oracle积累

查询oracle的dbLink
select owner,object_name from dba_objects where object_type='DATABASE LINK';#查询出dba用户下的dblink
select * from user_objects t where t.object_type='DATABASE LINK'   #查询当前用户下的dblink


--查询所有的表
select * from user_tab_comments
--查询表的字段信息
select column_name,data_type,data_length,nullable from user_tab_columns where Table_Name='I_SIGN_SITUATION_DETAILS'
--查询字段的注释
select column_name,comments from user_col_comments where TABLE_NAME='I_SIGN_SITUATION_DETAILS'


--工作中的点滴积累
SELECT l.session_id sid, 
s.serial#, 
l.locked_mode 锁模式, 
l.oracle_username 登录用户, 
l.os_user_name 登录机器用户名, 
s.machine 机器名, 
s.terminal 终端用户名, 
o.object_name 被锁对象名, 
s.logon_time 登录数据库时间 
FROM v$locked_object l, all_objects o, v$session s 
WHERE l.object_id = o.object_id 
AND l.session_id = s.sid 
ORDER BY sid, s.serial#;
--解锁引号中'sid,serial'
ALTER system kill session '60,4111';     


批量解决锁表
declare cursor mycur is
select s.sid,s.serial# from
　　 v$locked_object l, all_objects o, v$session s
    WHERE l.object_id = o.object_id
       AND l.session_id = s.sid and  object_name='WM_BIN_ALLOCATE'
    ORDER BY sid, s.serial#;
begin
  for cur in mycur
    loop
     execute immediate ( 'alter system  kill session  '''||cur.sid || ','|| cur.SERIAL# ||''' ');
     end loop;
end;



--查看表空间
select   *   from   dba_tablespaces;
--查看表空间文件路径
 select tablespace_name,file_id,bytes/1024/1024,file_namefrom dba_data_files order by file_id;
--查看用户和默认表空间的关系
select   username,default_tablespace   from   dba_users;

--查询oracle数据库实例sql
select instance_name from v$instance;

--创建临时表空间
CREATE TEMPORARY TABLESPACE BGDATA_TEMP TEMPFILE '/data/app/oracle/oradata/orcl/temp02.dbf ' SIZE 512M REUSE AUTOEXTEND ON NEXT 50M MAXSIZE UNLIMITED;
 
--创建数据表空间
CREATE TABLESPACE BGDATA DATAFILE '/data/app/oracle/oradata/orcl/bg_data.dbf' SIZE 50M REUSE AUTOEXTEND ON NEXT 50M MAXSIZE UNLIMITED;
 
--删除表空间
DROP TABLESPACE BGDATA INCLUDING CONTENTS AND DATAFILES;

创建用户及授权
-- Create the user
create user bg
  identified by cms2018
  default tablespace BGDATA
  temporary tablespace BGDATA_TEMP;
-- Grant/Revoke role privileges 
grant connect to bg;
grant resource to bg;
grant dba to bg;



输入命令taskkill /pid 进程号 -f 终止相应进程即可

批量结束同一个进程
taskkill /f /im nginx.exe


进入命令提示符窗口后，输入“netstat -ano”并按下回车执行，之后就会显示电脑上运行的所有端口了；
输入“tasklist|findstr “端口号””并按下回车，假设查询端口为2720的进程名称；