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# Optimize IDOL Content

There are many ways to optimize the content that you store in IDOL server. You can improve both index and query performance by using a stop word list, and configuring IDOL to not index numbers.

## Use a Stop Word List

A stop word list is a list of common words that do not convey much meaning to sentences. For example, in English, words such as the and that do not add extra meaning in a sentence.

By default, IDOL server does not index any stop words, and does not use them to search documents. This option reduces the number of terms that IDOL must index. It also means that IDOL server retrieves documents based only on the relevant terms in the query.

To optimize index and query performance, ensure that your stop word list includes all common words for your system.

## Index Numbers

You can determine how IDOL treats numbers when indexing documents. By default, IDOL does not index any numbers. This option reduces the number of terms that IDOL must index and search.

You can configure IDOL to index numbers, if you want users to be able to search for numeric terms. You can also configure IDOL to index numbers only if they occur in a mixed alphanumeric word (for example, IPv6).

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