Managing workloads

Vertica's resource management scheme allows diverse, concurrent workloads to run efficiently on the database. For basic operations, Vertica pre-configures the built-in GENERAL pool based on RAM and machine cores. You can customize the General pool to handle specific concurrency requirements.

You can also define new resource pools that you configure to limit memory usage, concurrency, and query priority. You can then optionally assign each database user to use a specific resource pool, which controls memory resources used by their requests.

User-defined pools are useful if you have competing resource requirements across different classes of workloads. Example scenarios include:

• A large batch job takes up all server resources, leaving small jobs that update a web page without enough resources. This can degrade user experience.

  In this scenario, create a resource pool to handle web page requests and ensure users get resources they need. Another option is to create a limited resource pool for the batch job, so the job cannot use up all system resources.

• An application has lower priority than other applications and you want to limit the amount of memory and number of concurrent users for the low-priority application.

  In this scenario, create a resource pool with an upper limit on the query's memory and associate the pool with users of the low-priority application.

You can also use resource pools to manage resources assigned to running queries. You can assign a run-time priority to a resource pool, as well as a threshold to assign different priorities to queries with different durations. See Managing resources at query run time for more information.

Enterprise Mode and Eon Mode

In Enterprise Mode, there is one global set of resource pools for the entire database. In Eon Mode, you can allocate resources globally or per subcluster. See Managing workload resources in an Eon Mode database for more information.