Keep in mind that as you add new queues, the default queue must be the last queue in the WLM configuration. One default user queue, which by default is configured to run up to five queries concurrently.One Superuser queue, which is reserved only for the superuser role and it cannot be configured.By default, Amazon Redshift defines two queues.The principal mechanism that allows the management of resources is the definition of priorities queues for the execution of queries.Which is the mechanism that Redshift offers for managing the queries that you have to execute on your cluster against the available resources? A few notable things about Redshift Workload Management, Introducing Amazon Redshift WorkLoad Management In this way, it is possible to prioritize the execution of our queries taking into consideration their importance again the available resources that we have. So how do you deal with these situations? Fortunately, Amazon Redshift is equipped with a mechanism that allows us to manage the resources of a cluster by creating priorities queues with specific resources attached to them and then attach queries to these queues. As soon as you start using your Amazon Redshift cluster in a production environment, you will experience a situation where an ad-hoc query that takes too long to complete might block some important queries that have to generate a report. Queries that in most cases will have to be scheduled to run at specific time intervals to generate new reports and their execution time, together with the resources needed will vary greatly. As you start digging further and further into your data, more queries will have to be executed. No matter how big your Amazon Redshift cluster is, it will always have a certain amount of resources available. Bonus Material: FREE Amazon Redshift Guide for Data Analysts PDF
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