Toggle $queryStats Log Output

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About this Task

Steps
Examples
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MongoDB records $queryStats operations in the deployment logs. By default, MongoDB only logs the invocation of $queryStats operations, not the operation's output. For $queryStats operations that include the transformIdentifiers option, you can specify whether the transformed output is included in the log entry.

Including $queryStats output in the logs provides more information on specific $queryStats operations, but can negatively impact cluster performance as log updates take more time and resources.

About this Task

When MongoDB logs $queryStats output, the results are redacted and anonymized. $queryStats output does not contain literals or field values.

For an example of transformed $queryStats output, see Transformed Example.

Steps

Open the Database Deployments page for your project

Click Edit Config

Select your cluster from the dropdown

Open the Additional Settings dropdown

Open the More Configuration Options dropdown

Toggle the Enable Logging of Redacted and Anonymized Query Data setting

Click Review Changes

Click Apply Changes

Examples

The following examples show the differences in log messages when $queryStats output is included.

Note

The example log entries are reformatted for readability.

`$queryStats` Output Omitted (Default Behavior)

{
  "t":{"$date":"2023-11-27T20:58:59.212+00:00"},"s":"D1", "c":"QRYSTATS",
  "id":7808300, "ctx":"conn31","msg":"Logging invocation
  $queryStats","attr":{"commandSpec":{"transformIdentifiers":{"algorithm":"hmac-sha-256","hmacKey":"###"}}
}

`$queryStats` Output Included

{
  "t":{"$date":"2023-11-27T20:58:59.212+00:00"},"s":"D1", "c":"QRYSTATS",
  "id":7808300, "ctx":"conn31","msg":"Logging invocation
  $queryStats","attr":{"commandSpec":{"transformIdentifiers":{"algorithm":"hmac-sha-256","hmacKey":"###"}}
}
{
  "t":{"$date":"2023-11-27T20:58:59.212+00:00"},"s":"D3", "c":"QRYSTATS",
  "id":7808301, "ctx":"conn31","msg":"Logging all outputs of
  $queryStats","attr":{"thisOutput":"{key: {queryShape: {cmdNs: {db:
  \"hYt+nW/sr1/Zc3YR8nlGWFoesJdvywkw+cR9rMGzXU4=\", coll:
  \"TRx6R3rvstYgX96gNmeOi5E3QVsOqzRbv7A9j3q7OvM=\"}, command: \"find\",
  filter: {Wb/Uu22DzKZ/Os+ZvLgPKFKGZPV4cIMZ3Ybv1HfYih4=: {$lt:
  \"?date\"}}, projection: {r5zQZllsGoqQuQp4Jm0eH2M6RrMqH84KHowcFaiverg=:
  true}, sort: {r5zQZllsGoqQuQp4Jm0eH2M6RrMqH84KHowcFaiverg=: 1}},
  readConcern: {}, collectionType: \"nonExistent\"}, metrics:
  {lastExecutionMicros: 208, execCount: 21, totalExecMicros: {sum: 6079,
  max: 1875, min: 198, sumOfSquares: 4401645}, firstResponseExecMicros:
  {sum: 6079, max: 1875, min: 198, sumOfSquares: 4401645}, docsReturned:
  {sum: 0, max: 0, min: 0, sumOfSquares: 0}, firstSeenTimestamp:
  2023-11-27T19:15:51.317Z, latestSeenTimestamp:
  2023-11-27T20:55:51.309Z}, asOf: 2023-11-27T20:58:59.212Z}"}
}
{
  "t":{"$date":"2023-11-27T20:58:59.213+00:00"},"s":"D3", "c":"QRYSTATS",
  "id":7808301, "ctx":"conn31","msg":"Logging all outputs of
  $queryStats","attr":{"thisOutput":"{key: {queryShape: {cmdNs: {db:
  \"j+Caz+gxt7vl++gmeCAWrvyhDL17WaNrSIDi6Au7VI0=\", coll:
  \"f/LCkK/kVEbt4fk2NNbyDPhxas+kzCLLcVbjeNBbhyg=\"}, let:
  {pUZAyEEImSXcu8deG05tfIf6F/H92YsFnkZXIeRQtgc=: \"?number\"}, command:
  \"aggregate\", pipeline: [{$group: {_id: \"?number\",
  5E6FSc5VxCvIZK0jrqkY3k3aX51jSc73hQwO/8kH0lo=: {$sum: \"?number\"}}}],
  explain: true, allowDiskUse: false}, client: {driver: {name:
  \"nodejs|mongosh\", version: \"5.1.0\"}, os: {type: \"Darwin\", name:
  \"darwin\", architecture: \"arm64\", version: \"22.6.0\"}, platform:
  \"Node.js v16.19.1, LE (unified)\", version: \"5.1.0|1.8.0\",
  application: {name: \"mongosh 1.8.0\"}}, collectionType: \"collection\",
  cursor: {batchSize: \"?number\"}}, metrics: {lastExecutionMicros: 0,
  execCount: 1, totalExecMicros: {sum: 0, max: 0, min: 0, sumOfSquares:
  0}, firstResponseExecMicros: {sum: 0, max: 0, min: 0, sumOfSquares: 0},
  docsReturned: {sum: 0, max: 0, min: 0, sumOfSquares: 0},
  firstSeenTimestamp: 2023-11-27T19:31:36.463Z, latestSeenTimestamp:
  2023-11-27T19:31:36.463Z}, asOf: 2023-11-27T20:58:59.213Z}"}
}
// Additional $queryStats output...

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$queryStats

$redact