5. The method of claim 1 , wherein the first query distribution comprises a volume of the instances of the first query per unit of time over a time period.
1. A method of determining query similarity, comprising: logging instances of a first query; logging instances of a second query; deriving a first query distribution using the logged instances of the first query; deriving a second query distribution using the logged instances of the second query; comparing the first and second query distributions, where comparing the first and second query distributions comprises: determining a distance measure between the first query distribution and the second query distribution; comparing the distance measure to a specified threshold; and designating the second query as similar to the first query if the distance measure is below the specified threshold; and determining whether the second query is similar to the first query based on the comparison.