424       mem->Ref();  in RecoverLogFile()
471         mem_->Ref();  in RecoverLogFile()
541   base->Ref();  in CompactMemTable()
1077   mem_->Ref();  in NewInternalIterator()
1080     imm_->Ref();  in NewInternalIterator()
1085   versions_->current()->Ref();  in NewInternalIterator()
1124   mem->Ref();  in Get()
1125   if (imm != NULL) imm->Ref();  in Get()
1126   current->Ref();  in Get()
1373       mem_->Ref();  in MakeRoomForWrite()
1455     versions_->current()->Ref();  in GetApproximateSizes()
1512       impl->mem_->Ref();  in Open()