select count(*) from v$session where
status='ACTIVE';
select sid,serial
#,usern
ame,program,machine,status from v$session;
alter
System set processes = 300 sco
PE = spfile;
SQL>select o
SUSEr,a.username,cpu_time/executions/1000000||'s',sql_fulltext,machine
SQL>from v$session a,v$sqlarea b
SQL>where a.sql_address = b.address
SQL>order by cpu_time/executions desc;
su - oracle
SQL>sqlplus system/pwd as sysdba //进入sql
SQL>startup //启动数据库
SQL>lsnrctl start //启动监听
sqlplus "/as sysdba"
SQL>shutdown immediate; //关闭数据库
SQL>startup
mount;
SQL>alter database open;