Some initialization parameters

hi masters,
i was looking for documentation on some initialization parameter,
complexview_merging
pushjoin_union_view
but i didn't get a good one..
i would like to know for what purpose '_complex_view_merging' is used? as we all know that pushjoin_union_view
is used if your statement is having 'union all' clause..
i have to set these parameters for oracle 10g R2 on RHEL 4.7
do i need to set them?? or oracle 10g supports them?
any suggestions??
thanks and regards
VD

Paraphrased from "Cost-Based Oracle Fundamentals":
"_COMPLEX_VIEW_MERGING controls whether or not views are merged. By default, 9i merges the views without considering the cost, while 10g calculates the cost before considering the merge."
If you wish to understand the internals of Oracle's optimizer, the book mentioned above will be very helpful. The book is also very helpful in determining what to expect when moving from one release of Oracle to another.
Setting the parameter to false may have been an attempt to return to the behavior of Oracle 8i in regard to how views are optimized. The parameters beginning with _ should not be changed without the authorization of Oracle support (as already stated in this thread).
Charles Hooper
IT Manager/Oracle DBA
K&M Machine-Fabricating, Inc.
Edited by: Charles Hooper on Jan 31, 2009 9:02 AM
If memory serves me correct, in the above the term "view" is likely related to the handling of subqueries in the WHERE clause, and whether or not Oracle automatically transforms those subqueries into an equivalent form.

Similar Messages

Initialization parameters not getting populated correctly during DBCA

This problem is observed on Oracle 10.2.0.1 Linux x86 and RedHat Enterprise Linux 4 ES Update 5.
I tried to use DBCA template file to create an Oracle database (see below for the template file content). The DB creation was successful, but the initialization parameters did not get populated into /oracle/u01/app/oracle/admin/ora10g/pfile/init.ora the way I would expect.
ora10g.dbt template - file content
========================
<DatabaseTemplate name="ora10g" description="" version="10.2.0.0.0">
<CommonAttributes>
<option name="ISEARCH" value="false"/>
<option name="OMS" value="false"/>
<option name="JSERVER" value="true"/>
<option name="SPATIAL" value="false"/>
<option name="ODM" value="false">
<tablespace id="SYSAUX"/>
</option>
<option name="IMEDIA" value="false"/>
<option name="XDB_PROTOCOLS" value="false">
<tablespace id="SYSAUX"/>
</option>
<option name="ORACLE_TEXT" value="false">
<tablespace id="SYSAUX"/>
</option>
<option name="SAMPLE_SCHEMA" value="false"/>
<option name="CWMLITE" value="false">
<tablespace id="SYSAUX"/>
</option>
<option name="EM_REPOSITORY" value="true">
<tablespace id="SYSAUX"/>
</option>
<option name="HTMLDB" value="false"/>
</CommonAttributes>
<Variables/>
<CustomScripts Execute="false"/>
<InitParamAttributes>
<InitParams>
<initParam name="audit_file_dest" value="{ORACLE_BASE}/admin/{DB_UNIQUE_NAME}/adump"/>
<initParam name="background_dump_dest" value="{ORACLE_BASE}/admin/{DB_UNIQUE_NAME}/bdump"/>
<initParam name="compatible" value="10.2.0.1.0"/>
<initParam name="control_files" value="(“/u01/oradata/{DB_UNIQUE_NAME}/control01.ctl“, “/u02/oradata/{DB_UNIQUE_NAME}/control02.ctl“, “/u03/oradata/{DB_UNIQUE_NAME}/control03.ctl“)"/>
<initParam name="core_dump_dest" value="{ORACLE_BASE}/admin/{DB_UNIQUE_NAME}/cdump"/>
<initParam name="cursor_sharing" value="EXACT"/>
<initParam name="db_block_size" value="16384"/>
<initParam name="db_cache_size" value="1" unit="GB"/>
<initParam name="db_domain" value=""/>
<initParam name="db_file_multiblock_read_count" value="16"/>
<initParam name="db_name" value="ora10g"/>
<initParam name="job_queue_processes" value="10"/>
<initParam name="large_pool_size" value="0" unit="MB"/>
<initParam name="java_pool_size" value="0" unit="MB"/>
<initParam name="log_buffer" value="64000000"/>
<initParam name="open_cursors" value="300"/>
<initParam name="pga_aggregate_target" value="1" unit="GB"/>
<initParam name="processes" value="300"/>
<initParam name="recyclebin" value="off"/>
<initParam name="remote_login_passwordfile" value="EXCLUSIVE"/>
<initParam name="sessions" value="335"/>
<initParam name="sga_target" value="1600" unit="MB"/>
<initParam name="shared_pool_size" value="128" unit="MB"/>
<initParam name="sort_area_size" value="4194304"/>
<initParam name="transactions" value="610"/>
<initParam name="undo_management" value="AUTO"/>
<initParam name="undo_retention" value="10800"/>
<initParam name="undo_tablespace" value="UNDOTBS1"/>
<initParam name="user_dump_dest" value="{ORACLE_BASE}/admin/{DB_UNIQUE_NAME}/udump"/>
</InitParams>
<MiscParams>
<databaseType>MULTIPURPOSE</databaseType>
<maxUserConn>20</maxUserConn>
<percentageMemTOSGA>80</percentageMemTOSGA>
<customSGA>false</customSGA>
<characterSet>WE8ISO8859P1</characterSet>
<nationalCharacterSet>AL16UTF16</nationalCharacterSet>
<archiveLogMode>false</archiveLogMode>
<initParamFileName>{ORACLE_BASE}/admin/{DB_UNIQUE_NAME}/pfile/init.ora</initParamFileName>
</MiscParams>
<SPfile useSPFile="false">{ORACLE_HOME}/dbs/spfile{SID}.ora</SPfile>
</InitParamAttributes>
<StorageAttributes>
<ControlfileAttributes id="Controlfile">
<maxDatafiles>100</maxDatafiles>
<maxLogfiles>16</maxLogfiles>
<maxLogMembers>3</maxLogMembers>
<maxLogHistory>1</maxLogHistory>
<maxInstances>8</maxInstances>
<image name="control01.ctl" filepath="/u01/oradata/{DB_UNIQUE_NAME}/"/>
<image name="control02.ctl" filepath="/u02/oradata/{DB_UNIQUE_NAME}/"/>
<image name="control03.ctl" filepath="/u03/oradata/{DB_UNIQUE_NAME}/"/>
</ControlfileAttributes>
<DatafileAttributes id="/u01/oradata/{DB_UNIQUE_NAME}/sysaux01.dbf">
<tablespace>SYSAUX</tablespace>
<temporary>false</temporary>
<online>true</online>
<status>0</status>
<size unit="MB">500</size>
<reuse>true</reuse>
<autoExtend>false</autoExtend>
<increment unit="KB">10240</increment>
<maxSize unit="MB">-1</maxSize>
</DatafileAttributes>
<DatafileAttributes id="/u01/oradata/{DB_UNIQUE_NAME}/system01.dbf">
<tablespace>SYSTEM</tablespace>
<temporary>false</temporary>
<online>true</online>
<status>0</status>
<size unit="MB">500</size>
<reuse>true</reuse>
<autoExtend>false</autoExtend>
<increment unit="KB">10240</increment>
<maxSize unit="MB">-1</maxSize>
</DatafileAttributes>
<DatafileAttributes id="/u01/oradata/{DB_UNIQUE_NAME}/temp01.dbf">
<tablespace>TEMP</tablespace>
<temporary>false</temporary>
<online>true</online>
<status>0</status>
<size unit="MB">100</size>
<reuse>true</reuse>
<autoExtend>false</autoExtend>
<increment unit="KB">640</increment>
<maxSize unit="MB">-1</maxSize>
</DatafileAttributes>
<DatafileAttributes id="/u01/oradata/{DB_UNIQUE_NAME}/undotbs01.dbf">
<tablespace>UNDOTBS1</tablespace>
<temporary>false</temporary>
<online>true</online>
<status>0</status>
<size unit="MB">100</size>
<reuse>true</reuse>
<autoExtend>false</autoExtend>
<increment unit="KB">5120</increment>
<maxSize unit="MB">-1</maxSize>
</DatafileAttributes>
<TablespaceAttributes id="SYSAUX">
<online>true</online>
<offlineMode>1</offlineMode>
<readOnly>false</readOnly>
<temporary>false</temporary>
<defaultTemp>false</defaultTemp>
<undo>false</undo>
<local>true</local>
<blockSize>-1</blockSize>
<allocation>1</allocation>
<uniAllocSize unit="KB">-1</uniAllocSize>
<initSize unit="KB">64</initSize>
<increment unit="KB">64</increment>
<incrementPercent>50</incrementPercent>
<minExtends>1</minExtends>
<maxExtends>4096</maxExtends>
<minExtendsSize unit="KB">64</minExtendsSize>
<logging>true</logging>
<recoverable>false</recoverable>
<maxFreeSpace>0</maxFreeSpace>
<autoSegmentMgmt>true</autoSegmentMgmt>
<bigfile>false</bigfile>
<datafilesList>
<TablespaceDatafileAttributes id="/u01/oradata/{DB_UNIQUE_NAME}/sysaux01.dbf">
<id>-1</id>
</TablespaceDatafileAttributes>
</datafilesList>
</TablespaceAttributes>
<TablespaceAttributes id="SYSTEM">
<online>true</online>
<offlineMode>1</offlineMode>
<readOnly>false</readOnly>
<temporary>false</temporary>
<defaultTemp>false</defaultTemp>
<undo>false</undo>
<local>true</local>
<blockSize>-1</blockSize>
<allocation>1</allocation>
<uniAllocSize unit="KB">-1</uniAllocSize>
<initSize unit="KB">64</initSize>
<increment unit="KB">64</increment>
<incrementPercent>50</incrementPercent>
<minExtends>1</minExtends>
<maxExtends>-1</maxExtends>
<minExtendsSize unit="KB">64</minExtendsSize>
<logging>true</logging>
<recoverable>false</recoverable>
<maxFreeSpace>0</maxFreeSpace>
<autoSegmentMgmt>false</autoSegmentMgmt>
<bigfile>false</bigfile>
<datafilesList>
<TablespaceDatafileAttributes id="/u01/oradata/{DB_UNIQUE_NAME}/system01.dbf">
<id>-1</id>
</TablespaceDatafileAttributes>
</datafilesList>
</TablespaceAttributes>
<TablespaceAttributes id="TEMP">
<online>true</online>
<offlineMode>1</offlineMode>
<readOnly>false</readOnly>
<temporary>true</temporary>
<defaultTemp>true</defaultTemp>
<undo>false</undo>
<local>true</local>
<blockSize>-1</blockSize>
<allocation>2</allocation>
<uniAllocSize unit="KB">1024</uniAllocSize>
<initSize unit="KB">64</initSize>
<increment unit="KB">64</increment>
<incrementPercent>0</incrementPercent>
<minExtends>1</minExtends>
<maxExtends>0</maxExtends>
<minExtendsSize unit="KB">64</minExtendsSize>
<logging>false</logging>
<recoverable>false</recoverable>
<maxFreeSpace>0</maxFreeSpace>
<autoSegmentMgmt>true</autoSegmentMgmt>
<bigfile>false</bigfile>
<datafilesList>
<TablespaceDatafileAttributes id="/u01/oradata/{DB_UNIQUE_NAME}/temp01.dbf">
<id>-1</id>
</TablespaceDatafileAttributes>
</datafilesList>
</TablespaceAttributes>
<TablespaceAttributes id="UNDOTBS1">
<online>true</online>
<offlineMode>1</offlineMode>
<readOnly>false</readOnly>
<temporary>false</temporary>
<defaultTemp>false</defaultTemp>
<undo>true</undo>
<local>true</local>
<blockSize>-1</blockSize>
<allocation>1</allocation>
<uniAllocSize unit="KB">-1</uniAllocSize>
<initSize unit="KB">512</initSize>
<increment unit="KB">512</increment>
<incrementPercent>50</incrementPercent>
<minExtends>8</minExtends>
<maxExtends>4096</maxExtends>
<minExtendsSize unit="KB">512</minExtendsSize>
<logging>true</logging>
<recoverable>false</recoverable>
<maxFreeSpace>0</maxFreeSpace>
<autoSegmentMgmt>true</autoSegmentMgmt>
<bigfile>false</bigfile>
<datafilesList>
<TablespaceDatafileAttributes id="/u01/oradata/{DB_UNIQUE_NAME}/undotbs01.dbf">
<id>-1</id>
</TablespaceDatafileAttributes>
</datafilesList>
</TablespaceAttributes>
<RedoLogGroupAttributes id="1">
<reuse>false</reuse>
<fileSize unit="KB">1048576</fileSize>
<Thread>1</Thread>
<member ordinal="0" memberName="redo01.log" filepath="/u01/oradata/{DB_UNIQUE_NAME}/"/>
</RedoLogGroupAttributes>
<RedoLogGroupAttributes id="2">
<reuse>false</reuse>
<fileSize unit="KB">1048576</fileSize>
<Thread>1</Thread>
<member ordinal="0" memberName="redo02.log" filepath="/u02/oradata/{DB_UNIQUE_NAME}/"/>
</RedoLogGroupAttributes>
<RedoLogGroupAttributes id="3">
<reuse>false</reuse>
<fileSize unit="KB">1048576</fileSize>
<Thread>1</Thread>
<member ordinal="0" memberName="redo03.log" filepath="/u03/oradata/{DB_UNIQUE_NAME}/"/>
</RedoLogGroupAttributes>
</StorageAttributes>
</DatabaseTemplate>
Right after DB creation using DBCA, I would expect to see the following initialization paramaters populated in /oracle/u01/app/oracle/admin/ora10g/pfile/init.ora file that match the values I specified in the template file, but it appears that some initialization parameters are either not populated or incorrectly populated.
db_cache_size=1g
(this parameter entry is missing, not getting popultated at all)
sga_target=1600m
(sga_target populated with 1211105280)
pga_aggregate_target=1g
(pga_aggregate_target populated with 403701760)
shared_pool_size=128m
(this parameter entry is missing, not getting popultated at all)
large_pool_size=0
(this parameter entry is missing, not getting popultated at all)
java_pool_size=0
(this parameter entry is missing, not getting popultated at all)
log_buffer=64000000
(this parameter is correctly populated)
transactions=610
(this parameter is correctly populated)
recyclebin=OFF
(this parameter entry is missing, not getting popultated at all)
cursor_sharing=EXACT
(this parameter is correctly populated)
Does anyone know why some initialization parameters did not get populated or incorrectly populated into init.ora?
Thanks in advance.
Ken

Likely dbca currently uses the spfile to store the parameters, as you should do too.
Apart from that the pfile Oracle uses is located in $ORACLE_HOME/dbs/init<sid>.ora
It is possible this file is soft-linked to the file you mention.
If it isn't the file you mention is not being used at all.
Hth
Sybrand Bakker
Senior Oracle DBA

Database Initialization Parameters Removal list 9iR2

I have seen Oracle Metalink Document: Database Initialization Parameters and Configuration for Oracle Applications Release 11i Doc ID: Note:216205.1
https://metalink.oracle.com/metalink/plsql/f?p=130:14:654135795036791041::::p14_database_id,p14_docid,p14_show_header,p14_show_help,p14_black_frame,p14_font:NOT,216205.1,1,1,1,helvetica#9iR2
This document has a removal list and states that these parameters should be removed from the database initialization parameters file for 9iR2, while I can see some of the parameters being used which are hash_area_size, sort_area_size and optimizer_mode.
Please clarify.
Thank you
Adith

You would need to set "hash_area_size" and "sort_area_size" if you have 8.1.7.X database. For 9i and 10g you do not need to set them, and this is exactly what is mentioned in the note.
If you check "Release-specific database initialization parameters for 9iR2 (9.2.0.X)", you will find the following:
As of 9i, the automatic memory manager is used. This avoids the need to manually tune sort_area_size and hash_area_size

Session parameters / initialization parameters

what are session parameters? What are initialization parameters?
When we do: alter system set....., does need a restart of the machine? of Oracle instance?
thx

Initialization parameters are those defined in your pfile or spfile (init.ora).
Some of these parameters can be redefined at session level:
see http://download-uk.oracle.com/docs/cd/B10501_01/server.920/a96536/ch14.htm#1014104
To get the parameter values, you can for example, run
show parameter <parm>
When we do: alter system set....., does need a restart of the machine? No
of Oracle instance?Yes if the parameter is static, no if the parameter is dynamic.
Message was edited by:
Pierre Forstmann

Question about the Initialization Parameters Information in the Alert.log

Hi, All -
What is the correct answer for the following question.
Specifically, what information does Oracle provide you with in the alert.log regarding initialization parameters?
a. Values of all initialization parameters at startup
b. Values of initialization parameters modified since last startup
c. Values of initialization parameters with non-default values
d. Only values of initialization parameters that cannot be modified dynamically.
I think the answer should be B, but I would like to confirm.

The answer is C
http://download.oracle.com/docs/cd/B19306_01/server.102/b14220/process.htm#sthref1633
The alert log is a special trace file. The alert log of a database is a chronological log of messages and errors, and includes the following items:
All internal errors (ORA-600), block corruption errors (ORA-1578), and deadlock errors (ORA-60) that occur
Administrative operations, such as CREATE, ALTER, and DROP statements and STARTUP, SHUTDOWN, and ARCHIVELOG statements
Messages and errors relating to the functions of shared server and dispatcher processes
Errors occurring during the automatic refresh of a materialized view
The values of all initialization parameters that had nondefault values at the time the database and instance start
Kamran Agayev A. (10g OCP)
http://kamranagayev.wordpress.com

Regarding initialization parameters

Hai all,
Can anybody please help me regarding this initialization parameters like
1.what is correct value (how to find)
2. indetail about each parameter
1._optimizer_mjc_enabled
2.max_dump_file_size
3.optimizer_index_caching
4.optimizer_index_cost_adj
5.parallel_execution_message_size
6.parallel_max_servers
7.parallel_threads_per_cpu
8.processes
9.sessions
10.shared_pool_reserved_size

Following link would be the best place to get the details about all initialization parameters.
http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/statements_2013.htm#i2154767
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Minimum initialization parameters that need to be specified

During Database Creation, will specifying these initialization parameters be enough:
db_name= mydb
control_files = ("C:\ORACLE\PRODUCT\10.2.0\ORADATA\MYDB\CONTROL01.CTL","C:\ORACLE\PRODUCT\10.2.0\ORADATA\MYDB\CONTROL02.CTL","C:\ORACLE\PRODUCT\10.2.0\ORADATA\MYDB\CONTROL03.CTL")
db_block_size=8192
undo_management=AUTO
Also, is there an order in which these need to be specified ?
ramya
Edited by: Ramya Reddy on Feb 26, 2009 8:17 PM

Ramya,
Here is an example of working init.ora file created using default. I am marking all parameter which can be speficied later enclosed between "+"
dss.__db_cache_size=599785472
dss.__java_pool_size=4194304
dss.__large_pool_size=4194304
dss.__shared_pool_size=264241152
+dss.__streams_pool_size=8388608+
+*.audit_file_dest='C:\oracle\product\10.2.0\admin\DSS\adump'+
*.background_dump_dest='C:\oracle\product\10.2.0\admin\DSS\bdump'
*.compatible='10.2.0.3.0'
*.control_files='C:\u01\oradata\DSS\DSS\control01.ctl','C:\u01\oradata\DSS\DSS\control02.ctl','C:\u01\oradata\DSS\DSS\control03.ctl'
*.core_dump_dest='C:\oracle\product\10.2.0\admin\DSS\cdump'
*.db_block_size=16384
*.db_domain=''
*.db_file_multiblock_read_count=16
*.db_name='DSS'
+*.db_recovery_file_dest='C:\oracle\product\10.2.0\flash_recovery_area'+
+*.db_recovery_file_dest_size=16917725184+
*.dispatchers='(PROTOCOL=TCP) (SERVICE=DSSXDB)'
*.job_queue_processes=10
+*.log_archive_dest_1='LOCATION=C:/u01/oradata/ArchiveLogs'+
*.log_archive_format='ARC%S_%R.%T'
*.open_cursors=300
*.pga_aggregate_target=209715200
*.processes=150
*.remote_login_passwordfile='EXCLUSIVE'
*.sga_target=886046720
*.undo_management='AUTO'
*.undo_tablespace='UNDOTBS1'
*.user_dump_dest='C:\oracle\product\10.2.0\admin\DSS\udump'Regards
Edited by: OrionNet on Feb 26, 2009 11:32 PM

"All Initialization Parameters" - Error

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oracle.sysman.emSDK.admObj.AdminObjectException: java.sql.SQLException: ORA-01652: unable to extend temp segment by 128 in tablespace TEMP1
Could you help me fix this?

It's rather imposible...
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TEMP1 10.0 1.0 [Used (%)] [Used (%)] [Used (%)] 10.0 9.0 [Status] 1 TEMPORARY LOCAL MANUAL
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I am working with Tomcat Apache server 6.0
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Please tell me how to do it.
Thanks.

use <init-param> in <servlet> tags
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If you want to get more informations about its setting, google it with "init-param web.xml"
Best regards!

Initialization Parameters for JSPs ??

Hi All,
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Hi Navaneeth ,
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Passing Runtime initialization parameters to a Servlet

Hi all.
Plz.let me know, how do you pass runtime initialization parameters to a Servlet. Also, when do we need this approach. Thank You.

Global parameters that may change should be passed as parameters so that the servlet doesn't have to be recompiled to make the change.
Here a global parameter is used to store a timeOut value. This value is written to every web page to force the page to refresh.
<web-app>
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            <param-value>300</param-value>
        </init-param>
     </servlet>
</webapp>

Access Initialization Parameters using jsp

Hi All,
Now I'm learning JSP . I want to access the initialization parameters using jsp. How to do it. I used the following code , but it shows null
initparameter.jsp
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     <body>
          <h1>
               <%
                    out.println("InitParameter Checking");
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          </h1>
     </body>
</html>I configured the following tags in my web.xml.
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Thanks in advance,
mahes

try overriding the jspInit method and then call getServletConfig() method and call getInitiParameter() on that ..infact the config implicit object would iachieve the same .i don't understand why it's printing null in your case .let me test and see

New Initialization Parameters introduced in Oracle 11G

May I know where can i get list of all new Initialization Parameters introduced in Oracle 11G?
In upgrade document i found deprecated and obolete parameters, but not all new parameters which are introduced in 11G
Thanks
Sarayu

Hi;
I belive below thread will answer your question
evolution of init.ora parameters
evolution of init.ora parameters
Also Please check below notes:
Oracle® Database Upgrade Guide 11g Release 1 (11.1)<< part Adjust the Initialization Parameter File for the New Release
Oracle® Database New Features Guide
http://download.oracle.com/docs/cd/B28359_01/server.111/b28279/chapter1.htm
Regard
Helios

Recommended database initialization parameters databases for OBIEE

Hi ,
We are implementing OBIEE. We created 11gR1 (11.1.0.7) databases - one for datawarehouse and second for ETL repository. Can anyone please suggest the recommended database initialization parameters for the same. I searched metalink and got for EBS (11i/R12) and not for OBIEE.
Also, if you have any best practices documents for OBIEE, please provide the link.
Thanks in advance for your help

You need to look for OBIA (Apps) not OBIEE:
[http://download.oracle.com/docs/cd/E14847_01/bia.796/e14843/anyinstadmpreinstall.htm#g1125320]
- Section 3.1, "General Guidelines for Setting Up Oracle Business Analytics Warehouse"
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- Section 3.3, "IBM DB2 UDB zOS and OS/390 and z/OS-Specific Database Guidelines for Oracle Business Analytics Warehouse"
- Section 3.4, "SQL Server-Specific Database Guidelines for Oracle Business Analytics Warehouse"
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- Section 3.7, "Additional Suggestions for Optimizing Oracle Performance in Oracle Business Analytics Warehouse"
- Section 3.8, "Partitioning Guidelines For Large Fact Tables"
- Section 3.9, "Miscellaneous Information About Oracle BI Applications Deployments"
Cheers,
C.

Which are the initialization parameters that can be replaced by Environmet ariables

If I am connecting to SQL Plus from a command window(cmd), which are the variables that I can set in Environment, so that it overrides the values set in init.ora file.
For eg I can SET the following environment variables using a batch file
SET NLS_DATE_FORMAT=RRRR-MM-DD
SET NLS_LANGUAGE=US.AMERICAN.ISO***
Now when a new SQL session starts this values are set in the new session.
Can I know which other Oracle initialization parameters can be set in a batch file.

http://otn.oracle.com/docs/products/oracle9i/doc_library/release2/nav/initora.htm

Some initialization parameters

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