I have a requirement where a text field char size(255) is not sufficient and I have used that text field in various codes.
If I change datatype from Text to Text Area (Long) will my other functionality get hampered ?
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1It shouldn't.. you can try this in any sandbox – Goki Dec 22 '15 at 5:54
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1you can refer this page for considerations while changing data type Notes on Changing Data Type. – mohammed azarudeen Dec 22 '15 at 6:00
If your text field is referenced anywhere in Apex code, you won't be able to change the data type until all references are removed.
See this answer for more information on exactly what is involved in doing this.
Other than that (admittedly considerable) issue, there should not be any problems changing from a text field to a long text area. You should not experience any data loss as they are compatible fields.
