Making execution class assignments indiscriminately does not usually yield what you expect. Certain conditions yield better performance for each execution object type. Table 4-5 indicates when assigning an execution precedence might be advantageous for each type of execution object.
| Execution object | Description | 
|---|---|
| Client application | There is little contention for non-CPU resources among client applications. | 
| Adaptive Server login | One login should have priority over other logins for CPU resources. | 
| Stored procedure | There are well-defined stored procedure “hot spots.” | 
It is more effective to lower the execution class of less-critical execution objects than to raise the execution class of a highly critical execution object.