I am running the Query using Automation with the help of Data Extension, it is showing error like

String or binary data would be truncated.

enter image description here

But i have the Maximum field length also, what ever i have give the value it is showing error,How to Rectify the Error

enter image description here

Any Help Appreciated

2 Answers 2


The issue is with SMTPBounceReason. This field can return an excess of 4000 characters. To bypass this, remove leave the length field blank. This will force it to VARCHAR(MAX) (Over 4000 characters).


  • Is there a way to get the actual field name that is causing this? I have the same error, however it is a bunch of custom fields that I have, so I am quite lost as i am no tsure if i should just test 1 by one?
    – manza
    Oct 4, 2018 at 2:22

[Incase anyone else comes across this issue...]

Useful article on how to optimize SQL queries:

Relational Data

The Marketing Cloud data environment, exposed via Data Extensions, is relational. It is possible to designate fields in Data Extensions as a Primary Key. The values stored therein can similarly be placed in another Data Extension to operate as a Foreign Key. By doing so, those two data sets can be logically linked to enable greater sophistication for data storage and analysis procedures.

Any Data Extension spanning a cumulative field width greater than 4000 characters must be avoided. Avoiding excessive width is typically achieved by use of two Data Extensions that have been related via a Primary/Foreign Key relationship.

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .