1、查詢Oracle併發數、會話數、連接數:
select count(*) from v$session #當前的連接數
select count(*) from v$session where status='ACTIVE' #併發連接數
select value from v$parameter where name = 'processes' #數據庫允許的最大連接數
show parameter processes #最大連接
select username,count(username) from v$session where username is not null group by username; #查看不同用戶的連接數
2、查詢、修改最大連接數
alter system set processes = 300 scope = spfile;
#注意:修改後需要重啓數據庫才能生效
#通過控制檯進入SQL窗口
sqlplus / as sysdba
shutdown immediate;
startup;
3、查看oracle日誌路徑
select * from v$logfile;
4、查詢最近所有的SQL操作
select * from v$sql;