When a workload is created in SLES 10, it is assigned an enforcement priority (EP) and an allocation group (AG). An EP is a label given to assign weights for the queries running in a workload. Each AG takes the EP of the first workload associated with it and after that, only workloads with the same EP can be associated to that AG. As a result, each AG is a collection of one or more workloads that share the same EP. Multiple AGs can use the same EP. Teradata Database uses the following EPs:
- Tactical queries are short, critical queries with defined service level goals. They are typically single or few-AMP queries or all-AMP queries that consume less than 1 CPU-second per node.
- Priority queries are important and have higher priority than most other work.
- Normal queries are the average priority work running on the system.
- Background queries run for work that does not have a response-time requirement.