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I have to post the text in a textarea to the dbase, so is it better to make a text field in the dbase, or have it written in a text file and then just put the link to the file in the dbase?
Depends on how much text there is take a look at the database manual to see how much data each field type can hold. Usually TEXT or BLOB are large enough - if there not, then you can save the text in a file, or maybe split it up in the database.
it's often just fine to use the database to store it in it's in entirity.. most, if not all databases will compress the "text" data automatically for you.