Access Multiple Schemas

Greetings,
I've been able to create a report page using sql that maps to my default schema. How does one query data from a table mapped to an additional schema?
Thanks in Advance
Clifford Moon
UTPA WebMaster

Hi,
As a followup, and after reading through some other posts, I found several on creating a DBLINK, which I did from within portal. I get a successful connection when I test it, but when i try the following with HTMLDB:
select * from <tablename>@<dblinkname> i get the following error:
ORA-02019: connection description for remote database not found.
Any suggestions.?
-- cliff

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Accessing Multiple Identical Schemas from Single Form

Hi,
I'm working with oracle 9i.
My question is as follows:
If one has muliple schemas that are all identical, is it possible to setup an oracle form (Oracle Forms 9i) that is able to switch between schemas by selecting the schema from an objecton the form like a drop down list etc..I'm wondering if it is possible to design 1 form that can be used to access all schemas from a single logon. if so, how would I go about doing this? Any help would be greatly appreciated!
I hope my question above is clear. If not I am happy to supply more info.
Kind Regard,
Damian

Your question is not very clear. Of course your logon will determine which schema. If you want to switch schemas, when the form is already running then you can use ALTER SESSION as Aleksandar indicated, but I would not recommend using it unless all form changes were committed. Another alternative is to create another session in the same schema by using OPEN_FORM, then logout of schema in this second session and login into new schema.

Multiple Schemas under one user account with XE 10g

Hi,
I am using (learning) XE 10g. I would like to know if it is possible to have multiple schemas under one user account and have the schemas logically separated. As of right now, I have three schemas that I am working with, each one under a different user account. This is inconvenient, because I have to logout of one user account and login to another user account simply to be able to work with another schema.
Thanks

It isn't possible to have multiple schemas under one database user account. It is of course possible to grant rights to other database users, and or roles, in order to allow access to the tables/data from other accounts. In Oracle there is a one-one mapping between schema and user.
Niall Litchfield
http://www.orawin.info/

How to access multiple database present in single instance

Hi Team,
In oracle 11.2, can there be multiple databases in an instance??? In one of our environment, I could see multiple databases in an instance. Could you please help me in giving the data dictionary or query to access those databases?
Actually, querying v$database, I could see only one database which is same as instance name. But in inventory, there are multiple database in an instance?
I am still not exactly clear about this. Can someone help me with this?
Thanks!
Vidhya

In Oracle one instance manages one (1) database. A database consists of multiple *schemas*.
Other vendors erroneously call a schema 'database'.
So, no, you didn't see multiple databases.
There is also one datadictionary, consisting of a set of views.
All views beginning with dba_ list the entire database, all schemas.
All views beginning with all_ list the objects you have access to.
All views beginning with user_ list your own objects.
The view DICT show you the contents of the datadictionary.
Oracle also has online documentation at http://docs.oracle.com
From your question it is clear you should read the document called the 'Oracle Concepts Manual'.
You can find all documentation for 11gR2 here Oracle Database Online Documentation 11g Release 2 (11.2)
Too many people here don't make any effort to read it. This is probably the reason why you got no response.
Sybrand Bakker
Senior Oracle DBA

One application with Multiple schemas- common application frame work

Hi All,
I am trying setup a common application frame work in apex. Please help me.
How to achieve this.
Creation of one application attached to different schemas at run time. So that my application maintaince is going to be easy instated of creating copies of same application.
More details:
1. I have one application with 100 pages pointing to a schema dev_common in one workspace APP_COMMON. I have 50 schemas with same structure of dev_common schema with different set of data ( because of large amount of data).
So I want to create one application attached to different schemas.
2. And another thing is I have 100 users, the user can work on 1 or multiple schemas ( I mean same application with different schemas attached)
Any help much appreciated.
Thanks,

Thank you for the reply.
>> b) I think you have to give access rights for the dev_common and app_common to all users.
Dev_common schema is a kind of placeholder. I have 50 schemas same as dev_common because of different business requirements but the front end is same for all 50 schemas. How can we create one application used for 50 schemas instead of creating 50 applications and 50 workspaces.
Please help me.

Using Single Datasource to Access Multiple Databases

Hi,
We would like to know the pros and cons of accessing multiple
databases through a single datasource, versus accessing each
database through its own datasource. Our environment includes
multiple web servers w/ the latest version of ColdFusion MX 7,
clustered through a load balancer. Each web server has 800+ dsns
pointing to different SQL databases on the same SQL server. We have
noticed that the ColdFusion administrator is taking a long time to
display or verify all datasources and sometimes it even times out.
Another problem is that sometimes the neo-query file gets corrupted
(for unknown reasons) which results in the deletion of one, or
more, or all datasources on the web server.
Because of the issues above we are researching the
possibility of removing most of the datasources, and then accessing
each database through a single bridge datasource. In that regard we
plan to change our queries by inserting the sql db name and user in
front of each table in the query such as:
<cfquery name="query" datasource="single_dsn_name">
select * from [#dbname#].dbo.tableName
</cfquery>
In the example above, obviously #dbname# would be a variable
that will hold the name of the requested database. The code above
would similarly apply to queries using, update, insert and join
words.
Are there any limitations or negatives from scalability,
performance, and reliability perspective in implementing the above
scenario versus having one datasource for each database.
Also, if there is a better way of accomplishing this, we
would love to hear about it.

Here is my opinion, because I work with both schemas. The
main advantage to use one datasource for all DBs in a SQL Server is
the simplicity of administration.
But the main disadvantage is security, because you are using
a single user to access all DB in a server, you don't have
isolation, and a user that knows your schema can access data of
other DBs that he sould not be authorized.
Another issue is is a user must access 2 differents DB with
different permissions (a DB only read and the other read/write),
you'll have to create another datasource, user, etc for it.
But the decision depends in the enviroment. If you are a
hosting company, I would use 1 datasource for user or DB. If the
servers and DBs are of the same company, I could use one datasource
for each SQL server.
Best regards

Help With Multiple Schemas In Multiple Environments

Dear Oracle Forum:
We have a bit of controversy around the office and I was hoping we could get some expert input to get us on the right track.
For the purposes of this discussion, we have two machines, development and production. Currently, on each machine, we have one database with multiple schemas, say, one for sales data and another for inventory. The sales data has maybe 200 tables and the inventory has another 50. About 12 times a year, once a month, we have a release and move code from dev to prod. The database is accessed by several hundred Pro*C and Pro*Cobol programs for online transaction processing.
The problem comes up when we need to have multiple development environments. If I need to work on something for May that requires the customer address field to be 50 characters and somebody else is working on something for July that requires the customer address field to be 100 characters, we can’t both function in the same schema. We have a method of configuring running programs to attach to a given schema/database. Currently, everything connects to the same place. We were told that we should not have the programs running as the owners of the schemas for some reason so we set up additional users. The SALES schema is accessed with the connect string: SALES_USER/[email protected]. (I don’t know where we got dot world from but that is not the current discussion.)
One of the guys said that we should have 12 copies of the database running, which is kind of painful to think about in my opinion. Oracle is not a lightweight product and there are any number of ancillary processes that would have to be duplicated 12 times.
My recommendation is that we have 12 schemas each for sales and inventory with 12 users each to access them. We would have something like JAN_SALES_USER, FEB_SALES_USER, etc. Each user would have synonyms set up for each of the tables it is interested in. When my program connects as MAY_SALES_USER, I could select from the customer table and I would get my 50 character address field. When the other user connects as JUL_SALES_USER, he would get his 100 character address field. Both of us would not know anything different.
Another idea that came up is to have a logon trigger that would set the current schema for that user to the appropriate base schema. When JUL_SALES_USER logs in, the current schema would be set to JUL_SALES, etc. This would simplify things by allowing us to avoid having something like 2400 synonyms to maintain (which could be automated without too much difficulty) but it would complicate things by requiring a trigger.
There are probably other ways to go about this we have not considered as yet. Any input you can give will be appreciated.
Regards,
/Bob Bryan

Hans Forbrich wrote:
I'd rather see you with 12 schemas than with 12 databases. Unless you have lots of CPUs to spare ... and lots of cash to pay for those extra CPU licenses.
Then again, I'd take it one step further and ask to investigate the base design. There should be little reason to change the schema based on time. Indeed, from what little I know of your app, I'd have to ask whether adding a 'date' column and appropriate views or properly coded SQL statements might simplify things. Interesting. If we were to have one big Customer table with views for each month, how would we handle the case where the May people have to see 50 character address and July have to see a 100 character address field. I guess we could have MAY_ADDRESS VARCHAR2(50) and JULY_ADDRESS VARCHAR2(100) and take care to make sure that people connecting as May can only see the May columns, etc. This is simpler than multiple schemas?
I may have overly simplified things in my effort to get something down that would not require too much explanation. The big thing is that multiple people are doing development and they have to be independent of each other. If we were to drop a column for July, the May people will have trouble compiling if we don’t keep things separate. It is not a case of making the data available. The data in development is something we cook up to allow us to test. The other part is the code we compile now will be released to production one of these times. In production, there is only a need for one database.
We are moving from another database product where multiple databases are effectively different sets of files. We have lots of disk space so multiple databases were no problem. Oracle is such a powerful product; I can’t believe there is not some way to set up something similar.

Database Design - multiple schemas

Hi!
We're currently designing a DB for an AUTHENTICATION SYSTEM where several users from different companies (around 40) will have to be authenticated -- connected to ORACLE. Authentication and faster recovery is important.
Recovery/Backup
An issue raise where what if the schema encountered a problem then of course you have to backup the entire data. So we are considering to use multiple schemas.
One Company = One Schema
So if one schema is down then other schemas will not be affected and faster to recover.
Actualy, we're quite hesistant to use multiple schemas because of maintainability -- Managing different schemas and too much burder for our developers.
Will the idea of having multiple schemas be advantageous to what we want to achieve?
Is this a good design or any other idea to handle this kind of situation?
Can Partitioning do the same?
Thanks a lot

Advantages of multiple schemas:
- each schema is entirely separate
- you can maintain at different times/dates for different companies
- different schemas could be on different databases / servers
Disadvantages
- any 'shared' data may have to be duplicated (but you can always use a shared schema for reference data)
- yes, you have to maintain each schema separately (but that would be by scripts, and at least they'd be well tested!)
The dictionary (SYS tables) will be somewhat larger (40 copies of table, index, pl/sql definitions)
- you'll have 40 identical sets of SQL cached; they all look the same, but relate to different schemas. So you need a bigger SGA.
Can Partitioning do the same?No - partitioning is a solution to a physical problem, not a security problem
Is this a good design or any other idea to handle this kind of situation?I think either way works - it depends on size, number of users, are you using a third tier, etc.
Or, with a single schema, you can use VPD - virtual private database (otherwise known as FGAC - fine grained access control or RLS - row level security).
See eg http://builder.com.com/5100-6388_14-5062064.html and also Ask Tom http://asktom.oracle.com/pls/ask/f?p=4950:8:::::F4950_P8_DISPLAYID:70287097313911 which refers to the documents.
You can also implement a kind of VPD on the cheap by using user defined namespaces and the SYS_CONTEXT function, combined with application logic and clever view definitions.
HTH
Regards Nigel

Multiple schemas

A project here has the following requirement.
Want to use multiple schemas in the same database instance with identical structure. That is, from one login we want to determine the schema name to use at runtime and access it using the same mapping descriptors.
Is this possible with TopLink? Thanks.
Haiwei

Hello James
Thanks for the information. However the setting does not seem to make any difference.
For ex: I was trying to fo the following.
The Serversession is created with a connection pool with the Database user TESTUSER. Then I get a clientSession and set the Tablequalifier on this.
ClientSession clientSession = getServerSession().acquireClientSession();
clientSession.getLogin().setTableQualifier("SCOTT");
unitOfWork = clientSession.acquireUnitOfWork();
Then I expected the SQL statements like
SELECT empname FROM SCOTT.emp;
but it is not happening and the queries are generated with out any qulifier to the table name.
Am I missing any thing? I am using Oracle TopLink - 10g Release 3 (10.1.3.3.0)
Thanks and Regards
Potu

Single schema or multiple schemas

Hello
A few years ago I worked on a greenfield project where we were building a system to serve 20 or so different departments with 1200+ users. The approach the existing DBA had taken was to use a single schema for all objects and for all apps. The big advantage I found with this approach was for development, we could have one database and each developer could develop whatever they wanted in their own schema. Name resolution meant that they could override the main copy of whichever object they were working on just by having it in their schema. Unfortunately the project went nowhere and I left after 3 months so I never got to see what issues were raised with the system in production. So I'm wondering, has anyone else taken this approach and if so what would you say are the main things to be wary of? Especially things that aren't a problem when the objects are distributed between multiple schemas.
Thank you in advance
David

user12065404 wrote:
Hi Ed
Thank you for your reply. I think I need to clarify what I meant a little.
On a number of sites I've been to there have been multiple applications spread out over multiple schemas for the same business unit. To draw on the emp example it would be like having the EMP schema containing the emp table and the DEPT schema containing the dept table, with a single HR application (for a single buisness unit/department) selecting from both. If you scale this up to 000s of tables and 30 odd schemas, it's a bit of a nightmare from the perspective of code location and permissions because each department needs to look across schemas to get all of the data to do their job. Effectively tables and code had become segregated into separate schemas by business "function" and it means that the applicaitons are so intertwined with the different schemas that to have more than one business unit means you either need a completely separate database or you have to look at VPD.
App         SCHEMA      Table
HR          emp         emp
dept        dept
Invoicing   emp         emp
invoicing   inv
contracts   contract
orders      ORDER
Ordering    emp         emp
contracts   contract
orders      ORDER
orders     orderitem
...The advantage I saw with a single schema for all the data for a single business unit is the one you have mentioned - i.e. you can very easily set up a new business unit that is totally separate from the other by having a new schema and point the same version of the same application at it. Or failing that, using VPD. And on top of that, security is simplified - no needing direct grants from one schema to the other and especially not requiring WITH GRANT OPTION in the case of a view that pulls data from various schemas and rights to select from the view have to be grated to a role.
App         SCHEMA      Table
HR          abc_ltd     emp
abc_ltd     dept
Invoicing   abc_ltd     emp
abc_ltd     inv
abc_ltd     contract
abc_ltd     ORDER
Ordering    abc_ltd     emp
abc_ltd     contract
abc_ltd     ORDER
abc_ltd     orderitem
...The other big advantage I saw was from a development and testing perspective. You can have one testing database supporting lots of developers working on lots of different projects against the same core data set and code. The multiple schema setup I described above means that effectively you need to have one testing database per project - which becomes unmanageable when databases start growing to the TB range.
David
Edited by: user12065404 on 26-Mar-2010 08:30
Saw a typo in my first exampleOK, now it is a lot more clear.
What you have here is a problem of some data (employee) being enterprise data, and other data being application data.
I take it your "invoiceing" app is used by the sales side of the business, and "ordering" is used by the purchasing side (my last assignment when I was an apps analyst was the purchasing/inventory control for an auto manufacturer).
With what I know at this point, I'd have an HR schema, an INVOICING schema, and an ORDERING schema. (Well actually, I'd have SALES and PURCHASING, because INVOICEING and ORDERING are going to have to integrate with other stuff in those areas). Even though invoicing and ordering both have a CONTRACT table, I'd think the properties of a contract for one would be different than the other, so the table design itself would be different. How about tables SALES_CONTRACT and PURCHASING_CONTRACT. Same concept for ORDERS, and both sales and purchasing would need header and details .... SALES_ORDER_HEADER, SALES_ORDER_DETAIL, PURCH_ORDER_HEADER, PURCH_ORDER_DETAIL.
These two apps need for employee data should be pulled directly from the HR emp table, with access limited to stored procedures that control what data is exposed. Or from materialized views. Never try to maintain the same data in two places at once. It will never maintain consistency.

HT204053 How do I access multiple iCloud accounts

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I have 10 cubes and 30 bex queries on it and i need to create 3 final crystal reports on these 30 queries.
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Hi,
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Accessing multiple PSD layers in Adobe Photoshop Touch from Creative Cloud is important to me.

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Access Multiple Schemas

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