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What takes up more space for search components; the index size on the file system or the property store DB?

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up vote 2 down vote accepted

Based on suggsted capacity planning guide, Index takes more space than property database:

Property Database - 1.5% of Content Database
Index - 3.5% of Content Database (single partition)

Again, there could be several IFs and BUTs, above guideline helps when you start planning. Check below (and there could be more on technet):

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Ashish Patel has good advise for capacity planning comparing property DB and the search Index size.

Also remember to consider the processing requirements an index services puts on a server when capacity planning and provisioning infrastructure.

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