oracle 查看库表状态

select a.status,b.open_mode from gv$instance a,gv$database b;  (查看数据库状态)

select * from dba tablespace_usage_metrics order by USED_PERCENT desc ;  (查看表空间)

select inst id,count(*) from gv$session group by inst_id;   (查看数据库连接数)

select total mb,free_mb,name from v$asm_diskgroup; （查看磁盘使用率）

select event , count (*) from gv$session group by event order by count (*);  (查看当前等待事件)

select userenv ('language') from dual;   (查看server端字符集)