Database/Instance VS Schema

Want to use Oracle DB as the database for virtue hosting for mutiple web applications.
Option One: Create one database (or Instance) with multiple shema(s), with each Schema for a web application to access.
Option Two: Each web application has its own database (or Instance)
The Database will be located in the same machine. In general which option is more feasible in terms of maintenance and speed?
Thanks.
Scott
It appears to me the second option is better, but the memory may become an issue, for so many database instance will be loaded to the RAM. The first option may save some memory. But each shema will be hit by many users (such as hundreds). I wonder if use of the schema is feasible.

In case of downtime of database all your web application are having downtime and each application are on different database in that case only respective application would be down. so, it would be better to keep each webapplication on different database as per the maintenance perspective.
If you are expecting hit from "hundreds" users then better invest more memory. at least 500 mb to 1GB SGA per DB.

Similar Messages

Difference between Database, instance and schema

Hi
I don't know the clear difference between database, instance and schema.. In the broad sense, everything seems to be the same. If anyone can differentiate between them with some example, that will be of great help.
Thank you.

Hi,
In Oracle, people often do use "database" and "instance" interchangeably, or together as one term: "database instance".
A "schema" is quite different. A schema is a collection of objects (such as tables, indexes or procedures). Every object belongs to exactly one schema, and every schema is a part of exactly one database. (Names may not be unique, however. For example, your database may have one schema named SCOTT, and another schema named USER1. Each of those schemas may have a table named EMP. The EMP table in the SCOTT schema, or SCOTT.EMP, is not the same as the EMP table in the USER1 schema, or USER1.EMP. A different database, my database for example, may also have schemas called SCOTT and USER1, which are completely independent of the SCOTT and USER1 in your database.)

Need to get data from multiple database instances in a single query

Hi,
I need a small favour from you guys. The prob is as follows:
I need to get name, row_id from table A from schema 1 and gbu_name, name from table B from schema 2 where a.name = b.name. I wrote the query in the following manner:
SELECT a.name, a.row_id, b.gbu_name
FROM Schema1.A as a, Schema2.B as b
Where a.name = b.name
But this query is not working and the error is like " The table does not exists".
Please update me how to avoid the error and get the right sort of result.
Thanks & Regards,
Debabrata

Ah, youre actually asking different things.
In your topic title, you say youre running separate instances
In your body text, you say you are under different user/schema
So tell me, do you have more than one database or not? How many entries in your TNS file?
I would say, for "multiple database instances"
SELECT
a.id, b.id
FROM
tableA a
INNER JOIN
tableB@OTHER_DATABASE_LINK_NAME b <--NOTE!
USING(id)And of course you will have to look up CREATE PUBLIC DATABASE LINK sql..
Message was edited by:
charred

Oracle 9i Upgrade to 10g - Single Database instances to RAC

Hi,
We are considering migrating from single SAP database architecture into
an Oracle 10g RAC architecture. The question i have is:
Are multiple PHYSICAL databases supported in one Oracle 10g RAC environment? For example, Is it possible to install and operate multiple databases in one single ORACLE 10g Real Application Cluster such as one SAP R/3 database, one SAP EBP and one
SAP BW database co-exist in a single Oracle RAC environment?
Regards,
Chengappa Ballachanda

Hi Sairam,
Due to the size of our Production environments we have decided not to pursue the MCOD option.
Eg: Take a QA environment which consists of SRM and BW and we have multiple nodes with both installed on each node. Now if I were to go the MCOD option then these instances can connect to one large Oracle File System using different schema's.
What I'm trying to establish is in that one RAC, is it possible to have the multiple database instances on each node (SRM, BW etc) connect to multiple Oracle File Systems ie SRM connect to its own OFS and BW to its own instead of the one large shared OFS?
Hope this makes sense! Easier if I could upload a diagram!
Regards,
Chengappa

Installation of Database instance on server where database is already exist

Hi All,
We have a separate oracle database team who have copied one of the database using oracel backup restore procedure. This database is in 10g and it is working fine from oracle perspective.
Now as a basis admin i need to install database instance using the existing database. I should not overwrite this existing database but i should attach this existing database while installation of database instace.
I have done normal installation using sapinst and installation export but not done this type of installation as yet.
I am not aware about which option of sapinst i should use for installation of database instance so that it can use the existing database without overwriting it OR if i go with normal way will it able to catch the existing database and give me the option to attah it instead of overwriting it?
Request you all to let me know how to go about it.
Thanks & Regards

All, Thanks for replying
Please find below answer to some of your quries.
1) Yes, This is ABAP only installation.
2) The database is oracle and the file systems on database server are as per SAP standard.
So as per Sunny,
Only way forward is to install the database instance using system copy method of back restore.
I have a mail from my senior, saying
"Normally, sapinst should sense database, SAPERP schema owner and you should be all set.
If that does not happen, as soon as sapinst pauses - so you may continue with Oracle Universal Installer in a different window
,you should STOP (abandon) the Database Instance install phase."
Here is the query.
1) "you should STOP (abandon) the Database Instance install phase."
I am not sure how to stop OR abandon the database instnace install phase. Do anyone knows this?
Thanks fore your reply
Regards

Should i need a new oracle instance or schema?

Hello All,
I know that this is may sound like a silly question but i really need to know. In our company we have a server with oracle standard and a instance that holds a financial database. Now, the company bought a new antivirus software and it runs over oracle database. Now, should i create a new schema to own my antivirus tables or should i need create a new database instance?
I've worked with other database product that has a different concept from oracle, regarding Intance-Database concept. I'm really new from oracle.
Best regards,
Rafael Melo - Br

>
Now, the company bought a new antivirus software and it runs over oracle database
>
What exactly does 'it runs over oracle database' mean?
You need to read the software documentation to see how to use it.
>
Now, should i create a new schema to own my antivirus tables or should i need create a new database instance?
I've worked with other database product that has a different concept from oracle, regarding Intance-Database concept. I'm really new from oracle.
>
An 'instance' and a 'database' are two different, though possibly related, things.
See the Database Concepts Doc for the definition of 'instance' and 'database'
http://docs.oracle.com/cd/E11882_01/server.112/e10713/startup.htm
>
Introduction to the Oracle Database Instance
A database instance is a set of memory structures that manage database files. A database is a set of physical files on disk created by the CREATE DATABASE statement. The instance manages its associated data and serves the users of the database.
Every running Oracle database is associated with at least one Oracle database instance. Because an instance exists in memory and a database exists on disk, an instance can exist without a database and a database can exist without an instance.

How to know database name and schema name by providing package name?

Hi,
Could someonw will help me to get database name and schema name by providing package name ?
I have used the query : select * from all_objects where object_name='Package_name'; but it simply returns schema name where as i need DB name and username.
--Prajakta

but it simply returns schema name where as i need DB name and username.
i want to retrive the DB name for package name
Based on your questions, I wonder if you are used to working in SQL Server? (The server, database, and schema are part of the 4-part name of an object, independent of any user.)
In SQL Server, schema and username are two separate physical concepts. "Schema" is purely logical in Oracle: a user which owns objects is often called a "schema".
In Oracle, "database" is roughly equivalent to the SQL Server concept "server" (what you log in to). It is not part of the naming path to a specific object (unless there is a database link involved, but there is no indication that's what you have here). In Oracle you connect to an Instance (or Service) and people often call this the "database", but there is a fine semantic distinction there (separate topic).
Once connected in Oracle, you fully-qualify an object by only a 2-part owner and object name (possibly 3-part if a database link is involved user.object@link).
12c added another wrinkle to all of this, but I'll assume this question was more basic than that, because you likely would have mentioned if this was a 12c question.

Database instance for XI

Why does XI need separate database instance. Can I use a existing database to write its schema and data and just make oracle client from XI host to talk to the oracle database. Because I don't need another database to make the XI box bigger. I want to use the existing one where I already have my other schema for enterprise application
Thanks

Hi,
XI is a UNICODE install and SAP does not recommend to use the XI box for any other installs or installing the XI into another Oracle instance. If you DB is already UNICODE it might work as MCOD what I have not seen it so far.
Further the XI is a resource hungry hence I would not put the burden from integration work on online users.
Cheers
Stefan

Multiple oracle database instances with different characterset on the same server

Hello,
Is it possible to have 2 database instances running with different charactersets,one with AL32UTF8 and the other with WE8MSWIN1252.?
Are there any setup requirements to be performed prior to setting up the database instances?
The 3rd party utility that we want to use does not support AL32UTF8 and insists on using a database with character set WE8MSWIN1252.
Kindly help.
Thanks,
Ram.

Hello Zhe,
I guess I posted my question in a wrong forum. I tried my best to find a suitable forum and thought this was the best and closest I found. Apparently not. Can you please let me know the right forum for my question?
The below is the breif of what we are currently facing:
We are in the process of finalizing plans to install Automic for our Retail applications to schedule jobs. In the process came to know that Automic does not support AL32UTF8.
Right now we have RMS and UC4 (now called Automic) run on the database server as UC4 supports AL32UTF8 and schema for UC4 is inside the RMS database.
Going forward it is recommended to have a separate database instance on the same server as that of RMS database and with a different characterset which is WE8MSWIN1252.
Please let me know what forum to post in, I will repost the question.
Thanks,
Ram.

Why should be install CI before Database Instance

Hi friends,
<b>Why should be install Central Instance before Database Instance??</b>

Hi
At first, Database Instance Installation doesnot mean that we are installing the database software. Aa we know that Database software must be installed first before starting SAP installations.
In SAP Database instance installation, the required Database schema is created for the SAP Central Instance we have installed first and all the configurations between SAP and Database are done at this process.
If we try to intall the DB Instance before CI then it would give error because for DB CI is prerequisite.
Technically, whole of the file system have to be configured before schema creation from which SAP would fetch the data and informations.
Hope this would help you in clarifying some doubts.
Thanks

What is Database instance

Hi
i just clarified my doubt in central instance !!1
Can any one tell what is database instance ?
Regards
sanjeev

Hi
The database instance is a mandatory instance for the installation of an SAP system. The SAP system usage types AS ABAP and AS Java use their own database schema in the same database.It contains all the database related services.
You have a database now sap instance creates a schema on that database and uses this schema for its operations.
Also visit :http://service.sap.com/instguides
Reward points if useful

Instance versus Schema

Could you describe the difference between an Instance and a Schema? Also, if you require to bring into a single instance two different applications (with same database structure), what will be the advantages/disadvantages that you foresee? The applications may share more than one table/views, thanks

An instance is a collection of inter-related memory structures necessary to have your database behave like a database. In our case we have three whose SIDs (aka 'names') are DEV, TEST & PROD.
A schema is a user account which owns database objects, and a couple can be installed into Oracle by default when an instance is created, namely HR & SCOTT. An instance can have one or more SCHEMAS contained within it (think..table resides in a schema, and the schema resides in the database instance).
We chose to collect all of our applications into a single instance (though we have the three iterations of it DEV, TEST & PROD), separating each application into it's own schema. This would also be fine in your case, as objects can share the same name as long as they're in different schemas.
One instance will greatly simplify your backup strategy, and will also (IMO) allow you to better use hardware resources on your server (assuming you would've put separate instances on the same box).
-Chuck

MCOD installation fails during Database instance phase "CREATE TABLESPACES

We are installing solution manager 3.2 using MCOD option on windows 2003/oracle. Installation fails during Database instance phase "CREATE TABLESPACES" step without any error. Interesting thing is no error message in installation log or oracle alert log.
Installation Details
First instance: SMD / Instance number: 00 / schema: sapsmd / Database SID: SMD
Second instance; SMQ / Instance number: 01 / schema: sapsmq / Database SID: SMD
Did any one come across this issue? Any help is greatly appreciated.
Thanks

Hi,
Did u checked for the Space utilization on the drives.Normally when installation fails there will be some intimation of the cause in the log files written in the sapinst directory.IF it is failing in the tablespace creation phase the that means that the data files cannot be created.
It depends on the database you use: Data files(Oracle), Containers (DB2).
Do check in the sapdata directories whethere the data file have created.
If its not giving you any error then the installation might got stuck bcoz of some memory problems during the "create tablespace phase"
Regards
Ashly.

10g Enterprise Manager is not able to connect to the database instance

I am running a Oracle 10g database in Solaris 10 server. When i am trying to connect to the enterprise manager it says Enterprise Manager is not able to connect to the database instance.
The database instance is open,the listener is up and the agent connection also says that it succeeded.
The server houses two 10g databases and the EM was working properly till yesterday. Kindly Help.
Thanks in advance.
Ram

Hi,
The EM is started and if i give emctl status dbconsole
-bash-3.00$ emctl status dbconsole
Oracle Enterprise Manager 10g Database Control Release 10.2.0.3.0
Copyright (c) 1996, 2006 Oracle Corporation. All rights reserved.
http://gladiator:1158/em/console/aboutApplication
Oracle Enterprise Manager 10g is running
Logs are generated in directory /db8/ora10gr2/product/10.2.0/Db_4/gladiator_TROY/sysman/log
it says that the EM is running. But when i am trying to access the URL it is in IE it says Page cannot be displayed what could be the problem for this???
Thanks in advance.
Ram

RFC Connection Error during Web AS ABAP Database Instance

I keep getting RFC Connection error installing the database instance. The following are the pertinent logs:
INFO 2007-05-09 20:10:04
Working directory changed to C:\Program Files\sapinst_instdir\NW04\SYSTEM\ABAP\MSS\UC\DB.
INFO 2007-05-09 20:10:04
Output of C:\usr\sap\X22\SYS\exe\run\r3trans.exe -u 1 -i "C:\Program Files\sapinst_instdir\NW04\SYSTEM\ABAP\MSS\UC\DB\mssprocs640.dat" is written to the logfile r3trans.exe.log.
INFO 2007-05-09 20:10:22
Execution of the command "C:\usr\sap\X22\SYS\exe\run\r3trans.exe -u 1 -i "C:\Program Files\sapinst_instdir\NW04\SYSTEM\ABAP\MSS\UC\DB\mssprocs640.dat"" finished with return code 0. Output: This is C:\usr\sap\X22\SYS\exe\run\r3trans.exe version 6.13 (release 640 - 03.06.05 - 17:04:00).unicode enabled versionC:\usr\sap\X22\SYS\exe\run\r3trans.exe finished (0000).
INFO 2007-05-09 20:12:23
RFC parameter CLIENT set to value 000.
INFO 2007-05-09 20:12:23
RFC parameter USER set to value DDIC.
INFO 2007-05-09 20:12:23
RFC parameter LCHECK set to value 1.
INFO 2007-05-09 20:12:23
RFC parameter PCS set to value 1.
INFO 2007-05-09 20:12:23
RFC parameter LANG set to value EN.
INFO 2007-05-09 20:12:23
RFC parameter ASHOST set to value cix22.
INFO 2007-05-09 20:12:23
RFC parameter SYSNR set to value 00.
INFO 2007-05-09 20:12:23
RFC connection information checked successfully.
ERROR 2007-05-09 20:12:24
FRF-00007 Unable to open RFC connection.
I tried the following fixes spread across different threads in this Expert Forums:
1. Someone said network problem. I rebooted, restarted the install and even redo it.
2. Another suggestion was to use caps on the password. Didnt work.
3. One suggestion was to update the keydb.xml file. However, I could find such property name:
search for the table t_SAPComponent_SAPSystemLogon_SHARED
then look for <fld name="pPW">, <properties>,
<property name ="GUIENG_USER_INPUT" and set the value
"GUINEG_TRUE" to "GUIENG_FALSE".
4. I even used the ddic password 19920706 which is supposed to be the default.
5. Restarted the instance and applied all the fixes above.
Does anyone know what is going on base on the logs above? Thanks.

try moving all your install disk onto local file system then rerun the install. That might work....

Database/Instance VS Schema

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