why not create a database per collection to overcome the write lock?

[Alon Horev]

Hi,

version 2.2 introduces a database-level write lock (instead of a global write lock). 

what are the disadvantages of creating a collection per database?

since there are no joins, All I could think of is easier administration.

         Thanks, Alon Horev

[Max Schireson]

You'd likely experience some increased storage requirements as the databases will have separate files for their extents. Sometimes people do this for heavily accessed collections and leave the less accessed ones together.

-- Max

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