2015-09-22T04:53:10.248+0800 I QUERY    [conn1664530] query external.dianping query: { flag: { $ne: "d" }, data.poiid: { $in: [ "aaaaa", "xxxxx", "yyyyy" ] } } planSummary: IXSCAN { data.poiid: 1.0 } ntoreturn:0 ntoskip:0 nscanned:2 nscannedObjects:0 keyUpdates:0 writeConflicts:0 numYields:2 nreturned:0 reslen:20 locks:{ Global: { acquireCount: { r: 6 }, acquireWaitCount: { r: 1 }, timeAcquiringMicros: { r: 195093 } }, Database: { acquireCount: { r: 3 } }, Collection: { acquireCount: { r: 3 } } } 52ms

AutoGetCollectionForRead::AutoGetCollectionForRead(OperationContext* txn    ,
                                                        const std::string& ns    )
             : _txn(txn),
               _transaction(txn, MODE_IS),
               _db(_txn, nsToDatabaseSubstring(ns), MODE_IS),
               _collLock(_txn->lockState(), ns, MODE_IS),
               _coll(NULL) {
          _init(ns, nsToCollectionSubstring(ns));
 }