is '等待队列';
comment on column stats$vmstat.swap_in
is '每秒平均交换进lwps数';
comment on column stats$vmstat.swap_out
is '交换出进程数';
comment on column stats$vmstat.kbytes_page_in
is '换页进字节(k)';
comment on column stats$vmstat.kbytes_page_out
is '换页出字节(k)';
comment on column stats$vmstat.page_scan
