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最近发表
- 文件系统格式化MySQL数据库恢复
- .sstop勒索加密数据库恢复
- 解决一次硬件恢复之后数据文件0kb的故障恢复case
- Error in invoking target ‘libasmclntsh19.ohso libasmperl19.ohso client_sharedlib’问题处理
- ORA-01171: datafile N going offline due to error advancing checkpoint
- linux环境oracle数据库被文件系统勒索加密为.babyk扩展名溯源
- ORA-600 ksvworkmsgalloc: bad reaper
- ORA-600 krccfl_chunk故障处理
- Oracle Recovery Tools恢复案例总结—202505
- ORA-600 kddummy_blkchk 数据库循环重启
- 记录一次asm disk加入到vg通过恢复直接open库的案例
- CHECKDB 发现了 N 个分配错误和 M 个一致性错误
- 达梦数据库dm.ctl文件异常恢复
- Oracle Recovery Tools修复ORA-00742、ORA-600 ktbair2: illegal inheritance故障
- 可能是 tempdb 空间用尽或某个系统表不一致故障处理
- 11.2.0.4库中遇到ORA-600 kcratr_nab_less_than_odr报错
- [MY-013183] [InnoDB] Assertion failure故障处理
- Oracle 19c 202504补丁(RUs+OJVM)-19.27
- Oracle Recovery Tools修复ORA-600 6101/kdxlin:psno out of range故障
- pdu完美支持金仓数据库恢复(KingbaseES)
分类目录归档:Oracle备份恢复
ORA-00600[kcratr1_lostwrt]/ORA-00600[3020]错误恢复
open数据库alert日志报ORA-00600[kcratr1_lostwrt]错误
Mon May 14 14:57:28 2012 ALTER DATABASE OPEN Mon May 14 14:57:29 2012 Beginning crash recovery of 1 threads Mon May 14 14:57:29 2012 Started redo scan Mon May 14 14:57:29 2012 Errors in file d:\oracle\admin\cqgasold\udump\cqgasold_ora_504.trc: ORA-00600: 内部错误代码,参数: [kcratr1_lostwrt], [], [], [], [], [], [], [] ORA-600 signalled during: alter database open...
查询相关SCN
同一个查询中SCN相同,省略
SQL> select file#,online_status "STATUS",to_char(change#,'9999999999999999') "SCN", 2 To_char(time,'yyyy-mm-dd hh24:mi:ss')"TIME" from v$recover_file; 未选定行 SQL> select file#,to_char(checkpoint_change#,'999999999999999') "SCN", 2 to_char(last_change#,'999999999999999')"STOP_SCN" from v$datafile; FILE# SCN STOP_SCN ---------- ---------------- ---------------- 1 7842987188 2 7842987188 3 7842987188 SQL> select file#,to_char(checkpoint_change#,'9999999999999999') "SCN", 2 to_char(RESETLOGS_CHANGE#,'9999999999999999') "RESETLOGS SCN" 3 from v$datafile_header; FILE# SCN RESETLOGS SCN ---------- ----------------- ----------------- 1 7842991811 1 2 7842991811 1 3 7842991811 1
这里看到奇怪现象datafile scn小于datafile_header scn,数据库异常断电一般来说也不会出现这样的情况,个人猜测是错误的恢复或者使用历史控制文件导致,对于这样的现状,我先尝试着使用using backup controlfile方式恢复,结果失败.估计控制文件有异常,本着先拉起库原则,重建控制文件.
进行完全恢复
SQL> recover database; ORA-00283: 恢复会话因错误而取消 ORA-00600: 内部错误代码,参数: [3020], [8388617], [1], [23403], [25], [112],[], [] ORA-10567: Redo is inconsistent with data block (file# 2, block# 9) ORA-10564: tablespace UNDOTBS1 ORA-01110: 数据文件 2: 'D:\ORACLE\ORADATA\CQGASOLD\UNDO_1.DBF' ORA-10560: block type 'KTU SMU HEADER BLOCK'
尝试跳过坏块继续恢复
SQL> recover database allow 1 corruption; ORA-00283: 恢复会话因错误而取消 ORA-00600: 内部错误代码,参数: [3020], [8388610], [1], [23403], [2264], [16],[], [] ORA-10567: Redo is inconsistent with data block (file# 2, block# 2) ORA-10564: tablespace UNDOTBS1 ORA-01110: 数据文件 2: 'D:\ORACLE\ORADATA\CQGASOLD\UNDO_1.DBF' ORA-10560: block type 'KTFB Bitmapped File Space Header'
使用dbv检查坏块数量
C:\>dbv file='d:\oracle\oradata\cqgasold\undo_1.dbf' blocksize=8192 DBVERIFY: Release 9.2.0.5.0 - Production on 星期二 5月 15 19:43:42 2012 Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved. DBVERIFY - 验证正在开始 : FILE = d:\oracle\oradata\cqgasold\undo_1.dbf DBV-00200: 块, dba 8388617, 已经标记为崩溃 汇入的页369 - 可能是介质损坏 *** Corrupt block relative dba: 0x00800171 (file 2, block 369) Fractured block found during dbv: Data in bad block - type: 2 format: 2 rdba: 0x00800171 last change scn: 0x0001.d37c57db seq: 0x1 flg: 0x04 consistency value in tail: 0x4e930260 check value in block header: 0x8202, computed block checksum: 0x4e5f spare1: 0x0, spare2: 0x0, spare3: 0x0 *** 汇入的页417 - 可能是介质损坏 *** Corrupt block relative dba: 0x008001a1 (file 2, block 417) Fractured block found during dbv: Data in bad block - type: 2 format: 2 rdba: 0x008001a1 last change scn: 0x0001.d37c53d4 seq: 0x2 flg: 0x04 consistency value in tail: 0x4b6b0201 check value in block header: 0x6ae7, computed block checksum: 0x5abc spare1: 0x0, spare2: 0x0, spare3: 0x0 *** ………… --类此记录很多,我放弃了跳过坏块修复的方法
恢复过程中提示坏块数据库文件离线恢复
SQL> alter database datafile 'd:\oracle\oradata\cqgasold\undo_1.dbf' offline; 数据库已更改。 SQL> recover database; 完成介质恢复。 SQL> alter database open; alter database open * ERROR 位于第 1 行: ORA-00604: 递归 SQL 层 1 出现错误 ORA-00376: 此时无法读取文件 2 ORA-01110: 数据文件 2: 'D:\ORACLE\ORADATA\CQGASOLD\UNDO_1.DBF'
到了这一步,根据经验,数据库被open的可能性很多了,很有可能是open以后因为smon回滚导致数据库down
查看日志,屏蔽回滚段,完成恢复
Tue May 15 19:59:52 2012 alter database open Tue May 15 19:59:52 2012 Beginning crash recovery of 1 threads Tue May 15 19:59:52 2012 Started redo scan Tue May 15 19:59:52 2012 Completed redo scan 323 redo blocks read, 82 data blocks need recovery Tue May 15 19:59:52 2012 Started recovery at Thread 1: logseq 23404, block 3, scn 0.0 Recovery of Online Redo Log: Thread 1 Group 4 Seq 23404 Reading mem 0 Mem# 0 errs 0: F:\ORACLE\ORADATA\LOGCQGASOLD4.ORA Tue May 15 19:59:52 2012 Completed redo application Tue May 15 19:59:52 2012 Ended recovery at Thread 1: logseq 23404, block 326, scn 1.3548264979 82 data blocks read, 82 data blocks written, 323 redo blocks read Crash recovery completed successfully Tue May 15 19:59:53 2012 Thread 1 advanced to log sequence 23405 Thread 1 opened at log sequence 23405 Current log# 2 seq# 23405 mem# 0: D:\ORACLE\ORADATA\CQGASOLD\REDO02.LOG Successful open of redo thread 1 Tue May 15 19:59:53 2012 SMON: enabling cache recovery SMON: enabling tx recovery Tue May 15 19:59:54 2012 Database Characterset is ZHS16GBK Tue May 15 19:59:55 2012 replication_dependency_tracking turned off (no async multimaster replication found) ORA-604 signalled during: alter database open... Tue May 15 19:59:56 2012 SMON: about to recover undo segment 1 SMON: mark undo segment 1 as needs recovery SMON: about to recover undo segment 2 SMON: mark undo segment 2 as needs recovery SMON: about to recover undo segment 3 SMON: mark undo segment 3 as needs recovery SMON: about to recover undo segment 4 SMON: mark undo segment 4 as needs recovery SMON: about to recover undo segment 5 SMON: mark undo segment 5 as needs recovery SMON: about to recover undo segment 6 SMON: mark undo segment 6 as needs recovery SMON: about to recover undo segment 7 SMON: mark undo segment 7 as needs recovery SMON: about to recover undo segment 8 SMON: mark undo segment 8 as needs recovery SMON: about to recover undo segment 9 SMON: mark undo segment 9 as needs recovery SMON: about to recover undo segment 10 SMON: mark undo segment 10 as needs recovery Tue May 15 20:00:37 2012 Shutting down instance (abort)
看到这里,可以大概确定是因为undo文件离线,导致回滚段异常.
这个问题,基本上可以确定通过隐含参数屏蔽回滚段,然后open数据库,重建undo删除异常undo,数据库恢复完成。
记录一次rman备份ORA-19502/ORA-27063错误原因分析
rman备份出现ORA-19502/ORA-27063错误
RMAN> 2> 3> 4> 5> 6> 7> 8> 9> 10> 11> 12> 13> 14> 15> 16> 17> 18> 19> 20> allocated channel: t11 channel t11: sid=824 instance=ncdb1 devtype=DISK allocated channel: t12 channel t12: sid=838 instance=ncdb1 devtype=DISK allocated channel: t13 channel t13: sid=809 instance=ncdb1 devtype=DISK allocated channel: t14 channel t14: sid=886 instance=ncdb1 devtype=DISK allocated channel: t15 channel t15: sid=620 instance=ncdb1 devtype=DISK allocated channel: t16 channel t16: sid=599 instance=ncdb1 devtype=DISK allocated channel: t17 channel t17: sid=482 instance=ncdb1 devtype=DISK allocated channel: t18 channel t18: sid=506 instance=ncdb1 devtype=DISK 一共开通8个通道 channel t12: starting full datafile backupset channel t12: specifying datafile(s) in backupset input datafile fno=00008 name=/dev/rnc32g_39 input datafile fno=00016 name=/dev/rnc32g_47 input datafile fno=00024 name=/dev/rnc32g_57 input datafile fno=00032 name=/dev/rnc32g_25 input datafile fno=00040 name=/dev/rnc32g_33 input datafile fno=00048 name=/dev/rnc32g_3 input datafile fno=00056 name=/dev/rnc32g_11 input datafile fno=00064 name=/dev/rnc32g_19 input datafile fno=00072 name=/dev/rnc32g_67 input datafile fno=00080 name=/dev/rnc32g_106 input datafile fno=00088 name=/dev/rnc32g_114 input datafile fno=00096 name=/dev/rnc32g_87 input datafile fno=00104 name=/dev/rnc32g_95 input datafile fno=00112 name=/dev/rnc32g_103 input datafile fno=00120 name=/dev/rnc32g_75 input datafile fno=00003 name=/dev/rnc50_sysaux input datafile fno=00130 name=/dev/rnc32g_119 channel t12: starting piece 1 at 14-MAY-12 --通道12备份数据文件 channel t17: starting full datafile backupset channel t17: specifying datafile(s) in backupset input datafile fno=00002 name=/dev/rnc32g_22 input datafile fno=00013 name=/dev/rnc32g_44 input datafile fno=00021 name=/dev/rnc32g_54 input datafile fno=00029 name=/dev/rnc32g_62 input datafile fno=00037 name=/dev/rnc32g_30 input datafile fno=00045 name=/dev/rnc32g_38 input datafile fno=00053 name=/dev/rnc32g_8 input datafile fno=00061 name=/dev/rnc32g_16 input datafile fno=00069 name=/dev/rnc32g_64 input datafile fno=00077 name=/dev/rncundo_33g_4 input datafile fno=00085 name=/dev/rnc32g_111 input datafile fno=00093 name=/dev/rnc32g_84 input datafile fno=00101 name=/dev/rnc32g_92 input datafile fno=00109 name=/dev/rnc32g_100 input datafile fno=00117 name=/dev/rnc32g_72 input datafile fno=00006 name=/dev/rnc50_4g_1 channel t17: starting piece 1 at 14-MAY-12 --通道17备份数据文件 channel t15: finished piece 1 at 15-MAY-12 piece handle=/rman/db_mpnb04jl_1_1 tag=TAG20120514T204954 comment=NONE channel t15: backup set complete, elapsed time: 06:07:59 channel t11: finished piece 1 at 15-MAY-12 piece handle=/rman/db_mlnb04jk_1_1 tag=TAG20120514T204954 comment=NONE channel t11: backup set complete, elapsed time: 06:17:25 channel t16: finished piece 1 at 15-MAY-12 piece handle=/rman/db_mqnb04jm_1_1 tag=TAG20120514T204954 comment=NONE channel t16: backup set complete, elapsed time: 06:34:49 channel t14: finished piece 1 at 15-MAY-12 piece handle=/rman/db_monb04jl_1_1 tag=TAG20120514T204954 comment=NONE channel t14: backup set complete, elapsed time: 06:40:05 channel t18: finished piece 1 at 15-MAY-12 piece handle=/rman/db_msnb04jn_1_1 tag=TAG20120514T204954 comment=NONE channel t18: backup set complete, elapsed time: 06:43:38 channel t13: finished piece 1 at 15-MAY-12 piece handle=/rman/db_mnnb04jl_1_1 tag=TAG20120514T204954 comment=NONE channel t13: backup set complete, elapsed time: 07:40:56 --这里可以看出rman的备份完成了通道11/13/14/15/16/18,也就是说目前为止通道12/17未完成. RMAN-03009: failure of backup command on t12 channel at 05/15/2012 04:39:58 ORA-19502: write error on file "/rman/db_mmnb04jl_1_1", blockno 30481025 (blocksize=8192) ORA-27063: number of bytes read/written is incorrect IBM AIX RISC System/6000 Error: 28: No space left on device Additional information: -1 Additional information: 1048576 ORA-19502: write error on file "/rman/db_mmnb04jl_1_1", blockno 30480897 (blocksize=8192) ORA-27063: number of bytes read/written is incorrect IBM AIX RISC System/6000 Error: 28: No space left on device channel t12 disabled, job failed on it will be run on another channel --通道12报错(硬盘空间不足) channel t11: starting full datafile backupset channel t11: specifying datafile(s) in backupset input datafile fno=00008 name=/dev/rnc32g_39 input datafile fno=00016 name=/dev/rnc32g_47 input datafile fno=00024 name=/dev/rnc32g_57 input datafile fno=00032 name=/dev/rnc32g_25 input datafile fno=00040 name=/dev/rnc32g_33 input datafile fno=00048 name=/dev/rnc32g_3 input datafile fno=00056 name=/dev/rnc32g_11 input datafile fno=00064 name=/dev/rnc32g_19 input datafile fno=00072 name=/dev/rnc32g_67 input datafile fno=00080 name=/dev/rnc32g_106 input datafile fno=00088 name=/dev/rnc32g_114 input datafile fno=00096 name=/dev/rnc32g_87 input datafile fno=00104 name=/dev/rnc32g_95 input datafile fno=00112 name=/dev/rnc32g_103 input datafile fno=00120 name=/dev/rnc32g_75 input datafile fno=00003 name=/dev/rnc50_sysaux input datafile fno=00130 name=/dev/rnc32g_119 channel t11: starting piece 1 at 15-MAY-12 --在通道12报错后,通道11已经完成了上次备份,所以启动备份通道12出错的数据文件 RMAN-03009: failure of backup command on t17 channel at 05/15/2012 04:39:58 ORA-19502: write error on file "/rman/db_mrnb04jm_1_1", blockno 30753793 (blocksize=8192) ORA-27063: number of bytes read/written is incorrect IBM AIX RISC System/6000 Error: 28: No space left on device Additional information: -1 Additional information: 1048576 ORA-19502: write error on file "/rman/db_mrnb04jm_1_1", blockno 30753665 (blocksize=8192) ORA-27063: number of bytes read/written is incorrect IBM AIX RISC System/6000 Error: 28: No space left on device channel t17 disabled, job failed on it will be run on another channel --通道17也因为磁盘空间报错 channel t13: starting full datafile backupset channel t13: specifying datafile(s) in backupset input datafile fno=00002 name=/dev/rnc32g_22 input datafile fno=00013 name=/dev/rnc32g_44 input datafile fno=00021 name=/dev/rnc32g_54 input datafile fno=00029 name=/dev/rnc32g_62 input datafile fno=00037 name=/dev/rnc32g_30 input datafile fno=00045 name=/dev/rnc32g_38 input datafile fno=00053 name=/dev/rnc32g_8 input datafile fno=00061 name=/dev/rnc32g_16 input datafile fno=00069 name=/dev/rnc32g_64 input datafile fno=00077 name=/dev/rncundo_33g_4 input datafile fno=00085 name=/dev/rnc32g_111 input datafile fno=00093 name=/dev/rnc32g_84 input datafile fno=00101 name=/dev/rnc32g_92 input datafile fno=00109 name=/dev/rnc32g_100 input datafile fno=00117 name=/dev/rnc32g_72 input datafile fno=00006 name=/dev/rnc50_4g_1 channel t13: starting piece 1 at 15-MAY-12 --通道13也尝试备份通道17失败的数据文件 RMAN-03009: failure of backup command on t11 channel at 05/15/2012 04:39:59 ORA-19504: failed to create file "/rman/db_mtnb104u_1_1" ORA-27044: unable to write the header block of file IBM AIX RISC System/6000 Error: 28: No space left on device Additional information: 3 Addition --因为当前没有空闲空间,通道11终止, --这个时候rman异常终止,导致后续的通道13终止记录未打印到日志
阅读完rman日志,很好理解因为存放rman备份的磁盘空间不足导致了一系列错误
检查磁盘剩余空间
Filesystem GB blocks Free %Used Iused %Iused Mounted on /dev/hd4 10.00 9.75 3% 6548 1% / /dev/hd2 10.00 4.55 55% 84383 8% /usr /dev/hd9var 5.00 4.04 20% 6290 1% /var /dev/hd3 5.00 3.87 23% 1551 1% /tmp /dev/hd1 10.00 9.91 1% 382 1% /home /proc - - - - - /proc /dev/hd10opt 5.00 4.89 3% 3502 1% /opt /dev/archalv 99.00 82.98 17% 96 1% /archa /dev/fslv01 40.00 19.49 52% 72324 2% /ora10 /dev/fslv00 1800.00 467.25 75% 10 1% /rman
这下让人迷糊了,磁盘空间还剩余467.25G,怎么会报错呢?
分析原因
RMAN-03009: failure of backup command on t12 channel at 05/15/2012 04:39:58 ORA-19502: write error on file "/rman/db_mmnb04jl_1_1", blockno 30481025 (blocksize=8192) ORA-27063: number of bytes read/written is incorrect IBM AIX RISC System/6000 Error: 28: No space left on device Additional information: -1 Additional information: 1048576 ORA-19502: write error on file "/rman/db_mmnb04jl_1_1", blockno 30480897 (blocksize=8192) ORA-27063: number of bytes read/written is incorrect IBM AIX RISC System/6000 Error: 28: No space left on device channel t12 disabled, job failed on it will be run on another channel RMAN-03009: failure of backup command on t17 channel at 05/15/2012 04:39:58 ORA-19502: write error on file "/rman/db_mrnb04jm_1_1", blockno 30753793 (blocksize=8192) ORA-27063: number of bytes read/written is incorrect IBM AIX RISC System/6000 Error: 28: No space left on device Additional information: -1 Additional information: 1048576 ORA-19502: write error on file "/rman/db_mrnb04jm_1_1", blockno 30753665 (blocksize=8192) ORA-27063: number of bytes read/written is incorrect IBM AIX RISC System/6000 Error: 28: No space left on device channel t17 disabled, job failed on it will be run on another channel
这两个通道在写入rman备份到磁盘中的时候,在05/15/2012 04:39:58发现磁盘空间不足,两个通道分别准备写入30480897/30753665号块的时候出错,那么当时这两个通道分别写入的数据块数为30480896/30753664,写入文件大小为(30480896+30753664)*8192/1024/1024/1024=467.1826171875G.这里可以看出磁盘剩余空间467.25G,其实当时已经写入了467.1826171875G,继续写入的时候出错.然后rman为了保证备份的正确性,自动删除了当时已经备份的467.1826171875G错误的备份文件.从而在备份结束后看到磁盘空间还有大量剩余而rman包空间不足的现象.
记录一次比较棘手数据库恢复要点
在最近的一次数据库异常恢复过程中遇到不少问题,把重点记录下
ORA-00704/ORA-01555错误
Fri May 4 21:04:21 2012 select ctime, mtime, stime from obj$ where obj# = :1 Fri May 4 21:04:21 2012 Errors in file /oracle/admin/standdb/udump/perfdb_ora_1286288.trc: ORA-00704: bootstrap process failure ORA-00704: bootstrap process failure ORA-00604: error occurred at recursive SQL level 1 ORA-01555: snapshot too old: rollback segment number 40 with name "_SYSSMU40$" too small Error 704 happened during db open, shutting down database USER: terminating instance due to error 704 Instance terminated by USER, pid = 1286288 ORA-1092 signalled during: alter database open resetlogs... 这里的提示可以看出obj$基表中有事务存在,查询这个表的时候,要去找40号回滚段中相关数据;通过非常规方法, 查找到40号回滚段的状态是offliine了(这个查询出来的信息和是否使用隐含参数无关). 问题原因,为什么40号回滚段变得offline? Fri May 4 17:36:26 2012 alter tablespace undotbs offline Fri May 4 17:36:26 2012 ORA-1109 signalled during: alter tablespace undotbs offline... Fri May 4 17:37:29 2012 alter database datafile '/dev/rundodbs01' offline drop Fri May 4 17:37:29 2012 Completed: alter database datafile '/dev/rundodbs01' offline drop 因为强制offline 了file# 2文件导致(一个undo表空间文件) 解决方法: 1.bbed提交事务 因为现在生产的trace文件中未有关于obj$ 未提交事务的记录,做10046也为发现该记录,如果要使用bbed修改该事务, 那需要dump obj$相关的数据块(在mount状态下dump),然后找到相关事务,再修改 2.强制让file# 2 online 因为在resetlogs前file#2 已经offline掉了,所以要使得该文件能够成功online,需要先推进scn
ORA-00600[krhpfh_03-1209]
SQL> recover database until cancel; ORA-00283: recovery session canceled due to errors ORA-00600: internal error code, arguments: [krhpfh_03-1209], [2], [782415504], [782428968], [3987078030], [2379], [0], [0] ORA-01110: data file 2: '/dev/rundodbs01' 问题原因: 数据库处于非归档模式下,连续三次resetlogs,引起该bug 解决办法: 重建控制文件 但是这里问题出现了,因为file# 2的resetlogs scn和其他数据文件不一致,导致在file# 2 online的前提下,无法重建. 这样就处在了一个循环中(需要online file# 2 又要重建控制文件),这样的问题,可以通过bbed修改file# 2的resetlogs scn完成 或者先让file# 2 offline(没有加drop)掉,重建控制文件(除掉file# 2的文件记录)
ORA-00600[25025]
SMON: enabling cache recovery Fri May 4 22:36:36 2012 Errors in file /oracle/admin/standdb/udump/perfdb_ora_1167402.trc: ORA-00600: internal error code, arguments: [25025], [2], [], [], [], [], [], [] Fri May 4 22:36:38 2012 Errors in file /oracle/admin/standdb/udump/perfdb_ora_1167402.trc: ORA-00600: internal error code, arguments: [25025], [2], [], [], [], [], [], [] Fri May 4 22:36:38 2012 Error 600 happened during db open, shutting down database USER: terminating instance due to error 600 Instance terminated by USER, pid = 1167402 错误原因: 因为有undo文件不在undo对应的表空间中,而我们的file# 2文件确实是undo文件,而且重建控制文件时候未加入进来 解决办法: undo_management = AUTO undo_tablespace = UNDODBS(file# 2属于该表空间) 修改为 undo_management = MANUAL undo_tablespace = SYSTEM 或者bbed修改file# 2的header,然后重建控制文件
ORA-00600[4137]
Errors in file /oracle/admin/standdb/bdump/perfdb_smon_1290564.trc: ORA-00600: internal error code, arguments: [4137], [], [], [], [], [], [], [] Fri May 4 23:20:52 2012 create undo tablespace undotbs3 datafile '/dev/rundodbs21' size 20400M Fri May 4 23:23:47 2012 Errors in file /oracle/admin/standdb/bdump/perfdb_smon_1290564.trc: ORA-00600: internal error code, arguments: [4137], [], [], [], [], [], [], [] Fri May 4 23:23:48 2012 Errors in file /oracle/admin/standdb/bdump/perfdb_pmon_1520126.trc: ORA-00474: SMON process terminated with error Fri May 4 23:23:48 2012 PMON: terminating instance due to error 474 Instance terminated by PMON, pid = 1520126 错误原因: _smon_internal_errlimit(limit of SMON internal errors) SMON遇到了内部错误,最大允许100次, 不断计数增长,达到100的时候,数据库smon进程自动down掉,从而导致数据库down 解决办法: 1.临时解决办法:设置_smon_internal_errlimit一个较大值 3.根本解决办法:使用undo隐含参数,删除有问题undo 回滚段和undo表空间或者使用10513 事件