The size or number given items requiring system resources(such as mailboxes,locked pages,I/O requests,and open files) that a job is allowed to have at any one time during execution.

• 某项业务在每次运行期间允许有的给定项目的系统资源的大小或数目（例如信箱区、被锁页面、输入输出需求和打开的文件）。