Increasing LGWR processes

is there a way to increase the number of background log writer processes in oracle 10g on unix platform

You are approaching this matter from the wrong end.
In a properly configured system, with a properly written application, this wouldn't have been a problem.
You need to make sure your online redologs are properly sized, and they are on proper disk devices (which means they shouldn't be located on a RAID-5 device, and they should be multiplexed).
You also need to make sure your application doesn't generate too much redo (which means the developers didn't index every column in every table to avoid full table scans).
If you look at it: increasing the number of background processes wouldn't help, as the amount of I/O would remain the same. The number of disks would remain the same. And the write penalty associated with RAID-5 wouldn't go away.
In short, yes it is possible, using undocumented parameters, so only at direction of Oracle Support, and no, it is not going to help.
Sybrand Bakker
Senior Oracle DBA

Similar Messages

DBWR / LGWR PROCESSES

Hi,
On what basis dbwr processes and lgwr processes should be increased. Please give me clear understanding of the same. How to identify need of dbwr and lgwr processes should be increased as well how many it should be increased

check :
http://www.dba-oracle.com/t_dbwr_database_writer_tuning_tips.htm
lgwr can be increase pr not

Increase work process to specific Reports..

HI
is it possible to increase work process time to specifi report, becasue i am getting below error while running the report
The program "SAPLKARS" has exceeded the maximum permitted runtime without
interruption and has therefore been terminated.
After a specific time, the program is terminated to make the work area
available to other users who may be waiting.
This is to prevent a work area being blocked unnecessarily long by, for
example:
- Endless loops (DO, WHILE, ...),
- Database accesses with a large result set
- Database accesses without a suitable index (full table scan)
The maximum runtime of a program is limited by the system profile
parameter "rdisp/max_wprun_time". The current setting is 600 seconds. If this
time limit is
exceeded, the system attempts to cancel any running SQL statement or
signals the ABAP processor to stop the running program. Then the system
waits another 60 seconds maximum. If the program is then still active,
the work process is restarted.
please get me the solution asap
thanks By engli

You can set rdisp/max_wprun_time this value dynamically and chage it back to original value after your report is finished.
before you start your reoprt or program do this,
T-CODE --> RZ11 --> rdisp/max_wprun_time --> change value --> new value --> hit OK.
After your report is finished you can switch back to old value.
Regards
SM.

BW 3.x : Increase Background processes for one loading

Hello,
in BW 3.x, I must load cube1 into cube2 (cube2 is a cube1's copy). => During loading, time process is due to writing fact table.
I decrease parameter (infopackage parameter), in order to increase performance :
Maximum size of a data packet in kByte
I want to increase parallel processes in order to increase performance again (Data volume is so important). But How to increase this parameter : "Maximum number of dialog processes for sending data".
Thanks in advance for your help.
Best Regards,

See note 631710.
Or you can increase it at system source level (transaction SBIW/Main settings).
Regards,
Fred
Edited by: FCI on Apr 28, 2009 6:02 PM

Increase Apply Process Performance

Dear All,
I want to know how can I increase Apply Process Performance in Oracle Streams Setup.
I use Windows 2003 and Oracle 10g R2

Check metalink Note:335516.1
HTH...

ORA-00205 error leading to ORA-00470 LGWR process terminated with error.

Hello Gurus,
One of our database had gone down, I tried to bring it up. When tried to do so it gave follwoing errot ORA-00205 error in identifying control file, check alert log ..... When I checked alter log entried I found a new error ORA-00470 LGWR process terminated with eror.
All my control files are intact where supposed to be, so are all redo log files. Please could any would help parity at my end.
In need for restoring my database at the earliest.
Regards
Shiva

Could you please post the full alert.log contents when the database starts up ?
Are you really sure that all your control files are OK ?
ORA-00205 error in identifying controlfile, check alert log for more info
Cause: The system could not find a control file of the specified name and size.
Action: One of the following:
Check that the proper control file name is referenced in the CONTROL_FILES initialization parameter in the initialization parameter file and try again.
When using mirrored control files, that is, more than one control file is referenced in the initialization parameter file, remove the control file name listed in the message from the initialization parameter file and restart the instance. If the message does not recur, remove the problem control file from the initialization parameter file and create another copy of the control file with a new file name in the initialization parameter file.

ORA-00470: LGWR process terminated with error

Hi,
Often we are getting the following error on our 10g instance.
ORA-00470: LGWR process terminated with error
Mon Sep 6 22:47:53 2010
PMON: terminating instance due to error 470
Instance terminated by PMON, pid = 16986
And checked in /var/log/messages showing the following
kernel: Out of Memory: Killed process 16995 (oracle)
How can I solve this?
Thanks,
KAvitha

Hi,
I am using 10g database on Red Hat Enterprise Linux AS release 4 (Nahant Update 4).
The alert log showing the following information.
Mon Sep 6 23:09:45 2010
Completed: ALTER DATABASE OPEN
Mon Sep 6 23:17:30 2010
Errors in file /d04/u02/oracle/admin/cidb/bdump/cidb_pmon_19969.trc:
ORA-00470: LGWR process terminated with error
Mon Sep 6 23:17:30 2010
PMON: terminating instance due to error 470
Termination issued to instance processes. Waiting for the processes to exit
Mon Sep 6 23:17:44 2010
Instance termination failed to kill one or more processes
Instance terminated by PMON, pid = 19969
And also check cidb_pmon_19969.trc file
/d04/u02/oracle/admin/cidb/bdump/cidb_pmon_19969.trc
Oracle Database 10g Enterprise Edition Release 10.2.0.2.0 - Production
With the Partitioning, OLAP and Data Mining options
ORACLE_HOME = /d04/u02/oracle/cidb
System name: Linux
Node name: sflxdb07.donerus.com
Release: 2.6.9-34.ELsmp
Version: #1 SMP Fri Feb 24 16:54:53 EST 2006
Machine: i686
Instance name: cidb
Redo thread mounted by this instance: 1
Oracle process number: 2
Unix process pid: 19969, image: [email protected] (PMON)
*** 2010-09-06 23:17:30.676
*** SERVICE NAME:(SYS$BACKGROUND) 2010-09-06 23:17:30.530
*** SESSION ID:(170.1) 2010-09-06 23:17:30.530
Background process LGWR found dead
Oracle pid = 6
OS pid (from detached process) = 19977
OS pid (from process state) = 19977
dtp = 0x2000bab8, proc = 0x8b2b13fc
Dump of memory from 0x2000BAB8 to 0x2000BAE4
2000BAB0 00000074 8B2B13FC [t.....+.]
2000BAC0 00000000 00000000 5257474C 00000200 [........LGWR....]
2000BAD0 00004E09 113B6215 00000001 2AD428DC [.N...b;......(.*]
2000BAE0 00040001 [....]
Dump of memory from 0x8B2B13FC to 0x8B2B19B4
8B2B13F0 00000102 [....]
8B2B1400 00000000 00000000 00000000 00000000 [................]
8B2B1410 89555C60 8B82DB2C 8B3C2078 8B82CBEC [`\U.,...x <.....]
8B2B1420 00000000 8B82CC50 8B82CC50 8B82DB20 [....P...P... ...]
8B2B1430 00000601 8B3AE848 8B3C2078 00000006 [....H.:.x <.....]
8B2B1440 00000000 00000000 00000000 8B4D2F48 [............H/M.]
8B2B1450 8B4D2FE4 00000000 00000000 00000000 [./M.............]
8B2B1460 00000000 00000000 00000000 00000000 [................]
Repeat 2 times
8B2B1490 00000000 00000000 00030000 00000000 [................]
8B2B14A0 00030000 00000000 00000000 00000000 [................]
Repeat 1 times
8B2B17B0 00000000 00000000 00000014 4E4B4E55 [............UNKN]
8B2B17C0 004E574F 00000000 00000000 00000000 [OWN.............]
8B2B17D0 00000000 00000000 00000000 00000008 [................]
8B2B17E0 37393931 00000037 00000000 00000000 [19977...........]
8B2B17F0 00000000 00000000 00000005 6361726F [............orac]
8B2B19B0 00000006 [....]
error 470 detected in background process
ORA-00470: LGWR process terminated with error
*** 2010-09-06 23:17:44.081
Instance termination failed to kill one or more processes
ksuitm_check: OS PID=20017 is still alive
*** 2010-09-06 23:17:44.083
Dumping diagnostic information for [email protected] (J002):
OS pid = 20017
loadavg : 63.67 22.12 10.45
memory info: free memory = 0.00M
swap info: free = 0.00M alloc = 0.00M total = 0.00M
F S UID PID PPID C PRI NI ADDR SZ WCHAN STIME TTY TIME CMD
ERROR: process 20017 is not alive
*** 2010-09-06 23:17:44.814
Thanks,
Kavitha

LGWR process terminated with error

Hi,
I am currently running two Oracle 10G instances from a single Solaris
M4000 server. Every few days one of the instances crashes with the
following error and has to be restarted.
ORA-00470: LGWR process terminated with error
PMON: terminating instance due to error 470
I have spend weeks running various trace files etc with Oracle support
and they are basically clueless as to what is the cause. They are
saying it is a Solaris OS issue but surely this would affect both
instances and not just one.
Essentially something is killing the LGWR process and the instance is
shutting itself down. I think the way ahead is to try and find out
what is killing this process but I'm not sure how to go about this and
worried that any logging may degrade server performance.
Can anybody offer any suggestions ?
Regards
Sandeep

user13100082 wrote:
Hi,
I am currently running two Oracle 10G instances from a single Solaris
M4000 server. Every few days one of the instances crashes with the
following error and has to be restarted.
ORA-00470: LGWR process terminated with error
PMON: terminating instance due to error 470Hi Sandeep,
Sometimes it is really hard to find out RCA for an incident.
Because sometimes we dont have proper trace files to diagnose it fully.
May be you can sit with SA to find out is there anything wrong at OS level may be you might be reaching some resource limit at OS level.
Also is this is the first time the issue happened or have you faced this earlier also .
I had faced similar issue with oracle 8.1.7.4 on solaris . Later on , after suggestion from OSS , we changed redo logfiles location though as per SUN SA , there was no issue in that mount point.
May be you try this out i.e. changing redo logfiles location.
I would suggest you to ask OSS persons for some measure or may be any kind of tracing which might help , if the issue reappears.
Regards
Rajesh

Increase enqueue process

Hi,
i have one enqueue process in my ECC server. i want to increase the process from one to two.
plz suggest.
regards,
krushna ch Nayak

Dear Milind
SAP has not recomended to increase more then One enque for one SAP R/3.
Enque work process maintain the locking machanizam for entire R/3.
regards
Bandla

How do I increase the processing speed on my Pro Retina in Final Cut ProX?

I have a 2012 pro retina w/ 16 GB, I am trying to make a time lapse video in FinalCut w/ appx 10,000 stills shot at 1080 on a GoPro. I know this is a lot and life would be a lot easier w/ a Thunderbolt. I'm using CleanMyMac2 to free up some space and am moving the nearly 80 GB of photos onto a 1TB external to see if that speeds processing up a bit.
Any other thoughts/suggestions on increasing speed?

You can't use Disk Utility to securely erase a Solid State Disk drive, because of the fact that SSD's have limited write capability, unlike hard drives, thus have to protect the sectors from as little writes as possible.
In fact TRIM (wear leveling) is enabled to write new data to the least used sectors on a SSD each time.
The NSA guidelines for secure data destruction on SSD's is to grind them into a fine powder.
If you don't require this level of data destruction, you can do this trick below, but not often or you'll premaurely wear out your SSD.
Finder > Duplicate a small file repeatly in a folder until slightly more than 50% of the remaining free space on the SSD is used up, (use Activity Monitor) then delete this folder.
Then duplicate a different small file repeatly in another folder in the same manner.
What this will do is, because of the small file, OS X will fill the smallest unused spots on the SSD, the duplicates will fill the remaining free space half way, then the second folder will (because of TRIM) fill the other remaining 50% of the free space.
You can't fill your boot drive or the machine can refuse to function or boot, but because of the wear leveling this should overwrite all your available free space on the SSD once.
If you have a laptop and TimeMachine, there is a hidden database on the boot drive which will store a copy of the deleted data.
Then there is "versions" and it's possible a copy of the deleted data is stored in that cache file still on the SSD.
I can advise how to delete the TimeMachine backup file on the boot drive, but not the "versions" database or what it contains.
How do I securely delete data from the machine?
If your really paranoid it's likely best to reformat the entire MacintoshHD partition from recovery and then with a new user, then do the Finder > Duplicate procedure to overwrite the deleted data off the SSD, this way the "versions" and TimeMachine databases are also overwritten.
Nothing is safe anymore.

How to increase ims_master process number ?

Hi,
We are running:
Oracle Communications Messaging Server 7u4-23.01(7.0.4.23.0) 64bit (built Aug 10 2011)
libimta.so 7u4-23.01 64bit (built 17:01:27, Aug 10 2011)
Using /opt/sun/comms/messaging64/config/imta.cnf (compiled)
SunOS store1.unige.ch 5.10 Generic_138888-05 sun4u sparc SUNW,SPARC-Enterprise
and I would have wished to increase ims_master number of processes from 2 to 4.
Here's my channel definition in imta.cnf:
ims-ms defragment subdirs 20 notices 1 4 8 12 16 backoff "pt5m" "pt10m" "pt30m" "pt1h" "pt2h" "pt4h" maxjobs 4 pool IMS_POOL fileinto $U+$S@$D
ims-ms-daemon
I have also this configuration in my job_controller.cnf:
[POOL=IMS_POOL]
job_limit=4
However this don't do the job.
Can you tell me what's wrong in my configuration ?
Thanks by advance,
PL

job_controller starts ims_master processes as needed per threaddepth and the incoming load. So increasing maxjobs/job_limit will not cause more ims_master processes until job_controller finds the need for them.
Also note that ims_master shuts down relatively soon after it finds there is no more work for it. So it is perfectly normal for the number of ims_master processes to fluctuate and to see "shutting down" and "starting up" messages in the "imta" log file.

Need to increase max process in the init file. Please check and correct me

Friends,
We have Oracle9iR2 database in the RHEL AS 3.0 box.
Sometimes we are getting ORA-00020, means the max process is reached.
We have planned to increase the max process from 150 to 250 in the init.ora file.
i think the init.ora will be in /u01/app/oracle/admin/ourdb/pfile/
correct me if i am wrong......
Step1: vi init.ora file and change the process from
processes=150
to
processes=250
while the database is running.
Step2:shutdown the database and start the database.
is there only 2 steps or i have to shutdown the db at the beginning itself?
Or i have to take any precautions. Our server is HP ML-370 with dual processor.
Thanks
Sathyguy

hi sathy
SQLNET.AUTHENTICATION_SERVICES
Purpose
Use the parameter SQLNET.AUTHENTICATION_SERVICES to enable one or more authentication services. If authentication has been installed, it is recommended that this parameter be set to either none or to one of the authentication methods.
Default
None
Values
Authentication Methods Available with Oracle Net Services:
none for no authentication methods. A valid username and password can be used to access the database.
all for all authentication methods
nts for Windows NT native authentication
SQL> conn hr as sysdba
Enter password:
Connected.
SQL>--change sqlnet.ora ( authentication setting to 'NONE')
SQL> conn hr as sysdba
Enter password:
ERROR:
ORA-01031: insufficient privileges
Warning: You are no longer connected to ORACLE.
SQL> conn sys as sysdba
Enter password:
Connected.
SQL> show user
USER is "SYS"
SQL>
set processes parameter through two methods
first.
SQL> conn sys as sysdba
Enter password:
Connected.
SQL> show parameter spfile
NAME                                 TYPE        VALUE
spfile                               string      D:\ORACLE\DB_1\DATABASE\SPFILE
                                                 ORCL.ORA
SQL> show parameter processes
NAME                                 TYPE        VALUE
aq_tm_processes                      integer     0
db_writer_processes                  integer     1
gcs_server_processes                 integer     0
job_queue_processes                  integer     10
log_archive_max_processes            integer     2
processes                            integer     150
SQL> alter system set processes = 175 scope=spfile;
System altered.
SQL> show parameter processes
NAME                                 TYPE        VALUE
aq_tm_processes                      integer     0
db_writer_processes                  integer     1
gcs_server_processes                 integer     0
job_queue_processes                  integer     10
log_archive_max_processes            integer     2
processes                            integer     150
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.
Total System Global Area 171966464 bytes
Fixed Size                   787988 bytes
Variable Size             145488364 bytes
Database Buffers           25165824 bytes
Redo Buffers                 524288 bytes
Database mounted.
Database opened.
SQL> show parameter spfile
NAME                                 TYPE        VALUE
spfile                               string      D:\ORACLE\DB_1\DATABASE\SPFILE
                                                 ORCL.ORA
SQL> show parameter processes
NAME                                 TYPE        VALUE
aq_tm_processes                      integer     0
db_writer_processes                  integer     1
gcs_server_processes                 integer     0
job_queue_processes                  integer     10
log_archive_max_processes            integer     2
processes                            integer     175
SQL>
second method.
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> create pfile from spfile;
File created.
SQL> startup pfile=D:\oracle\Db_1\database\initorcl.ora
ORACLE instance started.
Total System Global Area 171966464 bytes
Fixed Size                   787988 bytes
Variable Size             145488364 bytes
Database Buffers           25165824 bytes
Redo Buffers                 524288 bytes
Database mounted.
Database opened.
SQL> show parameter spfile
NAME                                 TYPE        VALUE
spfile                               string
SQL> show parameter processes
NAME                                 TYPE        VALUE
aq_tm_processes                      integer     0
db_writer_processes                  integer     1
gcs_server_processes                 integer     0
job_queue_processes                  integer     10
log_archive_max_processes            integer     2
processes                            integer     175
SQL> --- now my database is start through pfile instead of spfile and i will
SQL> -- change in pfile again processes parameter 150.
SQL> show parameter processes
NAME                                 TYPE        VALUE
aq_tm_processes                      integer     0
db_writer_processes                  integer     1
gcs_server_processes                 integer     0
job_queue_processes                  integer     10
log_archive_max_processes            integer     2
processes                            integer     175
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup pfile=D:\oracle\Db_1\database\initorcl.ora
ORACLE instance started.
Total System Global Area 171966464 bytes
Fixed Size                   787988 bytes
Variable Size             145488364 bytes
Database Buffers           25165824 bytes
Redo Buffers                 524288 bytes
Database mounted.
Database opened.
SQL> show parameter processes
NAME                                 TYPE        VALUE
aq_tm_processes                      integer     0
db_writer_processes                  integer     1
gcs_server_processes                 integer     0
job_queue_processes                  integer     10
log_archive_max_processes            integer     2
processes                            integer     150
SQL>
1. Why can't i just edit the init.ora file to change the processes=250 while the db is running?
you can edit the init.ora file.
If i edit the init.ora file by shutting down the db will there any problem
not problem
init.ora file is text file you can edit easly
spfilesid.ora file is binary file you can not edit directly ... if you want to edit spfile file first change in pfile then create spfile from pfile...
hope this helps
Taj.

How to increase JVM Process size for WebLogic running SOA Applications.

Hi,
I believe 32 Bit OS can address up to 4GB memory so theoretically 32 Bit JVM can use 4GB but practical convention is 2GB as other 2GB is used by OS itself and also this default JVM Process size is set somewhere and I also believe that if JVM is 32 bit on 64Bit OS even though JVM will run on 32Bit Virtual Machine so JVM does not know that it is 64Bit OS in that case again it can use max Process default size up to 2GB.
And for 64Bit JVM, I can allocate more than 4GB depend on my available RAM size to Xmx, MaxPermSize parameters in java.exe file and after that I can set the same value in “setSOADomainEnv.cmd” or to “setDomainEnv.cmd” file.
But I am 99% sure by just assigning more memory value to Xmx, MaxPermSize in “setSOADomainEnv.cmd” file only won’t work (not setting Xmx in java.exe), if it would have worked then in my case when I was assigning 1536 to Xmx in “setSOADomainEnv.cmd” file then why it was showing out of memory error. I think that is because it was only taking default 2GB for my 32 Bit JVM not considering 3GB or 4GB. So i think i have to change default memory size what JVM can use (<http://www.wikihow.com/Increase-Java-Memory-in-Windows-7> but i am using windows 8 so for that I don’t know the option to change this default Process Size)
I also believe that first JVM start and before start it check how much memory it can use from it’s own –Xmx parameter in some ware configuration or java.exe file and after that it allocate that much size of JVM Process Memory in RAM then after it loads Weblogic or Java Applications in its (Heap + Non-heap + Native Area) which are parts of JVM Process memory
I read post on :< http://stackoverflow.com/questions/3143579/how-can-jvm-use-more-than-4gb-of-memory > and < http://alvinalexander.com/blog/post/java/java-xmx-xms-memory-heap-size-control >
All used :
java -Xmx64m -classpath ".:${THE_CLASSPATH}" ${PROGRAM_NAME}
java –Xmx6g //command which will call java/JVM interpreter which will hold –Xmx parameter to set Heap size for JVM
before JVM comes in memory (JVM process memory)
now my question is can I manually open any configuration file or java.exe same like “setSOADomainEnv.cmd” or “setDomainEnv.cmd” (I know since java.exe is exe I can’t open simply but I want similar work around)
so that I don’t need to type java –Xmx6g every time when I run weblogic (and then later I can change weblogic “setDomainEnv.cmd” Xmx and PermSize to more than default size 4GB to 5GB or 6GB in the case of 64Bit OS)
Please correct me if I am wrong in my understanding.
Thanks.

These days the VM will detect a "server" machine and set up the memory appropriate for that.
You can create a simple java console application and have it print the memory settings (find the appropriate java class fort that.)
There is of course the possibility that your application is running out of memory because it is doing something wrong and not because the VM doesn't have enough memory. You can force that in a test setup by LOWERING the maximum amount of memory and thus making it more likely that an out of memory exception will occur.

Can we increase work process?

Hi frds,
We are using Itanium servers with 8GB RAM. How many work process can be increased for this server.
Regards,
Nageshwar

Nageshwar
6 dialog, 3 backgrounds, 2 update (v1 n v2), 1spool and 1 enqueue, even for a development system is small. Increase the number of background to at least 5.
4-6 WP per CPU is not valid anymore.
Itanium processor has a power of 800 to 1400 SAPS depending of the model. Plus they are multithreading, multi-core...
One rule of thumbs is to have 1 dialog process for 5 concurrent users. However, some applications consume more dialogs than others (reporting, PI-Sheets,).
Also, keep in mind that you should limit the number of process per application instance to 50. So, I you plan to have more process, plan to have other application instances.
If you want more information, please give more details (SAP product? Version? Number of concurrent users? .)
Thanks in advance.
Frank Markarian
SAP America

Who writes LOG SEQUENCE NUMBER to CONTROL FILE,whether CKPT or LGWR process

I am in confusion that,
When log switch occurs that time Log sequence no. is generated by LGWR. then after who writes that LSN to CONTROL FILE whether Checkpoint or LGWR.
Please provide me proper answer with example.....

I notice by using fuser on a controlfile on hp-ux, a number of processes keep the controlfile open. So it would make sense that the one that writes logs would write log sequence numbers to the controlfile too.
$ for z in `/usr/sbin/fuser control03.ctl|awk ' {x=split($0,args); for (i=2;i<=x;i++){print args[i]}}'`
        do
            ps -efx|grep $z|grep -v grep
        done
control03.ctl: oooooooooo
oracle 27129     1 0 Sep 5 ?        12:15 ora_arc1_TPRD
oracle 27073     1 0 Sep 5 ?        52:45 ora_dbw0_TPRD
oracle 27127     1 0 Sep 5 ?        10:52 ora_arc0_TPRD
oracle 9485     1 0 Nov 3 ?         9:14 oracleTPRD (LOCAL=NO)
oracle 22395     1 0 08:36:22 ?         0:24 oracleTPRD (LOCAL=NO)
oracle 27075     1 0 Sep 5 ?        68:53 ora_lgwr_TPRD
oracle 22116     1 0 08:33:24 ?         1:06 oracleTPRD (LOCAL=NO)
oracle 27077     1 0 Sep 5 ?        41:05 ora_ckpt_TPRD
oracle 26510     1 0 Nov 30 ?        21:26 oracleTPRD (LOCAL=NO)

Increasing LGWR processes

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