CosmosDB - Is there a way to get MongoDB API RequestCharge

Question

So, when using MongoDB API with C# driver against CosmosDB, can we somehow get RequestCharge from CosmosDB response for each query?

Answer 1

So, for anyone struggling with same thing, here is the solution.

Cosmos DB MongoDB API has dedicated command called: getLastRequestStatistics

ref: https://docs.microsoft.com/en-us/azure/cosmos-db/request-units

So, immediately after a real query is executed, one should trigger:

var result = this._db.RunCommand<BsonDocument>(new BsonDocument{{ "getLastRequestStatistics", 1 }});

And that will give actual response from Cosmos DB with real cost. Response looks like:

{
"_t" : "GetRequestStatisticsResponse", 
"ok" : 1, 
"CommandName" : "find", 
"RequestCharge" : 5.5499999999999998, 
"RequestDurationInMilliSeconds" : NumberLong(25) 
}