背景:在日常运维工作中,各种各样的问题,真是千奇百怪。今天遇到这个问题了,查了一些解决办法,做了一个汇总,今天就分享一下。 错误:ORA-12519, TNS:no appropriate service handler found [[email protected] ~]$ oerr ora 12519 12519, 00000, "TNS:no appropriate service handler found" // *Cause: The listener could not find any available service handlers that // are appropriate for the client connection. // *Action: Run "lsnrctl services" to ensure that the instance(s) have // registered with the listener, and are accepting connections.
主要从两个方面来考虑这件事,从程序方面来看:
1.进行数据库连接操作后未释放连接;
2.若使用了数据库连接池,则考虑连接池的超时设置。
从数据库本身来看:
1.可以增加数据库的最大连接数;
2.可以定时清理数据库中INACTIVE的会话。
对运维人员来说,只能从数据库本身入手:
select count(*) from v$process; --目前的会话 select value from v$parameter where name = ‘processes‘ ; --最大会话 一般生产环境processes参数设置为2000,如果应用特别多的,可以设置为3000. 查看从哪里连接的Oracle链接数: select b.MACHINE, b.PROGRAM , count(*) from v$process a, v$session b where a.ADDR = b.PADDR and b.USERNAME is not null group by b.MACHINE , b.PROGRAM order by count(*) desc;
定时清理INACTIVE会话需要创建一个存储过程找出超过2小时(根据需求设定)的会话,然后断开会话,具体如下: CREATE OR REPLACE PROCEDURE DB_KILL_IDLE_CLIENTS AUTHID DEFINER AS--AUTHID DEFINER可省略。 job_no number := 0; num_of_kills number := 0; BEGIN FOR REC IN (SELECT SID, SERIAL#, INST_ID, MODULE, STATUS FROM gv$session S WHERE S.USERNAME IS NOT NULL AND S.LAST_CALL_ET >= 2 * 60 * 60 AND S.STATUS = ‘INACTIVE‘ ORDER BY INST_ID ASC) LOOP DBMS_OUTPUT.PUT(‘LOCAL SID ‘ || rec.sid || ‘(‘ || rec.module || ‘)‘); execute immediate ‘alter system disconnect session ‘‘‘ || rec.sid || ‘, ‘ || rec.serial# || ‘‘‘immediate‘; DBMS_OUTPUT.PUT_LINE(‘. killed locally ‘ || job_no); num_of_kills := num_of_kills + 1; END LOOP; DBMS_OUTPUT.PUT_LINE(‘Number of killed system sessions: ‘ || num_of_kills); END DB_KILL_IDLE_CLIENTS;
创建定时任务执行这个存储过程: begin sys.dbms_job.submit(job => :job, what => ‘SYS.DB_KILL_IDLE_CLIENTS;‘, next_date => to_date(‘25-05-2018 17:00:00‘, ‘dd-mm-yyyy hh24:mi:ss‘), interval => ‘TRUNC(sysdate,‘‘hh‘‘) + 1/(24)‘); commit; end; 注意以sys角色登录操作 ————————————————
--单次使用:
SELECT ‘alter system disconnect session ‘‘‘ || sid || ‘,‘ || serial# ||
‘‘‘ immediate;‘
FROM (SELECT SID, SERIAL#, INST_ID, MODULE, STATUS
FROM gv$session S
WHERE S.USERNAME IS NOT NULL
AND S.LAST_CALL_ET >= 2 * 60 * 60
AND S.STATUS = ‘INACTIVE‘
ORDER BY INST_ID ASC)
查出来的语句执行即可。
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版权声明:本文为CSDN博主「京斗码农」的原创文章,遵循 CC 4.0 BY-SA 版权协议,转载请附上原文出处链接及本声明。
原文链接:https://blog.csdn.net/weixin_42163563/java/article/details/90294916
原文地址:https://www.cnblogs.com/xiaohuizhenyoucai/p/12657745.html
时间: 2024-10-08 13:24:07