Multiple Database Servers Question

Hi,
Please forgive this ignorant question, but can someone tell
me how one would go about using multiple database servers?
Just as there comes a time where one would need more than
one web server and would need to use a load balancing
solution, what happens when one would need more than one
Database Server?
How does one go about implementing that solution?
Is there some way to have two database servers carrying the
same information with some kind of load balancing solution
in front of it(?) or does one place some tables on one
Database
server, and other tables on the other database server?
(I have no clue as to how things would work.)
Thanks in advance,
Joe

Microsoft SQL allows for clustering of SQL databases, so for
instance two servers connected to a fileshare and a virtual address
shared across the two physical boxes. Database connections are made
to the virtual addres which will then be handled by the active
node. Becuase a database is ultimately a file(s) on a disk it can
only be attached to one node at a time so you end up with an
active/inactive cluster.

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Installing one APEX for multiple databases servers.

Hello, everyone.
I'm new on this world of Oracle solutions, and I would like
very much your help.
Here in my company I have five database servers, and I want to install
the Oracle Apex in a way that I only need access one webpage and have
the possibility to edit all the database.
For instance:
Imagine that I have five machines and each one has a instance of one database.
I would instal the Apex on each machine. But I would like to open the Apex on
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Is that possible? If it is, could be done with XML DB server? What is the best HTTP server to use in this case?
Thanks for your attention.
Sorry if I wasn't clear, I'm new and I'm learning.
Regards, Leandro R. de Freitas.

Hi,
as you describe this, it is not possible. An Apex instance is installed in an Oracle instance and is as a result is tied very closely to that instance.
That being said, it is still possible to access data in different database instances from a seperate database by the use of database links, though this is can be a little complicated and not always desirable from a performance point of view. Whether this is desirable in your instance depends on the architecture of your applications.
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Generic Reports accessing Multiple Database Servers

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I am doing the samething.
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Question on installing Multiple Directory Servers

Hello All,
I seem to be having a problem installing multiple directory servers, and I was hoping that somebody could help me. Here is what I am trying to do:
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HTH

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How to configure multiple report servers in Oracle 10 G R2?

I want to configure multiple report servers with my application deployed on Oracle 10G R2. Since R2 does not support report server clustering, how can this be achieved without any change in the application?
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Hi Martin,
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I need to configure a SunBlade 2000 configured with an XVR1000 graphics board to be used by 2 people simultaneously with the own keyb & mouse.
To summarize :
1 Sun Blade 2000
1 Xvr1000
First Port connected to one monitor /dev/fbs/gfb0a
Second Port Connected to a second monitor /dev/fbs/gfb0b
2 Keyb & 2 mouse connected to the 4 USB ports
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indipendently.
I tried the following procedure with NO success.
Does anybody can help me ?
Thanks in advance
Luigi Paganini
=============================================================================
In recent versions of Solaris, the Xsun keyboard & mouse DDX modules
have been extended to support multiple keyboards and mice on Solaris.
The Xorg server on Solaris x86 has similarly been extended to support
multiple mice, but not yet multiple keyboards.
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supported - but you must pay close attention to the configuration
instructions and Limitations described below.
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multiple input devices:
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extension (commonly used for accessibility helper programs, or for x86
laptop users)
* Multiple X servers, each with its own set of input & output
devices ("multi-seat" mode)
The two methods can be mixed on a single machine - when configuring you
simply need to determine which X server each device is going to be
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Requirements
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* USB-capable machine
* For Solaris 9, USB patch 115338-01 (sparc)/115339-01 (x86) or
newer. For Solaris 10, s10_17 or newer.
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Due to the nature of USB and Sun's implementation, USB devices may get
different numbers when initialized or hot-plugged in a different order.
A partial solution is to use the full path name under the /devices
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so the order is no longer a problem, but devices must always be plugged
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Xsun Configuration
The following sections may be added to either
/etc/openwin/server/etc/OWconfig or /usr/openwin/server/etc/OWconfig.
Xsun reads both when starting up and merges their contents.
* 1. Run ls -l /dev/usb/hid* to see what the existing device names are.
* 2. Attach the additional input devices to the machine
* 3. ls -l /dev/usb/hid* to see what the newly attached device names
are. Note at the end of each symlink line it will list whether it is a
keyboard or a mouse.
* 4. Add lines of the following form to OWconfig, one for each
device, and each with a unique name beginning with "IMOUSE" or "IKBD":
# sun Keyboard module
class="XINPUT" name="IKBD2"
dev="/dev/usb/hid2" strmod="usbkbm"
ddxHandler="ddxSUNWkbd.so.1"
ddxInitFunc="ddxSUNWkbdProc";
# sun Mouse module
class="XINPUT" name="IMOUSE2"
dev="/dev/usb/hid3" strmod="usbms"
ddxHandler="ddxSUNWmouse.so.1"
ddxInitFunc="ddxSUNWmouseProc";
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(in this case ":1"):
class="XDISPLAY" name="1"
coreKeyboard="IKBD2" corePointer="IMOUSE2"
dev0="/dev/fb1";
* 6. Test your configuration. For multiseat mode, run an Xserver on
the display you listed (xinit :1 or add a line for :1 to
/etc/dt/config/Xservers ). For use with the X input extension, restart X
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The report gets called via the rwservlet (hope that answers your question correctly)
The application is in OAS.
The separation i require is both in the database and the reports themselves.
For example let's say i have devapp and testapp - both the exact same app. But they both need to access reports under the same key, but the report needs to get its info from its respective dev and test databases. The key is hardcoded so can't change.
If i understand correctly (a big "if"), the cgicmd.dat file tells wich report to grab and which database to connect to based on the key. Is there a way to have separate key map files (cgicmd.dat) called by separate applications? So that devapp will get Report1 using devdatabase, where testapp wil get Report1 using testdatabase?
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BSPs configuration with multiple apps servers

Hi Masters,
This is regrarding configure ICM and BSPs on our production box with multiple application servers.
We have our production box in a cluster environment.
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As part of our production box to SAP 4.7 upgrade from 4.6C, we are asked to configure the environment to deploy BSPs. We have successfully configured and deployed the BSPs in our DEV and QAS system (Both are central instances with no application servers) except production box which is due in the next month.
The process we follow to activate BSPs is as follows:
1.Define an ICM service port in /etc/services file.
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Subsequently What I am enquirying is:
Do I need to define ICM service ports on each and every hosts where the application servers are running?
Do I need to make changes to each and every instance profile of the application server?
What are the differences in configuring ICM services on central instance and application instances?
Appreciate any help in this regard.
Thanks and Regards
Murty Patchipala

Grasshopper,
I think what you should really read up on is the SAP WebDispatcher. If are serious about running BSP/ICM across multiple app servers, this is the key technology:
http://help.sap.com/saphelp_nw04/helpdata/en/42/5cfd3b0e59774ee10000000a114084/frameset.htm This may also answer some of your questions about profile parameters.
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Is it possible to deploy SharePoint or its Service Applications on: multiple DB-Servers and multiple SQL Instances?

Hello Forum,
We have a SharePoint 2013 farm (Enterprise edition) that uses one single SQL Server 2012 (Standard edition). That statement means: All my SharePoint DBs e.g. (Config, Admin, Content, and Service Apps) DBs are hosted and running onto one single instance e.g.
Server1\SQLInstance1.
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Instead, We have other separate SQL Server instance which is enterprise edition let's name it (ServerX\InstanceX) that is running standalone, and we are thinking or using it, and my 2 questions are:
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2) My second question is the same: Can I create PerformancePoint services application in my SharePoint farm, But in the Database Server field, I fill up
the details of the other DB server ServerX\InstanceX which is the one that is SQL
enterprise edition ? Will this work ?
Any official Microsoft resources/links tell that it is possible to deploy SharePoint or its service applications on multiple DB-Servers and multiple SQL Instances?

Thank you Alex and Anil,
What are the ramifications of that?
I mean, Assuming that I have created such a farm where most of SarePoint DBs in Standard SQL instance while the PerformancePoint service application and others e.g. PowerPivot and reporting service are deployed and configured onto other Enterprise SQL instance.
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Multiple databases in one file: a small snafu

Hello everyone,
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(begin fragment)
However, since multiple databases in a file exist in a single physical file, opening two databases in the same file simultaneously requires locking be enabled unless all of the handles are read-only. As the locks for the two databases can only conflict during page allocation, this additional locking is unlikely to affect performance.
(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.
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Consider BDB configured as a concurrent data store.
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// 1
cursor2 = db2->cursor(...)
while(cursor2->c_get(... DB_NEXT...))
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db3->put(...)
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Answer 2: if db1, db2 and db3 reside in the same physical file, both threads block "sometimes".
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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:
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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?
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From your question it is clear you should read the document called the 'Oracle Concepts Manual'.
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Hello All,
I have read in a book which states that "according to J2ee Specification,a single transaction(an EJB method for example) may not be provided access to multiple JDBC resource providers.."
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Thanks

Hello Sebastien,
Thanks for your response!!!
Let me make it bit more clear.In deploymewnt descriptor,we define jndi name for any resource and do a lookup on that resource from the code.
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Multiple Database Instances on Single Server and effect of NLS_LANG

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