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I try to fill a string with 4500 Characters into the database ( a column with datatype long) but only 4098 characters are stored.

I tried an older version of ODAC´s (4.50.2.19) without changing one line of code only (~1300) characters where stored

So how can I store the whole string without loosing characters

We cannot reproduce your problem. Please specify versions of ODAC that you use now, version of Oracle client, Oracle Server, server charset. Please check TOraParam.DataType for parameter that you use with INSERT statement. It must be ftMemo. Send us please small demo project to demonstrate the problem and include script to create server objects to ODAC support address.