# 203 Index Key Sizes Over 245 Bytes Causing an Invalid Pointer Operation Error

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I'm developing an application using DBISAM database system ande Delphi 3.0 and I encountered the following probem:

I developed my application with as small database just for testing but when I changed my database (same structure) with the final one (much larger) everytime I change the Index of a table at run-time or , sometimes, when I scroll a dbgrid connevted to a table I get an exception saying 'Invalid pointer operation'.