> For the complete MongoDB documentation index, see www.mongodb.com/docs/llms.txt # Determine Status of Queries Against Federated Database Instances You can determine the status of a running query using [$currentOp](https://www.mongodb.com/docs/manual/reference/operator/aggregation/currentOp.md#std-label-current-op-agg) (aggregation). To run `$currentOp`, use the [`db.aggregate()`](https://www.mongodb.com/docs/manual/reference/method/db.aggregate.md#mongodb-method-db.aggregate) helper. **Note:** If you are an Admin user, you can view all queries using the [`$currentOp`](https://www.mongodb.com/docs/manual/reference/operator/aggregation/currentOp.md#mongodb-pipeline-pipe.-currentOp) `allUsers` option. [$currentOp](https://www.mongodb.com/docs/manual/reference/operator/aggregation/currentOp.md#std-label-current-op-agg) must be run against the `admin` database. **Note:** If your aggregation pipeline only contains the [$currentOp](https://www.mongodb.com/docs/atlas/data-federation/admin/determine-query-status.md#std-label-determine-query-status) stage, Atlas Data Federation doesn't enforce the limit on the maximum number of simultaneous queries. You can run queries that only contain the [$currentOp](https://www.mongodb.com/docs/atlas/data-federation/admin/determine-query-status.md#std-label-determine-query-status) stage even after you reach the maximum number of simultaneous queries. ## Syntax ```json db.aggregate([{$currentOp: {} }]) ``` ## Output [$currentOp](https://www.mongodb.com/docs/manual/reference/operator/aggregation/currentOp.md#std-label-current-op-agg) returns documents with the following fields: | Field | Type | Description | | --- | --- | --- | | `$currentOp.type` | string | Type of operation. Value is always `op`. | | `$currentOp.opid` | [ObjectId](https://www.mongodb.com/docs/manual/reference/bson-types.md#std-label-objectid) | Unique identifier of the operation in [ObjectId](https://www.mongodb.com/docs/manual/reference/bson-types.md#std-label-objectid) format. The field value is the same as the `correlationID` that you can see in errors and logs. | | `$currentOp.client` | string | IP address (or hostname) and the ephemeral port of the client connection where the operation originates. | | `$currentOp.clientMetadata` | Document | Additional client information such as the client: Application name; Driver name and version; Operating system name, type, architecture, and version | | `$currentOp.active` | boolean | Specifies whether the operation has started. Value is `true` if the operation has started or completed and `false` if the operation is idle. | | `$currentOp.currentOpTime` | [ISODate](https://www.mongodb.com/docs/manual/reference/glossary.md#std-term-ISODate) | Start time of the operation. | | `$currentOp.ns` | string | [Namespace](https://www.mongodb.com/docs/manual/reference/glossary.md#std-term-namespace) that the operation targets. A namespace consists of the database name and the collection name concatenated with a dot (`.`); that is, `"."`. | | `$currentOp.command` | Document | A document containing the [command](https://www.mongodb.com/docs/manual/reference/command.md#std-label-database-commands) object associated with this operation. | | `$currentOp.msg` | string | A message that describes the status and progress of the operation. | | `$currentOp.progress` | Document | A document that contains the amount of work done for the operation. | | `$currentOp.progress.workDone` | integer | A number that increases as documents move through the pipeline, indicating that progress has been made toward the completion of the query. This number is not a percentage and cannot be used to estimate how much work remains. | ## Examples For the example below, suppose one of the following queries is running on the `airbnb` collection in the `sample` database described in the [Get Started tutorial.](https://www.mongodb.com/docs/atlas/data-federation/tutorial/run-queries-sample-data.md#std-label-gst-run-queries) ### find Command ```json db.airbnb.find( { "address.market" : "Porto", "review_scores.review_scores_rating": {$gt: 79}}).comment("Find properties in Porto") ``` The following example returns information on the previous query running on the `airbnb` collection in the `sample` database: ```json db.aggregate([{$currentOp: {} }]) ``` [$currentOp](https://www.mongodb.com/docs/manual/reference/operator/aggregation/currentOp.md#std-label-current-op-agg) returns the following documents. The `workDone` field shows that 770 documents had been processed at the time that `$currentOp` was run. ```json { "type" : "op", "opid" : ObjectId("1635fa35bf73f4320c6f99d0"), "client" : "73.231.201.205:62351", "clientMetadata" : { "application" : { "name" : "MongoDB Shell" }, "driver" : { "name" : "MongoDB Internal Client", "version" : "4.2.0" }, "os" : { "type" : "Darwin", "name" : "Mac OS X", "architecture" : "x86_64", "version" : "18.7.0" } }, "active" : true, "currentOpTime" : ISODate("2020-03-26T12:51:43.291Z"), "ns" : "sample.airbnb", "command" : { "find" : "airbnb", "filter" : { "address.market" : "Porto", "review_scores.review_scores_rating" : { "$gt" : 79 } }, "comment" : "Find properties in Porto", "lsid" : { "id" : UUID("2211f8ac-56b2-4ba4-bb0c-2e5dd5b7cc21") }, "$db" : "sample" }, "msg" : "work done: 770", "progress" : { "workDone" : 770 } } { "type" : "op", "client" : "73.231.201.205:62353", "clientMetadata" : { "application" : { "name" : "MongoDB Shell" }, "driver" : { "name" : "MongoDB Internal Client", "version" : "4.2.0" }, "os" : { "type" : "Darwin", "name" : "Mac OS X", "architecture" : "x86_64", "version" : "18.7.0" } }, "active" : true, "currentOpTime" : ISODate("2020-03-26T12:51:47.380Z"), "ns" : "admin.$cmd.aggregate", "command" : { "aggregate" : 1, "pipeline" : [ { "$currentOp" : { } } ], "cursor" : { }, "lsid" : { "id" : UUID("045ea383-65d7-4e88-a989-37b7a8da23bc") }, "$db" : "admin" }, "msg" : "work done: 0", "progress" : { "workDone" : 0 } } ```