如何在pyMongo中使用allowDiskUse选项？

Question

I am getting following error when I am using 'Sort' operation in pyMongo :

OperationFailure: Executor error during find command: OperationFailed: Sort operation used more than the maximum 33554432 bytes of RAM. Add an index, or specify a smaller limit. // Werkzeug Debugger

I can not limit the number of records.

Please suggest me a way around. TIA

Answer 1

db.example.aggregate(
   [
     {$match : {key : matchvalue }},
     {$sort : {sortkey : -1/1}}
   ],
   {
       allowDiskUse: true // creates temp files if sort limit(100 MB) exceeds
   } 
);

This might be helpful. Its good to use the aggregate pipeline for this kind of tasks as MongoDB provides many operators.