Amazon DocumentDB Quotas and Limits

    For certain management features, Amazon DocumentDB uses operational technology that is shared with Amazon Relational Database Service (Amazon RDS) and Amazon Neptune.

    Amazon DocumentDB supports on-demand instances and the following instance types:

    • Memory Optimized:

      • R5 instance types: , db.r5.2xlarge, db.r5.4xlarge, db.r5.12xlarge, db.r5.24xlarge.

      • R4 instance types: db.r4.large, db.r4.2xlarge, db.r4.4xlarge, db.r4.8xlarge, db.r4.16xlarge.

    • Burstable Performance:

    For more information on the supported instance types and their specifications, see Instance Class Specifications .

    Supported Regions

    Amazon DocumentDB is available in the following AWS regions:

    For certain management features, Amazon DocumentDB uses operational technology that is shared with Amazon Relational Database Service (Amazon RDS) and Amazon Neptune. The following table contains regional limits that are shared among Amazon DocumentDB, Amazon RDS, and Neptune.

    The following limits are per AWS account per region.

    ResourceAWS Default Limit
    Clusters40
    Cluster parameter groups50
    Event subscriptions20
    Instances40
    Manual cluster snapshots100
    Read replicas per cluster15
    Subnet groups50
    Subnets per subnet group20
    Tags per resource50
    VPC security groups per instance5

    You can use Service Quotas to request an increase for a quota, if the quota is adjustable. Some requests are automatically resolved, while others are submitted to AWS Support. You can track the status of a quota increase request that is submitted to AWS Support. Requests to increase service quotas do not receive priority support. If you have an urgent request, please contact AWS Support. For more information on Service Quotas, see

    To request a quota increase for Amazon DocumentDB:

    1. Open the Service Quotas console at https://console.aws.amazon.com/servicequotas and, if necessary, sign in.

    2. In the navigation pane, choose AWS services.

    3. Select Amazon DocumentDB from the list, or type Amazon DocumentDB in the search field.

    5. For Change quota value, enter the new value. The new value must be greater than the current value.

    6. Choose Request. After the request is resolved, the Applied quota value for the quota is set to the new value.

    7. To view any pending or recently resolved requests, choose Dashboard from the navigation pane. For pending requests, choose the status of the request to open the request receipt. The initial status of a request is Pending. After the status changes to Quota requested, you’ll see the case number with AWS Support. Choose the case number to open the ticket for your request.

    Aggregation Limits

    The following table describes aggregation limits in Amazon DocumentDB.

    The following table describes Amazon DocumentDB cluster limits.

    ResourceLimit
    Cluster size (sum of all collections and indexes)64 TB
    Collection size
 (sum of all collections can’t exceed cluster limit) – does not include the index size32 TB
    Collections per cluster100,000
    Databases per cluster100,000
    Database size (sum of all databases can’t exceed cluster limit)64 TB
    Document nesting depth100 levels
    Document size16 MB
    Index key size2,048 bytes
    Indexes per collection64
    Keys in a compound index32
    Maximum number of writes in a single batch command100,000
    Number of users per cluster1000

    Instance Limits

    The following table describes Amazon DocumentDB limits per instance.

    The following table describes naming constraints in Amazon DocumentDB.

    ResourceDefault Limit
    Cluster identifier

    • Length is [1–63] letters, numbers, or hyphens.

    • First character must be a letter.

    • Cannot end with a hyphen or contain two consecutive hyphens.

    • Must be unique for all clusters (across Amazon RDS, Amazon Neptune, and Amazon DocumentDB) per AWS account, per Region.

    Collection name: <col>

    Length is [1–57] characters.

    Database name: <db>

    Length is [1–63] characters.

    Fully qualified collection name: <db>.<col>Length is [3–120] characters.
    Fully qualified index name: <db>.<col>.$<index>Length is [6–127] characters.
    Index name: <col>$<index>

    Length is [3–63] characters.

    Instance identifier

    • Length is [1–63] letters, numbers, or hyphens

    • Cannot end with a hyphen or contain two consecutive hyphens

    • Must be unique for all instances (across Amazon RDS, Amazon Neptune, and Amazon DocumentDB) per AWS account, per Region.

    Master password

    • Length is [8-100] printable ASCII characters.

    • Can use any printable ASCII characters except for the following:

      • / (forward slash)

      • “ (double quotation mark)

      • @ (at symbol)

    Master user name

    • Length is [1-63] alphanumeric characters.

    • First character must be a letter.

    • Cannot be a word reserved by the database engine.

    Parameter group name

    • Length is [1–255] alphanumeric characters.

    • First character must be a letter.

    TTL Constraints