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Troubleshooting ORA-600 [H_MK_WRITING_CR_BG] 11.2.0.3 standby instance crash

env: 11.2.0.3 RAC Dataguard ON Exadata x2, a standby instance crash, alert log show ora-600 internal error, ORA-00600: internal error code, arguments: [H_MK_WRITING_CR_BG], []

How to release still “killed“ status session in v$session? (释放killed的session) (三)

昨天数据库有3个session记录在v$session一直是KILLED状态,且已经好几个小时,当前的等待事件为”db file sequential read”, 其中有一个session是DML SQL,所以最后在事务结束前的行级锁一直未能释放,影响了操作相同记录的业务, 从数据库尝试kill [immeidate]没报错但是无法清理,手动weekup PMON检查PMON trace无报错, 通过操作系统层KILL -9 无报错仍无法清理

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Troubleshooting ORA-00600: [kcladdle_1], [], [] in RAC 11.2.0.3

突然数据库出现了较高的enq: TX – row lock contention的等待事件,这是一个APPLICATION CLASS的wait event, 通常出现在DML事务级的行或块竞争,这次的MODE为6, 语句只是简单的delete xx where rowid=:bind; 但是查看数据库和应用日志都出现了ORA-600的错误, 判断问题就不再是简单的行事务竞争, 手动模拟语句也还原出问题,但并不是所有记录每次都能触发,现象为运行DELETE SQL时失败并出现ora-600 [kcladdle_1].