Exp for multiple schemas

Hi.
I need to run an export job and wanted to confirm that my command is valid in terms of having mulitple schemas under the OWNER.
exp me_dba/password file=exp_pipe owner=user_a, user_b, user_c, user_d, user_e grants=y rows=y indexes=y buffer=1048576 log=prod1220_log.out
Thanks,

I need to run an export job and wanted to confirm that my command is valid in >terms of having mulitple schemas under the OWNERit's valid,
exp me_dba/password file=exp_pipe owner=user_a, user_b, user_c, user_d, user_e grants=y rows=y indexes=y buffer=1048576 log=prod1220_log.out
this will export the schemas that specified under owner.

Similar Messages

Oracle Streams setup for multiple schemas in a same database

We are on 11.1.0.7 and will be using Oracle 11g Streams that will replicate the data real-time for two schemas between the source and target set of schemas with in the same database. We will be doing DDL as well as DML replication.
I created the following plan and want your inputs. After implementing this, I created a table in SCOTT but it's get replicated to RPT_SCOTT later I tried inserting a row in the table created under SCOTT but that too didn't get replicated to RPT_SCOTT.
Here are the steps that I used to set up my STREAMS -
Database Instance:     TESTDB
Schemas:
     Source:          SCOTT
               HR
     Target:          RPT_SCOTT
               RPT_HR
Configuring Streams:
1.     Database is in Archive log mode
2.     Set up the Streams administrator.
create user STRMADMIN identified by STRMADMIN default tablespace USERS temporary tablespace temp;
grant resource, dba, AQ_ADMINISTRATOR_ROLE to STRMADMIN;
BEGIN
DBMS_STREAMS_AUTH.GRANT_ADMIN_PRIVILEGE(
grantee => 'STRMADMIN',
grant_privileges => TRUE);
END;
3.     Set up Streams queues
CONNECT STRMADMIN/****
BEGIN
DBMS_STREAMS_ADM.SET_UP_QUEUE(
queue_name => 'STREAMS_QUEUE',
queue_table => 'STREAMS_QUETAB',
queue_user => 'STRMADMIN');
END;
4.     Add the Apply rule
BEGIN
DBMS_STREAMS_ADM.ADD_SCHEMA_RULES(
schema_name      => 'RPT_SCOTT',
streams_type     => 'APPLY',
streams_name     => 'APPLY_CC_STREAM',
queue_name          => 'STRMADMIN.STREAMS_QUEUE',
include_dml     => true,
include_ddl     => true,
inclusion_rule     => true,
source_database     => 'TESTDB');
END;
BEGIN
DBMS_STREAMS_ADM.ADD_SCHEMA_RULES(
schema_name      => 'RPT_HR',
streams_type     => 'APPLY',
streams_name     => 'APPLY_AB_STREAM',
queue_name          => 'STRMADMIN.STREAMS_QUEUE',
include_dml     => true,
include_ddl     => true,
inclusion_rule     => true,
source_database     => 'TESTDB');
END;
BEGIN
DBMS_APPLY_ADM.ALTER_APPLY(
apply_name     => 'APPLY_CC_STREAM',
apply_user     => 'STRMADMIN');
END;
BEGIN
DBMS_APPLY_ADM.ALTER_APPLY(
apply_name     => 'APPLY_AB_STREAM',
apply_user     => 'STRMADMIN');
END;
5.     Add the Capture Rule
CONNECT STRMADMIN/*****
BEGIN
DBMS_STREAMS_ADM.ADD_SCHEMA_RULES(
schema_name     => 'SCOTT',
streams_type     => 'CAPTURE',
streams_name     => 'CAPTURE_CC_STREAM',
queue_name          => 'STRMADMIN.STREAMS_QUEUE',
include_dml     => true,
include_ddl     => true,
inclusion_rule     => true,
source_database     => 'TESTDB');
END;
BEGIN
DBMS_STREAMS_ADM.ADD_SCHEMA_RULES(
schema_name     => 'HR',
streams_type     => 'CAPTURE',
streams_name     => 'CAPTURE_AB_STREAM',
queue_name          => 'STRMADMIN.STREAMS_QUEUE',
include_dml     => true,
include_ddl     => true,
inclusion_rule     => true,
source_database     => 'TESTDB');
END;
6.     Set the instantiation system change number (SCN)
CONNECT STRMADMIN/******
DECLARE
source_scn NUMBER;
BEGIN
source_scn := DBMS_FLASHBACK.GET_SYSTEM_CHANGE_NUMBER();
DBMS_APPLY_ADM.SET_SCHEMA_INSTANTIATION_SCN (
source_schema_name => 'SCOTT',
source_database_name => 'TESTDB',
instantiation_scn => source_scn);
END;
7.     Start the Apply
CONNECT STRMADMIN/******
BEGIN
DBMS_APPLY_ADM.START_APPLY('APPLY_CC_STREAM');
END;
BEGIN
DBMS_APPLY_ADM.START_APPLY('APPLY_AB_STREAM');
END;
8.     Start the Capture
CONNECT STRMADMIN/******
BEGIN
DBMS_CAPTURE_ADM.START_CAPTURE('CAPTURE_CC_STREAM');
END;
BEGIN
DBMS_CAPTURE_ADM.START_CAPTURE('CAPTURE_AB_STREAM');
END;
Waiting for your inputs!

If I understand from your code, you want to do this on the same DB :
SCOTT --> RPT_SCOTT
HR --> RPT_HRSo there is a schema transformation, where is it coded ?
General info : http://download.oracle.com/docs/cd/B28359_01/server.111/b28321/strms_transform.htm
More specific on schema rename : http://download.oracle.com/docs/cd/B28359_01/server.111/b28321/strms_mtransform.htm#CHDGDHDE
Next : where are the initialisation of both capture schema ?
Missing :
execute DBMS_CAPTURE_ADM.PREPARE_SCHEMA_INSTANTIATION( schema_name          => 'scott'');
execute DBMS_CAPTURE_ADM.PREPARE_SCHEMA_INSTANTIATION( schema_name          => 'HR'');This tell Streams from where to capture the SCN.
Also there is an (WRONG) instantiation of SCOTT for the apply, which tells the apply to consider as valuable candidate all LCR after source_scn,
but where is the code or RPT_HR. Alas, you put for the APPLY target schema 'SCOTT' while it should have been 'RPT_SCOTT'.
the fact that is correct or false depends where you put the schema transformation. If you put the transformation at apply time then use the SOURCE schema name (SCOTT, HR) for the LCR will contains their name. If you put the transformation at capture time, then put target schema name for the LCR will contain their name (RPT_HR,RPT_SCOTT).
Let's say you put the schema transformation at capture time then
Missing:
DBMS_APPLY_ADM.SET_SCHEMA_INSTANTIATION_SCN (
source_schema_name => 'RPT_HR',
source_database_name => 'TESTDB',
instantiation_scn => source_scn);If you attache the transformation on the apply process then the code is :
DBMS_APPLY_ADM.SET_SCHEMA_INSTANTIATION_SCN (
source_schema_name => 'HR',
source_database_name => 'TESTDB',
instantiation_scn => source_scn);And this is useless:
-- useless code
BEGIN
DBMS_APPLY_ADM.ALTER_APPLY(
apply_name => 'APPLY_CC_STREAM',
apply_user => 'STRMADMIN');
END;
BEGIN
DBMS_APPLY_ADM.ALTER_APPLY(
apply_name => 'APPLY_AB_STREAM',
apply_user => 'STRMADMIN');
END;
/Last : You are using the same queue for 2 separated capture/apply transformation.
Do yourself a favor and give each couple capture/tranform/apply its own queue.

Script to Analyze multiple schemas at same time

Hi Guys,
I'm looking for a script by which I can analyze (estimate 25%) multiple schemas (In Oracle 9i Database) at same time. I know we can use dbms_utility but do not know, how to use for multiple schemas (around 60 schemas). I appreciate your cooperation.
Thanks in advance.
Regards,
Sanjeev

Hi Syed,
Thanks for response,
can u tell me how I can analyze multiple schema by using dbms_stats at same time. I would appriciate if you can send any script for me for same.
Thanks,
Sanjeev
[email protected]

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.

User Datastore for multiple tables and columns!

Hi,
I hop so much, someone can help me.
I've made a user datastore to index multiple columns of multiple tables.
Now, the Documentation of Oracle explains the idexing of one table.
I have multiple tables, which have all, the columns descr and tagnr. I want to make a query sth like this:
select table1.column, table2.columnd... where contains(indexed field,'gas within descr',1)>0
is it possible to index 4 seperate tables, without having a collective key? I dont want to make a Concatenated Datastore.
I have wrote this code.
But it doesn't work. It's been compiled fine. But I don't get any result with my queries.
create or replace
procedure My_Proc_Wide
Must be in ctxsys schema.
In a full-scale example, this would be a wrapper
for a proc in the user schema.
rid in rowid,
tlob in out NOCOPY clob /* NOCOPY instructs Oracle to pass
this argument as fast as possible */
is
v_descr varchar2(80);
v_tagnr varchar2(30);
v_descr_name constant varchar2(20) := 'descr';
v_descr_start_tag constant varchar2(20) := '<' || v_descr_name || '>';
v_descr_end_tag constant varchar2(20) := '</' || v_descr_name || '>';
v_tagnr_name constant varchar2(20) := 'tagnr';
v_tagnr_start_tag constant varchar2(20) := '<' || v_tagnr_name || '>';
v_tagnr_end_tag constant varchar2(20) := '</' || v_tagnr_name || '>';
v_buffer varchar2(4000);
v_length integer;
begin
/* verify the env which called this */
if Dbms_Lob.Istemporary ( tlob ) <> 1
then
raise_application_error ( -20000,
'"IN OUT" tlob isn''t temporary' );
end if;
/* the real logic */
/* first tabel to be indexed */
select t1.tagnr, t1.descr
into v_tagnr, v_descr
from tweb.pdp_positions t1
where t1.rowid = rid;
v_buffer := v_tagnr_start_tag ||
v_tagnr ||
v_tagnr_end_tag ||
v_descr_start_tag ||
     v_descr ||
     v_descr_end_tag;
v_length := length ( v_buffer );
Dbms_Lob.WriteAppend(tlob, length(v_buffer) + 1, v_buffer || ' ');
/* second table to be indexed */
select t2.tagnr, t2.descr
into v_tagnr, v_descr
from tweb.pdp_schema_equ t2
where t2.rowid = rid;
     v_buffer := v_tagnr_start_tag ||
v_tagnr ||
v_tagnr_end_tag ||
v_descr_start_tag ||
     v_descr ||
     v_descr_end_tag;
v_length := length ( v_buffer );
Dbms_Lob.WriteAppend(tlob, length(v_buffer) + 1, v_buffer || ' ');
/*third table to be indexed */
select t3.tagnr, t3.descr
into v_tagnr, v_descr
from tweb.pdp_equipment t3
where t3.rowid = rid;
     v_buffer := v_tagnr_start_tag ||
v_tagnr ||
v_tagnr_end_tag ||
v_descr_start_tag ||
     v_descr ||
     v_descr_end_tag;
v_length := length ( v_buffer );
Dbms_Lob.WriteAppend(tlob, length(v_buffer) + 1, v_buffer || ' ');
/* fourth table to be indexed */
select t4.tagnr, t4.descr
into v_tagnr, v_descr
from tweb.pdp_Projcode t4
where t4.rowid = rid;
     v_buffer := v_tagnr_start_tag ||
v_tagnr ||
v_tagnr_end_tag ||
v_descr_start_tag ||
     v_descr ||
     v_descr_end_tag;
v_length := length ( v_buffer );
Dbms_Lob.WriteAppend(tlob, length(v_buffer) + 1, v_buffer || ' ');
end My_Proc_Wide;
what have I to do, to make this work?
Any Help would be appriciated!!
Kind Regards,
Arsineh

Arsineh,
I realise that it has been quite some time since you posted this question but I thought I'd reply just in case you never did manage to get your user datastore working.
The reason your procedure will not work is simple. A user datastore procedure accepts a rowid input parameter. The rowid is the ID of the row that Oracle Text is currently trying to index. In the example you have given, you are attempting to use the supplied rowid as the primary key for multiple tables, this will simply never work as the rowid's across multiple tables will never correspond.
The best way to achieve your goal is to create the index on a master table which contains the common primary keys for each of your four tables e.g.
MASTER_TABLE
COL:COMMON_KEY (NUMBER(n))
COL:USER_INDEX_COLUMN (VARCHAR2(1))
If you create the user datastore index on the MASTER_TABLE.USER_UNDEX_COLUMN column your stored proc simply needs to read the correct row from the MASTER_TABLE (SELECT t.common_key into v_CommonKey FROM master_table t WHERE t.rowid = rid) and issue subsequent queries to extract the relavant data from the t1..t4 tables using the common key e.g.
SELECT t1.tagnr, t1.descr into v_tagnr, v_descr FROM t1 WHERE t1.[PRIMARY_KEY_FIELD] = v_CommonKey;
SELECT t2.tagnr, t2.descr into v_tagnr, v_descr FROM t2 WHERE t2.[PRIMARY_KEY_FIELD] = v_CommonKey;
and so on...
Hope this helps
Dean

Configuring Multiple Schemas in Oracle ADF application

Hi,
Thanks all for the replies for my previous posts :-)
We have a requirement in which we need to configure our application for multiple Database schema. At runtime based upon the logged in user we need to get data from the schema related to that user.
These schema may be on same Database instance/server or may be on different DB servers.
The requirement is like this
Logged in User DB schema configured
"A" ASchema @ 127.0.0.1
"B" BSchema @ 127.0.0.2
"C" ASchema @ 127.0.0.1
"D" Dschema @ 127.0.0.2
based on the User login (which is happening through one OID system), I need to fetch data from different schema (configured for different application).
These schema have different set of tables but set of table we require for our application are of same structure.
Same structure means same Table names with same relations.
Please let me know can we do the same in Oracle ADF application and How?_
One more requirement is that if i add a user at runtime and configure the DB schema for this user, All data related to this users will be loaded from this Schema which is configured for this user.
Thanks in Advance,
Amit
newbie to Oracle ADF
Edited by: ur.amit on May 10, 2010 3:17 PM

You can try the below example to change database at run time.
in the filter change the connection and not the credentials
http://www.oracle.com/technetwork/developer-tools/jdev/dynamicjdbchowto-101755.html#03.
Most of the other part is done to handle state management tables, which you might also have to do unless you use a file passivation store or if its ok to passivate to a single database always.
If its ok to passivate to a single db always. Hard code the jbo.server.internal_connection in the AM configurations to a DB jndi name.
Adf allows you to activate and passivate to a different database other than what you are connected to get and put data.

Validate a XML file against multiple schema files

Hello everybody!
How can I validate a XML file against multiple schema files?
I have the following XML file:
<?xml version="1.0" encoding="UTF-8"?>
<bulkCmConfigDataFile xmlns:es="SpecificAttributes.3.0.xsd"
xmlns:xn="genericNrm.xsd"
xmlns="configData.xsd">
<fileHeader fileFormatVersion="32.615 V4.2" vendorName=""/>
<configData dnPrefix="Undefined">
<xn:SubNetwork id="3G">
<xn:SubNetwork id="RNC01">
<xn:MeContext id="RNC01">
<xn:VsDataContainer id="RNC01">
<xn:attributes>
<xn:vsDataType>vsDataMeContext</xn:vsDataType>
<xn:vsDataFormatVersion>SpecificAttributes.3.0</xn:vsDataFormatVersion>
<es:vsDataMeContext>
<es:userLabel>RNC01</es:userLabel>
<es:ipAddress>172.21.3.17</es:ipAddress>
<es:neMIMversion>vF.5.0</es:neMIMversion>
</es:vsDataMeContext>
</xn:attributes>
</xn:VsDataContainer>
</xn:MeContext>
</xn:SubNetwork>
</xn:SubNetwork>
</configData>
<fileFooter dateTime="2006-11-24T11:56:07Z"/>
</bulkCmConfigDataFile>
I want to load this file into a table, validate it (against SpecificAttributes.3.0.xsd, genericNrm.xsd and configData.xsd) and query that table. How would the INSERT .. and the SELECT ... for userLabel attribute look like?
Many thanks!

Hi Peter,
Please use the validateXML BPEL Property : This property validates incoming and outgoing XML documents. If set to true, the Oracle BPEL Process Manager applies schema validation for incoming and outgoing XML documents. This property is applicable to both durable and transient processes. The default value is false.
Cheers
A

Multiple schema, but instance doc does not have namespace

Is it possible to successfully validate an instance document without namespaces against multiple schema with different namespaces?
example:
this is the normal xml which is valid with all the namespace:
<MyRoot dateTime="040112061834" instanceIdentifier="NTNDEC13541" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://org.schema.ntn" xsi:schemaLocation="http://org.schema.ntn ntn.xsd" xmlns:cbc="http://org.schema.cbc cbc.xsd">
     <cbc:MessageVersion>040</cbc:MessageVersion>
     <cbc:SenderID>2344134</cbc:SenderID>
     <cbc:RecipientID>3485774</cbc:RecipientID>
     <cbc:TotalNumberOfDeclaration>1</cbc:TotalNumberOfDeclaration>
</MyRoot>but I want to remove all namespace
<MyRoot>
     <MessageVersion>040</MessageVersion>
     <SenderID>2344134</SenderID>
     <RecipientID>3485774</RecipientID>
     <TotalNumberOfDeclaration>1</TotalNumberOfDeclaration>
</MyRoot>now is it possible to validate programmatically using sax the above xml against multiple schema? can i do it without any namespace at all??
thanks

Hi Larry, Thanks for your reply along with Muppet Mark, If I changed the color settings originally it was not my intension, I was simply just opening the next project to work on and viola’ “missing profiles”.
Attachment (picture) 7 was my last setting for color prior to your email, and yes I was messing around with this last night comparing it to one of our old G4’s, so I can’t remember where it started out before I got my hands on it.
Attachment (picture) 8 is my current settings based on your email recommendations.
Attachment (picture) 6 is the message I receive when I open any files created prior to these changes I just made. However after I open and resave the file I no longer receive this (picture 6) message.
My question is will my color be back to where it was before the problem started last week. In looking over one of the files I opened (I design/build transportation maps btw) most of the color is where I usually have it set however some colors were fractional as if they were converted from spot colors. SO I’m not sure what to do except go through all the known colors and make sure they are where I usually would set them, or do you have a better suggestion.
Oh by the way – for all you guys that are helping lunch is on me at McDonalds on Michigan St in Grand Rapids, MI!!
#7
#8
#6

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.

Browsing multiple schemas in SQL Developer

Hello,
I have been using Toad before and I just started using SQL Developer. In Toad we have the abillity to browse through multiple schemas by selecting the appropriate schema from the drop down list. However when I login via SQL Developer it seems I get to browse only the schema associated with my username even though I can run queries against tables that reside in other schemas. How do I browse through multiple schemas via SQL Developer? I am using SQL Developer v1.2.1.
Regards.

Hi,
Look for "Other Users".
K

Does XDB supports validating xml against multiple schemas?

The XMLType has some methods for validating an xml documents against a schema, e.g., SCHEMAVALIDATE, etc.. does XDB support validating xml against multiple schemas (Just like what JAXP or Xerces have done)? Or what's the current situation about this issue? thanks.

did you try using the import schema element instead of the include elemnt?

Object type for multiple/text/unrestricted property

          Hi,
          Does anybody know what's the object type for multiple/text/unrestricted property.
          I tried to use um:setproperty tag to set the value of a multiple/text/unrestricted
          type property in jsp. I got the following error if the object type I use is ArrayList:
          javax.transaction.TransactionRolledbackException: Transaction: '995540362044_8798'
          rolled back due to EJB exception:
          java.rmi.RemoteException: EntityPropertyManagerImpl.insertTypeSpecificValue():
          caught ClassCastException. The reason might be because the type of the passed
          value does not mismatch the property type stored in schema information. Expected
          object type is: 3 and the object type was: java.util.ArrayList
          Does anybody know what's this type 3 object?
          Br,
          -Niyue Chen


Hi All,
I need to convert the amount value in comma to dot say 1000,00 to 1000.00.Any function module is there to convert it.After converting it i need to pass this value as exporting parameter to a function module having data type as character(lenght 13).
Thnks
Deb

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

Oracle Portal w/ Multiple Schemas

I posted this in the Architecture forums, but it looks like this forum may be better or yield more results for what I'm looking for.
We are just about to launch a Portal initiatve and are looking for best practices for implementing a single instance of Oracle Portal that interacts with multiple schemas. Has anyone here done this or know where I can find this type of info? I have a few questions about how this works, how scalable it is, how security is handled, yada yada yada. --Kind Regards, Derek.

Hi jlubbers. Thanks for your reply.
After some additional disucssions with our DBAs, I think I may have left a misleading post in respect to schemas. Our company acts as an application service provider to some degree. The way the databases are setup, each of our client agencies have their data stored completely separately from other agencies. The table structures are almost exactly identical (and can be considered identical for the scope of this discussion) and will never be merged together.
We want to leverage Oracle Portal as much as we can while also getting as much reuse as we can. Each time we get data from the database, we want the datasource to be dynamic based on the usergroup.
One constraint that we have is that the physical database connection must be connected as the user that's logged into the portal, so I think we have to do some type of User Proxy, but we're not 100% sure how to do that and what that means for all of our java applications.
I'll check out your other posts and see if there is anything in there that may help. Thanks for taking the time. --Derek

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

Exp for multiple schemas

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