Redolog Paralelism
If any one kindly describe me what is redolog parallelism in oracle 9i and when it is used
I believe you are referring to log_parallelism. Please refer to 9i doc guide
http://www.cs.bris.ac.uk/maintain/oracle9docs/server.920/a96536/ch1105.htm
Please note that there is a limitation that LOG_PARALLELISM initialization parameter has to be set to 1while creating a logical standby database. This paramter is no lonfer valid in 10g
Cheers
Amit
Similar Messages
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SAP GoLive : File System Response Times and Online Redologs design
Hello,
A SAP Going Live Verification session has just been performed on our SAP Production environnement.
SAP ECC6
Oracle 10.2.0.2
Solaris 10
As usual, we received database configuration instructions, but I'm a little bit skeptical about two of them :
1/
We have been told that our file system read response times "do not meet the standard requirements"
The following datafile has ben considered having a too high average read time per block.
File name -Blocks read - Avg. read time (ms) -Total read time per datafile (ms)
/oracle/PMA/sapdata5/sr3700_10/sr3700.data10 67534 23 1553282
I'm surprised that an average read time of 23ms is considered a high value. What are exactly those "standard requirements" ?
2/
We have been asked to increase the size of the online redo logs which are already quite large (54Mb).
Actually we have BW loading that generates "Chekpoint not comlete" message every night.
I've read in sap note 79341 that :
"The disadvantage of big redo log files is the lower checkpoint frequency and the longer time Oracle needs for an instance recovery."
Frankly, I have problems undertanding this sentence.
Frequent checkpoints means more redo log file switches, means more archive redo log files generated. right ?
But how is it that frequent chekpoints should decrease the time necessary for recovery ?
Thank you.
Any useful help would be appreciated.Hello
>> I'm surprised that an average read time of 23ms is considered a high value. What are exactly those "standard requirements" ?
The recommended ("standard") values are published at the end of sapnote #322896.
23 ms seems really a little bit high to me - for example we have round about 4 to 6 ms on our productive system (with SAN storage).
>> Frequent checkpoints means more redo log file switches, means more archive redo log files generated. right?
Correct.
>> But how is it that frequent chekpoints should decrease the time necessary for recovery ?
A checkpoint is occured on every logswitch (of the online redologfiles). On a checkpoint event the following 3 things are happening in an oracle database:
Every dirty block in the buffer cache is written down to the datafiles
The latest SCN is written (updated) into the datafile header
The latest SCN is also written to the controlfiles
If your redologfiles are larger ... checkpoints are not happening so often and in this case the dirty buffers are not written down to the datafiles (in the case of no free space in the buffer cache is needed). So if your instance crashes you need to apply more redologs to the datafiles to be in a consistent state (roll forward). If you have smaller redologfiles more log switches are occured and so the SCNs in the data file headers (and the corresponding data) are closer to the newest SCN -> ergo the recovery is faster.
But this concept does not really fit the reality because of oracle implements some algorithm to reduce the workload for the DBWR in the case of a checkpoint.
There are also several parameters (depends on the oracle version) which control that a required recovery time is kept. (for example FAST_START_MTTR_TARGET)
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Hi,
I would want to read the contents of the redolog files on my database.
Actually, I can't because these files are binary files*. I would want to know if there is a way to read these redolog files , if for example Oracle has tools to learn these redolog files.
Thanks.In order to read the content of the Redo Log files, you should use Logminer Utility
Please refer to the documentation for more information:
[Using LogMiner to Analyze Redo Log Files|http://download.oracle.com/docs/cd/B19306_01/server.102/b14215/logminer.htm#SUTIL019]
Kamran Agayev A. (10g OCP)
http://kamranagayev.wordpress.com
[Step by Step install Oracle on Linux and Automate the installation using Shell Script |http://kamranagayev.wordpress.com/2009/05/01/step-by-step-installing-oracle-database-10g-release-2-on-linux-centos-and-automate-the-installation-using-linux-shell-script/] -
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Hi All,
I am preparing the standby database using RMAN creation steps. I am confusing in one area. I have standby redologs in the Primary server. When we issue the duplicate target database for standby dorecover nofilenamecheck command, is it create the standby redologs in the standby database or not ?
please cofirm
Thanks
ShijuHi,
no, you must to create standby redo logs manually.
This script may help you
select 'alter database add standby logfile '''||
regexp_substr(MEMBER,'/.+/')||'stdby_'||
regexp_replace(member,regexp_substr(MEMBER,'/.+/'),'')||
''' size '||bytes||';' "Create Standby redo"
from v$logfile lf , v$log l
where l.group# = lf.group#
union all
select 'alter database add standby logfile '''||
regexp_substr(MEMBER,'/.+/')||'stdby_redo0'||(select max(group#)+1 from v$log)||'.rdo'||
''' size '||bytes||';' "Create Standby redo"
from v$logfile lf , v$log l
where l.group# = lf.group#
and rownum <=2
Create Standby redo
alter database add standby logfile '/oracle/redo/prod1/stdby_redo03a.rdo' size 52428800;
alter database add standby logfile '/oracle/redo/prod1/stdby_redo03b.rdo' size 52428800;
alter database add standby logfile '/oracle/redo/prod1/stdby_redo02a.rdo' size 52428800;
alter database add standby logfile '/oracle/redo/prod1/stdby_redo02b.rdo' size 52428800;
alter database add standby logfile '/oracle/redo/prod1/stdby_redo01a.rdo' size 52428800;
alter database add standby logfile '/oracle/redo/prod1/stdby_redo01b.rdo' size 52428800;
alter database add standby logfile '/oracle/redo/prod1/stdby_redo04.rdo' size 52428800;
more
http://www.pythian.com/news/581/oracle-standby-redo-logs
Regards,
Tom
http://asktom.cz -
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Hi Guys,
Setup: Two Node 11gR2 (11.2.0.1) RAC on RHEL 5.4
Existing disks are from Old SAN & New Disks are from New SAN.
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'/dev/oracleasm/disks/NEWDATA3' NAME NEWDATA_0003,
'/dev/oracleasm/disks/NEWDATA4' NAME NEWDATA_0004,
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Check rebalance status from v$ASM_OPERATION.
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NEWDATA_0000,
NEWDATA_0001
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Check rebalance status from v$ASM_OPERATION.
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ManishManish Nashikkar wrote:
Hi Guys,
Setup: Two Node 11gR2 (11.2.0.1) RAC on RHEL 5.4
Existing disks are from Old SAN & New Disks are from New SAN.
Can I move all datafiles (+DATA), controlfiles (+CTRL), redolog (+REDO) on new ASM Disks by adding disks in is same Diskgroup & dropping older disks from existing Diskgroup taking advantage of ASM Re-balancing Feature.
1) add required disks in the DATA Diskgroups,
ALTER DISKGROUP DATA ADD DISK
'/dev/oracleasm/disks/NEWDATA3' NAME NEWDATA_0003,
'/dev/oracleasm/disks/NEWDATA4' NAME NEWDATA_0004,
'/dev/oracleasm/disks/NEWDATA5' NAME NEWDATA_0005
REBALANCE POWER 11;
Check rebalance status from v$ASM_OPERATION.
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ALTER DISKGROUP DATA DROP DISK
NEWDATA_0000,
NEWDATA_0001
REBALANCE POWER 11;
Check rebalance status from v$ASM_OPERATION.
3) Do it same for Redo log groups & Controlfile Diskgroups.
I hope, I could do this Activity, even if database is Up. is there possibility of Database block Corruption ??? (or is it necessary to perform above steps when database is down)
Would be appreciated, your quick responses on the same.
It's an urgent requirement. Thanks.
Regards,
Manish
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Yes you can do that by adding new disk to existing diskgroup and delete old diskgroup. The good thing is this can be done online however you need to make sure the rebalance power is meet your business time, higher rebalance power is faster to rebalance to complete however it also will consume more resources
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workaround:
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is it works ?Hi,
i foolowed what you said .removing the files you manually created,
SQL> startup mount;
ORACLE instance started.
Total System Global Area 488082184 bytes
Fixed Size 731912 bytes
Variable Size 268435456 bytes
Database Buffers 218103808 bytes
Redo Buffers 811008 bytes
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ORA-00279: change 1578125068 generated at 03/06/2009 06:22:35 needed for thread
1
ORA-00289: suggestion : /oratranslog/archive/1_34930.dbf
ORA-00280: change 1578125068 for thread 1 is in sequence #34930
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
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ORA-27037: unable to obtain file status
SVR4 Error: 2: No such file or directory
Additional information: 3
ORA-01547: warning: RECOVER succeeded but OPEN RESETLOGS would get error below
ORA-01194: file 1 needs more recovery to be consistent
ORA-01110: data file 1: '/oracle1/oradata/voipdb/system01.dbf'
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alter database open resetlogs
ERROR at line 1:
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ORA-01110: data file 1: '/oracle1/oradata/voipdb/system01.dbf'
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Keeping the size of 1000 is good or i should decrease it ?
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http://download.oracle.com/docs/cd/E11882_01/server.112/e16638/instance_tune.htm#PFGRF94563
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Regards
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