# DynamoDB operations 21 of 28 listed operations are implemented. Back to [DynamoDB](/docs/services/dynamodb/index.md). ## Summary | Category | ✅ Supported | ❌ Unsupported | | --- | --- | --- | | Table management | 7 | 1 | | Item operations | 6 | | | Query & scan | 2 | | | Transactions | 2 | | | Tags | 3 | | | Streams interoperability | 1 | | | Global tables | | 6 | --- ## Endpoints ### Table management | Operation | Status | Notes | AWS Docs | | --- | --- | --- | --- | | `CreateTable` | ✅ Supported | Includes GSI/LSI definitions; an omitted `BillingMode` defaults to `PROVISIONED`, which requires `ProvisionedThroughput` on the table and on every GSI, while `PAY_PER_REQUEST` rejects it | [docs](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_CreateTable.html) | | `DeleteTable` | ✅ Supported | | [docs](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_DeleteTable.html) | | `DescribeTable` | ✅ Supported | | [docs](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_DescribeTable.html) | | `ListTables` | ✅ Supported | Region-scoped — lists only tables in the request's region; Limit (default/max 100) and ExclusiveStartTableName honored; LastEvaluatedTableName echoed when more tables remain | [docs](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_ListTables.html) | | `UpdateTable` | ✅ Supported | BillingMode, ProvisionedThroughput, GSI create/delete/update-throughput, AttributeDefinitions, StreamSpecification | [docs](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_UpdateTable.html) | | `DescribeTimeToLive` | ✅ Supported | Reports all four `TimeToLiveStatus` values — a change is `ENABLING`/`DISABLING` until it settles; `AttributeName` is omitted only once the table has settled on `DISABLED` | [docs](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_DescribeTimeToLive.html) | | `UpdateTimeToLive` | ✅ Supported | TTL-based item expiry, with the sweeper deleting expired items hourly once the status reaches `ENABLED`; the change is asynchronous as on AWS, and both members of `TimeToLiveSpecification` are required (`AttributeName` 1..255). A second `UpdateTimeToLive` inside the transition window, re-enabling an `ENABLED` table (renaming the attribute included) and disabling a `DISABLED` one are each a `ValidationException`, so the attribute name only changes by disabling first. Overcast settles in 30 seconds where AWS takes up to an hour | [docs](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_UpdateTimeToLive.html) | | `RestoreTableFromBackup` | ❌ Unsupported | | [docs](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_RestoreTableFromBackup.html) | ### Item operations | Operation | Status | Notes | AWS Docs | | --- | --- | --- | --- | | `PutItem` | ✅ Supported | Includes `ConditionExpression`, `ReturnValues` (`ALL_OLD`); key attributes must be present and carry their declared `AttributeDefinitions` type, while non-key attributes stay schemaless; records AWS/DynamoDB CloudWatch metrics SuccessfulRequestLatency, ConsumedWriteCapacityUnits, UserErrors/SystemErrors; a reserved word used as a bare attribute name in an expression is rejected, as AWS does — reach it through `ExpressionAttributeNames` | [docs](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_PutItem.html) | | `GetItem` | ✅ Supported | Includes `ProjectionExpression`; a `Key` must name exactly the key schema's attributes with their declared types; records SuccessfulRequestLatency, ConsumedReadCapacityUnits, UserErrors/SystemErrors; a reserved word used as a bare attribute name in an expression is rejected, as AWS does — reach it through `ExpressionAttributeNames` | [docs](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_GetItem.html) | | `UpdateItem` | ✅ Supported | SET/REMOVE/ADD/DELETE clauses; all `ReturnValues` variants; upsert; a `Key` must name exactly the key schema's attributes with their declared types; records SuccessfulRequestLatency, ConsumedWriteCapacityUnits, UserErrors/SystemErrors; a reserved word used as a bare attribute name in an expression is rejected, as AWS does — reach it through `ExpressionAttributeNames` | [docs](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_UpdateItem.html) | | `DeleteItem` | ✅ Supported | `ConditionExpression`, `ReturnValues` (`ALL_OLD`); a `Key` must name exactly the key schema's attributes with their declared types; records SuccessfulRequestLatency, ConsumedWriteCapacityUnits, UserErrors/SystemErrors; a reserved word used as a bare attribute name in an expression is rejected, as AWS does — reach it through `ExpressionAttributeNames` | [docs](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_DeleteItem.html) | | `BatchGetItem` | ✅ Supported | Up to 100 items across tables; every key is checked against its table's key schema before any read; records SuccessfulRequestLatency/ConsumedReadCapacityUnits per table touched | [docs](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_BatchGetItem.html) | | `BatchWriteItem` | ✅ Supported | Up to 25 put/delete operations; every item and key is checked against its table's key schema before any write is applied; records SuccessfulRequestLatency/ConsumedWriteCapacityUnits per table touched | [docs](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_BatchWriteItem.html) | ### Query & scan | Operation | Status | Notes | AWS Docs | | --- | --- | --- | --- | | `Query` | ✅ Supported | `KeyConditionExpression` (values type-checked against the declared key types), `FilterExpression`, `Limit` (applied before `FilterExpression` per AWS semantics), `ExclusiveStartKey`/`LastEvaluatedKey` pagination, `ScanIndexForward`, `Select=COUNT`; `ConsistentRead=true` on a GSI is rejected as AWS does; records SuccessfulRequestLatency and ConsumedReadCapacityUnits (with GlobalSecondaryIndexName when IndexName names a real GSI); a reserved word used as a bare attribute name in an expression is rejected, as AWS does — reach it through `ExpressionAttributeNames` | [docs](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_Query.html) | | `Scan` | ✅ Supported | `FilterExpression`, `Limit` (applied before `FilterExpression` per AWS semantics), `ExclusiveStartKey`/`LastEvaluatedKey` pagination, parallel scan (`Segment`/`TotalSegments`), `Select=COUNT`; `ConsistentRead=true` on a GSI is rejected as AWS does; records SuccessfulRequestLatency and ConsumedReadCapacityUnits (with GlobalSecondaryIndexName when IndexName names a real GSI); a reserved word used as a bare attribute name in an expression is rejected, as AWS does — reach it through `ExpressionAttributeNames` | [docs](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_Scan.html) | ### Transactions | Operation | Status | Notes | AWS Docs | | --- | --- | --- | --- | | `TransactGetItems` | ✅ Supported | Up to 100 items across tables; every key is checked against its table's key schema; records SuccessfulRequestLatency/ConsumedReadCapacityUnits per table (2x weighted, matching AWS's transactional-read capacity accounting) | [docs](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_TransactGetItems.html) | | `TransactWriteItems` | ✅ Supported | Put, Update, Delete, ConditionCheck; all-or-nothing; a key-schema mismatch is a `ValidationException` raised before anything is applied, not a cancellation reason; records SuccessfulRequestLatency/ConsumedWriteCapacityUnits per table (2x weighted, matching AWS's transactional-write capacity accounting) | [docs](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_TransactWriteItems.html) | ### Tags | Operation | Status | Notes | AWS Docs | | --- | --- | --- | --- | | `TagResource` | ✅ Supported | Merges tags; max 50; validates key/value lengths | [docs](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_TagResource.html) | | `ListTagsOfResource` | ✅ Supported | Returns tags as Key/Value array | [docs](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_ListTagsOfResource.html) | | `UntagResource` | ✅ Supported | Removes specified keys; idempotent on missing keys | [docs](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_UntagResource.html) | ### Streams interoperability | Operation | Status | Notes | AWS Docs | | --- | --- | --- | --- | | `GetShardIterator` | ✅ Supported | TRIM_HORIZON, LATEST, AT/AFTER_SEQUENCE_NUMBER | [docs](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_streams_GetShardIterator.html) | ### Global tables | Operation | Status | Notes | AWS Docs | | --- | --- | --- | --- | | `CreateGlobalTable` | ❌ Unsupported | Overcast emulates a single region | [docs](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_CreateGlobalTable.html) | | `DescribeGlobalTable` | ❌ Unsupported | Overcast emulates a single region | [docs](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_DescribeGlobalTable.html) | | `DescribeGlobalTableSettings` | ❌ Unsupported | Overcast emulates a single region | [docs](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_DescribeGlobalTableSettings.html) | | `ListGlobalTables` | ❌ Unsupported | Overcast emulates a single region | [docs](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_ListGlobalTables.html) | | `UpdateGlobalTable` | ❌ Unsupported | Overcast emulates a single region | [docs](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_UpdateGlobalTable.html) | | `UpdateGlobalTableSettings` | ❌ Unsupported | Overcast emulates a single region | [docs](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_UpdateGlobalTableSettings.html) | ## Related - [DynamoDB](/docs/services/dynamodb/index.md) — quick start, what works, and the differences from AWS - [All service pages](/docs/services/index.md)