hwm high water mark 高潮标记
HWM used (KB) : High-water mark, or peak, memory that the consumer has used.
HWM Used (KB)：该消耗者曾使用的内存的高水位标记或峰值。
HWM usage is the high water mark (HWM) or peak memory usage that has been consumed since the activation of the database partition when the db2start command was run.
HWM usage是当db2start命令在运行时，自数据库分区激活以来的最高水位标记(high water mark, HWM)或峰值内存使用量。
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