Aws Dynamodb

DynamoDB is the AWS-native NoSQL database — designed for single-digit millisecond read/write latency at virtually unlimited scale. The table/partition key/sort key data model requires upfront access pattern design, but rewards teams with predictable performance. For agents: PutItem to write, GetItem for key lookups, Query for partition key + sort key range queries, Scan for full-table operations (use sparingly). Transactions (TransactWrite) for multi-item atomicity. DynamoDB Streams enable event-driven reactions to data changes. Confidence is docs-derived.

AWS SDK (boto3): ddb = boto3.resource("dynamodb"). table = ddb.Table("MyTable"). table.put_item(Item={"pk": "user#123", "sk": "profile", "name": "Alice", "email": "a@b.com"}). table.get_item(Key={"pk": "user#123", "sk": "profile"})["Item"]. table.query(KeyConditionExpression=Key("pk").eq("user#123") & Key("sk").begins_with("order#")). Transactions: ddb.meta.client.transact_write(TransactItems=[{Put: ...}, {Update: ...}]). Conditional writes: ConditionExpression=Attr("version").eq(1).

IAM auth: AWS credentials. Per-operation permissions: dynamodb:PutItem, dynamodb:GetItem, dynamodb:Query, dynamodb:Scan, dynamodb:TransactWrite per table. Resource-level policies for cross-account access. Encryption at rest enabled by default (SSE-AES256 or KMS). VPC endpoints for private access. HTTPS enforced.

ProvisionedThroughputExceededException (on-demand mode eliminates this; provisioned mode requires capacity planning). TransactionConflictException: retry with exponential backoff. ConditionalCheckFailedException: handle in update/delete logic. Hot partition issue: design partition keys to distribute load. DynamoDB SLA: 99.999% for single-region; global tables add 99.99% per-region. Scans are expensive on large tables — design for Query patterns.

docs.aws.amazon.com/dynamodb is comprehensive — developer guide, API reference, best practices for data modeling, global tables, streams, and DynamoDB Local for local development. Getting started: create table via console/CLI, boto3 PutItem in under 5 minutes. Free tier: 25 GB storage + 25 WCU + 25 RCU/month. DynamoDB Local for offline development. Community via AWS Forums and DynamoDB-specific tutorials.