Log switch and checkpoint - Oracle 11g

Hi
I've read a documentations and forum, but I can't find clean explanation. I'd like to ask - does switch log trigger checkpoint? I've heard, that from 8i version checkpoint doesn't occur on log switch, but can't find information
in documentation.
Thanks awfully for help.
Regards

before 8i , logfile switch caused full checkpoint
8i and above , logfile switch no longer causes full checkpoint , it causes a "log switch checkpoint"
A log switch checkpoint write the contents of "some" dirty buffers to the disk

Similar Messages

How to shutdown and startup oracle 11g R1 from dbcontrol (EM)?

Dear All,
I have already installed oracle 11g R1. The database is running smooth including the dbcontrol / EM.
I have difficulty in shutdown and restart database from EM.
How to set EM, so that I can start and shutdown the database from EM?

Hi,
If you are in windows, this is a very common problem.
You can try setting the logon as batch job to the OS user from local security policy
1.Go Control Panel, Administrative Tools.
2. Click on Local Security Policy.
3. Local Policies, User Rights Assignment.
4. Double click, 'Log on as a batch job'
Here provide username along with domain name like co.uk\foo
Regards

DB13: Execute Redo log backup of remote Oracle 11g database fails

Dear Experts,
First of all I have to state I am not very experienced in administrating (Oracle) databases, but I would like to ask you all the following:
We run two SAP Systems with each their own database on the same host:
1. SAP SRM ABAP system on Oracle 11g
2. SAP NetWeaver WebAS Java (Portal) on Oracle 11g
We would like to schedule backups of the Java database in transaction code DB13 on the SRM ABAP system.
Actions already taken:
- We have maintained the proper database connection to the Java database and have set file system permissions correctly (according SAP Note 102570). Connection in transaction DB02 is fine and stats are showing for both databases.
- We have maintained enviroment settings for <SID>_ORACLE_HOME and <SID>_SAPDATA_HOME and for the shell (csh).
- Destination SAPXPG_DBDEST_<host> is maintained in SM59.
When we schedule a Redo log backup of Java System in DB13 and execute immediately, we receive the following error:
Process died due to signal 11
SXPG_COMMAND_EXECUTE mislukt voor BRARCHIVE - oorzaak: unknown
Any tips?
Thanks in advance & Best regards,
Jan Laros

Hi Eduardo,
Thank you for your reply.. Today I am at another customer, so I can not check it. But is seems to me that the BRTOOLS are up-to-date as we installed the system fresh and imported the Support Package and kernel updates right afterwards.
I will check which BRTOOLS are used tonight, anyway.
Best regards,
Jan

Database log switch and WLS connection pool relation

Hi,
We have been facing WLS JDBC connection pool disable and suspension issue very frequently in our environment and as a work around have implemented multi-datasource configuration (fail over method).
But we need to know the root cause for the same and want to fix the issue too.
We have tried many options like increasing no. of processes and transaction on Database, fine tune the weblogic datasource but still we could not isolate the issue.
Recently we have been advised to minimize the log switch on database front and increase the redo log size. Not sure if this will help in isolating the issue or not.
So we are Looking forward for the comments and suggestions on what would be the relationship b/w datasource and log switch be and if someone have faced this issue and resolved the same by fine tuning the database and minimizing the log switch.
We are using WLS 10.3.3.0
-Rohit

turn on jdbc logging. The server log should be showing the troubles WLS is having
while testing connections and trying/failing to make replacement connections.

Image not displaying in pdf report using XSL-FO and using Oracle 11g databa

Good Afternoon,
I have created over 15 reports using XSL-fo, with the following syntax to display an image on the pdf:
fo:block margin-left="0.24cm" margin-right="0.27cm" margin-top="0.0cm" ><fo:external-graphic content-width="scale-to-fit" content-height="scale-to-fit" width="1.73cm" height="1.57cm" >
<xsl:attribute name="src">'url("http://readiness:7780/i/marforcom_symbol_rpts.gif")'</xsl:attribute></fo:external-graphic>
</fo:block>
This syntax works fine when using Oracle 10g, now my database has been upgraded to 11g and my image no longer displays in the reports. I have already upload the image into the database as a workspace image.
I have tried to point the image @ the image by using url(#WORKSPACE_IMAGE#marforcom_symbol_rpts.gif)
or <img src ="#IMAGE_PREFIX#marforcom_symbol_rpts.gif")
and it still doesn't work.
I have searched this forum trying to come up with a solution that will fix my problem and am unable to.
Current config: Oracle 11g, using pl/sql gateway.
I need to know how to point the xsl-fo file to the database, where the image now resides.
Thanks,
Mary
Edited by: MaryM on Jul 25, 2012 3:15 PM
Edited by: MaryM on Jul 25, 2012 3:51 PM

Hi,
I think you need load images to database XDB virtual directory /i/ and then use #IMAGE_PREFIX# substitution.
This might help to access /i/
http://www.apex-blog.com/oracle-apex/accessing-i-using-ftp-170.html
Or use this to load images
http://oracleinsights.blogspot.fi/2012/05/loading-images-into-oracle-xdb.html
Regards,
Jari
My Blog: http://dbswh.webhop.net/dbswh/f?p=BLOG:HOME:0
Twitter: http://www.twitter.com/jariolai

SESSION_PER_USER limit of the user profile and memory Oracle 11g

Hi,
I am new to oracle 11g.
My applications are facing some problem hosted over oracle 11g and this issue appearing because of there is not sufficient sessions available.
Here is current setting
CPU count                    2
Parallel Thred per CPU               2
Resource Manager CPU allocation     2
Shared mamory address          0
Memory MAX target               6GB
Memory Target               6GB
Total Size of DB               75
Used Size of DB               55
Sessions -MAX               555
Processes-MAX               500
We want following settings
Total Size of DB               75
Used Size of DB               55
Sessions -MAX               1200
Processes-MAX               800
Here is my qurey
Is there any relationship between memory allocated to database and Sessions -MAX & Processes-MAX or CPU allocated .
and whats best setting we can get for Sessions -MAX & Processes-MAX for given configuration of CPU and memory ?
Thanks
Edited by: user13714831 on Jul 22, 2011 12:54 PM

limit number of session per user using wired dot1x is not available in 1.3

OWB RT Log Switches and Parameter

Good day, all.
For various reasons we find ourselves with an OWB data base repository release 10.1 and the target ODS data base release 10.2.0.4. This is an approved configuration within the Oracle Product Matrix. Both sit on the same MS 2003 64-bit Server. We have had an on going issue that causes the OWB RT Log File to switch sometimes 20 to 30 (although it is rare this many times) during one OWF Workflow session. Our past experience is one workflow session, one owb rt log; that was in a OWB 10.1 and ODS 10.1 scenario. Now we are in an OWB 10.1 and ODS 10.2 environment. With this many possible OWB RT Log swtiches it is difficult to perform any forensics when the system only retains 3 copies of the logs at any given time. Does anyone know where to find that parameter to up the number of logs retained? Disk space is not an issue, reasonably speaking, for possibily retaining 8 to 16 OWB RT Logs.
I can be contacted direct at [email protected]
Thank you for your help in advance.
Jeff

Hi Jeff ,
You can refer MOS note 844211.1 How To Control The Control Center Service Log Files
Thanks,
Sutirtha

Windows 7 64-bit and need to install both 32bit and 64bit Oracle 11g client

Hello
First I am sorry for asking what is probably a common knowledge answer from most in the forum. I just cannot find a straight forward answer searching these forums or via google.
We have Windows 7 64-bit planned as our next desktop upgrade. We have several Oracle databases, and all of the client software in our environment is 32 bit.
I want to try and be ahead of the curve so I want to deploy the latest 64-bit 11g client instead of our current client (10g 32bit).
The simple question is this: Can we actually do that with our 32bit application suite or do I need to install the 32bit client for 32bit applications side-by-side with the 64bit 11g Oracle client for future 64-bit clients?
For a follow up to that, if I do, then does anyone have good instructions on that? I found one article on this but it seemed custom and made use of the mklink command, so I have my doubts this is correct.
Thanks

Thanks for the tip. What I wonder though is should I do that or does the 64-bit client have a 32-bit layer that works with 32-bit applications or, am I forced to still deploy a 32-bit client because of my 32-bit software?
Thanks

Oracle Forms 6i and database oracle 11g

Hello!
Today we have Oracle Forms 6i running against databse 9i. We are in the process of upgrading our db to 11g.
Will our Forms application still work? What steps do we need to do to make it work?
Any input is valuable.
We have the same quetsion oabout Oracle reports 6i.

Hello,
I you follow the Note:338513.1 on Metalink, you can see the following:
Forms / Reports 6i patchset 16 or patchset 17 was certified to work against Oracle Server (RDBMS)+
+10g Rel 1 (10.1.x)+
Forms / Reports 6i has never been certified, nor will it ever be certified against Oracle Server (RDBMS) 10g Rel 2 (10.2.x) or Oracle Server (RDBMS) 11g (11.x).
+(This is because Forms / Reports 6i is now de-supported - see important note below)+
Important Note: Forms / Reports 6i is now de-supported e.g.
- If running in client-server mode, Forms / Reports 6i was desupported at end of January 2005
- If deploying over the web, Forms / Reports 6i (Oracle 9iAS Rel 1 Forms / Reports Services) was desupported at the end of June 2004
This means that Forms / Reports development will no longer provide an error correction service for Forms / Reports 6i (unless an organisation has purchased extended maintenance support) Therefore, Oracle strongly recommends that customers using desupported versions upgrade to a supported version e.g upgrade to Oracle Developer Suite 10g Rel 1 or 2 / Oracle Application Server 10g Rel 1 or 2
Francois

Backup and Redundancy Oracle 11g

Hi,
1. If we set the redundancy to 2, does it mean 2 level 0 backups taken at 2 different points in time one after another or does it mean 2 copies of the same level0 backup?
2. What is the effect of redundancy 2 on incremental backups? Are they also going to be 2 copies?
Thanks & Regards,

Vijay.Cherukuri wrote:
Hi,
Have you read the above link ?
Assume a different case in which REDUNDANCY is 1. You run a level 0 database backup at noon Monday,
a level 1 cumulative backup at noon on Tuesday and Wednesday, and a level 0 backup at noon on Thursday.
Immediately after each daily backup you run a DELETE OBSOLETE. The Wednesday DELETE command does not remove
the Tuesday level 1 backup because this backup is not redundant: the Tuesday level 1 backup could be used to recover
the Monday level 0 backup to a time between noon on Tuesday and noon on Wednesday. However,
the DELETE command on Thursday removes the previous level 0 and level 1 backups.
Also please see : http://web.njit.edu/info/oracle/DOC/backup.102/b14191/rcmconc1007.htm
As far i know RMAN does not delete backups if they are needed for recovery although they are obsolete (crossed retention policy )Not until you issue DELETE OBSOLETE.
Please note that backups are not marked obsolete. They are evaluated for obsolescence when a command that references obsolescence (DELETE ... or REPORT ...) is issued. You can change your retention policy all you want, but until you actually DELETE OBSOLETE, nothing happens to those backups. Then they will be deleted (or not) as per the retention policy that is in effect at the time of the DELETE OBSOLETE command.
That said, it is my understanding that if you keep your backups in the FRA, oracle will automatically delete obsolete backups if needed to free up space for newer backups. I've not personally investigated this so could be wrong. If this is the case, I would imaging that oracle still would not be deleting a backup as soon as it becomes obsolete, as that would require constant re-evaluation, but rather when it determines that it needs to find some space for a new backup.

To export and import oracle 11g table data only

Hi Gurus,
Just not sure of the procedure to follow in the export just the table data and then truncate the table do some changes(not table structure changes ) and then import the same table data in to the relevent table .
Could some please help me in the setps involved in it .
Thanks a Lot in advance

If you can use Data Pump, here are your commands:
expdp table_owner/password directory=<your_directory> dumpfile=table_name.dmp tables=table_name content=data_only
impdp table_owner/password directory=<your_directory> dumpfile=table_name.dmp tables=table_name table_exists_action=append
Data Pump requires version 10.1 or later.
Dean

Log switch must occur every 15 to 30 minutes: good practice or myth?

I often heard that it is recommended to size redo log files in a way that Oracle performs a log switch every 15 to 30 minutes.
I would like to know if it is true or if it is a myth ?
I would like to know the best way for sizing redo log files ?
What happen exactly in the database when a log switch occurs ?
Please help me to clarify these concepts.

So we can say that a log switch induces a full checkpoint. That's correct ?Well, no :-) . Indeed with a log switch the checkpoint event is generated requesting DBWR to flush the buffers from the checkpoint-queue to the data files but this is not a full checkpoint and it would not update the datafile and control file headers. The Full Checkpoint happens with the alter system checkpoint ( as shown) , database being shutdown properly.
Please see the below code which shows the same,
Connected to:
Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> select checkpoint_change# from V$datafile;
CHECKPOINT_CHANGE#
           3507400
           3507400
           3507400
           3507400
           3507400
           3507400
           3507400
7 rows selected.
SQL> select * from V$log;
    GROUP#    THREAD# SEQUENCE#      BYTES    MEMBERS ARC STATUS
FIRST_CHANGE# FIRST_TIM
         1          1         91   52428800          1 NO CURRENT
      3507399 13-APR-10
         2          1         89   52428800          1 NO INACTIVE
      3486253 13-APR-10
         3          1         90   52428800          1 NO INACTIVE
      3486256 13-APR-10
SQL> alter system switch logfile;
System altered.
SQL> select * from V$log;
    GROUP#    THREAD# SEQUENCE#      BYTES    MEMBERS ARC STATUS
FIRST_CHANGE# FIRST_TIM
         1          1         91   52428800          1 NO ACTIVE
      3507399 13-APR-10
         2          1         92   52428800          1 NO CURRENT
      3507906 13-APR-10
         3          1         90   52428800          1 NO INACTIVE
      3486256 13-APR-10
SQL> select checkpoint_change# from V$datafile;
CHECKPOINT_CHANGE#
           3507400
           3507400
           3507400
           3507400
           3507400
           3507400
           3507400
7 rows selected.
SQL> select checkpoint_change# from V$datafile;
CHECKPOINT_CHANGE#
           3507400
           3507400
           3507400
           3507400
           3507400
           3507400
           3507400
7 rows selected.
SQL> alter system checkpoint;
System altered.
SQL> select checkpoint_change# from V$datafile;
CHECKPOINT_CHANGE#
           3507936
           3507936
           3507936
           3507936
           3507936
           3507936
           3507936
7 rows selected.
SQL>HTH
Aman....

Is there a way to identify manual log switches?

Hi!
A while ago I upgraded a 10g database to 11.2.0.2 64 Bit Windows.
During the Upgrade we realized that redo logs were configured really small (~10MB) what resulted in a lot of log switches (a few hundred per day). So we adjusted redo log size to 100MB and set archive_lag_target to 1800.
The amount of log switches went down a little but less far than we expected it. After further analysing the situation we recognized that Oracle is switching logs far before reaching the 100MB log size (and also far before reaching 1800s). All the archived logs have a size of about 15MB. I know that 11g invented something like "preemptive log switching" that switches logs round about 20% before reaching the maximum value (if I remember it correctly..). But switching already at 15% of the maximum size seems strange to me...
I couldn't find any helpful stuff on Google or Metalink about that topic but today I had a different idea: what if it's the application software that's doing manual log switches?
(I have no idea why it should do that but I can remember that the application user does require the sysdba privilege - don't ask me why, I didn't write it, I won't defend it...)
So I checked the alert log but unfortunately I had to realize that there is no difference between an automatic switch and a manual one (only alter system archive log... does get an extra line).
So my questions are:
1) Does anybody know a way of distinguishing between an automatic log switch and a manual one? Is there a table or another logfile where this information is recorded?
2) Has anybody experienced a similar situation where Oracle is switching the logs way before reaching the maximum size?
Best regards,
Marcus

lebigmac wrote:
1) Does anybody know a way of distinguishing between an automatic log switch and a manual one? Is there a table or another logfile where this information is recorded?
Off the top of my head - I think the only way to do a manual log switch is to issue "alter system switch log file", and I think that any "alter system" command is written to the alter log in you version of Oracle. (I really ought to check both statements before posting this, but I've been up since 2:30 am).
2) Has anybody experienced a similar situation where Oracle is switching the logs way before reaching the maximum size?
It's very common with recent versions of Oracle when private redo threads come into play; but your example seems a little exaggerated. The log file switch has to start when there is enough space left in the log file for all the public and all (or maybe it's the previously used - i'll have to check my book) private redo threads. You could check x$kcrfstrand to see what this sizes look like: http://jonathanlewis.wordpress.com/?s=private+thread
Regards
Jonathan Lewis

FAST_START_MTTR_TARGET and checkpoint

DB version : 11.2
If I set
FAST_START_MTTR_TARGET=0
LOG_CHECKPOINT_INTERVAL=0
LOG_CHECKPOINT_TIMEOUT=1800Then how often does checkpoint occurs ? -- ignoring Manual log switch and ALTER SYSTEM CHECKPOINT command

TeslaMan wrote:
DB version : 11.2
If I set
FAST_START_MTTR_TARGET=0
LOG_CHECKPOINT_INTERVAL=0
LOG_CHECKPOINT_TIMEOUT=1800Then how often does checkpoint occurs ? -- ignoring Manual log switch and ALTER SYSTEM CHECKPOINT commandThese parameter affects the checkpoints, but if you are thinking that why checkpoint occurs when I am having above setting then, you are bit confused, because happening of checkpoint is another thing and having the values of the above parameter is different. When your current redo log becomes full, then there will be logswitch and logswitch is the cause of checkpoint. Checkpoint automatically occurs at a log switch.
Now if the question is why there is so much log switch, then simple answer is generation of more redo, more transactions. Further question turns into different direction that why there is more redo generation and its answer is far away from this current one.
Regards
Girish Sharma

How to install Oracle 11g R2 Express Edition in Arch 64?

Does anybody know how to do that?
The AUR website has a package for the beta version of Oracle 11g R2 Express Edition (https://aur.archlinux.org/packages.php?ID=48366), but somebody commented that it had some problem.
After a few months, I think it's easier to install centos 6.2 in a virtual box and install Oracle 11g there.
Last edited by dxxvi (2012-06-06 20:57:36)

By default Chinese language will be selected, you can also add english language from the left panel where you find list of languages. Then drag drop English to right panel and click next to continue with your installation.

Log switch and checkpoint - Oracle 11g

Similar Messages

Maybe you are looking for