[Couchdb Wiki] Update of "Compaction" by JanLehnardt

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The following page has been changed by JanLehnardt:
http://wiki.apache.org/couchdb/Compaction

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  The compact_running key will be set to true during compaction.
  
  === Compaction of write-heavy databases ===
- Note, it is not a good idea to attempt compaction on a database is near full capacity for its write load. The problem is the compaction process may never catch up with the writes if they never let up, and eventually it will run out of disk space.
+ Note, it is not a good idea to attempt compaction on a database node that is near full capacity for its write load. The problem is the compaction process may never catch up with the writes if they never let up, and eventually it will run out of disk space.
  
  Compaction should be attempted when the write load is less than full capacity. Read load won't affect its ability to complete however.
  CouchDB works like this to have the least impact possible on clients,  the database remains online and fully functional to readers and