Running an $OR query with a large number of attributes queried, like the one below, cause a c++ error ' Uncaught std::exception: bad allocation, terminating'. I have seen this error with as few as 15 and as many as 300 queried $OR attributes. This is using the 10GEN c# driver to create the query. Below is the output from the mongod log. In some cases the last thing logged on the connection will be 'running multiple plans', but not in all cases. In the case below this is the exact output from the server with nothing filtered.

Mon Dec 27 19:14:52 [conn1] run command BtSearchCache.$cmd { count: "Board_12", query: { g:

{ $lte: 200000 }

, RN:

{ $ne: 1 }

, CL:

{ $ne: 1 }

, $or: [

{ c: "2362" }

,

{ c: "2343" }

,

{ c: "2333" }

,

{ c: "2388" }

,

{ c: "2302" }

,

{ c: "2353" }

,

{ c: "1561" }

,

{ c: "2312" }

,

{ c: "2280" }

,

{ c: "1438" }

,

{ c: "2255" }

,

{ c: "2254" }

,

{ c: "1435" }

,

{ c: "1407" }

,

{ c: "2262" }

,

{ c: "1356" }

,

{ c: "2326" }

,

{ c: "2278" }

,

{ c: "2275" }

,

{ c: "2351" }

,

{ c: "2417" }

,

{ c: "1484" }

,

{ c: "2266" }

,

{ c: "41397" }

,

{ c: "2299" }

,

{ c: "2334" }

,

{ c: "1276" }

,

{ c: "41396" }

,

{ c: "2354" }

,

{ c: "2235" }

,

{ c: "2233" }

,

{ c: "1363" }

,

{ c: "2425" }

,

{ c: "2376" }

,

{ c: "2366" }

,

{ c: "2258" }

,

{ c: "1453" }

,

{ c: "1475" }

,

{ c: "2358" }

,

{ c: "1434" }

,

{ c: "1476" }

,

{ c: "2345" }

,

{ c: "1402" }

,

{ c: "2405" }

,

{ c: "2315" }

,

{ c: "2323" }

,

{ c: "2399" }

,

{ c: "2301" }

,

{ c: "1334" }

,

{ c: "1416" }

,

{ c: "2328" }

,

{ c: "2270" }

,

{ c: "2352" }

] } }
Mon Dec 27 19:15:08 [conn2] Uncaught std::exception: bad allocation, terminating
Mon Dec 27 19:15:08 dbexit:
Mon Dec 27 19:15:08 [conn2] shutdown: going to close listening sockets...
Mon Dec 27 19:15:08 [conn2] closing listening socket: 224
Mon Dec 27 19:15:08 [conn2] closing listening socket: 228
Mon Dec 27 19:15:08 [conn2] closing listening socket: 240
Mon Dec 27 19:15:08 [conn2] closing listening socket: 244
Mon Dec 27 19:15:08 [conn2] shutdown: going to flush oplog...
Mon Dec 27 19:15:08 [conn2] shutdown: going to close sockets...
Mon Dec 27 19:15:08 [conn2] shutdown: waiting for fs preallocator...
Mon Dec 27 19:15:08 [conn2] shutdown: closing all files...
Mon Dec 27 19:15:08 [conn4] MessagingPort recv() errno:10053 An established connection was aborted by the software in your host machine. 192.168.100.187:62638
Mon Dec 27 19:15:08 [conn4] SocketException: 9001 socket exception
Mon Dec 27 19:15:08 [conn4] end connection 192.168.100.187:62638
Mon Dec 27 19:15:08 [conn3] MessagingPort recv() errno:10053 An established connection was aborted by the software in your host machine. 192.168.100.187:62627
Mon Dec 27 19:15:08 [conn3] SocketException: 9001 socket exception
Mon Dec 27 19:15:08 [conn3] end connection 192.168.100.187:62627
Mon Dec 27 19:15:08 closeAllFiles() finished