Server parameters

The parameters you read with getParameter, with their default and when you can change each one.

You read one parameter with db.adminCommand({getParameter: 1, cursorTimeoutMillis: 1}) and all of them with getParameter: "*". The ones that change at runtime take setParameter, with no restart of the node. The ones set at startup go in --setParameter name=value or in the setParameter key of the configuration file. The defaults are what getParameter: "*" returns on a node that has just started.

Parameter	Default	At runtime	At startup	What it is for
`auditAuthorizationSuccess`	false	Yes	Yes	With `true`, successful authorization checks go to the audit log too.
`authSchemaVersion`	5	No	No	The version of the schema of users and roles, which `mongodump` and `mongorestore` read. It cannot change.
`clientCursorMonitorFrequencySecs`	4	Yes	Yes	How often, in seconds, expired cursors and sessions are closed.
`clusterAuthMode`	undefined	Yes	No	How the nodes of the cluster authenticate to each other. It is set at startup with `--clusterAuthMode` and moves one step at a time at runtime.
`cursorTimeoutMillis`	600000	Yes	Yes	Idle milliseconds after which a cursor opened outside a session is closed.
`enableTestCommands`	false	No	Yes	Turns on the test commands, such as `configureFailPoint`. It is only set at startup.
`internalQueryMaxMemoryUsageBytesPerOperation`	1073741824 (1 GiB)	Yes	Yes	The memory the stages of one operation may hold. Past it a `$group` writes to disk, or fails with 292 without `allowDiskUse`.
`internalQueryMaxSingleExpressionMemoryUsageBytes`	104857600 (100 MiB)	Yes	Yes	The memory one constant expression may hold when it is computed ahead of time.
`internalQueryPlannerEnableHashIntersection`	false	Yes	Yes	Allows plans that intersect two indexes with a hash table (`AND_HASH`).
`internalQueryStatsRateLimit`	0	Yes	Yes	How many queries a second `$queryStats` counts when it does not sample. -1 counts all of them and 0 none.
`internalQueryStatsSampleRate`	0.01	Yes	Yes	The probability that `$queryStats` counts a query. With 0 the per-second limit applies.
`localLogicalSessionTimeoutMinutes`	30	No	Yes	Idle minutes after which a session is closed. It is only set at startup.
`maxConcurrentMultiDocumentTransactions`	10000	Yes	Yes	The client transactions a node keeps open at once. With 0 there is no limit.
`ocspEnabled`	true	No	Yes	Staples the OCSP response to the certificate of the server. It is only set at startup.
`ocspStaplingRefreshPeriodSecs`	-1	No	Yes	How often, in seconds, the stapled OCSP response is refreshed. With -1, halfway to its `nextUpdate`.
`ocspValidationRefreshPeriodSecs`	-1	No	Yes	How often, in seconds, a certificate is checked again over OCSP. With -1, by the `nextUpdate` of the response.
`redactClientLogData`	false	Yes	No	With `true`, the log hides the documents of the clients. At startup it is set with the `--redactClientLogData` option.
`tlsOCSPStaplingTimeoutSecs`	-1	No	Yes	Seconds to wait for the OCSP responder when stapling. With -1 it uses `tlsOCSPVerifyTimeoutSecs`.
`tlsOCSPVerifyTimeoutSecs`	4	No	Yes	Seconds to wait for the OCSP responder when checking a certificate.
`transactionLifetimeLimitSeconds`	60	Yes	Yes	Seconds a transaction may last before it is aborted.
`useInternalAuthzForX509`	false	Yes	Yes	Internal authorization for MONGODB-X509 users under LDAP authorization. It is kept and shown, but as on MongoDB Enterprise those users keep the roles of their LDAP groups.

Server parameters

See also