Excessive redo activity

I have an applicatioin generating a 100meg redo log
about 1 every 5 minutes. Is there a way to verify the amount of redo being generated against the DML being run.
I used logmnr and pulled all the redo/undo sql. Just wondering if anyone has ever had any problems with Oracle creating archive logs that don't utilize the full allocated size. 100megs in my case.

Are the redo logs that are actually created 100 MB? It is certainly possible to force Oracle to switch redo logs before they are completely full, but if that's the case, you would end up with log files smaller than 100 MB.
Justin
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC

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Excessive redo log

Hello all:
Oracle10.2.0.3
OS Windows2003
Vendor app is running against the database and generating excessive redo switching logs every 10 minutes
Online redologs are already 1GB. Vendor wants them to be increased further. Suggestions to troubleshoot please.
multiblock_read_count is set to 128 and compatibility is set to 10.2.0.2.
Thanks
Sannidhi

You need to figureout what is causing so that this much is redo being generated. If your redologs are of 1gb and till those are getting switched in a span of 10 min then definately there is some thing that is generating to much redo.
Without analyzing the issue if you increase the redolog size, even that size may not be sufficient and may be filled quickly.
with logminer you can find what is there in the log file. or find out and trace the session which are doing some activity while the frequent switch hapens.
Edited by: sac on Sep 11, 2009 10:47 AM

How to reduce excessive redo log generation in Oracle 10G

Hi All,
Please let me know is there any way to reduce excessive redo log generation in Oracle DB 10.2.0.3
previously per day there is only 15 Archive log files are generating but now a days it is increased to 40 to 45
below is the size of redo log file members:
L.BYTES/1024/1024     MEMBER
200     /u05/applprod/prdnlog/redolog1a.dbf
200     /u06/applprod/prdnlog/redolog1b.dbf
200     /u05/applprod/prdnlog/redolog2a.dbf
200     /u06/applprod/prdnlog/redolog2b.dbf
200     /u05/applprod/prdnlog/redolog3a.dbf
200     /u06/applprod/prdnlog/redolog3b.dbf
here is the some content of alert message for your reference how frequent log switch is occuring:
Beginning log switch checkpoint up to RBA [0x441f.2.10], SCN: 4871839752
Thread 1 advanced to log sequence 17439
Current log# 3 seq# 17439 mem# 0: /u05/applprod/prdnlog/redolog3a.dbf
Current log# 3 seq# 17439 mem# 1: /u06/applprod/prdnlog/redolog3b.dbf
Tue Jul 13 14:46:17 2010
Completed checkpoint up to RBA [0x441f.2.10], SCN: 4871839752
Tue Jul 13 14:46:38 2010
Beginning log switch checkpoint up to RBA [0x4420.2.10], SCN: 4871846489
Thread 1 advanced to log sequence 17440
Current log# 1 seq# 17440 mem# 0: /u05/applprod/prdnlog/redolog1a.dbf
Current log# 1 seq# 17440 mem# 1: /u06/applprod/prdnlog/redolog1b.dbf
Tue Jul 13 14:46:52 2010
Completed checkpoint up to RBA [0x4420.2.10], SCN: 4871846489
Tue Jul 13 14:53:33 2010
Beginning log switch checkpoint up to RBA [0x4421.2.10], SCN: 4871897354
Thread 1 advanced to log sequence 17441
Current log# 2 seq# 17441 mem# 0: /u05/applprod/prdnlog/redolog2a.dbf
Current log# 2 seq# 17441 mem# 1: /u06/applprod/prdnlog/redolog2b.dbf
Tue Jul 13 14:53:37 2010
Completed checkpoint up to RBA [0x4421.2.10], SCN: 4871897354
Tue Jul 13 14:55:37 2010
Incremental checkpoint up to RBA [0x4421.4b45c.0], current log tail at RBA [0x4421.4b5c5.0]
Tue Jul 13 15:15:37 2010
Incremental checkpoint up to RBA [0x4421.4d0c1.0], current log tail at RBA [0x4421.4d377.0]
Tue Jul 13 15:35:38 2010
Incremental checkpoint up to RBA [0x4421.545e2.0], current log tail at RBA [0x4421.54ad9.0]
Tue Jul 13 15:55:39 2010
Incremental checkpoint up to RBA [0x4421.55eda.0], current log tail at RBA [0x4421.56aa5.0]
Tue Jul 13 16:15:41 2010
Incremental checkpoint up to RBA [0x4421.58bc6.0], current log tail at RBA [0x4421.596de.0]
Tue Jul 13 16:35:41 2010
Incremental checkpoint up to RBA [0x4421.5a7ae.0], current log tail at RBA [0x4421.5aae2.0]
Tue Jul 13 16:42:28 2010
Beginning log switch checkpoint up to RBA [0x4422.2.10], SCN: 4872672366
Thread 1 advanced to log sequence 17442
Current log# 3 seq# 17442 mem# 0: /u05/applprod/prdnlog/redolog3a.dbf
Current log# 3 seq# 17442 mem# 1: /u06/applprod/prdnlog/redolog3b.dbf
Thanks in advance

hi,
Use the below script to find out at what hour the generation of archives are more and in the hour check for eg. if MV's are running...or any programs where delete * from table is going on..
L
1 select
2    to_char(first_time,'DD-MM-YY') day,
3    to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'00',1,0)),'999') "00",
4    to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'01',1,0)),'999') "01",
5    to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'02',1,0)),'999') "02",
6    to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'03',1,0)),'999') "03",
7    to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'04',1,0)),'999') "04",
8    to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'05',1,0)),'999') "05",
9    to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'06',1,0)),'999') "06",
10    to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'07',1,0)),'999') "07",
11    to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'08',1,0)),'999') "08",
12    to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'09',1,0)),'999') "09",
13    to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'10',1,0)),'999') "10",
14    to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'11',1,0)),'999') "11",
15    to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'12',1,0)),'999') "12",
16    to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'13',1,0)),'999') "13",
17    to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'14',1,0)),'999') "14",
18    to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'15',1,0)),'999') "15",
19    to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'16',1,0)),'999') "16",
20    to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'17',1,0)),'999') "17",
21    to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'18',1,0)),'999') "18",
22    to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'19',1,0)),'999') "19",
23    to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'20',1,0)),'999') "20",
24    to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'21',1,0)),'999') "21",
25    to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'22',1,0)),'999') "22",
26    to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'23',1,0)),'999') "23",
27    COUNT(*) TOT
28    from v$log_history
29 group by to_char(first_time,'DD-MM-YY')
30 order by daythanks,
baskar.l

Excessive disk activity with Safari 3.2.1

Since updating to Safari 3.2.1 on os 10.4.11, my hard disk begins a lengthy bout of intense disk activity within a minute or two of opening Safari. It just keeps chunking away, and it only stops when I quit the browser. This happens whether or not I load any pages.
Looking at Activity Monitor when this is happening, it is clearly Safari that is causing the excessive disk activity. And during these periods, Safari is using 15% to 30% CPU.

I see the same thing:
http://img.skitch.com/20090212-pbe1s4wprd6rjmjiq3sfe1s961.jpg
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What is it doing? As for 'resetting' it, what do you mean? Just quit and restart Safari? OK, but this happens consistently.
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Message was edited by: Tor Lundgren

Windows - Excessive Disk Activity and "ccmexec.exe"

ccmexec.exe is constantly rummaging through my hard drives, apparently looking for something.
It does not seem to be producing any kind of output file (at least none that I can find).
I have created a batch file to turn off the SMS service, and kill ccmexec.exe, however this is not the best solution.
Since the SMS service allows corporate to keep my computer updated, I do not wish to turn it off permanently.
Is there a way to find out more details on what the ccmexec.exe is looking for?
And what it does with the information it finds?
Note: I already posted this on the regular forums, however the response suggested I re-post it to this one:
The question is also better suited for the audience on TechNet. Please post your question in the following link for better assistance:
http://social.technet.microsoft.com/Forums/en-us/sms/threads
Original Posting:
http://answers.microsoft.com/en-us/windows/forum/windows_xp-performance/windows-excessive-disk-activity-and-ccmexecexe/6a5904bd-8c5c-4c97-b589-4a370889c19f

We have the same problem with software inventory at my site. The scheduled scan trashes my hard disk and brings my computer to a crawl every MWF morning. You can check if software inventory is enabled by going to 'Control Panel -> Configuration
Manager'. Then, select the 'Components' tab and look for the status of 'Software Inventory Agent'. If software inventory is enabled for your client, you probably do not have access to disable it. However, you can configure software inventory
to skip your hard drive by following instructions at https://technet.microsoft.com/en-us/library/bb632671.aspx
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Excessive Redo Generation After Upgrading on Oracle 10gR2

We had our production database hosted on Oracle 9.2.0. Few months back we have migrated it to Oracle 10.2.0.4.0.
After Migration I have noticed that redo generation has become very very high. In earlier case no. of log files generating in production hours were around 20 where as after migration it become around 200 files per day. I have run statspack report on this database. Statspack report is also saying that log file switch wait is become very high. Parameter timed_statistics has also been set to FALSE. Workload on the database is same before & after upgrade. Queries running in the sessions are also same before & after upgrade. All the parameters & memory structures are same after upgrade. Satatpack report is saying that db block change & disk write is become very high. I had used import export for upgrading the databases. Please provide a solution for this problem.
Thanks In advance for all your favours....

Hi;
Please check below notes which could be helpful for your issue:
Diagnosing excessive redo generation [ID 199298.1]
Excessive Archives / Redo Logs Generation Troubleshooting [ID 832504.1]
Troubleshooting High Redo Generation Issues [ID 782935.1]
How to Disable (Temporary) Generation of Archive Redo Log Files [ID 177218.1]
Regard
Helios

Excessive disk activity

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Whenever your system does something like freeze, first step:
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boot from DVD and repair.
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it becomes sluggish
When you have the problem, note the exact time: hour, minute, second.
These instructions must be carried out as an administrator. If you have only one user account, you are the administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
Make sure the title of the Console window is All Messages. If it isn't, select All Messages from the SYSTEM LOG QUERIES menu on the left. If you don't see that menu, select
View ▹ Show Log List
from the menu bar.
Each message in the log begins with the date and time when it was entered. Scroll back to the time you noted above. Select the messages entered from then until the end of the episode, or until they start to repeat, whichever comes first. Copy the messages to the Clipboard by pressing the key combination command-C. Paste into a reply to this message by pressing command-V.
The log contains a vast amount of information, almost all of it useless for solving any particular problem. When posting a log extract, be selective. In most cases, a few dozen lines are more than enough. It is never necessary or helpful to post more than about 100 lines. "The more, the better" is not the rule here.
Please do not indiscriminately dump thousands of lines from the log into this discussion.
Important: Some private information, such as your name, may appear in the log. Anonymize before posting.

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Reset the SMC, as per > Resetting the System Management Controller
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“Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.”

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Tom Duerbusch
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Dear Mr. Hunt,
I'm an experienced Oracle DBA.
The tech staff in organizing VLDB systems (very large databases) is quiet similar to what you have showed here.
May I suggest, Perhaps, for your readers benefits ( especially those who do professional large scale editing projects) I think it will be a good idea to elaborate about some modern storage systems architectures like NetApp , EMC etc.
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Sincerely Yours,
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FF 18.0.1 on Windows XP SP3.
Within 1 minute of starting FF I observe constant and excessive disk activity.
I am unable to use any other applications due to the response time.
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Redo Log Files - more than 12 per hour

Hello @all,
I have a problem with my redo log files. I get more than 12 switches per Hour. I have 3 Files with 5oM size. I increased the sitz to 15o M, but
I still have 12 switches per hour.
Do anyone know, what I did wrong?
Database:
Oracle 9i
Thanks
Martin

user9528362 wrote:
Hello @all,
yes I know, that 3 switches per hour are perfekt, but I had increased the Size from 5o M to 15oM already and the amount from switches, are not reduced.
So there must be something else, that causes the log switches.Martin,
As I said somewhere above too, 150meg is a tiny size if you are managing a production db. I have already mentioned that make your log file size to at least 500meg and than check. As for the high redo activity, only you can confirm that whether this has been started from now only or was happening before too? In anycase, for an active oltp, 500 to 1gb of redo log file size should be okay.
For the extra redo generation, you have been given link for mining log files using logminer. Try using it to see what is causing extra redo.
HTH
Aman....

Excessive redo activity

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