Oracle RAC /apps best practice

New to RAC and trying to set up the filesystems according to best practice. For the /apps mountpoint (for oracle binaries etc.) we have made it seperate to each server, with the thought that 'rolling' oracle upgrades could be done rather than a shared storage to all servers in the cluster. Unfortunately by having it on the SAN it causes configuration issues when then presenting shared storage for data to the cluster.
Do most (best practice) RAC clusters have local (on board) storage for the /apps oracle binaries rather than SAN presented storage?
Thanks.

Hi Linux-Newbie
I would advice you to control on the best place the IBM rebooks : http://www-111.ibm.com/search/SupportSearchWeb/SupportSearch?action=search&pageCode=SPS&productKey=&clearAll=false&brand=&os=&searchTerms=RAC+best+practice&searchLimits=DA410%2BDA430%2BDA440%2BD600%2BD700%2BDB510%2BDB520%2BD800%2BDB540%2BDB560%2BDB530&searchLimits=DA410%2BDA430%2BDA440%2BDA420%2BDA460%2BDA470%2BDA480%2BDB100%2BDA4A10%2BDA4A20%2BDA4A30%2BDA400%2BDA500%2BDB700%2BDB600&searchLimits=DB550%2BD100&sortBy=1&docCount=0&submit.x=0&submit.y=0&submit=submit
Or
http://www.oracle.com/technology/products/database/clustering/index.html

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Hello experts,
Is there any place I could find oracle PL/SQL best practice programming advice? I got a requirement to write a small paper to help new people that come to work for us so I wanted to put some of best practices (or a set of standard tips) in that along with coding standards etc...
Best regards,
Igor

Hello,
my first links would be
Re: 10 database commandments
On Code Reviews and Standards
Beware: Any discussion about coding standards tends to get lenghty with flame wars about upper/lower/camelcase keywords, indent style etc :-)
As stated in the linked document: keep them simple.
Regards
Marcus
Best Practices
Doing SQL from PL/SQL: Best and Worst Practices
Naming and Coding Standards for SQL and PL/SQL
PL/SQL Coding Standards
Also related:
Performance question
Re: How to re-construct my cursor ?

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Hi expert.
I'll use memory_target in my oracle 11g enviroment. There is a best practices, or formula, for to choose my memory_target?
There is a memory_target limit? (for example 128gb)
Many thanks

Thanks for the replies.
I could like know if there are some criteria, or formula, to a correct memory_target set.
I'm reading the file OracleOLTPonDellEqualLogicPS60x0.pdf
>
http://www.google.com/url?sa=t&source=web&cd=1&ved=0CBQQFjAA&url=http%3A%2F%2Fwww.delltechcenter.com%2Fpage%2FSizing%2Band%2BBest%2BPractices%2Bfor%2BOracle%2B11g%2BOLTP%2Bon%2BEqualLogic&rct=j&q=OracleOLTPonDellEqualLogicPS60x0.pdf&ei=7av3TPP_J4yb4Ab_7pnzBg&usg=AFQjCNF9PfDrIP-VkYq_v3qPx03UAdkF9Q&sig2=pAF4A7E-S_FJkQ8jxsiWmw&cad=rja
>
that explain the best practices for an Oracle RAC 11g on Dell Server. About the Tuning Parameter I don't undestand very well what's the criteria for to choose the MEMORY_TARGET between 32,40 or 48GB
Maybe choose what's the correct memory value for my server? I've an machine with X gb of RAM that I can allocate for an oracle istance. There is a fisical limit MEMORY_TARGET?
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Office Web Apps - Best Practice for App Pool Security Account?

Guys,
I am finalising my testing of Office Web Apps, and ready to move onto deploying it to my live farm.
Generally speaking, I put service applications in their own application pool.
Obviously by doing so this has an overhead on memory and processing, however generally speaking it is best practice from a security perspective when using separate accounts.
I have to create 3 new service applications in order to deploy Office Web Apps, in my test environment these are using the Default SharePoint app pool.
Should I create one application pool for all my office web apps with a fresh service account, or does it make no odds from a security perspective to run them in the default app pool?
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Mobile App Best Practice When Using SQLite Database

Hello,
I have a mobile app that has several views.
Each view calls a different method of a Database custom class that basically returns the array from a synchronous execute call.
So, each view has a creationComplete handler in which I have something like this:
var db:Database=new Database();
var connectResponse:Object=db.connect('path-to-database');
if(connectResponse.allOK)//allOK is true if connection was succesful
//Do stuff with data
else
//Present error notice
However this seems reduntant. Is it OK to do this once (connect the the database) in the Main Application file?
The do something like FlexGlobals.topLevelApplication.db?
And even generally speaking, constants and other things that I would need throughout the app, can be placed in the main app? As a best practice, not technically as technically it is possible.
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no, I only connect it once
I figured I wanted several views to use it so made it static and singleton as I only have 1 database
I actually use synchronous calls but there is a sync with remote mysql database function, hence the eventdispatcher
... although I am thinking it might be better to use Async and dispatch a custom event and have the relative views subscribe

Oracle BPEL standard, best practice and naming convention

Hi, folks,
Is there any standard or best practice associated with Oracle BPEL, regarding development, performace, what to avoid, etc? And is there any naming convention for the process, variable partner link name, etc? Similar to naming convention in writing Java code?
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Hi,
Here is the best practice guide:
http://download.oracle.com/technology/tech/soa/soa_best_practices_1013x_drop3.pdf
Thanks & Regards,
Dharmendra
http://soa-howto.blogspot.com

In Oracle, which is best practice for 'NOT EQUAL TO'

I need to check for where a decimal value is not zero.
Am I better to use
'less than symbol or greater than symbol' 0
or
!= 0or does Oracle substitute 'less than symbol or greater than symbol' to != effectively ?
In my mind if it doesn't the 'less than symbol or greater than symbol' would be slower because it has to check if the value is greater than OR less than.
I appreciate != is not SQL-92 compliant.
I appreciate it would be less than a nano second difference but they all add up!
Thanks
The 'less than symbol or greater than symbol' do not show it seems as they are used in HTML.
Edited by: cubmar on Jun 5, 2009 11:16 AM
Edited by: cubmar on Jun 5, 2009 11:21 AM

Even though The CBO is cleverly written program it does makes its assumptions. When ever the Optimizer finds a NOT operator it assumes that is going to fetch a large portion of the data and goes for a FULL TABLE SCAN. INDEX SCAN Is not an option.
And hence if you are not going to select a large portion of the data using NOT can be expensive.
Below is an example.
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SQL> create table t
2 as
3 select decode(level,1,1,0) no, rpad('*',100,'*') name
4    from dual
5 connect by level <= 100000
6 /
Table created.
SQL> create index t_idx on t(no)
2 /
Index created.
SQL> exec dbms_stats.gather_table_stats(user,'T',cascade=>true)
PL/SQL procedure successfully completed.so when i use the condition no != 0 i am gong to select only 1 record. So i expect the optimizer to go for a INDEX RANGE SCAN but see what happens.
SQL> explain plan
2 for
3 select * from t where no != 0
4 /
Explained.
SQL> select * from table(dbms_xplan.display)
2 /
PLAN_TABLE_OUTPUT
Plan hash value: 1601196873
| Id | Operation         | Name | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT |      |     1 |   103 |   345   (2)| 00:00:05 |
|* 1 | TABLE ACCESS FULL| T    |     1 |   103 |   345   (2)| 00:00:05 |
Predicate Information (identified by operation id):
PLAN_TABLE_OUTPUT
   1 - filter("NO"<>0)
13 rows selected.But with the use of < or > you can go for a INDEX RANGE SCAN.
SQL> explain plan
2 for
3 select * from t where no >0 or no <0
4 /
Explained.
SQL> select * from table(dbms_xplan.display)
2 /
PLAN_TABLE_OUTPUT
Plan hash value: 4259936809
| Id | Operation                    | Name | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT             |       |     2 |   206 |     6   (0)| 00:00:01 |
|   1 | CONCATENATION               |       |       |       |            |          |
|   2 |   TABLE ACCESS BY INDEX ROWID| T     |     1 |   103 |     3   (0)| 00:00:01 |
|* 3 |    INDEX RANGE SCAN          | T_IDX |     1 |       |     2   (0)| 00:00:01 |
|   4 |   TABLE ACCESS BY INDEX ROWID| T     |     1 |   103 |     3   (0)| 00:00:01 |
|* 5 |    INDEX RANGE SCAN          | T_IDX |     1 |       |     2   (0)| 00:00:01 |
PLAN_TABLE_OUTPUT
Predicate Information (identified by operation id):
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   5 - access("NO">0)
       filter(LNNVL("NO"<0))
19 rows selected.So you must be cautious when you use NOT operator.

Best Practice for migration to Exadata2

Hi Guru,
I'm thinking to migrate an Oracle RAC 11g (11.2.0.2) on HP/UX Itanium cluster machine to a New Exadata 2 System
Are there best practice? Where can I found documentation about migration?
Thanks very much
Regards
Gio
Edited by: ggiulian on 18-ago-2011 7.39

There are several docs available on MOS
HP Oracle Exadata Migration Best Practices [ID 760390.1]
Oracle Exadata Best Practices [ID 757552.1]
Oracle Sun Database Machine X2-2/X2-8 Migration Best Practices [ID 1312308.1]
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- Wilson
www.michaelwilsondba.info

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http://www.oracle.com/technetwork/apps-tech/policy-automation/overview/index.html
Jasmine Lee has digested much of her 10 years experience into these fantastically useful new materials - and they're free!
Davin Fifield

Thanks Davin to posted this info!
Thanks Jasmine these material very nice.

Essbase unix file system best practice

Is there such thing in essbase as storing files in different file system to avoid i/o contention? Like for example in Oracle, it is best practice to store index files and data files indifferent location to avoid i/o contention. If everything in essbase server is stored under one file directory structure as it is now, then the unix team is afraid that there may run into performance issue. Can you please share your thought?
Thanks

In an environment with many users (200+) or those with planning apps where users can run large long-running rules I would recommend you separate the application on separate volume groups if possible, each volume group having multiple spindles available.
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Regards,
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Hi,
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http://otn.oracle.com/docs/products/oracle8i/doc_library/817_doc/server.817/a76992/sql.htm
http://otn.oracle.com/tech/pl_sql/content.html
You can search for more in the oracle site for "Best Practices" or "Coding Standards". You can also search in
"www.google.com" for external articles.
Thanks,
Sharmila

Best practice-naming standards

Where can I locate information as to Oracle Inc recommended best practices specifically addressing field, table, schema naming?
Thanks for your response.
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by Steven Feuerstein
Four simple guidelines for improving the quantity and quality of PL/SQL code you write
http://otn.oracle.com/oramag/oracle/03-nov/o63tech_plsql.html
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Hi All,
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Regards,

This is a very broad question - narrowing it to specifics might help folks respond better.
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Oracle Workflow Best Practices Release 12 and Release 11i (Doc ID 453137.1)
As far as functional practices are concerned, these may vary from module to module, as functionality and workflow implementation vary from module to module.
FAQ: Best Practices For Custom Order Entry Workflow Design (Doc ID 402144.1)
HTH
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Thanks - casey

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Oracle RAC /apps best practice

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