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redolog大量生成的诊断处理流程

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Release： 2016-06-07 16:10:30
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1.获得归档日志暴增时段的一个归档日志：可以查询v$archived_log视图，结合completion_time列进行定位 2.对该归档日志进行转储dump ALTER SYSTEM DUMP LOGFILE /u01/oracle/V7323/dbs/arch1_76.dbf; --请将路径修改成当时的redo归档的路径 以上命令会在user_


1.获得归档日志暴增时段的一个归档日志：可以查询v$archived_log视图，结合completion_time列进行定位
2.对该归档日志进行转储dump 
  ALTER SYSTEM DUMP LOGFILE '/u01/oracle/V7323/dbs/arch1_76.dbf';
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--请将路径修改成当时的redo归档的路径

以上命令会在user_dump_dest中生成一个trace文件，请将该trace文件传到linux中（root用户or oracle用户均可）

3.
[root@hosta ~]# grep -A2 "^REDO RECORD" his_ora_29032886_dump_arch.trc > redo.log
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4.
[root@hosta ~]# grep OBJ: redo.log |awk -F "OBJ:" '{print $2}'|awk '{print $1}'|sort -n|uniq -c |sort -n -r
2038012 4294967295  <----出现了2038012次。
    107 60635
     60 60464
     30 59848
     29 62992
     29 60669
      9 59810
      8 60706
      8 59842
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OBJ：4294967295，这个是undo的redo记录，出现了2038012次，也就是说：产生redo最多的为undo操作
[root@hosta ~]# grep OBJ: redo.log |awk -F "OBJ:" &#39;{print $2}&#39; | more
4294967295 SCN:0x0001.96090e1b SEQ:  1 OP:5.2
4294967295 SCN:0x0001.96090e1e SEQ:  1 OP:5.4
4294967295 SCN:0x0001.96090e1f SEQ:  1 OP:5.2
4294967295 SCN:0x0001.96090e20 SEQ:  1 OP:5.4
4294967295 SCN:0x0001.96090e21 SEQ:  1 OP:5.2
4294967295 SCN:0x0001.96090e22 SEQ:  1 OP:5.4
4294967295 SCN:0x0001.96090e23 SEQ:  1 OP:5.2
4294967295 SCN:0x0001.96090e24 SEQ:  1 OP:5.4
4294967295 SCN:0x0001.96090e25 SEQ:  1 OP:5.2
4294967295 SCN:0x0001.96090e26 SEQ:  1 OP:5.4
4294967295 SCN:0x0001.96090e27 SEQ:  1 OP:5.2
4294967295 SCN:0x0001.96090e28 SEQ:  1 OP:5.4
4294967295 SCN:0x0001.96090e29 SEQ:  1 OP:5.2
4294967295 SCN:0x0001.96090e29 SEQ:  2 OP:5.4
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注意上面的最后一列：op，这是操作的标志码

OP:5.2 Undo Header
OP:5.4 Commit
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5.
[root@hosta ~]# grep -A2 "^CHANGE #" his_ora_29032886_dump_arch.trc > redo_c.log
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6.
[root@hosta ~]# grep OBJ: redo_c.log |awk -F "OBJ:" &#39;{print $2}&#39;|awk &#39;{print $1}&#39;|sort -n|uniq -c |sort -n -r
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---这是对object_id按照出现的次数进行倒序排列，举例：
[root@hosta ~]# grep OBJ: redo_c.log |awk -F "OBJ:" &#39;{print $2}&#39;|awk &#39;{print $1}&#39;|sort -n|uniq -c |sort -n -r
3057384 4294967295
1018128 15
    279 60669
    174 60635
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这是说明：OBJ：4294967295 出现了3057384次；
OBJ：15 出现了1018128次。
OBJ：4294967295，这个是undo的redo记录.
OBJ：15,可以用如下的语句查询出来：select object_name from dba_objects where object_id='15';
以上就可以定位到是哪个object_name 导致的redo log暴增。

下面来确认一下，是何种操作导致的redo log暴增：
[root@hosta ~]# grep OBJ: redo_c.log | more
CHANGE #1 TYP:0 CLS:15 AFN:1 DBA:0x00400009 OBJ:4294967295 SCN:0x0001.96090e1b SEQ:  1 OP:5.2
CHANGE #2 TYP:0 CLS:16 AFN:1 DBA:0x0040000a OBJ:4294967295 SCN:0x0001.96090e1a SEQ:  1 OP:5.1
CHANGE #3 TYP:2 CLS: 1 AFN:1 DBA:0x0040006a OBJ:15 SCN:0x0001.96090e1b SEQ:  1 OP:11.5
CHANGE #1 TYP:0 CLS:15 AFN:1 DBA:0x00400009 OBJ:4294967295 SCN:0x0001.96090e1e SEQ:  1 OP:5.4
CHANGE #1 TYP:0 CLS:15 AFN:1 DBA:0x00400009 OBJ:4294967295 SCN:0x0001.96090e1f SEQ:  1 OP:5.2
CHANGE #2 TYP:0 CLS:16 AFN:1 DBA:0x0040000a OBJ:4294967295 SCN:0x0001.96090e1e SEQ:  1 OP:5.1
CHANGE #3 TYP:2 CLS: 1 AFN:1 DBA:0x0040006a OBJ:15 SCN:0x0001.96090e1f SEQ:  1 OP:11.5
CHANGE #1 TYP:0 CLS:15 AFN:1 DBA:0x00400009 OBJ:4294967295 SCN:0x0001.96090e20 SEQ:  1 OP:5.4
CHANGE #1 TYP:0 CLS:15 AFN:1 DBA:0x00400009 OBJ:4294967295 SCN:0x0001.96090e21 SEQ:  1 OP:5.2
CHANGE #2 TYP:0 CLS:16 AFN:1 DBA:0x0040000a OBJ:4294967295 SCN:0x0001.96090e20 SEQ:  1 OP:5.1
CHANGE #3 TYP:2 CLS: 1 AFN:1 DBA:0x0040006a OBJ:15 SCN:0x0001.96090e21 SEQ:  1 OP:11.5
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注意上面的最后一列：op，这是操作的标志码

OP:5.1 Undo Recorder
OP:5.2 Undo Header
OP:5.4 Commit
OP:11.5 Update Row Piece,也就是update操作，根据obj:15,就能确认是哪个对象上的update
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redolog deal with Archive process generate get diagnosis
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