I am trying to set an index on a field in my table, but am getting the
following error:


    BLOB column 'ReadBy' used in key specification without a key length


The fieldtype is blob, though I get the same error whether blob or text, or
the medium and long versions of each.  My first though, based on the error,
was I needed to set a length to the field - but it won't accept/store any
length I give it (because it's a variable length?)


I'm using mysql on from 1and1 (hosting provider), though I don't know what
version they're running


.. any thoughts?



As an alternative, how much less efficient would it be to do a ".LIKE
'%mystring%'" versus a MATCH..?



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