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zk/DynamoDB SDK commands.md

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+---
+id: 8b6h
+title: DynamoDB SDK commands
+tags: [AWS, databases, dynamodb]
+created: Sunday, June 23, 2024
+---
+
+# DynamoDB SDK commands
+
+The following commands are for using `@aws-sdk/client-dynamodb` (the JS SDK).
+
+## Create client
+
+```js
+import DynamoDBClient from "@aws-sdk/client-dynamodb";
+
+const client = new DynamoDBClient({
+  region: "eu-west-2",
+  accessKeyId: process.env.ACCESS_KEY_ID,
+  secretAccessKey: process.env.ACCESS_KEY_ID,
+});
+```
+
+## Query a table
+
+Querying is the most performant and cost-effective method since it is an O(1)
+lookup against a partition key or secondary index.
+
+## Scan a table
+
+Scanning is less performant (O(n)) and most expensive since it requires checking
+every item in the database.
+
+## Related notes