Doubt on initialization parameter in RAC

Hi Gurus,
Can somebody explain the intention behind this kind of setting in cluster database ?
I know when sga_target or memory_target is set ,the db_cache_size configured at instance level will act as the lower limit .
Then what is meant by remaining setting ? *.__db_cache_size= and PDOSB.__db_cache_size
*.__db_cache_size=608M
PDOSB.__db_cache_size=620756992
PDOSB2.__db_cache_size=10200547328
PDOSB3.__db_cache_size=9999220736
PDOSB1.__db_cache_size=10401873920
Thanks in advance,
Mahi

Hi,
>>Then what is meant by remaining setting ? *.__db_cache_size= and PDOSB.__db_cache_size
it means the parameter value are managed by the database automatically. The size *.__db_cache_size=608M, i.e. 608M is the last size allocated to that component.
* - means it was across all instances.
PDOSB.__db_cache_size=620756992 - means it specifies the size for PDOSB instance.
HTH,
Pradeep

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ORA-02095: specified initialization parameter cannot be modified

Oracle : 10.2.0.4
I am getiing below error while setting this parameter in one of teh RAC instance.
ORA-02095: specified initialization parameter cannot be modified
Is there any solution for that ?
Thx.

Have a look here:
http://download.oracle.com/docs/cd/E11882_01/server.112/e10820/initparams262.htm#REFRN10230
If you query the V$SYSTEM_PARAMETERS you can get a "quick help" because the columns are self documenting.
I don't use RAC, but in single instance server you must stop the DB, modify the utl_file_dir, and restart.
I think it's the same for a RAC...
Bye,
Antonio

Where is the Database Initialization Parameter file (inti.ora ??) located ?

I have E-Business Suite R12 installed on Windows XP.
I want to change utl_file_dir path.
I know that I have to change the Database Initialization Parameter file (inti.ora ??)
Does anybody know, where is the file located ?
When I search I am getting two files. (init.ora and init.ora.txt)
Which file I need to make the changes in ???
Thanks in advance

The initialization file for the database is located in the $ORACLE_HOME/dbs directory, and is called init<SID>.ora

Initialize parameter in server side

hi
How i can set initialize parameter in server side, such as nls_language, and set it to default for all sessions.
thanks.

Majid,
use the default.env file in teh forms90/server directory
Frank

How come I can not change the initialization parameter

show parameters audit_trail
NAME TYPE VALUE
audit_trail string NONE
alter system set audit_trail = true
ERROR at line 1:
ORA-02095: specified initialization parameter cannot be modified
I am using windows XP professional, Oracle9i Enterprise Edition Release 9.2.0.1.0 - Production
sqlplus sheet
How to change the parameter like this?
Edited by: user8117130 on May 4, 2009 9:23 AM

user8117130 wrote:
show parameters audit_trail
NAME TYPE VALUE
audit_trail string NONE
alter system set audit_trail = true
ERROR at line 1:
ORA-02095: specified initialization parameter cannot be modified
I am using windows XP professional, Oracle9i Enterprise Edition Release 9.2.0.1.0 - Production
sqlplus sheet
How to change the parameter like this?
Edited by: user8117130 on May 4, 2009 9:23 AMHi,
This is a static parameter which means you can't change it when the db is running. If you are using an spfile, you need to change the query as ,
alter system set audit_trail=true scope=spfileAnd then give a bounce to your db. If you are usnig a parameter file, than change in that and restart.
http://download.oracle.com/docs/cd/B10501_01/server.920/a96536/ch112.htm#REFRN10006
HTH
Aman....

Doubts about shared disk for RAC

Hi All,
I am really new to RAC.Even after reading various documents,I still have many doubts regarding shared storage and file systems needed for RAC.
1.Clusterware has to be installed on a shared file system like OCFS2.Which type of hard drive is required to install OCFS2 so that it can be accessed from all nodes??
It has to be an external hard drive???Or we can use any simple hard disk for shared storage??
If we use external hard drive then does it need to be connected to a seperate server alltogether or can it be connected to any one of the nodes in the cluster???
Apart from this shared drives,approximately what size of hard disk is required for all nodes(for just a testing environment).
Sincerely appreciate a reply!!
Thanks in advance.

Clusterware has to be installed on shared storage. RAC also requires shared storage for the database.
Shared storage can be managed via many methods.
1. Some sites using Linux or UNIX-based OSes choose to use RAW disk devices. This method is not frequently used due to the unpleasant management overhead and long-term manageability for RAW devices.
2. Many sites use cluster filesystems. On Linux and Windows, Oracle offers OCFS2 as one (free) cluster filesystem. Other vendors also offer add-on products for some OSes that provide supported cluster filesystems (like GFS, GPFS, VxFS, and others). Supported cluster filesystems may be used for Clusterware files (OCR and voting disks) as well as database files. Check Metalink for a list of supported cluster filesystems.
3. ASM can be used to manage shared storage used for database files. Unfortunately, due to architecture decisions made by Oracle, ASM cannot currently be used for Clusterware files (OCR and voting disks). It is relatively common to see ASM used for DB files and either RAW or a cluster filesystem used for Clusterware files. In other words, ASM and cluster filesystems and RAW are not mutually exclusive.
As for hardware--I have not seen any hardware capable of easily connecting multiple servers to internal storage. So, shared storage is always (in my experience) housed externally. You can find some articles on OTN and other sites (search Google for them) that use firewire drives or a third computer running openfiler to provide the shared storage in test environments. In production environments, SAN devices are commonly employed to provide concurrent access to storage from multiple servers.
Hope this helps!
Message was edited by:
Dan_Norris

Doubt in set parameter

hi,
can anyone tel me wat is error in this coding
AT LINE-SELECTION.
DATA: g(30),
ref_parameter(30) VALUE 'parameter by reference',
val_parameter(30) VALUE 'parameter by value',
field_symbol LIKE itab-lifnr.
FIELD-SYMBOLS: <f> TYPE ANY.
ASSIGN itab-lifnr TO <f>.
GET CURSOR FIELD g.
SET PARAMETER ID 'LIF' FIELD itab-lifnr.
CALL TRANSACTION 'ZAZU'." AND SKIP FIRST SCREEN.
Im not getting the corresponding value in the parameter it is not setting into the parameter box wat is the er

zubair,
Check like below.
SET PARAMETER ID 'LIF' FIELD field_symbol.
Don't forget to reward if useful.

FAST_START_MTTR_TARGET initialization parameter.... in Ora10g

Hi ,
Can you please clarify the following...???
"FAST_START_MTTR_TARGET enables the definition of the number of seconds the database takes to perform crash recovery of a single instance".
The above means that if this parameter is set to 0 then the database will be operational again - after the successful recovery process- after 0 seconds... meaning instantly ....and if set to 3600 (the maximum value) then the database will be operational again after an hour....?????
Many thanks,
Sim

Setting this to 0 will disable MTTR advisory.
http://download.oracle.com/docs/cd/B10501_01/server.920/a96533/instreco.htm#445433

Problem in Initialization Parameter file...Oracle10g

Hi all,
I am working in oracle 10g.I created a pfile from an exiting spfile and changed the Processes parameter and then again created a spfile from this changed pfile.
Didnt delete the previous spfile and bounced the database.
At startup I encountered the error:ORA-01092.
Could any one suggest a solution and reason for the same.
Thanks and regards,
Nupur

You can always mention the location where u want ur spfile to be created while creating it from sqlprompt.
If u dont specify the path then it will create in
"$ORACLE_HOME/dbs"..
When the oracle instance is started,it looks for the parameter file in the following order....
1) spfileSID.ora
2) default spfile
3) initSID.ora
4) default pfile
so even if u dont mention Pfile while startup and if u have an spfile the db will definitely start from spfile......

Conflict initialization parameter discription

there's confusion in the descrition of this parameters
"MAX_DISPATCHERS"
between 10.2g database reference & 10.2g database admin guide
1. 10.2g database reference says:
MAX_DISPATCHERS specifies the maximum number of dispatcher processes allowed
to be running simultaneously. It can be overridden by the DISPATCHERS parameter and is maintained for backward compatibility with older releases.
http://download-uk.oracle.com/docs/cd/B19306_01/server.102/b14237/initparams115.htm#sthref485
2. 10.2g database admin guide says:
MAX_DISPATCHERS: Specifies the maximum number of dispatcher processes that can run simultaneously. This parameter can be ignored for now. It will only be useful in a future release when the number of dispatchers is auto-tuned according to the number of concurrent connections.
http://download-uk.oracle.com/docs/cd/B19306_01/server.102/b14231/manproc.htm#sthref618
which one is right, they are totally opposite

I'm searching for a pattern from my GUI application. It displays results when I give something specific like jac* but when I search j*, it displays an error.
I'm told by the app support team that there is an Oracle setting called max_wildcard which when set, Oracle will search more records before throwing this error.

Database Initialization Parameter Setting - extrapolation on Load Testing

We have a new application going live, hence a new database instance need to be set. The oracle version is 10.2.0.5 (exisiting env. constraint)
The load testing is conducted for approx. 2000 user load. As per the test results, during the peak load, number of database sessions opened are 450. The expected user load is 5500 in production, hence we are expecting approx 1100 database sessions at that time.
Due to constraints in load testing environment, we cannot test for 6000 users in production. Hence, we have to extrapolate the database parameter settings and put in production.
The SGA sizing & some other parameters in Load Testing is as below (with the following setting in load, the performance is acceptable)
sga_max_size 7.5 GB
sga_target 6 GB
db_cache_size 3 GB
shared_pool_size 1.5 GB
shared_pool_reserved_size 150 MB
java_pool_size 0.2 GB
large_pool_size 0.5 GB
sort_area_size 0.5 MB
streams_pool_size 48 MB
pga_aggregate_target 4 GB
processes 1200
db_block_size 8K
db_file_multiblock_read_count 16
db_keep_cache_size 134217728
fast_start_mttr_target 600
open_links 25
Please let me know how to set the database size for production on extrapolation. Apart from processes and sessions, which are parameters I should be giving more focus.

user8211187 wrote:
We have a new application going live, hence a new database instance need to be set. The oracle version is 10.2.0.5 (exisiting env. constraint)
The load testing is conducted for approx. 2000 user load. As per the test results, during the peak load, number of database sessions opened are 450. The expected user load is 5500 in production, hence we are expecting approx 1100 database sessions at that time.
Due to constraints in load testing environment, we cannot test for 6000 users in production. Hence, we have to extrapolate the database parameter settings and put in production.
The SGA sizing & some other parameters in Load Testing is as below (with the following setting in load, the performance is acceptable)
sga_max_size 7.5 GB Upon which metrics was 7.5GB derived?

Initialization parameter won't stay set

Running into a stange issue for the first time. Anyone have ideas on what might be causing this?
DB - 10.2.0.4, Windows Sever 2008
Current setting for optimizercost_based_transformation = OFF. We want to set it to ON.
The following command is issue:
alter system set "_optimizer_cost_based_transformation"=on scope=both;
The database is bounced and the following is the result:
SQL> conn sys@uimdev as sysdba
Enter password: ***********
Connected.
SQL> alter system set "_optimizer_cost_based_transformation"=on scope=spfile;
System altered.
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.
Total System Global Area 5251268608 bytes
Fixed Size 2073080 bytes
Variable Size 1577061896 bytes
Database Buffers 3657433088 bytes
Redo Buffers 14700544 bytes
Database mounted.
Database opened.
SQL> show parameter _optimizer
NAME TYPE VALUE
optimizercost_based_transformation string ON
HERES THE PROBLEM:
When any other session is opened, the parameter values show a value of OFF again. For example:
SQL> select name,value from v$parameter where name like '_opt%';
NAME VALUE
optimizercost_based_transformation OFF
Anyone seen this type of behavior or know how to fix?
Thaks in advance for assistance....

Tony,
Have you reviewed the on-logon DB triggers?
The fact that you can see the hidden parameter in v$parameter means that someone/something sets it up (as opposed to using the default).
Since the value is not the one you have in the spfile, then there might be some other place it gets reverted to "OFF".
Hope that help,
Iordan Iotzov

Parameter changes in RAC

Hi,
We have two node RAC and presently up and running. We are going to set single node standby database for the two node RAC. We need to modify some initialization parameter in RAC. Is this possible to shutdown one instance and restart following this to restart second instance. So that RAC database will be available for the application without shutdown the RAC database and restart to reflect the initialization parameter.

Is this possible to shutdown one instance and restart following this to restart second instance.
It depends on the parameter(s) that is being changed. For most of them, yes, this is possible. But if your "primary" is not yet in archive log mode, then you'll need to issue the ALTER DATABASE command to start archiving and you'll don't want one instance up and running while the other is making the change.
Cheers,
Brian

Should I specify the Parallel parameter for an non-RAC database?

The Oracle documatation state as the following:
"The Oracle Database 10g Release 2 database controls and balances all parallel operations, based upon available resources, request priorities and actual system load." It show that Oracle can optimize the Parallel level automaticly.
Should I specify the Parallel parameter for a non-RAC database? Most of the transactions are small OLTP.

What parallel parameter are you talking about?
Generally, you may benefit from parallelization in a very similar manner on RAC as on single instance system. And it is in both cases not sufficient to change the value of any initialization parameter to achieve parallelization of queries, DDL or DML.
Kind regards
Uwe
http://uhesse.wordpress.com

SORT_AREA_SIZE parameter doubt

Hi guys,
My application connections use MTS and I´m trying to change dinamically the SORT_AREA_SIZE parameter and I´m getting a Oracle error
ALTER SYSTEM SET SORT_AREA_SIZE=1048576 SCOPE=BOTH;
ORA-02096
anybody knows why ?
oracle 9.2.0.8
the pga_aggregate_target parameter is configured to 160432128 , but as I´m using mts connections I would like to see if there´s any improvement in sorts performance changing SORT_AREA_SIZE parameter.
Thanks

The error message is pretty self explanatory,
ORA-02096: specified initialization parameter is not modifiable with this option
Cause: Though the initialization parameter is modifiable, it cannot be modified using the specified command.
Action: Check the DBA guide for information about under what scope the parameter may be modified
You can't change it with SCOPE=BOTH, change with SCOPE=SPFILE and restart to take effect.

Doubt on initialization parameter in RAC

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