java.sql.SQLException: Listener refused the connection with the following error: ORA-12505, TNS:lis

原因：连接数过多，多实例需要切换实例来加大连接数，整合了一下。

sql>show user;查看当前用户

sql>show parameter instance_name;查看当前数据库实例

sql>set ORACLE_SID=实例名 --切换实例（linux为export）

SQL> select count(*) from v$process;--当前连接数

SQL> select value from v$parameter where name = 'processes' --数据库允许的最大连接数

修改最大连接数:

SQL> alter system set processes = 2000 scope = spfile;

重启数据库:

SQL> shutdown immediate;

SQL> startup;

--查看当前有哪些用户正在使用数据

SELECT osuser, a.username,cpu_time/executions/1000000||'s', sql_fulltext,machine

from v$session a, v$sqlarea b

where a.sql_address =b.address order by cpu_time/executions desc;

--快速删除不活动进程

set heading off

spool on

select p.SPID from v$session s,v$process p where s.paddr= p.addr and s.machine='woogle';

spool off

set serveroutput on ;

declare

v_sid number;

v_serial number;

v_sql varchar2(200) ;

CURSOR cur_session is

select sid, serial# from v$session where machine='woogle';

begin

open cur_session ;

fetch cur_session into v_sid , v_serial ;

while cur_session%found

loop

dbms_output.put_line(v_sid||' killed!') ;

v_sql:= 'alter system kill session '||''''||v_sid||','||v_serial||'''';

execute immediate v_sql ;

fetch cur_session into v_sid , v_serial ;

end loop ;

close cur_session ;

end ;

/

Linux 下快速删除不活动进程

#!/bin/bash

tmpfile=/tmp/tmp.$$

sqlplus ' / as sysdba' << EOF

set heading off

spool on

spool $tmpfile

select p.SPID from v$session s,v$process p where s.paddr= p.addr and s.STATUS='SNIPED';

spool off

set serveroutput on ;

declare

v_sid number;

v_serial number;

v_sql varchar2(200) ;

CURSOR cur_session is

select sid, serial# from v$session where STATUS='SNIPED';

begin

open cur_session ;

fetch cur_session into v_sid , v_serial ;

while cur_session%found

loop

dbms_output.put_line(v_sid||' killed!') ;

v_sql:= 'alter system kill session '||''''||v_sid||','||v_serial||'''';

execute immediate v_sql ;

fetch cur_session into v_sid , v_serial ;

end loop ;

close cur_session ;

end ;

/

OERR: ORA-12519 TNS:no appropriate service handler found

url：http://blog.csdn.net/wyzxg/archive/2008/03/06/2154274.aspx

2008/03/06

skate