MongoDb aggregation 16MB buffer size limit

Question

I am trying to run mongo db aggregate query from c#, but buffer size is exceeding 16MB. Is there any way to adjust the buffer size or any other workaround. I do not have the option to create collection in mongo server side and also I do not have any mongo utility like mongo.exe or mongoExport.exe in my client system.

Answer 1

You can set AllowDiskUse and OutputMode in AggregateArgs to allow more than 16 MB.

 var mongoPipeline = new AggregateArgs { Pipeline = pipeline, AllowDiskUse = true, OutputMode = AggregateOutputMode.Cursor };
 var response = Repository.Collection.Aggregate(mongoPipeline)

See MongoDB Reference for more informations.