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Editorial Team
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Asked: 2026-06-14T19:41:01+00:00

I have a simple DataFlow with two objects the source which is a mdb

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I have a simple DataFlow with two objects the source which is a mdb file and the destination which is an MSSQL database.

The idea is to migrate the data from one to another.

The problem is that the data is extracted from an Access query, and one column has ~1000 characters, and in SSIS in advanced properties the external column has the default 255 length so when i execute the task it tries to truncate it. To disable the throw error on truncate is not an option, and modifying the Length of the external column cannot be done, it throws and error regarding the metadata.

First of all can anyone explain WHY?

Second of all i need a resolution and i need it fast because it’s kinda driving me crazy.

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1 Answer

  1. Editorial Team

    Access supports queries which are the equivalent to views in MSSQL.
    The column size is defined not by looking at a few results but by the default column length of the column data type.

    I created another table with the desired data types and before the data flow i’ve put in the package 2 sql scripts: one to delete all the data in the table and one to execute the query against the table, as to treat it as a temporary table.

    Then the actual data flow is executed against this pseudo-temporary table.

    This solved my problem.

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