Exact location of control file when db_create_online_log_dest_1 is set

In case in the init.ora file the below three parameters are set
db_create_file_dest =somepath1
db_create_online_log_dest_1 =somepath2
db_create_online_log_dest_2 = somepath3
then in which location will the control files be created? Its an interview question.
Kindly provide me info

Ebenezer_863977 wrote:
In case in the init.ora file the below three parameters are set
db_create_file_dest =somepath1
db_create_online_log_dest_1 =somepath2
db_create_online_log_dest_2 = somepath3
then in which location will the control files be created? Its an interview question.
Kindly provide me info"Its an interview question."
It's also a doc question
http://download.oracle.com/docs/cd/E11882_01/server.112/e25494/omf002.htm#ADMIN11490
http://download.oracle.com/docs/cd/E11882_01/server.112/e25513/initparams052.htm#REFRN10034

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SQL Loader Control file WHEN clause

LOAD DATA
REPLACE
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^
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So how do I use <, <=, > or >= operators in a WHEN clause of a control file can any one help me?
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Thanks for the suggestion but by searching in someother sites i found that
only equality operators ('=', '!=' or '<>') are permited in the WHEN clause expressions of a control file in SQL Loader.
So now i changed my logic.
thanks anyway.

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HI,
Normally we hard code the location of the template in the control file and keep the file at that server location.
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<FONT FACE="verdana" SIZE="2">
You have to hardcode the values like the one below. In this case, even if you clone your instance, it will continue to work.
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Functioning of control file when re-created

Hi friends,
we can recover database without data loss when there is a situation to re-create control file(for suppose control file is lost and no multiplexed copies are available) using NORESETLOGS option in controlfile script.
when we re-create controlfile, no SCN and checkpoint information will be there in controlfile. Then how controlfile will get the latest SCN and how it allows DB to be up and running.
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Hi,
As per my knowledge I am explaning what will happen at Background.
As you said that control File is lost and no mutiplexed, In that scenario you are going to recreate the Controlfile. As we know that control file will be in Sync with All DataFiles (System etc.,) , which will hold the SCN numbers, When the Instance is UP with the newly Created ControlFile (Since scn is not available), it will get the Highest SCN Number from Current DataFiles and Check for in Sync with other Datafiles, whether SCN is in Sync with the Other data files or not.
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Problem in identifying control file when creating physical standby

hi there,
(database version: 10.2.0.4
plateform linux)
I'm using the command as below to create physical standby database from backup:
rman target / auxiliary sys/tiger@paceview
Recovery Manager: Release 10.2.0.4.0 - Production on Tue Sep 4 18:05:53 2012
Copyright (c) 1982, 2007, Oracle. All rights reserved.
connected to target database: PACEVIEW (DBID=2092349485)
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allocated channel: c1
channel c1: sid=35 devtype=DISK
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executing command: SET until clause
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ORA-19601: output file is control file (/PGHProdDB/oradata/paceview/control1.ctl)
failover to previous backup
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released channel: c2
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RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
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RMAN-03015: error occurred in stored script Memory Script
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Hello;
So this is what I would do :
Backup Primary ( change to your directory as need )
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allocate channel d1 type disk;
backup format '/u01/backups/PRIMARY/df_t%t_s%s_p%p' database;
sql 'alter system archive log current';
backup format '/u01/backups/PRIMARY/al_t%t_s%s_p%p' archivelog all;
backup current controlfile for standby format '/u01/backups/PRIMARY/sb_t%t_s%s_p%p';
release channel d1;
}Move the backup and duplicate like this :
rman target sys/password@PRIMARY auxiliary /
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allocate channel C1 device type disk;
allocate auxiliary channel C2 device type disk;
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}For complete details of this method see :
http://www.visi.com/~mseberg/duprman2.html
Best Regards
mseberg

Remove the current control file when the database is running on linux or un

Question From Oracler:
下面这个例子中，假如controlfile被删除掉了，instance还没有关闭，可以通过lsof找出controlfile的file descriptors,再通过dd把文件恢复过来...
我觉得这样dd出来的控制文件是没有办法直接启动这个数据库的，因为CKPT每3S一次，你dd恢复出来的控制文件SCN肯定和datafile不一样，比datafile小，... 要是recover会提示控制文件太久，不知道我理解正不正确啊？
http://www.oracledatabase12g.com/archives/unix-linux%e4%b8%8b%e5%88%a0%e9%99%a4oracle%e6%8e%a7%e5%88%b6%e6%96%87%e4%bb%b6controlfile%e4%b8%ba%e4%bb%80%e4%b9%88%e5%ae%9e%e4%be%8binstance%e6%b2%a1%e6%9c%89%e7%ab%8b%e5%8d%b3%e5%a5%94%e6%ba%83.html
dd恢复的控制文件怎么会比打他file、
怎么会比datafile的scn 小呢
一旦关库，那么fd是不是就消失了，没有办法dd了，那么造成scn不相同的原因是dd过程中scn的变化么？
还请大致谈一下造成scn更新的必要条件。

有网友提问，若控制文件是 create controlfile 重建得来的又会如何？这里我们可以看一下：
我们来看一下：
SQL> alter system switch logfile;
System altered.
SQL> select distinct checkpoint_change# from v$datafile_header;
CHECKPOINT_CHANGE#
15169797
SQL> alter system checkpoint;
System altered.
SQL> select distinct checkpoint_change# from v$datafile_header;
CHECKPOINT_CHANGE#
15169802 =>E7783A
15169802 =>E7783A 最近的一次FULL CHECKPOINT的SCN
SQL> select name from v$tablespace;
NAME
SYSTEM
UNDOTBS1
SYSAUX
USERS
EXAMPLE
TEMP
SQL> alter tablespace SYSTEM begin backup;
Tablespace altered.
SQL> alter tablespace UNDOTBS1 begin backup;
Tablespace altered.
SQL> alter tablespace SYSAUX begin backup;
Tablespace altered.
SQL> alter tablespace USERS begin backup;
Tablespace altered.
SQL> alter tablespace EXAMPLE begin backup;
Tablespace altered.
SQL> alter tablespace SYSTEM end backup;
Tablespace altered.
SQL> alter tablespace UNDOTBS1 end backup;
Tablespace altered.
SQL> alter tablespace SYSAUX end backup;
Tablespace altered.
SQL> alter tablespace USERS end backup;
Tablespace altered.
SQL> alter tablespace EXAMPLE end backup;
Tablespace altered.
begin /end backup 会引发FILE CHECKPOINT ，造成datafile_header的 checkpoint_change# 更新
SQL> select distinct checkpoint_change# from v$datafile_header;
CHECKPOINT_CHANGE#
15169814
15169827
15169842
15169821
15169835
15169814 =>E77916 是最小的一个 datafile header checkpoint_change#
SQL> oradebug setmypid;
Statement processed.
SQL> oradebug dump controlf 3;
Statement processed.
SQL> oradebug tracefile_name;
但是此时去dump controlf 可以发现控制文件中的database checkpint 仍是 E7783A 15169802 即上一次FULL CHECKPOINT的 SCN
DATABASE ENTRY
(size = 316, compat size = 316, section max = 1, section in-use = 1,
last-recid= 0, old-recno = 0, last-recno = 0)
(extent = 1, blkno = 1, numrecs = 1)
03/09/2012 23:04:33
DB Name "G10R21"
Database flags = 0x00404001 0x00001000
Controlfile Creation Timestamp 03/09/2012 23:04:33
Incmplt recovery scn: 0x0000.00000000
Resetlogs scn: 0x0000.00e7784f Resetlogs Timestamp 03/09/2012 23:11:46
Prior resetlogs scn: 0x0000.00e77780 Prior resetlogs Timestamp 03/09/2012 22:57:44
Redo Version: compatible=0xa200100
#Data files = 16, #Online files = 16
Database checkpoint: Thread=1 scn: 0x0000.00e7790a ==>15169802
Threads: #Enabled=1, #Open=1, Head=1, Tail=1
REDO THREAD RECORDS
(size = 256, compat size = 256, section max = 8, section in-use = 1,
last-recid= 0, old-recno = 0, last-recno = 0)
(extent = 1, blkno = 9, numrecs = 8)
THREAD #1 - status:0xf thread links forward:0 back:0
#logs:3 first:1 last:3 current:2 last used seq#:0x2
enabled at scn: 0x0000.00e7784f 03/09/2012 23:11:46
disabled at scn: 0x0000.00000000 01/01/1988 00:00:00
opened at 03/09/2012 23:11:46 by instance G10R21
Checkpointed at scn: 0x0000.00e7790a 03/09/2012 23:12:12
thread:1 rba:(0x2.3.10)
SQL> alter database backup controlfile to trace;
Database altered.
SQL> oradebug setmypid;
Statement processed.
SQL> oradebug tracefile_name;
SQL> shutdown abort;
ORACLE instance shut down.
[oracle@vrh8 ~]$ rm /s01/recreate.ctl
我们以NORESETLOGS重建控制文件:
SQL> startup nomount;
ORACLE instance started.
Total System Global Area 620756992 bytes
Fixed Size 2022760 bytes
Variable Size 234881688 bytes
Database Buffers 377487360 bytes
Redo Buffers 6365184 bytes
SQL> show parameter control
NAME TYPE VALUE
control_file_record_keep_time integer 7
control_files string /s01/recreate.ctl
SQL> CREATE CONTROLFILE REUSE DATABASE "G10R21" NORESETLOGS ARCHIVELOG
2 MAXLOGFILES 16
3 MAXLOGMEMBERS 3
4 MAXDATAFILES 100
5 MAXINSTANCES 8
6 MAXLOGHISTORY 2921
7 LOGFILE
8 GROUP 1 (
9 '/s01/oradata/G10R21/onlinelog/o1_mf_1_7ch812dg_.log',
10 '/s01/flash_recovery_area/G10R21/onlinelog/o1_mf_1_7ch813h5_.log'
11 ) SIZE 50M,
12 GROUP 2 (
13 '/s01/oradata/G10R21/onlinelog/o1_mf_2_7ch8144q_.log',
14 '/s01/flash_recovery_area/G10R21/onlinelog/o1_mf_2_7ch815cj_.log'
15 ) SIZE 50M,
16 GROUP 3 (
17 '/s01/oradata/G10R21/onlinelog/o1_mf_3_7ch816g2_.log',
18 '/s01/flash_recovery_area/G10R21/onlinelog/o1_mf_3_7ch817gp_.log'
19 ) SIZE 50M
20 -- STANDBY LOGFILE
DATAFILE
21 22 '/s01/oradata/G10R21/datafile/o1_mf_system_7ch8004t_.dbf',
23 '/s01/oradata/G10R21/datafile/o1_mf_undotbs1_7ch80081_.dbf',
24 '/s01/oradata/G10R21/datafile/o1_mf_sysaux_7ch8004x_.dbf',
25 '/s01/oradata/G10R21/datafile/o1_mf_users_7ch80085_.dbf',
26 '/s01/oradata/G10R21/datafile/o1_mf_example_7ch81ch3_.dbf',
27 '/s01/oradata/G10R21/datafile/o1_mf_users_7gvd5pwh_.dbf',
28 '/s01/oradata/G10R21/datafile/o1_mf_users_7h6t6fdt_.dbf',
29 '/s01/oradata/G10R21/datafile/o1_mf_users_7h6t6nxy_.dbf',
30 '/s01/oradata/G10R21/datafile/o1_mf_users_7h6t6qc2_.dbf',
31 '/s01/oradata/G10R21/datafile/o1_mf_users_7h6t6stt_.dbf',
32 '/s01/oradata/G10R21/datafile/o1_mf_users_7h6t6w5w_.dbf',
33 '/s01/oradata/G10R21/datafile/o1_mf_users_7h6t6yo0_.dbf',
34 '/s01/oradata/G10R21/datafile/o1_mf_users_7h6t717x_.dbf',
35 '/s01/oradata/G10R21/datafile/o1_mf_undotbs1_7h6ttkkx_.dbf',
36 '/s01/oradata/G10R21/datafile/o1_mf_undotbs1_7h6ttpn1_.dbf',
37 '/s01/oradata/G10R21/datafile/o1_mf_undotbs1_7h6ttsbd_.dbf'
38 CHARACTER SET AL32UTF8;
Control file created.
SQL> oradebug setmypid;
Statement processed.
SQL> oradebug dump controlf 3;
Statement processed.
DATABASE ENTRY
(size = 316, compat size = 316, section max = 1, section in-use = 1,
last-recid= 0, old-recno = 0, last-recno = 0)
(extent = 1, blkno = 1, numrecs = 1)
03/09/2012 23:16:57
DB Name "G10R21"
Database flags = 0x00400103 0x00001000
Controlfile Creation Timestamp 03/09/2012 23:16:58
Incmplt recovery scn: 0x0000.00000000
Resetlogs scn: 0x0000.00e7784f Resetlogs Timestamp 03/09/2012 23:11:46
Prior resetlogs scn: 0x0000.00e77780 Prior resetlogs Timestamp 03/09/2012 22:57:44
Redo Version: compatible=0xa200100
#Data files = 16, #Online files = 16
Database checkpoint: Thread=1 scn: 0x0000.00e77902 15169794
Threads: #Enabled=1, #Open=1, Head=1, Tail=1
Database checkpoint: 变成了 00e77902 =》 15169794，比上次FULL CHECKPOINT的15169802 还要小
这个
00e77902 =》 15169794从哪里来？
REDO THREAD RECORDS
(size = 256, compat size = 256, section max = 8, section in-use = 1,
last-recid= 0, old-recno = 0, last-recno = 0)
(extent = 1, blkno = 9, numrecs = 8)
THREAD #1 - status:0x7 thread links forward:0 back:0
#logs:3 first:1 last:3 current:2 last used seq#:0x2
enabled at scn: 0x0000.00e7784f 03/09/2012 23:11:46
disabled at scn: 0x0000.00000000 01/01/1988 00:00:00
opened at 01/01/1988 00:00:00 by instance
Checkpointed at scn: 0x0000.00e77902 03/09/2012 23:11:54
thread:1 rba:(0x2.2.0)
LOG FILE RECORDS
(size = 72, compat size = 72, section max = 16, section in-use = 3,
last-recid= 0, old-recno = 0, last-recno = 0)
(extent = 1, blkno = 10, numrecs = 16)
LOG FILE #1:
(name #3) /s01/oradata/G10R21/onlinelog/o1_mf_1_7ch812dg_.log
(name #4) /s01/flash_recovery_area/G10R21/onlinelog/o1_mf_1_7ch813h5_.log
Thread 1 redo log links: forward: 2 backward: 0
siz: 0x19000 seq: 0x00000001 hws: 0x4 bsz: 512 nab: 0xb6 flg: 0x0 dup: 2
Archive links: fwrd: 2 back: 0 Prev scn: 0x0000.00000000
Low scn: 0x0000.00e7784f 03/09/2012 23:11:46
Next scn: 0x0000.00e77902 03/09/2012 23:11:54
LOG FILE #2:
(name #1) /s01/oradata/G10R21/onlinelog/o1_mf_2_7ch8144q_.log
(name #2) /s01/flash_recovery_area/G10R21/onlinelog/o1_mf_2_7ch815cj_.log
Thread 1 redo log links: forward: 3 backward: 1
siz: 0x19000 seq: 0x00000002 hws: 0x1 bsz: 512 nab: 0xffffffff flg: 0xa dup: 2
Archive links: fwrd: 0 back: 1 Prev scn: 0x0000.00e7784f
Low scn: 0x0000.00e77902 03/09/2012 23:11:54
Next scn: 0xffff.ffffffff 01/01/1988 00:00:00
LOG FILE #3:
(name #5) /s01/oradata/G10R21/onlinelog/o1_mf_3_7ch816g2_.log
(name #6) /s01/flash_recovery_area/G10R21/onlinelog/o1_mf_3_7ch817gp_.log
Thread 1 redo log links: forward: 0 backward: 2
siz: 0x19000 seq: 0x00000000 hws: 0x2 bsz: 512 nab: 0x2 flg: 0x1 dup: 2
Archive links: fwrd: 0 back: 0 Prev scn: 0x0000.00000000
Low scn: 0x0000.00000000 01/01/1988 00:00:00
Next scn: 0x0000.00000000 01/01/1988 00:00:00
原来这个
00e77902 =》 15169794 来源于 current online redo logfile中最小的LOW SCN
DATA FILE RECORDS
(size = 428, compat size = 428, section max = 100, section in-use = 19,
last-recid= 0, old-recno = 0, last-recno = 0)
(extent = 1, blkno = 11, numrecs = 100)
DATA FILE #1:
(name #22) /s01/oradata/G10R21/datafile/o1_mf_system_7ch8004t_.dbf
creation size=0 block size=8192 status=0x12 head=22 tail=22 dup=1
tablespace 0, index=1 krfil=1 prev_file=0
unrecoverable scn: 0x0000.00000000 01/01/1988 00:00:00
Checkpoint cnt:2314 scn: 0x0000.00e77916 03/09/2012 23:12:46
Stop scn: 0xffff.ffffffff 03/09/2012 23:16:58
Creation Checkpointed at scn: 0x0000.00000008 10/22/2005 21:44:31
thread:0 rba:(0x0.0.0)
DATAFILE 1 的checkpoint scn最小为 00e77916 =》15169814
SQL> recover database using backup controlfile;
ORA-00279: change 15169814 generated at 03/09/2012 23:12:46 needed for thread 1
ORA-00289: suggestion :
/s01/flash_recovery_area/G10R21/archivelog/2012_03_09/o1_mf_1_2_%u_.arc
ORA-00280: change 15169814 for thread 1 is in sequence #2
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
ORA-00279: change 15169814 generated at 03/09/2012 23:12:46 needed for thread 1
可以看到 recover database using backup controlfile 的起点是 15169814 即最小的一个 datafile header 的CHECKPOINT CHANGE#，
也就是说丢失控制文件并(create controlfile)重建后的recover 从最小的datafile header CHECKPOINT_CHANGE#开始，直到NEXT SCN 无穷大的 current logfile的 end 为止!
我们在看一下 RESETLOGS的情况：
SQL>
SQL> CREATE CONTROLFILE REUSE DATABASE "G10R21" RESETLOGS ARCHIVELOG
MAXLOGFILES 16
2 3 MAXLOGMEMBERS 3
4 MAXDATAFILES 100
5 MAXINSTANCES 8
6 MAXLOGHISTORY 2921
7 LOGFILE
8 GROUP 1 (
9 '/s01/oradata/G10R21/onlinelog/o1_mf_1_7ch812dg_.log',
10 '/s01/flash_recovery_area/G10R21/onlinelog/o1_mf_1_7ch813h5_.log'
11 ) SIZE 50M,
12 GROUP 2 (
13 '/s01/oradata/G10R21/onlinelog/o1_mf_2_7ch8144q_.log',
14 '/s01/flash_recovery_area/G10R21/onlinelog/o1_mf_2_7ch815cj_.log'
15 ) SIZE 50M,
16 GROUP 3 (
17 '/s01/oradata/G10R21/onlinelog/o1_mf_3_7ch816g2_.log',
18 '/s01/flash_recovery_area/G10R21/onlinelog/o1_mf_3_7ch817gp_.log'
19 ) SIZE 50M
20 -- STANDBY LOGFILE
21 DATAFILE
22 '/s01/oradata/G10R21/datafile/o1_mf_system_7ch8004t_.dbf',
23 '/s01/oradata/G10R21/datafile/o1_mf_undotbs1_7ch80081_.dbf',
'/s01/oradata/G10R21/datafile/o1_mf_sysaux_7ch8004x_.dbf',
24 25 '/s01/oradata/G10R21/datafile/o1_mf_users_7ch80085_.dbf',
26 '/s01/oradata/G10R21/datafile/o1_mf_example_7ch81ch3_.dbf',
27 '/s01/oradata/G10R21/datafile/o1_mf_users_7gvd5pwh_.dbf',
28 '/s01/oradata/G10R21/datafile/o1_mf_users_7h6t6fdt_.dbf',
29 '/s01/oradata/G10R21/datafile/o1_mf_users_7h6t6nxy_.dbf',
30 '/s01/oradata/G10R21/datafile/o1_mf_users_7h6t6qc2_.dbf',
31 '/s01/oradata/G10R21/datafile/o1_mf_users_7h6t6stt_.dbf',
32 '/s01/oradata/G10R21/datafile/o1_mf_users_7h6t6w5w_.dbf',
33 '/s01/oradata/G10R21/datafile/o1_mf_users_7h6t6yo0_.dbf',
34 '/s01/oradata/G10R21/datafile/o1_mf_users_7h6t717x_.dbf',
35 '/s01/oradata/G10R21/datafile/o1_mf_undotbs1_7h6ttkkx_.dbf',
36 '/s01/oradata/G10R21/datafile/o1_mf_undotbs1_7h6ttpn1_.dbf',
37 '/s01/oradata/G10R21/datafile/o1_mf_undotbs1_7h6ttsbd_.dbf'
CHARACTER SET AL32UTF8; 38
Control file created.
SQL> oradebug setmypid;
Statement processed.
SQL> oradebug dump controlf 3;
Statement processed.
SQL> oradebug tracefile_name;
DATABASE ENTRY
(size = 316, compat size = 316, section max = 1, section in-use = 1,
last-recid= 0, old-recno = 0, last-recno = 0)
(extent = 1, blkno = 1, numrecs = 1)
03/09/2012 23:20:03
DB Name "G10R21"
Database flags = 0x00400147 0x00001000
Controlfile Creation Timestamp 03/09/2012 23:20:03
Incmplt recovery scn: 0x0000.00e77932
Resetlogs scn: 0x0000.00e7784f Resetlogs Timestamp 03/09/2012 23:11:46
Prior resetlogs scn: 0x0000.00e77780 Prior resetlogs Timestamp 03/09/2012 22:57:44
Redo Version: compatible=0xa200100
#Data files = 16, #Online files = 16
Database checkpoint: Thread=0 scn: 0x0000.00000000
Threads: #Enabled=1, #Open=0, Head=0, Tail=0
REDO THREAD RECORDS
(size = 256, compat size = 256, section max = 8, section in-use = 1,
last-recid= 0, old-recno = 0, last-recno = 0)
(extent = 1, blkno = 9, numrecs = 8)
THREAD #1 - status:0x6 thread links forward:0 back:0
#logs:3 first:1 last:3 current:3 last used seq#:0x0
enabled at scn: 0x0000.00000000 01/01/1988 00:00:00
disabled at scn: 0x0000.00000000 01/01/1988 00:00:00
opened at 01/01/1988 00:00:00 by instance
Checkpointed at scn: 0x0000.00000000
thread:0 rba:(0x0.0.0)
LOG FILE RECORDS
(size = 72, compat size = 72, section max = 16, section in-use = 3,
last-recid= 0, old-recno = 0, last-recno = 0)
(extent = 1, blkno = 10, numrecs = 16)
LOG FILE #1:
(name #5) /s01/oradata/G10R21/onlinelog/o1_mf_1_7ch812dg_.log
(name #6) /s01/flash_recovery_area/G10R21/onlinelog/o1_mf_1_7ch813h5_.log
Thread 1 redo log links: forward: 2 backward: 0
siz: 0x19000 seq: 0x00000000 hws: 0x0 bsz: 512 nab: 0x0 flg: 0x1 dup: 2
Archive links: fwrd: 0 back: 0 Prev scn: 0x0000.00000000
Low scn: 0x0000.00000000 01/01/1988 00:00:00
Next scn: 0x0000.00000000 01/01/1988 00:00:00
LOG FILE #2:
(name #3) /s01/oradata/G10R21/onlinelog/o1_mf_2_7ch8144q_.log
(name #4) /s01/flash_recovery_area/G10R21/onlinelog/o1_mf_2_7ch815cj_.log
Thread 1 redo log links: forward: 3 backward: 1
siz: 0x19000 seq: 0x00000000 hws: 0x0 bsz: 512 nab: 0x0 flg: 0x1 dup: 2
Archive links: fwrd: 0 back: 0 Prev scn: 0x0000.00000000
Low scn: 0x0000.00000000 01/01/1988 00:00:00
Next scn: 0x0000.00000000 01/01/1988 00:00:00
LOG FILE #3:
(name #1) /s01/oradata/G10R21/onlinelog/o1_mf_3_7ch816g2_.log
(name #2) /s01/flash_recovery_area/G10R21/onlinelog/o1_mf_3_7ch817gp_.log
Thread 1 redo log links: forward: 0 backward: 2
siz: 0x19000 seq: 0x00000000 hws: 0x0 bsz: 512 nab: 0x2 flg: 0xb dup: 2
Archive links: fwrd: 0 back: 0 Prev scn: 0x0000.00000000
Low scn: 0x0000.00000000 01/01/1988 00:00:00
Next scn: 0x0000.00000000 01/01/1988 00:00:00
虽然database checkpoint scn 等都是0 ，但是不影响从最小的datafile header checkpoint change 开始recover的结论。
SQL> recover database using backup controlfile;
ORA-00279: change 15169814 generated at 03/09/2012 23:12:46 needed for thread 1
ORA-00289: suggestion :
/s01/flash_recovery_area/G10R21/archivelog/2012_03_09/o1_mf_1_2_%u_.arc
ORA-00280: change 15169814 for thread 1 is in sequence #2
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}

Sqlloader control file when clause

Problem 1
Lets say, I have a table x with (f1 number(2), f2 varchar(14), f3 Number(1))
datafile1
10,ls
22,st
45,tanveer
77,cool
1,not cool
requirement is to insert the first 2 columns in f1 and f2 and insert 0 in f3 only
if f2 == tanveer
Problem 2
Table is y (f4 number (2), f5 varchar (16))
datafile2
ls,xxxx
tanveer,yyyy
cool,zzzz
not cool, mmmm
given the value of the first coloumn I would like to query table x
and find the corresponding value of f1 insert it to table y's column f4
and associated string to f5.
Please let me know how to write the control files for sqlloader.

Problem 1:
-- control file:
LOAD DATA
INFILE 'DATAFILE1.DAT'
APPEND
INTO TABLE x
FIELDS TERMINATED BY ','
TRAILING NULLCOLS
(f1, f2,
f3 "DECODE (:f2, 'tanveer', 0, NULL)")
Problem 2:
Create another table z,
load the data into z,
insert into y selecting
from join of x and z:
-- create staging table:
CREATE TABLE z
(f6 VARCHAR2 (14),
f7 VARCHAR2 (16));
-- control file:
LOAD DATA
INFILE 'DATFILE2.DAT'
APPEND
INTO TABLE z
FIELDS TERMINATED BY ','
TRAILING NULLCOLS
(f6, f7)
-- insert:
INSERT INTO y (f4, f5)
SELECT x.f1, z.f7
FROM x, z
WHERE z.f6 = x.f2;

Why can't itunes locate my music files when they are there?

I think that this happened when I checked off both "keep iTunes media folder organized" and "copy files to iTunes Media Folder when adding to library."I had all of my files located at C:\Users\Beata\Music\iTunes\iTunes Media and then I noticed that itunes made folders for all of of my music files because I have checked off the keep iTunes media folder organized. Ever since then, itunes can't find all of my files but only some of it and I don't want to go one by one to locate all of the songs. All of my songs are located in the same location which is C:\Users\Beata\Music\iTunes\iTunes Media\Music I changed it to this location because all of my song files are located there and the place where it was located before, I didn't find the song files on there. I also noticed that itunes would oragize and create folders for my songs in the my music library and I thought that was the reason why itunes couldn't find the files because they were in the wrong location so I moved all of those folders to C:\Users\Beata\Music\iTunes\iTunes Media\Music So, is it because all of my files are in folders since itunes organized them? All of my files are in album, artist, and song title folders. Where should all of these folders be located at? Also, iTunes creates multiple folders that have the same name and should I just leave the folders be or organize them myself because I have folders that have the same exact name as in the artist and title but it has different song files in the folders. Should I combine the files into the same folder that have the same artist or should I just leave it that way? Please ,I really need help as I have tried almost everything.

Help iTunes locate your media folder:
No content shows up in iTunes after updating
http://support.apple.com/kb/TS1967

Physical location of hyperlinked files when generating printed documentation from webhelp project

Hi,
I produce webhelp and the customers have requested that printed documentation is also generated from my help project so that they can have an electronic/paper version.
I have several hyperlinks in the help project, to PDF/Word files, and have found that in the printed documentation, when you click on the hyperlink, it is trying to find the document in the physical location from which the help project was created. This means that the hyperlinked documents only open on my PC because I own the physical location. Other users, particuarly our customers, end up with an error message because it is trying to find a location they do not have access to.
Does anybody know a solution to this please?

The problem with links inside PDF / Word files is that you have no control over where the files reside. Therefore you can't specify a path that will work as it depends on the physical file's location. What you could do is publish the PDFs / Word files to an online location that are accessible by a URL.

How do I locate a missing file when trying to update Itunes

I have tried to update my Itunes but get a messaage that the file Boinjour.msi is missing. I saved the updated file and tried to install it manually but now it tells me that it can't remove the old version of Bonjour.msi.

Hi Lfarhood,
Thanks for visiting Apple Support Communities.
If you're having trouble with a component of iTunes, I'd suggest removing and reinstalling the application. This article has steps and troubleshooting information that can be helpful:
Trouble installing iTunes or QuickTime for Windows
http://support.apple.com/kb/HT1926
Best Regards,
Jeremy

OM-D: how to view entire 4:3 RAW file when aspect ratio set in-camera to 3:2?

When shooting RAW, the OM-D records 4:3 files no matter what the aspect ratio is set to. If you set it to 3:2 (for example), the camera records some sort of metadata to communicate this information to Lightroom, which honors the setting. So far, so good.
My question is, is there any way to override that setting? I have a photo shot at 3:2, but I can see from the in-camera preview that it'd be a better shot with the whole thing. But I can't figure out how to get LR 4.1rc2 to show me the whole thing!
Thanks,
Ben

Unfortunately, there is no way in LR directly. You may be able to restore the settings directly in the raw file using exiftool (tags "aspectratio" and "aspectframe", there are instructions in some forums I think), but it is generally not advisable to manipulate original raws that way (at least, a backup should be made).
See also:
http://feedback.photoshop.com/photoshop_family/topics/lightroom_4_1_rc_trouble_with_canon_ 5d_mark_iii_aspect_ratio
http://feedback.photoshop.com/photoshop_family/topics/importing_orf_files_does_not_import_ all_image_area

Default location of control trace file

hi all
when i want to issue :
SQL>alter database backup controlfile to trace;
command execute without error
but when i open "D:\oracle\product\10.2.0\admin\orcl\udump"
there is no any file related to trace control file ,inside this directry .
when i issue :
select c.value || '/' || instance || '_ora_' ||
ltrim(to_char(a.spid,'fm99999')) || '.trc'
from v$process a, v$session b, v$parameter c, v$thread c
where a.addr = b.paddr
and b.audsid = userenv('sessionid')
and c.name = 'user_dump_dest'
output of above query is :
D:\ORACLE\PRODUCT\10.2.0\ADMIN\ORCL\UDUMP/orcl_ora_2072.trc
but i dont find this file ..........

>
but still i m not able to find related to trace control file
,when i issue "alter database backup controlfile to trace"Check here
http://www.adp-gmbh.ch/ora/sql/alter_database.html (with examples!!!)
I'm guessing that your file is there somewhere, you're just looking in the wrong place - maybe
in the SQL*Plus bin directory or the oracle bin directory? Do a search!
Anyway, just reissue the command using the syntax at the wesite
posted - please tell us how you got on!!
HTH.
Paul...
When asking database related questions, please give other posters
some clues, like OS (with version), version of Oracle being used and DDL.
Other trivia such as CPU, RAM + Disk configuration might also be useful.
The exact text and/or number of error messages is useful (!= "it didn't work!"). Thanks.
Furthermore, as a courtesy to those who spend time analysing and attempting to help,
please do not top post and do try to trim your replies!

Location of Redo log and control files?

Dear all,
I am checking the location of redo log and control files, but found that the redo log file (like log02a.dbf ....) in the same directory of data files. However, I couldn't find any control files in the data files directries.
What could be the location of control files?
Amy

select name
from v$controlfile
or
show parameter control_filesKhurram

Exact location of control file when db_create_online_log_dest_1 is set

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