Pankaj Chandiramani's Blog

How to get mail working with Apex packed with 11g ..

Wed, 23 Jul 2008 03:44:30 -0800

Hi , Recently i installed 11g db on one of my systems ,as it comes with APEX i thought to move my apex app(which were in 10g) to the same .........when i moved my apps , i got everything working but mail .......it gave error :ORA-24247: network access denied by access control list (ACL)

The issue is with ACL as by default, the ability to interact with network services is disabled in Oracle Database 11g. To enable i needed to run a procedure as shown below .

DECLARE
ACL_PATH VARCHAR2(4000);
ACL_ID RAW(16);
BEGIN
-- Look for the ACL currently assigned to '*' and give FLOWS_030000
-- the "connect" privilege if FLOWS_030000 does not have the privilege yet.

SELECT ACL INTO ACL_PATH FROM DBA_NETWORK_ACLS
WHERE HOST = '*' AND LOWER_PORT IS NULL AND UPPER_PORT IS NULL;

-- Before checking the privilege, make sure that the ACL is valid
-- (for example, does not contain stale references to dropped users).
-- If it does, the following exception will be raised:
--
-- ORA-44416: Invalid ACL: Unresolved principal 'FLOWS_030000'
-- ORA-06512: at "XDB.DBMS_XDBZ", line ...
--
SELECT SYS_OP_R2O(extractValue(P.RES, '/Resource/XMLRef')) INTO ACL_ID
FROM XDB.XDB$ACL A, PATH_VIEW P
WHERE extractValue(P.RES, '/Resource/XMLRef') = REF(A) AND
EQUALS_PATH(P.RES, ACL_PATH) = 1;

DBMS_XDBZ.ValidateACL(ACL_ID);
IF DBMS_NETWORK_ACL_ADMIN.CHECK_PRIVILEGE(ACL_PATH, 'FLOWS_030000',
'connect') IS NULL THEN
DBMS_NETWORK_ACL_ADMIN.ADD_PRIVILEGE(ACL_PATH,
'FLOWS_030000', TRUE, 'connect');
END IF;

EXCEPTION
-- When no ACL has been assigned to '*'.
WHEN NO_DATA_FOUND THEN
DBMS_NETWORK_ACL_ADMIN.CREATE_ACL('power_users.xml',
'ACL that lets power users to connect to everywhere',
'FLOWS_030000', TRUE, 'connect');
DBMS_NETWORK_ACL_ADMIN.ASSIGN_ACL('power_users.xml','*');
END;
/
COMMIT;

Finally got it working :)

"Demo It To Oracle" (DITO) - CamStudio Help

Mon, 26 May 2008 03:03:54 -0800

Now you can record & share the issues you are facing to Oracle Support .

https://metalink.oracle.com/metalink/plsql/f?p=130:14:7679480494464650902::::p14_database_id,p14_docid,p14_show_header,p14_show_help,p14_black_frame,p14_font:NOT,11.1,1,1,0,helvetica

Its a nice way to share the error & show the support guys on how that error occurred & faster reproducibility.

upcoming posts

Fri, 23 May 2008 01:37:03 -0800

Been long time since i posted something the reason being have started in new directions ......working with OIM , OID & stuff these days .

So will be writing a post to install/config OIM in next couple of days & will keep on posting regularly on the topic.

Applying CPU Patch on RAC using EM -A White paper

Thu, 28 Feb 2008 05:59:15 -0800

I wrote this paper to describes the process & benefits of applying patches using the EM.
Case : RAC - 3 node 10.2.0.3
Patch : CPU July 2007
Method : Rolling patch , zero downtime , using Deployment procedures in EM.

You can access the paper here on OTN.
or by copying the below url :
http://www.oracle.com/technology/products/oem/pdf/saving%20time%20and%20labor%20on%20oracle%20patching%20with%20em%20provisioning%20pack%20-%20a%20case%20study%20with%20oracle%20internal%20it.pdf

Other interesting white papers on EM are also listed here .

Configure SSO(single sign-on) with Apex

Fri, 31 Aug 2007 06:25:44 -0800

I am loving the experience with Apex , we plan to have couple of new application using APEX , for that i neeed to configure SSO with apex .

It can be done in 3 steps :

Creating partner app
Installing sdk (You need to get sso sdk from midtier)
Configuring apex for sso(You need to login a zip file from here)

For step 1 , you need below :
HOME URL : http: // apex_server_name/pls/apex
Success URL : http: // apex_server_name/pls/apex/wwv_flow_custom_auth_sso.process_success
Log Out URL : http: // apex_server_name/pls/apex/apex

Note : not covering the actual creation process , pls look at "Creating Partner App in AS admin guide"

For Step 2:
First unlock the flows schema according to the apex version you have .
SQL> alter user flows_030100 account unlock; (If your Apex version is 2.0.0.0.0 change acccordingly)

Now you need to copy sso sdk from the midtier , Login to Middle tier $ORACLE_HOME/sso/lib
copy ssosdk902.zip , unzip it . It creates some sql scripts & packages .

Login to db as user flows_030100 & run loadsdk.sql
SQL>@loadsdk.sql (Make sure you are executing under flows_XXXX)

Above will load the sso schema into flows account.

For Step 3:
Now we need to wire sso & apex schema(flows_xx)

SQL> @regapp.sql
It will prompt you for
Enter value for listener_token: HTML_DB:Hostname:7777
Enter value for site_id: enter_value_returned_while_registering_sso
Enter value for site_token: enter_value_returned_while_registering_sso
Enter value for login_url: http: // apex_url_here/pls/orasso/orasso.wwsso_app_admin.ls_login
Enter value for encryption_key: enter_value_returned_while_registering_sso
Enter value for ip_check: N

These above value you will get from Registring as partner app in step 1

Now configure authentication packages under flows_XXX schema
You need to login a zip file from here:
Unzip & get 2 files , execute as below

SQL> @custom_auth_sso.sql
SQL> @custom_auth_sso.plb

Finally you should lock flows_XXXX schema & grant execute permission to public user
SQL> alter user flows_020200 account unlock;
SQL> grant execute on wwv_flow_custom_auth_sso to APEX_PUBLIC_USER;

All set , once you use the authentication schema as sso , you can see the login page .

Installing Apex 3.0.1

Tue, 21 Aug 2007 01:33:48 -0800

I have been using Apex extensively now , have created 3-4 application for production usage & i can finally say that its easy to use for us non developers also ;)

I will be covering the installation of Apex 3.0.1 in this post & will cover the SSO part in next .

Software Req:

Download Apex 3.0.1 from here
10g Db
Http server

In short , the process of Installing & configuring apex goes like this :
Install 10g Db --> Install Http server (i used 10g AS) -->Install Apex

Starting the Apex Installation
I assume you have 10g Db installed , else read this post for details .

You need to create 2 table space , i created apex1 & apex2 to seed the apex data :

create tablespace apex1 datafile '/apexdb/apex1.dbf' size 50M autoextend on next 10M maxsize 300M;

create tablespace apex2 datafile '/apexdb/apex2.dbf' size 50M autoextend on next 10M maxsize 300M;

Now we will seed the db with Apex configs .
Download Apex 3.0.1 from here & unzip it .

This will craete a subdirectory with name apex , cd into it & start sqlplus as sysdba & run apexins.sql as shown below.
cd apex
sqlplus system@tns_alias as sysdba
@apexins.sql {pass} {ts for user} {ts for files} {ts for temp} /i/

Where

pass - Password for Apex Super User
ts for user - Tablespace for User data (Created above)
ts for files - Tablespace for Apex files (Created above)
ts for temp - temporary tablespace (Usually Temp)
i - is the alias for image directory configuration in Application Server (Apache httpd.conf)

According to our config above , i used :

Sqlplus > @apexins.sql welcome apex1 apex2 temp /i/

It Takes ard 1 hr to get the seed data .

After this is complete , we go to the HTTP server location to configure Apex with it . AS we have the Oracle 10g AS installed we go to $ORACLE_HOME/Apache/modplsql/conf directory .

There in dads.conf we add the below lines :

#######
Alias /i/ "/apex/images/" (replace with your image location)

AddType text/xml xbl
AddType text/x-component htc
<Location /pls/apex>
Order deny,allow
PlsqlDocumentPath docs
AllowOverride None
PlsqlDocumentProcedure wwv_flow_file_mgr.process_download
PlsqlDatabaseConnectString host:port:service_name ServiceNameFormat
PlsqlNLSLanguage AMERICAN_AMERICA.AL32UTF8
PlsqlAuthenticationMode Basic
SetHandler pls_handler
PlsqlDocumentTablename wwv_flow_file_objects$
PlsqlDatabaseUsername APEX_PUBLIC_USER
PlsqlDefaultPage apex
PlsqlDatabasePassword apex_public_user_password
Allow from all
</Location>
###################

For above replace according to your server & install locations , we did below :
PlsqlDatabaseConnectString xyz.com:1521:apexdb apexdb

Post Install
After this you need to restart the Appache server as shown below :

dcmctl updateconfig -ct ohs
opmnctl restartproc ias-component=HTTP_Server (Restart HTTP Server to check it)
ou are all set to use the Apex , try http://hostname.domainname:port/pls/apex

I will be writing on how to configure sso in next post

11g , get -set - go !!!!

Fri, 10 Aug 2007 06:55:15 -0800

11g for linux is available for download @OTN from here.
Read all abt the new features for HA , Db Replay etc from http://www.oracle.com/technology/products/database/oracle11g/index.html

11g whitepapers @ OTN

Mon, 23 Jul 2007 07:09:34 -0800

I have seen couple of good technical whitepapers at otn , below is the link to the same .
These cover the complete series for new features , security , HA etc

http://www.oracle.com/technology/products/database/oracle11g/index.html

Backing Up and Recovering Voting Disks

Wed, 11 Jul 2007 02:31:35 -0800

Backing Up and Recovering Voting Disks

What is a voting disk & why its needed ?
The voting disk records node membership information. A node must be
able to access more than half of the voting disks at any time.

For example, if you have seven voting disks configured, then a node must
be able to access at least four of the voting disks at any time. If a
node cannot access the minimum required number of voting disks it is evicted, or removed, from the cluster.

Backing Up Voting Disks

When to backup voting disk ?

After installation
After adding nodes to or deleting nodes from the cluster
After performing voting disk add or delete operations

To make a backup copy of the voting disk, use the Linux dd command. Perform this operation on every voting disk as needed where voting_disk_name is the name of the active voting disk and backup_file_name is the name of the file to which you want to back up the voting disk contents:
dd if=voting_disk_name of=backup_file_name

If your voting disk is stored on a raw device, use the device name in place of voting_disk_name. For example:
dd if=/dev/sdd1 of=/tmp/voting.dmp

Note : When you use the dd command for making backups of the voting disk, the backup can be performed while the Cluster Ready Services (CRS) process is active; you do not need to stop the crsd.bin process before taking a backup of the voting disk.

Recovering Voting Disks

If a voting disk is damaged, and no longer usable by Oracle Clusterware, you can recover the voting disk if you have a backup file.

dd if=backup_file_name of=voting_disk_name

Administring OCR

Tue, 10 Jul 2007 01:52:01 -0800

Administring OCR
We will see how OCR(Oracle cluster Registry) backup & recovery is done .

Backup
Oracle clusterware automatically creastes a OCR backup every 4 hrs & retains the last 3 backups . Actually the CRSD process creates & manages the backup for each full day & a weekly backup at nd of the week .
Default backup Location : $CRS_HOME/cdata/$clustername

Other than the automated backup , you can export the content any time you want to a file .
eg : $ ocrconfig -export emergency_export.ocr

You can see the list of ocrbackup by using :
$ ocrconfig -showbackup

As the backup directory is default , you can change the dir by using below command
$ ocrconfig -backuploc <directory>

Restore
OCR can be restored (if you have a backup ) be below command

NOTE: Should you need to restore, make sure all CRS daemons on all nodes are stopped.

To perform a restore, execute the command:

$ cd CRS_Home/cdata/crscluster
$ ocrconfig -restore week.ocr

If you had exported using the above command & want to resore , then you can use import
IMPORTANT: Importing a backup when CRS daemons are running will only corrupt OCR.

$ ocrconfig -import emergency_export.ocr

If anything is wrong than you can use the OCRDUMP comand to dump all info to a file & check
$ ocrdump OCR_DUMP

Also you can use :

$ ocrcheck 
to check for the stats of OCR

Get Ready for Oracle Database 11g -July 11th 2007

Tue, 19 Jun 2007 02:21:45 -0800

The Countdown Has Begun to July 11, 2007, when 11g DB will be here :)
Its much awaited release as it has some new feature improvements in high availability, performance, scalability, manageability and diagnosability.

http://www.oracle.com/webapps/events/EventsDetail.jsp?p_eventId=66665

Recovery Scenarios Part-2

Mon, 11 Jun 2007 01:42:45 -0800

Part 2 for the recovery scenarios

B) Lost control File or Media Failure:
      (Disk lost with all the files w/o SYSTEM tablespace)

SVRMGRL> shutdown abort;
SVRMGRL> STARTUP NOMOUNT;

RMAN>
run {
allocate channel c1 type disk;
restore controlfile to '/usr1/ora817/test/dbs/control01.ctl';
replicate controlfile from '/usr1/ora817/test/dbs/control01.ctl';
restore database;
sql "alter database mount";
recover database;
sql "alter database open resetlogs";
release channel c1;
}
RMAN> Reset database

(C) Table recovery: (Incomplete recovery)

This
happens when some one drops table by mistake, and by the time he/she
informs the DBA, other people are still working on the database. So the
DBA has to recover the database until time when the table was dropped.
That causes other people to re-work from that point onwards, and hence
it is an "Incomplete recovery"

When something like this happens, try to find out the exact time of accident.

SVRMGRL> shutdown immediate;
SVRMGRL> STARTUP MOUNT;

RMAN>
run {
allocate channel c1 type disk;
set until time "to_date('2004-01-16:13:17:00','YYYY-MM-DD:HH24:MI:SS')";
restore database;
recover database;
sql "alter database open resetlogs";
}
RMAN> Reset database

(D) If both the ACTIVE redolog files are gone:

SVRMGRL> startup nomount;

RMAN>
run {
allocate channel c1 type disk;
set until logseq=7 thread=1;
restore controlfile to '/usr1/ora817/test/dbs/control01.ctl';
replicate controlfile from '/usr1/ora817/test/dbs/control01.ctl';
restore database;
sql "alter database mount";
recover database;
sql "alter database open resetlogs";
release channel c1;
}

If for some reason this attempt fails,

SVRMGRL> alter database mount; (equivalent of startup mount;)
SVRMGRL> alter database drop logfile group 2; (optional)
SVRMGRL> recover database using backup controlfile until cancel;

(Recover to the point till you have good archivelogs, and then Type CANCEL at the prompt)

SVRMGRL> alter database open resetlogs;

RMAN> Reset database

Run the following script to find out the status of backup process:

alter session set NLS_DATE_FORMAT = 'MM/DD/YY (HH:MIAM)';

col start_time format a20 heading "Backup of this|Database started at"
col a format 999.99 heading "% Complete|so far"
col b format a20 heading "Time taken so far|for this backup"

select start_time,round(sofar/totalwork*100,2) a ,
mod(floor((sysdate-start_time)*24),24)||'
Hrs and
'||floor(((mod(round((sysdate-start_time)*24,2),24))-(mod(floor((sysdate-start_time)*24),24)))*60)||'
Mins' as b
from v$session_longops
where substr(opname,1,4)='RMAN'
and (round(sofar/totalwork*100,2))<100
and (round(sofar/totalwork*100,2))>0
and totalwork !=0;
-- -----------------------------------------

Recovery Scenarios Part -1

Fri, 18 May 2007 04:07:10 -0800

I am covering some of the basic recovery recovery scenarios via RMAN in below , this will be a 2 part series :

Part 1:Database open, datafile deleted
Recovery Scenarios:

Note: If the database is opened with resetlogs, it is necessary to register the new incarnation of the database in the Recovery Catalog with the RESET DATABASE command.

(A) Database open, datafile deleted:

(a) Datafile recovery:

Find the datafile # and tablespace name by querying v$datafile table.

RMAN>
run {
allocate channel dev1 type disk;
sql "alter tablespace users offline immediate";
restore datafile 4;
recover datafile 4;
sql "alter tablespace users online";
release channel dev1;
}

(b) Tablespace recovery:

RMAN>
run {
allocate channel dev1 type disk;
sql "alter tablespace users offline immediate";
restore tablespace users;
recover tablespace users;
sql "alter tablespace users online";
release channel dev1;
}
(c) SYSTEM Tablespace recovery:

Note: If it is the system tablespace datafiles to be restored, the database must be closed. It is not possible to offline the system tablespace.
SVRMGRL> shutdown immediate;
SVRMGRL> STARTUP MOUNT;

RMAN>
run {
allocate channel c1 type disk;
restore tablespace SYSTEM;
recover database;
sql "alter database open resetlogs";
release channel c1;
}
RMAN> Reset database;
(This command NOT allowed if you are NOT using Recovery Catalog)

Will post some more .............stay tunned ........

Rman Backup scripts

Fri, 18 May 2007 02:23:32 -0800

Backup a complete database:

(If the target database is in archive mode, this can be done while the database is open)

RMAN>

run {

# backup complete database to disk

allocate channel c1 type disk;

backup full

tag full_db

format '/usr1/ora817/test/rman/db_d.dmp'

(database);

release channel c1;

}

You can create a script and use it multiple times, so each time you
don't need to type the above script. Just make sure to drop the old
backup files.

RMAN>

create script full_db_backup {

allocate channel c1 type disk;

backup full database

format '/usr1/ora817/test/rman/db_%d.dmp';

release channel c1;

}

This is how you run the script:

RMAN>

run { execute script full_backup ;}

Archive logs too can be backed up along with the database in one script:

RMAN>

create script full_db_arc_backup {

allocate channel c1 type disk;

backup full database

format '/usr1/ora817/test/rman/db_%d.dmp';

release channel c1;

allocate channel c2 type disk format '/usr1/ora817/test/rman/arc_%d.dmp';

backup (archivelog all delete input);

release channel c2;

}

- '%d' puts database name in the backup file name.

- 'all delete input' in above script deletes all the archive logs once the backup is

   complete, thus frees up the space.

RMAN>

run { execute script full_db_arc_backup ;}

Simulating ASM Disks

Tue, 15 May 2007 01:53:42 -0800

Most of the Oracle 10g databases are using ASM for storage as its very simple to maintain the storage wrt to Disks , Datafiles etc

You can get most of the ASM details & implementation details from OTN here : http://www.oracle.com/technology/asm/index.html

When i started to learn ASM , the real difficult part was to get a test hardware to play with , i looked are to find ways to simulate the asm env & have documented the procedure as below :

Caution: This
method is for Testing & Learning purposes only.

Simulating Asm by faking hardware

-->Faking Hardware
-->Instaling ASM Lib
-->Configuring the disks
-->Install DB & ASM instance

Faking Hardware:

Step 1) Here we create 4 zero-filed files using the DD comand

As Root run the following commands, this will create 4 files of 2Gb each

mkdir /asmdisk
dd if=/dev/zero of=/asmdisk/disk1 bs=1024k count=2000
dd if=/dev/zero of=/asmdisk/disk2 bs=1024k count=2000
dd if=/dev/zero of=/asmdisk/disk3 bs=1024k count=2000
dd if=/dev/zero of=/asmdisk/disk4 bs=1024k count=2000

Step 2) Use the loopback device to assign these disks

/sbin/losetup /dev/loop1 /asmdisk/disk1
/sbin/losetup /dev/loop2 /asmdisk/disk2
/sbin/losetup /dev/loop3 /asmdisk/disk3
/sbin/losetup /dev/loop4 /asmdisk/disk4

Now we need to configure entries to the file "/etc/rc.local" so that these divices are reinitialised on reboot also.

Add the following entries to the file "/etc/rc.local"
/sbin/losetup /dev/loop1 /asmdisk/disk1
/sbin/losetup /dev/loop2 /asmdisk/disk2
/sbin/losetup /dev/loop3 /asmdisk/disk3
/sbin/losetup /dev/loop4 /asmdisk/disk4
/etc/init.d/oracleasm createdisk ASM1 /dev/loop1
/etc/init.d/oracleasm createdisk ASM2 /dev/loop2
/etc/init.d/oracleasm createdisk ASM3 /dev/loop3
/etc/init.d/oracleasm createdisk ASM4 /dev/loop4

Instaling ASM Lib

ASMLib is a support library for the Automatic Storage Management feature of Oracle Database 10g. ASMLib allows an Oracle Database using ASM more efficient and capable access to the disk groups it is using. ASMlib are provided by Oracle from below link : http://www.oracle.com/technology/tech/linux/asmlib/index.html

Pls download the Lib files accoring to your OS & kernel version.

[root@csstage root]# uname -r
2.4.21-27.EL

It gives 3 rpms for download as per the version , pls install then using below command

[root@csstage asm]# rpm -ivh *.rpm

After this completes we go to next step of configuring the disks.

Configuring the ASM Lib & disks
Now we need to use the ASM Lib , configure it & configure the disks accordingly

[root@csstage root]# /etc/init.d/oracleasm configure

Configuring the Oracle ASM library driver.

This will configure the on-boot properties of the Oracle ASM library
driver. The following questions will determine whether the driver is
loaded on boot and what permissions it will have. The current values
will be shown in brackets ('[]'). Hitting <ENTER> without typing an
answer will keep that current value. Ctrl-C will abort.

Default user to own the driver interface []: oracle
Default group to own the driver interface []: oinstall
Start Oracle ASM library driver on boot (y/n) [n]: y
Fix permissions of Oracle ASM disks on boot (y/n) [y]: y
Writing Oracle ASM library driver configuration:           [ OK ]
Creating /dev/oracleasm mount point:                       [ OK ]
Loading module "oracleasm":                                [ OK ]
Mounting ASMlib driver filesystem:                         [ OK ]
Scanning system for ASM disks:                             [ OK ]

Now as the ASM Lib are configured, we will configure the disks
[root@csstage root]# /etc/init.d/oracleasm createdisk ASM1 /dev/loop1
Marking disk "/dev/loop1" as an ASM disk:                  [ OK ]

[root@csstage root]# /etc/init.d/oracleasm createdisk ASM2 /dev/loop2
Marking disk "/dev/loop2" as an ASM disk:                  [ OK ]

[root@csstage root]# /etc/init.d/oracleasm createdisk ASM3 /dev/loop3
Marking disk "/dev/loop3" as an ASM disk:                  [ OK ]

[root@csstage root]# /etc/init.d/oracleasm createdisk ASM4 /dev/loop4
Marking disk "/dev/loop4" as an ASM disk:                  [ OK ]

So now our hardware is all set to go & we need to install 10g database on the server using the above disks.

Install DB & ASM instance

Now we install the Database with ASM option
Create the ASM Instance
ASM runs as a separate Oracle instance, which can be created and configured using OUI. Now that ASMLib is installed and the disks are marked for use, you can create an ASM instance.
Log in as oracle and start runInstaller:
$ ./runInstaller
1.    Select Installation Method

Select Advanced Installation
Click on Next

2. Specify Inventory Directory and Credentials

Inventory Directory: /u01/app/oracle/oraInventory
Operating System group name: oinstall
Click on Next

3. Select Installation Type

Select Enterprise Edition
Click on Next

4. Specify Home Details

Name: Ora10gAsm
Path: /u01/app/oracle/product/10.2.0/asm

Note:Oracle recommends using a different ORACLE_HOME for ASM than the ORACLE_HOME used for the database for ease of administration.

Click on Next

5. Product-specific Prerequisite Checks
If you've been following the steps in this guide, all the checks should pass without difficulty. If one or more checks fail, correct the problem before proceeding.

Click on Next

6. Select Configuration Option

Select Configure Automatic Storage Management (ASM)
Enter the ASM SYS password and confirm
Click on Next

7. Configure Automatic Storage Management

Disk Group Name: DATA
Redundancy

- High mirrors data twice.
- Normal mirrors data once. This is the default.
- External does not mirror data within ASM. This is typically used if an external RAID array is providing redundancy.

Add Disks

The disks you configured for use with ASMLib are listed as Candidate Disks. Select each disk you wish to include in the disk group.

Click on Next

8. Summary

A summary of the products being installed is presented.

Click on Install.

9. Execute Configuration Scripts

At the end of the installation, a pop up window will appear indicating scripts that need to be run as root. Login as root and run the indicated scripts.

Click on OK when finished.

10. Configuration Assistants

The Oracle Net, Oracle Database, and iSQL*Plus configuration assistants will run automatically

11. End of Installation

Make note of the URLs presented in the summary, and click on Exit when ready.

12.    Congratulations! Your new Oracle ASM Instance is up and ready for use.

Create the Database
Once the ASM instance has been created, create a database that uses ASM for storage:
Log in as oracle and start runInstaller:
$ ./runInstaller
1.    Select Installation Method
o    Select Advanced Installation
o    Click on Next
2.    Select Installation Type
o    Select Enterprise Edition
o    Click on Next
3.    Specify Home Details
o    Name:   OraDb10g
o    Path:      /u01/app/oracle/product/10.2.0/db
Note:Oracle recommends using a different ORACLE_HOME for the database than the ORACLE_HOME used for ASM.
o    Click on Next
4.    Product-specific Prerequisite Checks
o    If you've been following the steps in this guide, all the checks should pass without difficulty. If one or more checks fail, correct the problem before proceeding.
o    Click on Next
5.    Select Configuration Option
o    Select Create a Database
o    Click on Next
6.    Select Database Configuration
o    Select General Purpose
o    Click on Next
7.    Specify Database Configuration Options
o    Database Naming: Enter the Global Database Name and SID
o    Database Character Set: Accept the default
o    Database Examples: Select Create database with sample schemas
o    Click on Next
8.    Select Database Management Option
o    Select Use Database Control for Database Management
o    Click on Next
9.    Specify Database Storage Option
o    Select Automatic Storage Management (ASM)
o    Click on Next
10.    Specify Backup and Recovery Options
o    Select Do not enable Automated backups
o    Click on Next
11.    Select ASM Disk Group
o    Select the DATA disk group created in the previous section
o    Click on Next
12.    Specify Database Schema Passwords
o    Select Use the same password for all the accounts
o    Enter the password and confirm
o    Click on Next
13.    Summary
o    A summary of the products being installed is presented.
o    Click on Install.
14.    Configuration Assistants
o    The Oracle Net, Oracle Database, and iSQL*Plus configuration assistants will run automatically
15.    Execute Configuration Scripts
o    At the end of the installation, a pop up window will appear indicating scripts that need to be run as root. Login as root and run the indicated scripts.
o    Click on OK when finished.
16.    End of Installation
o    Make note of the URLs presented in the summary, and click on Exit when ready.
17.    Congratulations! Your new Oracle Database is up and ready for use.

Note : In between the installation , You might be asked to start CSS Deamon , if you havent already done
To start the CSS daemon and configure the host to always start the daemon upon reboot, do the following:

   1.      Log in to the host as root.
   2.      Ensure that $ORACLE_HOME/bin is in your PATH environment variable.
3.    Enter the following command: localconfig add

Start the ASM instance:
$ export ORACLE_SID=+ASM
$ sqlplus "/ as sysdba"

SQL*Plus: Release 10.2.0.1.0 - Production on Sun Sep 3 00:28:09 2006
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Connected to an idle instance.
SQL> startup
ASM instance started
Total System Global Area   83886080 bytes
Fixed Size                  1217836 bytes
Variable Size              57502420 bytes
ASM Cache                  25165824 bytes
ASM diskgroups mounted

SQL> select group_number,disk_number,name,state,mode_status,mount_status,total_mb, from v$asm_disk;

G# D# NAME STATE    MODE_ST MOUNT_S   TOTAL_MB
---- ---------- ----------
1 0 ASM1 NORMAL   ONLINE CACHED        2000
1 1 ASM2 NORMAL   ONLINE CACHED        2000
1 2 ASM3 NORMAL   ONLINE CACHED        2000
1 3 ASM4 NORMAL   ONLINE CACHED        2000
1 4 ASM5 NORMAL   ONLINE CACHED        2000
2 0 ASM6 NORMAL   ONLINE CACHED        2000
2 1 ASM7 NORMAL   ONLINE CACHED        1000

You can get most of the ASM details & implementation details from OTN here : http://www.oracle.com/technology/asm/index.html