Dear ! As far as I know, the meta key display will be 256 characters, is there any way to expand it or not?
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Alternatively, from the RSA Customer Support page, click on Ask A Question on the blue navigation bar and choose Ask A Product Related Question. From there, scroll to RSA NetWitness Platform" data-type="space and click Ask A Question. That way your question will appear in the correct space.
If you are asking if a meta key can hold more than 256 bytes, the answer is no, that is the hard limit.