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    ApsaraDB for MongoDB:MongoDB 7.0 parameters

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    ApsaraDB for MongoDB:MongoDB 7.0 parameters

    Last Updated:Oct 09, 2026

    This topic describes the parameters for ApsaraDB for MongoDB 7.0.

    Replica set

    Parameter

    Restart required

    Default

    Value range

    Minor version range

    Description

    Official documentation

    setParameter.internalDocumentSourceGroupMaxMemoryBytes

    No

    104857600

    [10485760-10485760000]

    Unlimited

    Specifies the maximum memory that the $group operator can use. Data that exceeds this limit spills to disk.

    Not public

    setParameter.timeseriesBucketMaxCount

    Yes

    1000

    [1-10000]

    Unlimited

    Specifies the maximum number of measurements per bucket in a time-series collection.

    Not public

    setParameter.timeseriesIdleBucketExpiryMemoryUsageThreshold

    No

    5

    [0-6710886400]

    Unlimited

    Specifies the memory usage threshold that triggers the expiration of idle buckets in a time-series collection. The default value is 5% of the available system memory.

    Not public

    setParameter.internalQueryMaxPushBytes

    No

    104857600

    [10485760-1048576000]

    Unlimited

    Specifies the maximum memory that the $push operator can use.

    Not public

    setParameter.internalQueryMaxAddToSetBytes

    No

    104857600

    [10485760-1048576000]

    Unlimited

    Specifies the maximum memory that the $addToSet operator can use.

    Not public

    setParameter.internalDocumentSourceCursorBatchSizeBytes

    No

    4194304

    [1048576-104857600]

    Unlimited

    Specifies the maximum amount of data in bytes that a DocumentSourceCursor caches from the underlying PlanExecutor before pipeline processing.

    Not public

    setParameter.internalQueryMaxBlockingSortMemoryUsageBytes

    No

    104857600

    [33554432-268435456]

    Unlimited

    Specifies the maximum amount of memory in bytes that a blocking sort operation can use. The default value is equivalent to 100 MB.

    Not public

    setParameter.internalQueryCacheMaxEntriesPerCollection

    No

    5000

    [0-5000]

    Unlimited

    Specifies the maximum number of query plan cache entries for a collection.

    Note

    This parameter applies only to the classic query engine, not the SBE query engine.

    Not public

    net.compression.compressors

    Yes

    snappy,zstd,zlib

    [snappy|zlib|zstd|snappy,zstd,zlib|disabled]

    Unlimited

    Specifies the network compression algorithm for mongod or mongos. If multiple compression algorithms are specified, they are listed in descending order of priority.

    net.compression.compressors

    operationProfiling.mode

    Yes

    off

    [off|slowOp|all]

    Unlimited

    Specifies the database profiler level.

    Note

    Enabling this parameter can degrade instance performance. Use this parameter with caution in a production environment.

    operationProfiling.mode

    operationProfiling.slowOpThresholdMs

    No

    100

    [0-65536]

    Unlimited

    Specifies the duration in milliseconds after which an operation is considered a slow operation.

    operationProfiling.slowOpThresholdMs

    replication.oplogGlobalIdEnabled

    Yes

    false

    [true|false]

    Unlimited

    Specifies whether to enable GID, which is required for two-way synchronization using DTS or mongoShake.

    Self-developed parameter.

    replication.oplogSizeMB

    No

    10%

    [1024-1073741824]

    Unlimited

    Specifies the maximum size of the oplog in MB. The default is 10% of the total disk size.

    replication.oplogSizeMB

    rsconf.writeConcernMajorityJournalDefault

    No

    true

    [true|false]

    Unlimited

    Specifies whether write operations with a majority write concern must also be committed to the journal.

    replSetGetConfig

    setParameter.cursorTimeoutMillis

    No

    600000

    [1-2147483647]

    Unlimited

    Specifies the time in milliseconds after which an idle cursor expires and is deleted by MongoDB.

    Attempting to access an expired cursor returns a cursor not found error.

    cursorTimeoutMillis

    setParameter.flowControlTargetLagSeconds

    No

    10

    [1-600]

    Unlimited

    Specifies the replication lag in seconds that triggers flow control. This mechanism prevents the majority commit point from lagging too far behind.

    flowControlTargetLagSeconds

    setParameter.maxTransactionLockRequestTimeoutMillis

    No

    5

    [0-60]

    Unlimited

    Specifies the timeout in milliseconds for a transaction to acquire a lock.

    maxTransactionLockRequestTimeoutMillis

    setParameter.oplogFetcherUsesExhaust

    Yes

    true

    [true|false]

    Unlimited

    Specifies whether to enable streaming replication. This feature is enabled by default.

    oplogFetcherUsesExhaust

    setParameter.replWriterThreadCount

    Yes

    16

    [1-256]

    Unlimited

    Specifies the maximum number of threads for parallel replication. The effective maximum number of threads is twice the number of instance CPU cores.

    replWriterThreadCount

    setParameter.tcmallocAggressiveMemoryDecommit

    No

    0

    [0|1]

    Unlimited

    Specifies whether to enable aggressive memory decommit for tcmalloc. This feature is disabled by default.

    tcmallocAggressiveMemoryDecommit

    setParameter.tcmallocReleaseRate

    No

    1

    [1-10]

    Unlimited

    Sets the rate at which tcmalloc releases memory to the operating system. A higher value results in a faster release rate.

    tcmallocReleaseRate

    setParameter.transactionLifetimeLimitSeconds

    No

    60

    [1-300]

    Unlimited

    Specifies the maximum lifetime of a transaction in seconds. Transactions that exceed this limit are aborted to reduce pressure on the WiredTiger cache.

    transactionLifetimeLimitSeconds

    storage.oplogMinRetentionHours

    No

    0

    [0.00-720.00]

    Unlimited

    Specifies the retention period in hours for oplog entries. The value can be a floating-point number.

    storage.oplogMinRetentionHours

    storage.wiredTiger.collectionConfig.blockCompressor

    Yes

    snappy

    [snappy|zlib|zstd|none]

    Unlimited

    Set the storage compression algorithm for collection data (this setting applies only to new tables). If you want to use different compression algorithms for different tables, you need to use an explicit createCollection command with the relevant options.

    storage.wiredTiger.collectionConfig.blockCompressor

    setParameter.minSnapshotHistoryWindowInSeconds

    No

    300

    [0-600]

    Unlimited

    Specifies the duration in seconds for which the WiredTiger storage engine retains snapshot history. A value of 0 disables this feature.

    minSnapshotHistoryWindowInSeconds

    rsconf.chainingAllowed

    No

    true

    [true|false]

    Unlimited

    Specifies whether to allow chained replication in the replica set.

    For example, data can be replicated from the primary to a secondary, which then replicates to a hidden member. Alternatively, a hidden member can replicate from the primary and then pass the data to another secondary.

    rsconf.chainingAllowed

    setParameter.periodicNoopIntervalSecs

    Yes

    10

    [1-10]

    Unlimited

    Specifies the interval in seconds for writing noop operations.

    periodicNoopIntervalSecs

    Sharded cluster (shard)

    Parameter

    Restart required

    Default

    Values

    Minor engine version

    Description

    Documentation

    setParameter.internalDocumentSourceGroupMaxMemoryBytes

    No

    104857600

    [10485760-10485760000]

    Unlimited

    Specifies the maximum memory in bytes that the $group operator can use. If this limit is exceeded, the excess data spills to disk.

    Not publicly available

    setParameter.timeseriesBucketMaxCount

    Yes

    1000

    [1-10000]

    Unlimited

    Specifies the maximum number of measurements that can be stored in a single bucket of a time series collection.

    Not publicly available

    setParameter.timeseriesIdleBucketExpiryMemoryUsageThreshold

    No

    5

    [0-6710886400]

    Unlimited

    Specifies the memory usage threshold for expiring idle buckets in a time series collection. The default value is 5% of the available system memory.

    Not publicly available

    setParameter.internalQueryMaxPushBytes

    No

    104857600

    [10485760-1048576000]

    Unlimited

    Specifies the maximum amount of memory in bytes that the $push operator can use.

    Not publicly available

    setParameter.internalQueryMaxAddToSetBytes

    No

    104857600

    [10485760-1048576000]

    Unlimited

    Specifies the maximum amount of memory in bytes that the $addToSet operator can use.

    Not publicly available

    setParameter.internalDocumentSourceCursorBatchSizeBytes

    No

    4194304

    [1048576-104857600]

    Unlimited

    Specifies the maximum data size in bytes that a DocumentSourceCursor can cache from the underlying PlanExecutor before pipeline processing begins.

    Not publicly available

    setParameter.internalQueryMaxBlockingSortMemoryUsageBytes

    No

    104857600

    [33554432-268435456]

    Unlimited

    Specifies the maximum amount of memory in bytes that a blocking sort stage can use during a query. The default value is 100 MB.

    Not publicly available

    setParameter.internalQueryCacheMaxEntriesPerCollection

    No

    5000

    [0-5000]

    Unlimited

    Specifies the maximum number of entries in the query plan cache for a single collection.

    Note

    This parameter applies only to the classic query engine, not the Slot-Based Execution (SBE) engine.

    Not publicly available

    net.compression.compressors

    Yes

    snappy,zstd,zlib

    [snappy|zlib|zstd|snappy,zstd,zlib|disabled]

    Unlimited

    Specifies the network compression algorithm for mongod or mongos instances. If you specify multiple algorithms, they are prioritized in descending order.

    net.compression.compressors

    operationProfiling.mode

    Yes

    off

    [off|slowOp|all]

    Unlimited

    Specifies the level for the query profiler.

    Note

    Enabling this parameter can degrade instance performance. Use this parameter with caution in a production environment.

    operationProfiling.mode

    operationProfiling.slowOpThresholdMs

    No

    100

    [0-65536]

    Unlimited

    Specifies the threshold in milliseconds for slow operations. Operations that take longer than this threshold are considered slow operations.

    operationProfiling.slowOpThresholdMs

    replication.oplogGlobalIdEnabled

    Yes

    false

    [true|false]

    Unlimited

    Specifies whether to enable Global IDs (GIDs) to support bidirectional synchronization for services like Data Transmission Service (DTS) or mongoShake.

    self-developed parameter

    replication.oplogSizeMB

    No

    10%

    [1024-1073741824]

    Unlimited

    Specifies the maximum size of the oplog in megabytes (MB). The default value is 10% of the total disk size.

    replication.oplogSizeMB

    rsconf.writeConcernMajorityJournalDefault

    No

    true

    [true|false]

    Unlimited

    Determines whether writes with a majority write concern require the journal to be persisted to disk.

    replSetGetConfig

    setParameter.cursorTimeoutMillis

    No

    600000

    [1-2147483647]

    Unlimited

    Specifies the expiration threshold in milliseconds for idle cursors.

    MongoDB automatically closes a cursor that remains idle longer than this threshold. Attempting to use a closed cursor causes a "cursor not found" error.

    cursorTimeoutMillis

    setParameter.flowControlTargetLagSeconds

    No

    10

    [1-600]

    Unlimited

    Specifies the threshold in seconds that triggers the flowControl mechanism. This mechanism keeps the majority commit point from falling too far behind.

    flowControlTargetLagSeconds

    setParameter.maxTransactionLockRequestTimeoutMillis

    No

    5

    [0-60]

    Unlimited

    Specifies the timeout in milliseconds for acquiring locks within a transaction.

    maxTransactionLockRequestTimeoutMillis

    setParameter.migrateCloneInsertionBatchSize

    No

    0

    [0-1000]

    Unlimited

    Specifies the maximum number of documents in a single batch during the cloning stage of a chunk migration. A value of 0 (the default) means the batch size is limited only by the 16 MB BSON document size limit.

    migrateCloneInsertionBatchSize

    setParameter.oplogFetcherUsesExhaust

    Yes

    true

    [true|false]

    Unlimited

    Specifies whether to enable streaming replication, which is enabled by default (true).

    oplogFetcherUsesExhaust

    setParameter.rangeDeleterBatchDelayMS

    No

    20

    [0-600000]

    Unlimited

    Specifies the delay in milliseconds between batch deletions during the cleanup stage of a chunk migration. This also affects thecleanupOrphaned command, which removes orphaned documents.

    rangeDeleterBatchDelayMS

    setParameter.rangeDeleterBatchSize

    No

    0

    [0-2147483647]

    Unlimited

    Specifies the maximum number of documents in a single batch for asynchronous deletions during the cleanup stage of a chunk migration. A value of 0 (the default) uses the kernel-preset batch size (equivalent to 2147483647, meaning no limit on the number of documents deleted per batch).

    rangeDeleterBatchSize

    setParameter.replWriterThreadCount

    Yes

    16

    [1-256]

    Unlimited

    Specifies the maximum number of threads for parallel replication. The effective maximum is twice the number of the instance's CPU cores.

    replWriterThreadCount

    setParameter.tcmallocAggressiveMemoryDecommit

    No

    0

    [0|1]

    Unlimited

    Specifies whether to enable aggressive memory decommitment for tcmalloc, which is disabled by default (0).

    tcmallocAggressiveMemoryDecommit

    setParameter.tcmallocReleaseRate

    No

    1

    [1-10]

    Unlimited

    Sets the rate at which tcmalloc releases memory back to the operating system. A higher value results in a faster release rate.

    tcmallocReleaseRate

    setParameter.transactionLifetimeLimitSeconds

    No

    60

    [1-300]

    Unlimited

    Specifies the lifetime of a transaction in seconds. The system aborts transactions that exceed this time limit to reduce pressure on the WiredTiger cache.

    transactionLifetimeLimitSeconds

    storage.oplogMinRetentionHours

    No

    0

    [0.00-720.00]

    Unlimited

    Specifies the minimum retention period in hours for oplog entries. Supports floating-point numbers.

    storage.oplogMinRetentionHours

    storage.wiredTiger.collectionConfig.blockCompressor

    Yes

    snappy

    [snappy|zlib|zstd|none]

    Unlimited

    Sets the default storage compression algorithm for collection data. This change affects only newly created collections. To use a different compression algorithm for a specific collection, use the explicitcreateCollection command with the appropriate options.

    storage.wiredTiger.collectionConfig.blockCompressor

    setParameter.receiveChunkWaitForRangeDeleterTimeoutMS

    No

    10000

    [10000-3600000]

    Unlimited

    Specifies the timeout in milliseconds to wait for the deletion of orphaned documents before a chunk migration begins.

    Not publicly available

    setParameter.minSnapshotHistoryWindowInSeconds

    No

    300

    [0-600]

    Unlimited

    Specifies the minimum duration in seconds that the WiredTiger engine retains snapshot history. A value of 0 disables history retention.

    minSnapshotHistoryWindowInSeconds

    rsconf.chainingAllowed

    No

    true

    [true|false]

    Unlimited

    Specifies whether chained replication is allowed in the shard.

    For example, a primary member replicates to a secondary member, which in turn replicates to a hidden member; or a primary member replicates to a hidden member, which then replicates to a secondary member.

    rsconf.chainingAllowed

    setParameter.periodicNoopIntervalSecs

    Yes

    10

    [1-10]

    Unlimited

    Specifies the interval in seconds for no-op writes.

    periodicNoopIntervalSecs

    Sharded cluster (mongos)

    Parameter

    Restart required

    Default

    Value

    Minor version

    Description

    Documentation

    setParameter.taskExecutorPoolSize

    Yes

    1

    [1-32]

    Base version 7.0.26 and later

    Specifies the number of TaskExecutor connection pools on a mongos instance.

    taskExecutorPoolSize

    setParameter.readHedgingMode

    No

    on

    [on|off]

    N/A

    Controls whether to enable Hedged Reads.

    readHedgingMode

    net.compression.compressors

    Yes

    snappy,zstd,zlib

    [snappy|zlib|zstd|snappy,zstd,zlib|disabled]

    N/A

    Specifies the network compression algorithm for mongod or mongos instances. If you specify multiple algorithms, they are prioritized in descending order.

    net.compression.compressors

    operationProfiling.slowOpThresholdMs

    No

    100

    [0-65536]

    N/A

    Specifies the threshold in milliseconds for slow operations. Operations exceeding this threshold are considered slow.

    operationProfiling.slowOpThresholdMs

    setParameter.cursorTimeoutMillis

    No

    600000

    [1-2147483647]

    N/A

    Specifies the expiration threshold in milliseconds for idle cursors. If a cursor remains idle for longer than this threshold, MongoDB automatically closes the cursor. Subsequent attempts to use the closed cursor result in a "cursor not found" error.

    cursorTimeoutMillis

    setParameter.ShardingTaskExecutorPoolHostTimeoutMS

    No

    300000

    [60000-3600000]

    N/A

    Specifies the timeout in milliseconds after which a mongos instance drops all connections in the TaskExecutor connection pool for a specific host.

    ShardingTaskExecutorPoolHostTimeoutMS

    setParameter.ShardingTaskExecutorPoolMaxConnecting

    No

    2

    [1-32]

    N/A

    Specifies the maximum number of concurrent connections that can be established when initializing the TaskExecutor connection pool for a sharded instance. This parameter controls the rate at which a mongos instance establishes connections to a mongod instance.

    ShardingTaskExecutorPoolMaxConnecting

    setParameter.ShardingTaskExecutorPoolMaxSize

    No

    32767

    [1-32767]

    N/A

    Specifies the maximum number of connections in each TaskExecutor connection pool for a sharded instance.

    ShardingTaskExecutorPoolMaxSize

    setParameter.ShardingTaskExecutorPoolMinSize

    No

    1

    [1-256]

    N/A

    Specifies the minimum number of connections in each TaskExecutor connection pool for a sharded instance.

    ShardingTaskExecutorPoolMinSize

    setParameter.ShardingTaskExecutorPoolRefreshRequirementMS

    No

    60000

    [30000-3600000]

    N/A

    Specifies the interval in milliseconds at which a mongos instance sends heartbeats to check idle connections in the TaskExecutor connection pool.

    ShardingTaskExecutorPoolRefreshRequirementMS

    setParameter.ShardingTaskExecutorPoolRefreshTimeoutMS

    No

    20000

    [5000-600000]

    N/A

    Specifies how long, in milliseconds, a mongos instance waits for a heartbeat response.

    ShardingTaskExecutorPoolRefreshTimeoutMS

    setParameter.tcmallocAggressiveMemoryDecommit

    No

    0

    [0|1]

    N/A

    Controls whether to enable aggressive memory decommit for tcmalloc. A value of 0 (the default) disables this feature.

    tcmallocAggressiveMemoryDecommit

    setParameter.tcmallocReleaseRate

    No

    1

    [1-10]

    N/A

    Sets the rate at which tcmalloc releases memory back to the operating system. A higher value indicates a faster release rate.

    tcmallocReleaseRate

    Sharded cluster (ConfigServer)

    Parameter

    Requires restart

    Default

    Value

    Minor version

    Description

    Documentation

    net.compression.compressors

    Yes

    snappy,zstd,zlib

    [snappy|zlib|zstd|snappy,zstd,zlib|disabled]

    N/A

    Sets the network compression algorithms for mongod or mongos. The algorithms are applied in the order listed.

    net.compression.compressors

    operationProfiling.mode

    Yes

    off

    [off|slowOp|all]

    N/A

    Sets the mode for the query profiler.

    Note

    Enabling this parameter can degrade instance performance. Use this parameter with caution in a production environment.

    operationProfiling.mode

    operationProfiling.slowOpThresholdMs

    No

    100

    [0-65536]

    N/A

    Sets the threshold in milliseconds that defines a slow operation.

    operationProfiling.slowOpThresholdMs

    replication.oplogGlobalIdEnabled

    Yes

    false

    [true|false]

    N/A

    Controls whether to enable GID, which is required for two-way synchronization with services like Data Transmission Service (DTS) or mongoShake.

    self-developed parameter

    replication.oplogSizeMB

    No

    10%

    [1024-1073741824]

    N/A

    The maximum size of the oplog collection in MB. The default value is 10% of the total disk size.

    replication.oplogSizeMB

    setParameter.cursorTimeoutMillis

    No

    600000

    [1-2147483647]

    N/A

    The expiration threshold in milliseconds for an idle cursor. If a cursor remains idle for longer than this threshold, MongoDB automatically closes the cursor. Subsequent attempts to use the closed cursor result in a "cursor not found" error.

    cursorTimeoutMillis

    setParameter.flowControlTargetLagSeconds

    No

    10

    [1-600]

    N/A

    The threshold in seconds that triggers the flow control mechanism. Flow control is used to ensure that the majority commit point does not fall too far behind.

    flowControlTargetLagSeconds

    setParameter.maxTransactionLockRequestTimeoutMillis

    No

    5

    [0-60]

    N/A

    The time in milliseconds a transaction will wait to acquire a lock before timing out.

    maxTransactionLockRequestTimeoutMillis

    setParameter.oplogFetcherUsesExhaust

    Yes

    true

    [true|false]

    N/A

    Enables or disables streaming replication.

    oplogFetcherUsesExhaust

    setParameter.replWriterThreadCount

    Yes

    16

    [1-256]

    N/A

    The maximum number of threads for parallel replication in primary-secondary synchronization. The effective maximum number of threads is twice the number of the instance's CPU cores.

    replWriterThreadCount

    setParameter.tcmallocAggressiveMemoryDecommit

    No

    0

    [0|1]

    N/A

    Enables or disables aggressive memory decommit for tcmalloc.

    tcmallocAggressiveMemoryDecommit

    setParameter.tcmallocReleaseRate

    No

    1

    [1-10]

    N/A

    The rate at which tcmalloc releases memory to the OS. A higher value means a faster rate.

    tcmallocReleaseRate

    setParameter.transactionLifetimeLimitSeconds

    No

    60

    [1-300]

    N/A

    The lifetime of a transaction in seconds. A transaction that runs longer than this limit is aborted to relieve pressure on the WT cache.

    transactionLifetimeLimitSeconds

    storage.wiredTiger.collectionConfig.blockCompressor

    Yes

    snappy

    [snappy|zlib|zstd|none]

    N/A

    Sets the default storage compression algorithm for newly created collections. This change does not affect existing collections. To use different compression algorithms for different collections, you must explicitly run the createCollection command with related options.

    storage.wiredTiger.collectionConfig.blockCompressor