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One major problem when using Text Mining in PL/SQL is, that sooner or later associative arrays or even nested tables are required to store large lists of words and their attributes. Those collections are very slow to iterate. Now you may think, that a hashed value of a word you need to find can be used as index, what would be much faster here. Well, it would be. But Oracle 11g2 contains no hash value function, that will return unique results on lists with 10.000 words. On several tests I got double values after ~86 words, independent of the size you specify at the function parameters. I tried ORA_HASH as well as the DBMS_CRYPTO package's HASH -function. It was the similar problem. Dependent of this problem and the long run times of the procedures mining the text, it was necessary to speed up the algorithm somehow. And the algorith was just iterating across a collection (nested table), comparing each entry with the wanted word, what was very slow. Here I got an idea. I used alrea