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The value of variables in mongodb logs

Can someone explain to me about the logs in mongodb, how each variable in the logs is defined and what they mean?

2015-02-26T16: 05: 24.112 + 0100 [conn1359] command xxx. Command $ cmd: {fsync: false, j: false, w: 1}} keyUpdates: 0 numYields: 0 reslen: 55 4045ms

2015-02-26T16: 05: 24.114 + 0100 [conn1296] update xxx.users query: nscanned: 2015 nscannedObjects: 2015 nMatched: 1 nModified: 1 fastmod: 1 keyUpdates: 0 numbers: 15 locks (micro) w: 7292 4538ms

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Database Profiler Output MongoDB, , , , MongoDB .

FSYNC: - mongod .

keyUpdates: - , . , B-.

numYield: - , . , , , MongoDB . , , MongoDB .

responseLength (reslen): - . .

nscanned: - , MongoDB . , nscanned , nurrurned, . .

nMatched: - , . , . $set expression , nMatched nModified.

nModified: - . / , , nModified nMatched.

lockStats (): - , . :

R - global read lock
W - global write lock
r - database-specific read lock
w - database-specific write lock

timeLockedMicros: - . , , , oplog, , (.. .)

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