这个计划是经过反复讨论而产生的。
这将极大地提高性能，因为数据库节约了对相同的查询反复计算执行计划所需的所有开销。
This improves performance chiefly because the database saves all the overhead involved with calculating the execution plan for the same query over and over.
可以将作业立即提交为可用，或者在计划时间和日期提交，也可以反复提交。
The jobs may be submitted as available immediately, at a scheduled time and date, or on a repeating basis.
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