How to change the redo log file location.... ?

I want all my redo log files to be created in \u10 instead of current /u01?
How to do it? NOARCHIVELOG mode database on Oracle 10g R2.
Thank you,
Smirh

Hi..
I want all my redo log files to be created in \u10 instead of current /u01?I think it should be /u10 :)...
Anand
Edited by: Anand... on Nov 5, 2009 5:32 AM Removed the misinformation about downtime

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How to remove a redo log file

Hi Experts,
I want to remove a wrong redo log file from 10G R2 database in window.
how to do that without loss data?
my steps as
1. alter system switch logfile;
2. select * from v$log;
which ARC and sataus do I can drop redo log file based on above SQL
no archive and active status?
ALso Which account should I do above action?
fExamp, system account added redo log file, i only
can drop by system? how about sys?
Thanks help in detail steps
Jim
Edited by: user589812 on Dec 23, 2008 4:35 PM

Jim,
Check this link out for how to drop a redo log file
Make sure a redo log group is archived (if archiving is enabled) before dropping it. To see whether this has happened, use the V$LOG view.
http://download.oracle.com/docs/cd/B19306_01/server.102/b14231/onlineredo.htm#i1006489
SELECT GROUP#, ARCHIVED, STATUS FROM V$LOG;
   GROUP# ARC STATUS
        1 YES ACTIVE
        2 NO CURRENT
        3 YES INACTIVE
        4 YES INACTIVE
Drop a redo log group with the SQL statement ALTER DATABASE with the DROP LOGFILE clause.
The following statement drops redo log group number 3:
ALTER DATABASE DROP LOGFILE GROUP 3;

Cannot shrink log file 2 because the logical log file located at the end of the file is in use ?

HI,
I am getting this error frequently.. any recomendations :
Executed as user: DB0\sqlservices. Processing database: dbin [SQLSTATE 01000] (Message 0)
Cannot shrink log file 2 (DB_log) because the logical log file located at the end of the file is in use. [SQLSTATE 01000] (Message 9008)
Processing database: DB_ [SQLSTATE 01000] (Message 0) DBCC execution completed. If DBCC printed error messages, contact your system administrator. [SQLSTATE 01000] (Message 2528)
Cannot shrink log file 2 (DB_log) because the logical log file located at the end of the file is in use. [SQLSTATE 01000] (Message 9008)
Processing database: DB [SQLSTATE 01000] (Message 0)
DBCC execution completed. If DBCC printed error messages, contact your system administrator. [SQLSTATE 01000] (Message 2528)
Backup, file manipulation operations (such as ALTER DATABASE ADD FILE) and encryption changes on a database must be serialized. Reissue the statement after the current backup or file manipulation operation is completed. [SQLSTATE 42000] (Error 3023)
Processing database: DB_AC [SQLSTATE 01000] (Error 0)
[SQLSTATE 01000] (Error 0) DBCC execution completed. If DBCC printed error messages, contact your system administrator. [SQLSTATE 01000] (Error 2528).
The step failed.
Please give any receomendations to avoid this error in future :
Yangamuni Prasad M

Hi Yangamuni,
Are there any progress?
Please have a look on the below threads with the similar issues as yours:
http://www.sqlservercentral.com/Forums/Topic652579-146-1.aspx
http://social.msdn.microsoft.com/forums/en-US/sqldatabaseengine/thread/ae4db890-c15e-44de-a2af-e85c04260331
The solution is change the recovery mode to SIMPLE, shrink log files and then change to the FULL recovery mode.
Thanks,
Weilin Qiao
Please remember to mark the replies as answers if they help and unmark them if they provide no help. This can be beneficial to other community members reading the thread.

Bottleneck when switching the redo log files.

Hello All,
I am using Oracle 11.2.0.3.
The application team reported that they are facing slowness at certain time.
I monitored the database and I found that at some switching of the redo log files (not always) I am facing a slowness at the application level.
I have 2 threads since my database is RAC, each thread have 3 redo log groups multiplexed to the FRA, with size 300 MB each.
Is there any way to optimize the switch of redo log files? knowing that my database is running in ARCHIVELOG mode.
Regards,

Hello Nikolay,
Thanks for your input I am sharing with you the below information. I have 2 instances so I will provide the info from each instance
Instance 1:
Load Profile              Per Second    Per Transaction   Per Exec   Per Call
~~~~~~~~~~~~         ---------------    --------------- ---------- ----------
      DB Time(s):                4.9                0.0       0.00       0.00
       DB CPU(s):                1.1                0.0       0.00       0.00
       Redo size:        3,014,876.2            3,660.4
   Logical reads:           32,619.3               39.6
   Block changes:            7,969.0                9.7
Physical reads:                0.2                0.0
Physical writes:              164.0                0.2
      User calls:            7,955.4                9.7
          Parses:              288.9                0.4
     Hard parses:               96.0                0.1
W/A MB processed:                0.2                0.0
          Logons:                0.9                0.0
        Executes:            2,909.4                3.5
       Rollbacks:                0.0                0.0
Instance 2:
Load Profile              Per Second    Per Transaction   Per Exec   Per Call
~~~~~~~~~~~~         ---------------    --------------- ---------- ----------
      DB Time(s):                5.5                0.0       0.00       0.00
       DB CPU(s):                1.4                0.0       0.00       0.00
       Redo size:        3,527,737.9            3,705.7
   Logical reads:           29,916.5               31.4
   Block changes:            8,893.7                9.3
Physical reads:                0.2                0.0
Physical writes:              194.0                0.2
      User calls:            7,742.8                8.1
          Parses:              262.7                0.3
     Hard parses:               99.5                0.1
W/A MB processed:                0.4                0.0
          Logons:                1.0                0.0
        Executes:            2,822.5                3.0
       Rollbacks:                0.0                0.0
    Transactions:              952.0
Instance 1:
Top 5 Timed Foreground Events
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                                                           Avg
                                                          wait   % DB
Event                                 Waits     Time(s)   (ms)   time Wait Class
DB CPU                                            1,043          21.5
log file sync                       815,334         915      1   18.9 Commit
gc buffer busy acquire              323,759         600      2   12.4 Cluster
gc current block busy               215,132         585      3   12.1 Cluster
enq: TX - row lock contention        23,284         264     11    5.5 Applicatio
Instance 2:
Top 5 Timed Foreground Events
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                                                           Avg
                                                          wait   % DB
Event                                 Waits     Time(s)   (ms)   time Wait Class
DB CPU                                            1,340          24.9
log file sync                       942,962       1,125      1   20.9 Commit
gc buffer busy acquire              377,812         594      2   11.0 Cluster
gc current block busy               211,270         488      2    9.1 Cluster
enq: TX - row lock contention        30,094         299     10    5.5 Applicatio
Instance 1:
Operating System Statistics        Snaps: 1016-1017
-> *TIME statistic values are diffed.
   All others display actual values. End Value is displayed if different
-> ordered by statistic type (CPU Use, Virtual Memory, Hardware Config), Name
Statistic                                  Value        End Value
AVG_BUSY_TIME                             17,451
AVG_IDLE_TIME                             81,268
AVG_IOWAIT_TIME                                1
AVG_SYS_TIME                               6,854
AVG_USER_TIME                             10,548
BUSY_TIME                                420,031
IDLE_TIME                              1,951,741
IOWAIT_TIME                                  288
SYS_TIME                                 165,709
USER_TIME                                254,322
LOAD                                           3                6
OS_CPU_WAIT_TIME                         523,000
RSRC_MGR_CPU_WAIT_TIME                         0
VM_IN_BYTES                              311,280
VM_OUT_BYTES                          75,862,008
PHYSICAL_MEMORY_BYTES             62,813,896,704
NUM_CPUS                                      24
NUM_CPU_CORES                                  6
NUM_LCPUS                                     24
NUM_VCPUS                                      6
GLOBAL_RECEIVE_SIZE_MAX                4,194,304
GLOBAL_SEND_SIZE_MAX                   4,194,304
TCP_RECEIVE_SIZE_DEFAULT                  16,384
TCP_RECEIVE_SIZE_MAX      9.2233720368547758E+18
TCP_RECEIVE_SIZE_MIN                       4,096
TCP_SEND_SIZE_DEFAULT                     16,384
TCP_SEND_SIZE_MAX         9.2233720368547758E+18
TCP_SEND_SIZE_MIN                          4,096
Operating System Statistics - Detail Snaps: 1016-101
Snap Time           Load    %busy    %user     %sys    %idle %iowait
22-Aug 11:33:55      2.7      N/A      N/A      N/A      N/A      N/A
22-Aug 11:50:23      6.2     17.7     10.7      7.0     82.3      0.0
Instance 2:
Operating System Statistics         Snaps: 1016-1017
-> *TIME statistic values are diffed.
   All others display actual values. End Value is displayed if different
-> ordered by statistic type (CPU Use, Virtual Memory, Hardware Config), Name
Statistic                                  Value        End Value
AVG_BUSY_TIME                             11,823
AVG_IDLE_TIME                             86,923
AVG_IOWAIT_TIME                                0
AVG_SYS_TIME                               4,791
AVG_USER_TIME                              6,991
BUSY_TIME                                475,210
IDLE_TIME                              3,479,382
IOWAIT_TIME                                  410
SYS_TIME                                 193,602
USER_TIME                                281,608
LOAD                                           3                6
OS_CPU_WAIT_TIME                         615,400
RSRC_MGR_CPU_WAIT_TIME                         0
VM_IN_BYTES                               16,360
VM_OUT_BYTES                          72,699,920
PHYSICAL_MEMORY_BYTES             62,813,896,704
NUM_CPUS                                      40
NUM_CPU_CORES                                 10
NUM_LCPUS                                     40
NUM_VCPUS                                     10
GLOBAL_RECEIVE_SIZE_MAX                4,194,304
GLOBAL_SEND_SIZE_MAX                   4,194,304
TCP_RECEIVE_SIZE_DEFAULT                  16,384
TCP_RECEIVE_SIZE_MAX      9.2233720368547758E+18
TCP_RECEIVE_SIZE_MIN                       4,096
TCP_SEND_SIZE_DEFAULT                     16,384
TCP_SEND_SIZE_MAX         9.2233720368547758E+18
TCP_SEND_SIZE_MIN                          4,096
Operating System Statistics - Detail Snaps: 1016-101
Snap Time           Load    %busy    %user     %sys    %idle %iowait
22-Aug 11:33:55      2.6      N/A      N/A      N/A      N/A      N/A
22-Aug 11:50:23      5.6     12.0      7.1      4.9     88.0      0.0
          -------------------------------------------------------------

Sizing the redo log files using optimal_logfile_size view.

Regards
I have a specific question regarding logfile size. I have deployed a test database and i was exploring certain aspects with regards to selecting optimal size of redo logs for performance tuning using optimal_logfile_size view from v$instance_recovery. My main goal is to reduce the redo bytes required for instance recovery. Currently i have not been able to optimize the redo log file size. Here are the steps i followed:-
In order to use the advisory from v$instance_recovery i had to set fast_start_mttr_target parameter which is by default not set so i did these steps:-
1)SQL> sho parameter fast_start_mttr_target;
NAME TYPE VALUE
fast_start_mttr_target integer 0
2) Setting the fast_start_mttr_target requires nullifying following deferred parameters :-
SQL> show parameter log_checkpoint;
NAME TYPE VALUE
log_checkpoint_interval integer 0
log_checkpoint_timeout integer 1800
log_checkpoints_to_alert boolean FALSE
SQL> select ISSES_MODIFIABLE,ISSYS_MODIFIABLE,ISINSTANCE_MODIFIABLE,ISMODIFIED from v$parameter where name like'log_checkpoint_timeout';
ISSES_MODIFIABL ISSYS_MODIFIABLE ISINSTANCE_MODI ISMODIFIED
FALSE IMMEDIATE TRUE FALSE
SQL> alter system set log_checkpoint_timeout=0 scope=both;
System altered.
SQL> show parameter log_checkpoint_timeout;
NAME TYPE VALUE
log_checkpoint_timeout integer 0
3) Now setting fast_start_mttr_target
SQL> select ISSES_MODIFIABLE,ISSYS_MODIFIABLE,ISINSTANCE_MODIFIABLE,ISMODIFIED from v$parameter where name like'fast_start_mttr_target';
ISSES_MODIFIABL ISSYS_MODIFIABLE ISINSTANCE_MODI ISMODIFIED
FALSE IMMEDIATE TRUE FALSE
Setting the fast_mttr_target to 1200 = 20 minutes of checkpoint switching according to Oracle recommendation
Querying the v$instance_recovery view
4) SQL> select ACTUAL_REDO_BLKS,TARGET_REDO_BLKS,TARGET_MTTR,ESTIMATED_MTTR, OPTIMAL_LOGFILE_SIZE,CKPT_BLOCK_WRITES from v$instance_recovery;
ACTUAL_REDO_BLKS TARGET_REDO_BLKS TARGET_MTTR ESTIMATED_MTTR OPTIMAL_LOGFILE_SIZE CKPT_BLOCK_WRITES
276 165888 *93* 59 361 16040
Here Target Mttr was 93 so i set the fast_mttr_target to 120
SQL> alter system set fast_start_mttr_target=120 scope=both;
System altered.
Now the logfile size suggested by v$instance_recovery is 290 Mb
SQL> select ACTUAL_REDO_BLKS,TARGET_REDO_BLKS,TARGET_MTTR,ESTIMATED_MTTR, OPTIMAL_LOGFILE_SIZE,CKPT_BLOCK_WRITES from v$instance_recovery;
ACTUAL_REDO_BLKS TARGET_REDO_BLKS TARGET_MTTR ESTIMATED_MTTR OPTIMAL_LOGFILE_SIZE CKPT_BLOCK_WRITES
59 165888 93 59 290 16080
After altering the logfile size to 290 as show below by v$log view :-
SQL> select GROUP#,THREAD#,SEQUENCE#,BYTES from v$log;
GROUP# THREAD# SEQUENCE# BYTES
1 1 24 304087040
2 1 0 304087040
3 1 0 304087040
4 1 0 304087040
5 ) After altering the size i have observed the anomaly as redo log blocks to be applied for recovery has increased from *59 to 696* also now v$instance_recovery view is now suggesting the logfile size of *276 mb*. Have i misunderstood something
SQL> select ACTUAL_REDO_BLKS,TARGET_REDO_BLKS,TARGET_MTTR,ESTIMATED_MTTR, OPTIMAL_LOGFILE_SIZE,CKPT_BLOCK_WRITES from v$instance_recovery;
ACTUAL_REDO_BLKS TARGET_REDO_BLKS TARGET_MTTR ESTIMATED_MTTR OPTIMAL_LOGFILE_SIZE CKPT_BLOCK_WRITES
*696* 646947 120 59 *276* 18474
Please clarify the above output i am unable to optimize the logfile size and have not been able to achieve the goal of reducing the redo log blocks to be applied for recovery, any help is appreciated in this regard.

sunny_123 wrote:
Sir oracle says that fast_start_mttr target can be set to 3600 = 1hour. As suggested by following oracle document
http://docs.oracle.com/cd/B10500_01/server.920/a96533/instreco.htm
I set mine value to 1200 = 20 minutes. Later i adjusted it to 120=2 minutes as Target_mttr suggested it to be around 100 (if fast_mttr_target value is too high or too low effective value is contained in target_mttr of v$instance_recovery)Just to add, you are reading the documentation of 9.2 and a lot has changed since then. For example, in 9.2 the parameter FSMTTR was introduced and explicitly required to be set and monitored by the DBA for teh additional checkpoint writes which might get caused by it. Since 10g onwards this parameter has been made automatically maintained by Oracle. Also it's been long that 9i has been desupported followed by 10g so it's better that you start reading the latest documentation of 11g and if not that, at least of 10.2.
Aman....

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