msg, @PriceGroup, '0', @Description, @Type, @CampaignId)



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