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RE: Bind values missing from SQL trace

From: Dunbar, Norman <>
Date: Thu, 16 Aug 2007 08:02:55 +0100
Message-ID: <919FC80F27E0C6428106496EDF92A7525F6572@EXCCLUS05.PRODDS.NTNL>

Morning Rich,

>> My only evidence is that trying to duplicate the statement
>> using nulls or blanks for those variables returns no rows,
>> where the app clearly does.

This is a giveaway :

 bind 0: dty=1 mxl=128(50) mal=00 scl=00 pre=00 oacflg=03 oacfl2=800010 size=160 offset=0

   bfp=11058efc0 bln=128 avl=50 flg=05

The MXL=128(50) says max length is 128 current length is 50. Also, the AVL=50 confirms that the actual length of the bind data is indeed 50.

So, you are passing a 50 character value over. If, as others have suggested, you were passing NULL then AVL would be zero. The number in parenthesis after the MXL is 'random' in that instance - cannot be trusted.

Jonathan has an example showing this very thing :

And I quote :

"on a hunch I generated two traces, one when using nvarchar2 as datatype for the bind variable and one using varchar2 as datatype. And indeed, the one where I used the nvarchar2 datatype was showing the full table scan and lacked the values for the bind variables in the trace files, while the one with the varchar2 datatype was using the index and had the bind values filled in."

So, it could be that the use of 'N' data types precludes their use in the trace file - maybe because they wouldn't show up correctly in the trace file perhaps if they were in some 'exotic' character set?


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Received on Thu Aug 16 2007 - 02:02:55 CDT

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