Multiple clients and multiple databases on one system

Does SAP support having a single system ( Let's call it PEQ for the sake of argument ) having multiple clients ( again, for the sake of argument, call them 200, 250, 260, and 300) allow for each client to have it's own physical database ?
For example, here is what I would like to have set up:
PEQ 200 - database 1
PEQ 250 - database 2
PEQ 260 - database 3
PEQ 300 - database 1
So PEQ 200 and 300 access database 1, PEQ 250 accesses database 2, and PEQ 260 accesses database 3.
I only want to know if this is possible and if so how would you set it up. I do not want to get into any discussion on whether this is the best way to go or not. Any pointers to OSS notes on the subject are more than welcome.
Thanks;
Bruce

> So PEQ 200 and 300 access database 1, PEQ 250 accesses database 2, and PEQ 260 accesses database 3.
>
> I only want to know if this is possible and if so how would you set it up. I do not want to get into any discussion on whether this is the best way to go or not. Any pointers to OSS notes on the subject are more than welcome.
Simple answer: No.
Long answer:
- Workprocesses don't know anything about "clients". A client is nothing more than an additional field in a table with the client number. So it's not possible to configure them to connect to a certain database using a "client number".
- A client alone has nothing but application data. It has no dictionary (tables, views) and it has no repository (source code) that can be executed
- A SAP system (ABAP) has cross client customizing that would need to be shared somehow, technically not possible since also here the workprocess (which is the lowest unit) does not know whether a table is client dependent or not.
Maybe there is a way to come out of this dilemma - if you tell us, what you (business) requirement is.
Markus

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Multiple databases in one file: a small snafu

Hello everyone,
Opening multiple databases in a single file is an administrative convenience. It is well explained in the manual (see db/docs/ref/am/opensub.html). Normally, there is little difference between databases in their own physical files or grouped together in a single physical file. There is one small sentence in the manual that says the following:
(begin fragment)
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(end fragment).
I didn't pay attention to it, except the "unlikely to affect performance" part which told me that I wasn't to worry about it. The sun was shining. Life was good.
And I was wrong. It was one of those "epic bug quests" I had to embark on, only to realise that it may not be a BDB bug, but my carelessnes. Nevertheless, I'm left with an uneasy feeling which I would like to explain here.
Consider BDB configured as a concurrent data store.
There are 2 threads. The first thread has the following pseudocode:
cursor1 = db1->cursor(...)
while(cursor1->c_get(... DB_NEXT...))
// 1
cursor2 = db2->cursor(...)
while(cursor2->c_get(... DB_NEXT...))
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db3->put(...)
db1, db2 and db3 are all distinct databases. All cursors are read-only (the cursor implicitly used in db3->put is of course a write cursor).
While the first thread is running, the second thread executes db3->put(...) at "//1".
Question: what happens?
Answer 1: if db1, db2 and db3 reside in different physical files, nothing special happens. Everything proceeds as it should.
Answer 2: if db1, db2 and db3 reside in the same physical file, both threads block "sometimes".
The "sometimes" used here means "when the put operation in thread 2 needs to allocate a new page".
Reading the BDB source code is extraordinarily difficult (which says more about my limitations than about the clarity of the code) but here is what happens, as far as I could determine:
(thread 1) cursor1 needs and acquires a read lock on db1
(thread 2) db3->put needs a write lock on db2 to allocate a new page. Since db2 is in the same physical file as db1 and thread 1 already has a read lock, thread 2 waits until the read lock is released. Thread 2 blocks.
(thread 1) cursor 2 needs a read lock on db3. For some reason, BDB detects that the another thread is waiting for a write lock on the physical file, and thread 1 blocks.
Both threads block waiting on each other to complete.
I suppose the system is the way it is to avoid starvation, but there you have it: be careful when you're lumping together multiple databases in one file!
Anyone who can clarify or confirm this is welcome.
Vincent

I had experienced a similar problem. I run multiple process. Each one of them starts a transaction that does db->put and db->pget to its own database (which also has a secondary index). When each database is in a separate physical file there is no problem but when I put all databases in a single file the processes start to dead-lock.
The following combination of options solved the deadlocking problem:
- use serializable isolation level instead of snapshot, i.e. do not pass DB_TXN_SNAPSHOT to txn_begin
- do not pass the DB_NO_WAIT option to txn_begin
- use Btree instead of a Hash
Hope that helps.

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Portal Content
SAP LiveCache
SAP NW - Adobe Docu. Service
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SCM WCL
XI Content
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plz anyone help me to export and import one of my user in the database to another laptop.....
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what's the oracle version on Source and Target Database release version? Take a look at the below links.
[http://wiki.oracle.com/page/Oracle+export+and+import+]
[Import_Export_FAQ|http://www.orafaq.com/wiki/Import_Export_FAQ]
Export
[Oracle Export Utility|http://www.psoug.org/reference/export.html]
[Oracle Import Utility|http://www.psoug.org/reference/import.html]
HTH
Anantha

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Edited by: 960187 on Sep 19, 2012 3:09 PM

960187 wrote:
Due to security updates we have chosen to remove all previous versions of Oracle CLIENT, and we currently have a WinBatch script that parses all home locations and then uninstalls the Oracle software from those home directories using the Oracle uninstaller.... yep you can see where this is going, on a PC with Oracle Database installed (IE Devs) their database(s) were uninstalled too DOOOHHHH!!
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Edited by: 960187 on Sep 19, 2012 3:09 PMThis is a fool's errand. The database home includes the client software. And that is necessary because there are times when the database instance itself has to take the role of a client.
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Hi all
Plz help me I have two data bases installed on my system Oracle
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Hi Arshad,
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HTH,
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Multiple clients and multiple databases on one system

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