当执行数据库监视活动时，将从监视堆分配内存，这些活动包括拍摄快照、打开监视器开关、重置监视器或激活一个事件监视器。
Memory is allocated from the monitor heap when you perform database monitoring activities such as taking a snapshot, turning on a monitor switch, resetting a monitor, or activating an event monitor.
在没有分布统计信息的情况下，执行该查询时，动态sql的一个快照返回以下监视器值(假定所需的监视器开关已激活)。
When the query is executed without distribution statistics, a snapshot for dynamic SQL returns the following monitor values (given that the required monitor switches are active).
几乎所有地区的前区20区22号材料，传感器，可提供接近开关到直径80毫米或在一级螺纹g1监视器。
Sensors for almost all materials in the Ex area zone 20 or zone 22 can be delivered as proximity switches up to 80 mm diameter or as used as level monitor with G1 thread.
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