Oracle 异常排查

运行状态

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select sys_context( 'USERENV', 'SID' ) from dual;

会话列表

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SELECT sess.process, sess.status, sess.username, sess.schemaname, sql.sql_text
FROM v$session sess, v$sql sql
WHERE sql.sql_id(+) = sess.sql_id
AND sess.type='USER';

正在执行SQL

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SELECT b.sid oracleID,
       b.username 用户名,
       b.serial#,
       paddr,
       sql_text 正在执行的SQL,
       b.machine 计算机名称
FROM v$process a, v$session b, v$sqlarea c
WHERE a.addr = b.paddr
   AND b.sql_hash_value = c.hash_value;

检查锁表

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SELECT l.session_id sid,  
       s.serial#,  
       l.locked_mode 锁模式,  
       l.oracle_username 登录用户,  
       l.os_user_name 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#;

alter system kill session 'sid,serial#'

启动历史

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select * from dba_hist_database_instance order by startup_time desc;

检查Oracle服务是否运行

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ps -ef | grep pmon

检查监听是否运行

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lsnrctl status

启动服务

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sqlplus / as sysdba
startup

启动监听

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lsnrctl start

没有网络导致连接超时

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vi /etc/resolv.conf

删除 nameserver