Amazon DynamoDB catalogs #

Use an Amazon DynamoDB catalog to configure access to an Amazon DynamoDB database.

Follow these steps to begin creating a catalog for DynamoDB:

• In the navigation menu, select Data, then Catalogs.
• Click Create catalog.

• On the Select a data source pane, click the DynamoDB icon.

  

• Follow the instructions in the next sections to configure your DynamoDB connection.

Define catalog name and description #

The Catalog name is visible in the query editor and other clients. It is used to identify the catalog when writing SQL or showing the catalog and its nested schemas and tables in client applications.

The name is displayed in the query editor, and in the output of a SHOW CATALOGS command. It is used to fully qualify the name of any table in SQL queries following the catalogname.schemaname.tablename syntax. For example, you can run the following query in the sample cluster without first setting the catalog or schema context: SELECT * FROM tpch.sf1.nation;.

The Description is a short, optional paragraph that provides further details about the catalog. It appears in the Starburst Galaxy user interface and can help other users determine what data can be accessed with the catalog.

DynamoDB connection #

Use the following steps to configure the connection to your DynamoDB cluster:

• In the DynamoDB region drop-down menu, choose the region where your data resides.

• Select between Cross account IAM role or AWS access key to grant access to the object storage.

  • With Cross account IAM role, provide an alias for the role in Starburst Galaxy and the AWS IAM ARN.

  • With AWS access key, provide the AWS access key for DynamoDB and the AWS secret key for DynamoDB.

Read External security in AWS to learn about configuring these details in the AWS console.

Test the connection #

Once you have configured the connection details, click Test connection to confirm data access is working. If the test is successful, you can then save the catalog.

If the test fails, look over your entries in the configuration fields, correct any errors, and try again. If the test continues to fail, Galaxy provides diagnostic information that you can use to fix the data source configuration in the cloud provider system.

Connect catalog #

Click Connect catalog, and proceed to set permissions where you can grant access to certain roles.

Set permissions #

This optional step allows you to configure read-only access or full read and write access to the catalog.

Use the following steps to assign read-only access to all roles:

1. Select the Read-only catalog switch to grant a set of roles read-only access to the catalog’s schemas, tables, and views.
2. Next, use the drop-down menu in the Role-level permissions section to specify the roles that have read-only access.
3. Click Save access controls.

You can specify read-only access and read-write access separately for different sets of roles. That is, one set of roles can get full read and write access to all schemas, tables, and views in the catalog, while another set of roles gets read-only access.

Use the following steps to assign read/write access to some or all roles:

1. Leave the Read-only catalog switch cleared.
2. In the Role-level permissions section:
   • Expand the drop-down menu in the Roles with read and write access field and select one or more roles to grant read and write access to.
   • Expand the drop-down menu in the Roles with read access field and select one or more roles from the list to grant read-only access to.
3. Click Save access controls.

Add to cluster #

You can add your catalog to a cluster later by editing a cluster. Click Skip to proceed to the catalogs page.

Use the following steps to add your catalog to an existing cluster or create a new cluster in the same cloud region:

• In the Add to cluster section, expand the menu in the Select cluster field.
• Select one or more existing clusters from the drop down menu.
• Click Create a new cluster to create a new cluster in the same region, and add it to the cluster selection menu.

• Click Add to cluster to view your new catalog’s configuration.

   

The Pending changes to clusters dialog appears when you try to add a catalog to a running cluster.

• In the Pending changes to cluster dialog, click Return to catalogs to edit the catalog or create a new catalog.
• Click Go to clusters to confirm the addition of the catalog to the running cluster.

• On the Clusters page, click the Update icon beside the running cluster, to add the catalog.

   

SQL support #

The catalog provides read access to data and metadata in DynamoDB. It supports the following features:

• Globally available statements
• Read operations

Performance #

The connector includes a number of performance improvements, detailed in the following sections:

Pushdown #

The catalog supports partial predicate pushdown, which is disabled by default. Use the enable_predicate_pushdown session property to enable it:

set session <galaxy_catalog_name>.enable_predicate_pushdown = true;