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I have to index a rather large amount of data with Windows Search, so I wanted to have an estimation of index size. I've indexed a subset of data (about 60GB; 13e6 pages of text data each about 4-5KB).

The index has grown to about 78GB, so it now occupies more space than the data itself. These results contradict what I've read here:

The average size of an index is about 10% of the size of all the content that is being indexed.

Is this the expected size of the index? What can be done to reduce it?

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migrated from Aug 16 '11 at 4:47

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Average index size is not indicative of what yours would be. This is probably because in addition to all of your files getting indexed (and that would be large already as a size percentage as your files are all small) the content of text files also gets indexed, further increasing the size of the index.

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"The average size of an index is about 10% of the size of all the content that is being indexed." --> "the content of text files also gets indexed" --> ? – Mehrdad Aug 16 '11 at 6:31
Yes. For some file types. This allows you to search for text in the files. – soandos Aug 16 '11 at 6:32
Content is indexed. I think that estimate about 10% of original content assumes that content is indexed. Otherwise if index depended only on file properties it could not depend on content size. – Vladimir Nesterovsky Aug 16 '11 at 8:05

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