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Allows you to store multiple items with the same partition key.All items with the same Partition key are stored together, then sorted according to the Sort key value.2 items may have the same Partition key, but they must have a different Sort key.Partition key would be the user ID, Sort key would be the timestamp of the post. The image below depicts a table with a partition key:Ĭomposite key – Partition key + Sort key in combination. If you are using the Partition key as your Primary key, then no two items can have the same partition key.Value of the Partition key is input to an internal hash function which determines the partition or physical location on which the data is stored.If an existing partition fills to capacity and more storage space is required.ĭynamoDB stores and retrieves data based on a Primary key.If you increase the table’s provisioned throughput settings beyond what the existing partitions can support.Partition management is handled entirely by DynamoDB-you never have to manage partitions yourself.ĭynamoDB allocates sufficient partitions to your table so that it can handle your provisioned throughput requirements.ĭynamoDB allocates additional partitions to a table in the following situations: Resource TypeĪrn:aws:dynamodb:region:account-id:table:table/name-nameĪrn:aws:dynamodb:region:account-id:table:table/name-name/index/index-nameĪrn:aws:dynamodb:region:account-id:table:table/name-name/stream/stream-labelĪmazon DynamoDB stores data in partitions.Ī partition is an allocation of storage for a table that is automatically replicated across multiple AZs within an AWS Region. These resources and subresources have unique Amazon Resource Names (ARNs) associated with them, as shown in the following table. You can create indexes and streams only in the context of an existing DynamoDB table (subresources). In DynamoDB, the primary resources are tables.ĭynamoDB also supports additional resource types, indexes, and streams. You can use a special IAM condition to restrict user access to only their own records. Attach a permissions policy to a role (grant cross-account permissions).ĭynamoDB doesn’t support resource-based policies.Attach a permissions policy to a user or a group in your account.Point-in-time recovery down to the second in last 35 days On-demand backup and restoreįully managed multi-region, multi-master solutionĪmazon DynamoDB is not ideal for the following situations:Īll authentication and access control is managed using IAM.ĭynamoDB supports identity-based policies: Strongly consistent or eventually consistent reads, support for ACID transactions Often used with Lambda and the Kinesis Client Library (KCL).įully managed in-memory cache for DynamoDB that increases performance (microsecond latency) Seamless scalability to any scale with push button scaling or Auto scalingĬaptures a time-ordered sequence of item-level modifications in a DynamoDB table and durably stores the information for 24 hours. NoSQL type of database with Name / Value structureįlexible Schema, good for when data is not well structured or unpredictable Some of the features and benefits of Amazon DynamoDB are summarized in the following table: DynamoDB Featureĩ9.99% Availability SLA – 99.999% for Global tables Key = the name of the data Value = the data itself.ĭocuments can be written in JSON, HTML, or XML. Supports key value and document structures.Ī key-value database stores data as a collection of key-value pairs in which a key serves as a unique identifier.
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The aggregate size of an item cannot exceed 400KB including keys and all attributes.Ĭan store pointers to objects in S3, including items over 400KB. Tables are a collection of items and items are made up of attributes (columns).Īttributes consists of a name and a value or set of values.Īttributes in DynamoDB are like fields or columns in other database systems. The underlying hardware storing data is spread across 3 geographically distinct data centers. Multi-AZ redundancy and Cross-Region Replication option. Push button scaling means that you can scale the DB at any time without incurring downtime.ĭynamoDB can be used for storing session state data. It is a non-relational, key-value type of database.ĭynamoDB is a serverless service – there are no instances to provision or manage. Home » AWS Cheat Sheets » AWS Database » Amazon DynamoDBĪmazon DynamoDB is a fully managed NoSQL database service that provides fast and predictable performance with seamless scalability.Īmazon DynamoDB stores three geographically distributed replicas of each table to enable high availability and data durability.ĭata is synchronously replicated across 3 facilities (AZs) in a region.