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Noise words and the alphabet file

The dtSearch engine references a default list of noise words and an alphabet file when it creates a new index. The noise words are not included in a dtSearch index to improve query performance and prevent unnecessary index growth. These commonly used words are ignored when you run a query. The alphabet file determines how single characters and spaces are handled in a query.

Note: If your dtSearches are not returning the expected results, you may want to consult your Relativity Administrator about updating the noise word list or alphabet file.

Alphabet file

The dtSearch engine uses an alphabet file to identify characters are treated as text, characters that cause word breaks, and characters that are ignored. Relativity Administrators can modify the default alphabet file when they create or edit a dtSearch index. See Making a character searchable.

An alphabet file contains the following character groups. For more information:

Note: The underscore (_) is not recognized as a space by default. Verify that a given character is defined as causing a word break before using it as a space in a dtSearch.

Default noise word list

The dtSearch engine is configured with the default noise words listed in the following table. Relativity Administrators can modify this list when they create or edit a dtSearch index. See Creating a New dtSearch Index.

Begins with... Noise words
A a, about, after, all, also, an, another, any, are, as, and, at
B be, because, been, before, being, between, but, both, by
C came, can, come, could
D did, do
E each, even
F for, from, further, furthermore
G get, got
H has, had, he, have, her, here, him, himself, his, how, hi, however
I i, if, in, into, is, it, its, indeed
J just
L like
M made, many, me, might, more, moreover, most, much, must, my
N never, not, now
O of, on, only, other, our, out, or, over
S said, same, see, should, since, she, some, still, such
T take, than, that, the, their, them, then, there, these, therefore, they, this, those, through, to, too, thus
U under, up
V very
W was, way, we, well, were, what, when, where, which, while, who, will, with, would
Y you, your

Making a character searchable

Note: The following characters can't be made searchable in a dtSearch index: “ ( ) * ? % @ ~ & : =

  1. Navigate to the dtSearch index.
  2. Click Edit and scroll down to the Alphabet section.
  3. Delete the character from the current category ("hyphen", "spaces", etc). Don't delete the category heading.
  4. Scroll to the top of the Alphabet section and scroll down to the first set of Z's.
  5. Create a new line after the Z's and enter the character you want to make searchable four times, separated by spaces. You must also begin with a space.

  6. Scroll down in the file to the next line of Z's.
  7. Repeat step 5 and save.
  8. Perform a full build on the dtSearch index. The characters you added are now included in your searches.

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