【DM版本】:DM Database Server 64 V8
【操作系统】：Linux version 3.10.0-862.el7.x86_64 (builder@kbuilder.dev.centos.org) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-28) (GCC) ) #1 SMP Fri Apr 20 16:44:24 UTC 2018
【CPU】:Intel(R) Xeon(R) CPU E5-2650 0 @ 2.00GHz
【问题描述】*：SELECT CURRENT_SCN FROM V$DATABASE
dm怎么查询当前scn