scheduler(repeat_interval)【每日一译】--2013-01-29

repeat_interval关于period参数

PERIODS This identifies the number of periods that together form one cycle of a

user-defined frequency. It is used in the repeat_interval expression of

the schedule that defines the user-defined frequency. It is mandatory when

the repeat_interval expression in the main schedule contains a

BYPERIOD clause. The following example defines the quarters of a fiscal

year.

FREQ=YEARLY;BYDATE=0301,0601,0901,1201;PERIODS=4

periods表示一个时期的数字，它形成一种用户自定义频率的循环格式。它用于定义在用户

自定义频率中repeat_interval的表达式中。它将被引用的当repeat_interval表达式在主调用计划

中使用byperiod语句。以下的语句定义了一个的4个季节；

FREQ=YEARLY;BYDATE=0301,0601,0901,1201;PERIODS=4

BYPERIOD This selects periods from a user-defined frequency. For example, if a main

schedule names a user-defined frequency schedule that defines the fiscal

quarters shown in the previous example, the clause BYPERIOD=2,4 in the

main schedule selects the 2nd and 4th fiscal quarters.

byperiod选择用户定义频率的时期。比如像前面例子中一个主调用计划命名一个用户自定义

频率调用计划定义的整年多个季节，语句BYPERIOD=2,4在主调用计划中它将选择全年中

第2和第4个季节；