![]() When creating a database using AWS Glue Data Catalog for datashares, see Working with Lake Formation-managed datashares as a consumer. GET operation on the Amazon S3 objects the bucket contains. Permission to perform a LIST operation on the Amazon S3 bucket to be accessed and a ![]() Use the Amazon Resource Name (ARN) for an IAM role that your cluster usesįor authentication and authorization. Which explains how to configure federated identity. See Using a federated identity to manage Amazon Redshift access to local resources and Amazon Redshift Spectrum external tables, For an example of using a federated identity, Tables from the external schema created using this command. Use 'SESSION' if you connect to your Amazon Redshift cluster using a federated identity and access the Specifying the default keyword means to use the IAM role that's setĪs the default and associated with the cluster. If you specify an IAM role that is associated with the cluster when running the CREATE DATABASE command,Īmazon Redshift will use the role’s credentials when you run queries on the database. This parameter is only applicable if your CREATE DATABASE command also uses the The SQL they run follows this timeline with these results: The following scenario illustrates write skew updates using the SNAPSHOT isolation level.Ī table named Numbers contains a column named digits that contains 0 and 1 values.Įach user's UPDATE statement doesn't overlap the other user. However, SNAPSHOT isolation doesn't provide full serializability, because it doesn't prevent write skew inserts and updates on different table rows. That is, dirty reads, non-repeatable reads, and phantom reads are prevented according to the SQL standard.īoth isolation levels guarantee that a transaction operates on a snapshot of data as it exists when the transaction begins,Īnd that no other transaction can change that snapshot. In Amazon Redshift databases, both SERIALIZABLE and SNAPSHOT isolation are types of serializable isolation levels. The isolation level per database appears next to the key concurrency_model. SELECT datname, datconfig FROM pg_database_info
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