How to reduce the size of redo log files

Hi,
I am using Oracle Database 9.2.0.1.0. My present redo log files are of 100 MB each
(redo01.log,redo02.log,redo03.log) which tooks more time to swicth the logs.
I want to change the size to 20MB each so that log switcjing will be faster.
Please let me know the exact step to resize the redo log files so that Ican change it.
Regards,
Indraneel

Technical questions cannot be answered here. Please, post in the right forum :
General Database Discussions

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How to increase the size of Redo log files?

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I have 10g R2 RAC on RHEL. As of now, i have 3 redo log files of 50MB size. i have used redo log size advisor by setting fast_start_mttr_target=1800 to check the optimal size of the redologs, it is showing 400MB. Now, i want to increase the size of redo log files. how to increase it?
If we are supposed to do it on production, how to do?
I found the following in one of the article....
"The size of the redo log files can influence performance, because the behavior of the database writer and archiver processes depend on the redo log sizes. Generally, larger redo log files provide better performance, however it must balanced out with the expected recovery time.Undersized log files increase checkpoint activity and increase CPU usage."
I did not understand the the point however it must balanced out with the expected recovery time in the above given paragraph.
Can anybody help me?
Thanks,
Praveen.

You dont have to shutdown the database before dropping redo log group but make sure you have atleast two other redo log groups. Also note that you cannot drop active redo log group.
Here is nice link,
http://www.idevelopment.info/data/Oracle/DBA_tips/Database_Administration/DBA_34.shtml
And make sure you test this in test database first. Production should be touched only after you are really comfortable with this procedure.

Private strand flush not complete how to find optimal size of redo log file

hi,
i am using oracle 10.2.0 on unix system and getting Private strand flush not complete in the alert log file. i know this is due to check point is not completed.
I need to increase the size of redo log files or add new group to the database. i have log file switch (checkpoint incomplete) in the top 5 wait event.
i can't change any parameter of database. i have three redo log group and log files are of 250MB size. i want to know the suitable size to avoid problem.
select * from v$instance_recovery;
RECOVERY_ESTIMATED_IOS ACTUAL_REDO_BLKS TARGET_REDO_BLKS LOG_FILE_SIZE_REDO_BLKS LOG_CHKPT_TIMEOUT_REDO_BLKS LOG_CHKPT_INTERVAL_REDO_BLKS FAST_START_IO_TARGET_REDO_BLKS TARGET_MTTR ESTIMATED_MTTR CKPT_BLOCK_WRITES OPTIMAL_LOGFILE_SIZE ESTD_CLUSTER_AVAILABLE_TIME WRITES_MTTR WRITES_LOGFILE_SIZE WRITES_LOG_CHECKPOINT_SETTINGS WRITES_OTHER_SETTINGS WRITES_AUTOTUNE WRITES_FULL_THREAD_CKPT
625 9286 9999 921600 9999 0 9 112166207 0 0 219270206 0 3331591 5707793please suggest me or tell me the way how to find out suitable size to avoid problem.
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umesh

How often should a database archive its logs
Re: Redo log size increase and performance
Please read the above thread and great replies by HJR sir. I think if you wish to get concept knowledge, you should add in your notes.
"If the FAST_START_MTTR_TARGET parameter is set to limit the instance recovery time, Oracle automatically tries to checkpoint as frequently as necessary. Under this condition, the size of the log files should be large enough to avoid additional checkpointing due to under sized log files. The optimal size can be obtained by querying the OPTIMAL_LOGFILE_SIZE column from the V$INSTANCE_RECOVERY view. You can also obtain sizing advice on the Redo Log Groups page of Oracle Enterprise Manager Database Control."
Source:http://download-west.oracle.com/docs/cd/B13789_01/server.101/b10752/build_db.htm#19559
Pl also see ML Doc 274264.1 (REDO LOGS SIZING ADVISORY) on tips to calculate the optimal size for redo logs in 10g databases
Source:Re: Redo Log Size in R12
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mumbai,
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Just my 0.02£
Yury
Check this out:
A.
http://www.freelists.org/archives/ora-apps-dba/05-2006/msg00000.html
B.
- Users can subscribe to your list by sending email to
ora-apps-dba-request_at_freelists.org with 'subscribe' in the Subject field
C.
http://www.freelists.org/archives/ora-apps-dba/05-2006/threads.html

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Hello CKPT,
Thank you for the valuable information...
We have not configured databroker.
Output of the query
SELECT * FROM (
SELECT sequence#, archived, applied,
TO_CHAR(completion_time, 'RRRR/MM/DD HH24:MI') AS completed
FROM sys.v$archived_log
ORDER BY sequence# DESC)
WHERE ROWNUM <= 10
Primary...
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29680          YES          YES     2012/02/23 01:11
29680          YES          NO     2012/02/23 01:11
29679          YES          NO     2012/02/22 23:11
29679          YES          YES     2012/02/22 23:11
29678          YES          YES     2012/02/22 23:11
29678          YES          NO     2012/02/22 23:11
29677          YES          YES     2012/02/22 22:32
29677          YES          NO     2012/02/22 22:32
29676          YES          YES     2012/02/22 22:02
29676          YES          NO     2012/02/22 22:02
Standby...
SEQUENCE# ARC APP COMPLETED
29680 YES YES 2012/02/23 01:11
29679 YES YES 2012/02/22 23:11
29678 YES YES 2012/02/22 23:11
29677 YES YES 2012/02/22 22:32
29676 YES YES 2012/02/22 22:02
29675 YES YES 2012/02/22 21:24
29674 YES YES 2012/02/22 19:24
29673 YES YES 2012/02/22 18:59
29672 YES YES 2012/02/22 17:42
29671 YES YES 2012/02/22 17:41
Primary shows yes as well as no...
Next,
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THREAD#     MAX(SEQUENCE#)
1     29680
From standby:-
SQL> select thread#,max(sequence#) from v$archived_log where applied='YES' group by thread#;
THREAD# MAX(SEQUENCE#)
1 29680
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Output of query select * from v$parameter where name like 'log_archive_dest_2' shows below value...
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Yes, the network is good as they both resides in same LAN within same rack
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Hi all,
Can any one suggest me how to reduce the size of the following query .
/* Formatted on 2011/07/12 11:02 (Formatter Plus v4.8.8) */
SELECT prs.pa_rqst_srvc_sid,
(SELECT prpre.erroneous_data_value
FROM pa_error pe,
pa_error_detail ped,
pa_request_procedure_run_error prpre
WHERE pe.pa_error_sid = ped.pa_error_sid
AND ped.pa_error_sid = prpre.pa_error_sid
AND ped.oprtnl_flag = 'A'
AND prpre.oprtnl_flag = 'A'
AND prpre.pa_rqst_prcdr_sid = prp.pa_rqst_prcdr_sid
AND pe.pa_error_nmbr = '5031'
AND ped.aaa_segment_loop_nmbr = '2000F') revenue_iid,
(SELECT prpre.erroneous_data_value
FROM pa_error pe,
pa_error_detail ped,
pa_request_procedure_run_error prpre
WHERE pe.pa_error_sid = ped.pa_error_sid
AND ped.pa_error_sid = prpre.pa_error_sid
AND ped.oprtnl_flag = 'A'
AND prpre.oprtnl_flag = 'A'
AND prpre.pa_rqst_prcdr_sid = prp.pa_rqst_prcdr_sid
AND pe.pa_error_nmbr = '5013'
AND ped.aaa_segment_loop_nmbr = '2000F') x12_code_list_qlfr_lkpcd,
(SELECT prpre.erroneous_data_value
FROM pa_error pe,
pa_error_detail ped,
pa_request_procedure_run_error prpre
WHERE pe.pa_error_sid = ped.pa_error_sid
AND ped.pa_error_sid = prpre.pa_error_sid
AND ped.oprtnl_flag = 'A'
AND prpre.oprtnl_flag = 'A'
AND prpre.pa_rqst_prcdr_sid = prp.pa_rqst_prcdr_sid
AND pe.pa_error_nmbr = '5026'
AND ped.aaa_segment_loop_nmbr = '2000F') procedure_iid,
(SELECT prpre.erroneous_data_value
FROM pa_error pe,
pa_error_detail ped,
pa_request_procedure_run_error prpre
WHERE pe.pa_error_sid = ped.pa_error_sid
AND ped.pa_error_sid = prpre.pa_error_sid
AND ped.oprtnl_flag = 'A'
AND prpre.oprtnl_flag = 'A'
AND prpre.pa_rqst_prcdr_sid = prp.pa_rqst_prcdr_sid
AND pe.pa_error_nmbr = '5027'
AND ped.aaa_segment_loop_nmbr = '2000F') mdfr_code,
(SELECT prpre.erroneous_data_value
FROM pa_error pe,
pa_error_detail ped,
pa_request_procedure_run_error prpre
WHERE pe.pa_error_sid = ped.pa_error_sid
AND ped.pa_error_sid = prpre.pa_error_sid
AND ped.oprtnl_flag = 'A'
AND prpre.oprtnl_flag = 'A'
AND prpre.pa_rqst_prcdr_sid = prp.pa_rqst_prcdr_sid
AND pe.pa_error_nmbr = '5028'
AND ped.aaa_segment_loop_nmbr = '2000F') mdfr2_code,
(SELECT prpre.erroneous_data_value
FROM pa_error pe,
pa_error_detail ped,
pa_request_procedure_run_error prpre
WHERE pe.pa_error_sid = ped.pa_error_sid
AND ped.pa_error_sid = prpre.pa_error_sid
AND ped.oprtnl_flag = 'A'
AND prpre.oprtnl_flag = 'A'
AND prpre.pa_rqst_prcdr_sid = prp.pa_rqst_prcdr_sid
AND pe.pa_error_nmbr = '5029'
AND ped.aaa_segment_loop_nmbr = '2000F') mdfr3_code,
(SELECT prpre.erroneous_data_value
FROM pa_error pe,
pa_error_detail ped,
pa_request_procedure_run_error prpre
WHERE pe.pa_error_sid = ped.pa_error_sid
AND ped.pa_error_sid = prpre.pa_error_sid
AND ped.oprtnl_flag = 'A'
AND prpre.oprtnl_flag = 'A'
AND prpre.pa_rqst_prcdr_sid = prp.pa_rqst_prcdr_sid
AND pe.pa_error_nmbr = '5030'
AND ped.aaa_segment_loop_nmbr = '2000F') mdfr4_code,
(SELECT prpre.erroneous_data_value
FROM pa_error pe,
pa_error_detail ped,
pa_request_procedure_run_error prpre
WHERE pe.pa_error_sid = ped.pa_error_sid
AND ped.pa_error_sid = prpre.pa_error_sid
AND ped.oprtnl_flag = 'A'
AND prpre.oprtnl_flag = 'A'
AND prpre.pa_rqst_prcdr_sid = prp.pa_rqst_prcdr_sid
AND pe.pa_error_nmbr = '5014'
AND ped.aaa_segment_loop_nmbr = '2000F') rqst_prcdr_amt,
(SELECT prpre.erroneous_data_value
FROM pa_error pe,
pa_error_detail ped,
pa_request_procedure_run_error prpre
WHERE pe.pa_error_sid = ped.pa_error_sid
AND ped.pa_error_sid = prpre.pa_error_sid
AND ped.oprtnl_flag = 'A'
AND prpre.oprtnl_flag = 'A'
AND prpre.pa_rqst_prcdr_sid = prp.pa_rqst_prcdr_sid
AND pe.pa_error_nmbr = '5015'
AND ped.aaa_segment_loop_nmbr = '2000F') srvc_line_rate,
'NA' drug_desc, 'NA' product_service_id, 'NA' uom_code,
'NA' rqst_prcdr_units
FROM pa_transaction_request ptr,
input_acknwldgmnt ia,
input_batch_file ibf,
pa_request pr,
pa_request_service prs,
pa_request_procedure prp
WHERE ptr.input_acknwldgmnt_sid = ia.input_acknwldgmnt_sid
AND ia.input_batch_file_sid = ibf.input_batch_file_sid
AND ptr.pa_trnsctn_rqst_sid = pr.pa_trnsctn_rqst_sid
AND pr.pa_rqst_sid = prs.pa_rqst_sid
AND prs.pa_rqst_srvc_sid = prp.pa_rqst_srvc_sid
AND pr.oprtnl_flag = 'A'
AND prs.oprtnl_flag = 'A'
AND ptr.oprtnl_flag = 'A'
AND prp.oprtnl_flag = 'A'
AND prs.rqst_ctgry_lkpcd = 'AR'
AND ibf.original_file_name = 'HIPAA.165760000.20110613I001.278_IRej.dat';
Thanks,
P Prakash

Hi,
Maybe like that, but keep in mind that it is highly untested_ :SELECT
prs.pa_rqst_srvc_sid,
pvt.c5031 revenue_iid,
pvt.c5013 x12_code_list_qlfr_lkpcd,
pvt.c5026 procedure_iid,
pvt.c5027 mdfr_code,
pvt.c5028 mdfr2_code,
pvt.c5029 mdfr3_code,
pvt.c5030 mdfr4_code,
pvt.c5014 rqst_prcdr_amt,
pvt.c5015 srvc_line_rate,
srvc_line_rate,
'NA' drug_desc,
'NA' product_service_id,
'NA' uom_code,
'NA' rqst_prcdr_units
FROM
pa_transaction_request ptr,
input_acknwldgmnt ia,
input_batch_file ibf,
pa_request pr,
pa_request_service prs,
pa_request_procedure prp,
    SELECT
      prpre.pa_rqst_prcdr_sid,
      MAX(DECODE(pa_error_nmbr,'5013',prpre.erroneous_data_value,NULL)) c5013,
      MAX(DECODE(pa_error_nmbr,'5014',prpre.erroneous_data_value,NULL)) c5014,
      MAX(DECODE(pa_error_nmbr,'5015',prpre.erroneous_data_value,NULL)) c5015,
      MAX(DECODE(pa_error_nmbr,'5026',prpre.erroneous_data_value,NULL)) c5026,
      MAX(DECODE(pa_error_nmbr,'5027',prpre.erroneous_data_value,NULL)) c5027,
      MAX(DECODE(pa_error_nmbr,'5028',prpre.erroneous_data_value,NULL)) c5028,
      MAX(DECODE(pa_error_nmbr,'5029',prpre.erroneous_data_value,NULL)) c5029,
      MAX(DECODE(pa_error_nmbr,'5030',prpre.erroneous_data_value,NULL)) c5030,
      MAX(DECODE(pa_error_nmbr,'5031',prpre.erroneous_data_value,NULL)) c5031
    FROM
      pa_error pe,
      pa_error_detail ped,
      pa_request_procedure_run_error prpre
    WHERE
      pe.pa_error_sid     = ped.pa_error_sid
    AND ped.pa_error_sid = prpre.pa_error_sid
    AND ped.oprtnl_flag   = 'A'
    AND prpre.oprtnl_flag = 'A'
    AND pe.pa_error_nmbr IN ('5013','5014','5015','5026','5027','5028','5029',
      '5030','5031')
    AND ped.aaa_segment_loop_nmbr = '2000F'
    GROUP BY
      prpre.pa_rqst_prcdr_sid
pvt
WHERE
pvt.pa_rqst_prcdr_sid       = prp.pa_rqst_prcdr_sid
AND ptr.input_acknwldgmnt_sid = ia.input_acknwldgmnt_sid
AND ia.input_batch_file_sid   = ibf.input_batch_file_sid
AND ptr.pa_trnsctn_rqst_sid   = pr.pa_trnsctn_rqst_sid
AND pr.pa_rqst_sid            = prs.pa_rqst_sid
AND prs.pa_rqst_srvc_sid      = prp.pa_rqst_srvc_sid
AND pr.oprtnl_flag            = 'A'
AND prs.oprtnl_flag           = 'A'
AND ptr.oprtnl_flag           = 'A'
AND prp.oprtnl_flag           = 'A'
AND prs.rqst_ctgry_lkpcd      = 'AR'
AND ibf.original_file_name    = 'HIPAA.165760000.20110613I001.278_IRej.dat';Edited by: Nicosa on Jul 12, 2011 2:20 PM
Corrected columns aliases in outer query :
- c5031 instead of 5031
- c5013 instead of 5013

How to reduce the size of redo log files

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