Why don't you use some type of hash like md5 for indexing ?
2010/11/30 Rob Sargent <robjsargent@gmail.com>:
> Were we to create a table which included a text field for a small block
> of xml (100-1000 chars worth), would an index on that field be useful
> against exact match queries?
>
> We're wondering if a criterion such as "where 'a string expected to be
> of size range 100 to 500' = tabelWithStrings.stringSearched" would make
> good use of an index on "stringSearched" column.
>
> The key is that there will only be exact match queries.
>
> Thanks for your thoughts.
>
>
>
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