1， 数据库日志报错ORA-00327，注意此处有乱码
Errors in file /Oracle/app/oracle/diag/rdbms/tyolap/tyolap3/trace/tyolap3_lgwr_22388.trc:
ORA-00327: 脠脮脮I 31 (脌M戮 3 碌脛): 贸w麓贸脨隆 102400 脡脵矛露脣霉脨猫脪陋碌脛 1048576
ORA-00312: 戮脡脧脠脮脮I 31 脌M戮 3: '+DATA/tyolap/onlinelog/redo31a'
Errors in file /oracle/app/oracle/diag/rdbms/tyolap/tyolap3/trace/tyolap3_lgwr_22388.trc:
ORA-00321: 脠脮脮I 31 (脌M戮 3 碌脛): o路篓赂眉脨脗脠脮脮In脣卯^
ORA-00312: 戮脡脧脠脮脮I 31 脌M戮 3: '+DATA/tyolap/onlinelog/redo31a'
查看报错具体内容，应该是redo文件+DATA/tyolap/onlinelog/redo31a损坏
[oracle@dtydb5 scripts]$ oerr ora 327
00327, 00000, "log %s of thread %s, physical size %s less than needed %s"
// *Cause: A log file has shrunk insize. This is likely
// to have been caused by operator or operating system error.
// *Action: Restore the log file from backup. If backup isnot available,
// drop this log and re-create. If the database was shut down
// cleanly, no further action should be required; otherwise
// incomplete recovery may be required.
[oracle@dtydb5 scripts]$ oerr ora 312
00312, 00000, "online log %s thread %s: '%s'"
// *Cause: This message reports the filename for details of another message.
// *Action: Other messages will accompany this message. See the
// associated messages for the appropriate actionto take.
[oracle@dtydb5 scripts]$ oerr ora 321
00321, 00000, "log %s of thread %s, cannot update log file header"
// *Cause: Cannot write to the log file.
// *Action: Restore the access to the file.
2，进一步查看trc文件，具体原因没看明白，但基本已可以确定是日志文件损坏
DE: Problem Key 'ORA 313' was flood controlled (0x1) (no incident)
ORA-00313: ?????? 31 (???? 3) ?????
ORA-00313: ?????? 31 (???? 3) ?????
DDE rules only execution for: ORA 312
----- START Event Driven Actions Dump ----
---- END Event Driven Actions Dump ----
----- START DDE Actions Dump -----
Executing SYNC actions
----- START DDE Action: 'DB_STRUCTURE_INTEGRITY_CHECK' (Async) -----
DDE Action 'DB_STRUCTURE_INTEGRITY_CHECK' was flood controlled
----- END DDE Action: 'DB_STRUCTURE_INTEGRITY_CHECK' (FLOOD CONTROLLED, 5 csec) -----
Executing ASYNC actions
----- END DDE Actions Dump (total 0 csec) -----
3，查看此redo文件的状态，status为INVALID，另一个为stale，系统还在正常运行中.
31 3 575 2 536,870,912 YES ACTIVE
32 3 576 2 536,870,912 NOCURRENT
GROUP# STATUS TYPE MEMBER IS_
---------- ------- ------- -------------------------------------------------- ---
31 STALE ONLINE +DATA/tyolap/onlinelog/redo31a NO
ONLINE +DATA/tyolap/onlinelog/redo31b NO
32 INVALID ONLINE +DATA/tyolap/onlinelog/redo32a NO
ONLINE +DATA/tyolap/onlinelog/redo32b NO
STATUS VARCHAR2(7) Status of the log member:
INVALID - File is inaccessible
STALE - File's contents are incomplete
DELETED - File isno longer used
null - File isin use
4，日志文件损坏，最简单的方法就是在线重建日志文件了
sys@TYOLAP3(dtydb5)> ALTERDATABASEDROP LOGFILE MEMBER '+DATA/tyolap/onlinelog/redo31a';
数据库已更改。
sys@TYOLAP3(dtydb5)> ALTERDATABASEADD LOGFILE MEMBER '+DATA/tyolap/onlinelog/redo31a'togroup 31;
数据库已更改。
sys@TYOLAP3(dtydb5)> alter system switch logfile;
系统日志恢复正常
GROUP# STATUS TYPE MEMBER IS_
---------- ------- ------- -------------------------------------------------- ---
31 ONLINE +DATA/tyolap/onlinelog/redo31a NO
ONLINE +DATA/tyolap/onlinelog/redo31b NO
32 ONLINE +DATA/tyolap/onlinelog/redo32a NO
ONLINE +DATA/tyolap/onlinelog/redo32b NO
5，系统恢复正常了，但是日志文件损坏的原因还不是特清楚。
