Db in shared or dedicated mode

Hello,
on DB 11.2.0.1, we have parameter SHARED_SERVERS set to 1 (also, DISPATCHERS parameter), but a connection is made through tns with a definition containint '(SERVER = DEDICATED)'.
Is this database running in shared mode?
AFAIK, it's only necessary to set shared_servers to a value greater than 0, and it's in shared mode... am I right?
regards

If you specific (SERVER = DEDICATED) in connect string or sqlnet.ora dedicated_server = on then all connections are DEDICATED. In v$session column server give you the process using shared connection (value SHARED or NONE).
HTH
Antonio NAVARRO
Remember some connections (rman, batch process, etc.) must no be in shared.

Similar Messages

Nexus 7009 bandwidth allocation per port in shared and dedicated mode:

We have 7009 with following I/O modules:
N7K-F248XP-25E --
N7K-C7009-FAB-2 - qty 3
N7K-SUP2
I would like to know that each port of N7K-F248XP-25E will get how much bandwidth in shared mode. if we are using only one port group with 4 ports each port with 10gbps is it possible in shared mode to get 40gbps in one port group.
Thanks

Hi,
I'm not sure there is such a thing as shared and dedicated mode on the N7K-F248XP-25E I/O module. I don't have one to test with, but you can see this if you execute the command show interface capabilities on your switch. If you look for the "Rate mode" line in the output it will show as dedicated or dedicated/shared. I suspect the ports on this module will all show as dedicated.
That said, with your configuration there is potential for some level of over-subscription.
The N7K-F248XP-25E I/O module uses a Switch on Chip (SoC) architecture with the 48-ports 10-GE ports connected via 12 SoCs, so the "port grouping" is ports 1-4=SoC 1, 5-8=SoC 2 etc.
Each of the SoC has 40-Gbps of capacity to the switch fabric ASIC, which in turn has up to 550-Gbps capacity to the switching fabric. The 550-Gbps fabric capacity is the maximum based on 110-Gbps per slot, per fabric to the installed Fabric 2 Modules. To realise this capacity there must be five Fabric 2 modules installed in the chassis.
From the hardware list you've supplied, you only have three Fabric 2 modules installed and as such you can only achieve a maximum of 330-Gbps per I/O module slot. What this means is that you have 480-Gbps host facing bandwidth, but 330-Gbps Fabric facing bandwidth, so a potential 1.45:1 over-subscription.
You can reduce the over-subscription into the switch fabric by adding additional Fabric 2 modules.
Regards

Can oracle work in shared and dedicated mode at the same time?

Hi All,
can oracle work in shared and dedicated mode at the same time?
Thanks

A database can work only in one mode at a time.
If the database is started in Dedicated Mode then it can not run in the Shared Mode. If you need to run it in the Shared Mode, bring down the Database , change DISPATCHERS, SHARED_SERVER, SHARED_SERVER_SESSIONS parameters in initfile and bring up the database to run it in Dedicated Mode.
But there is one catch here, if you have started the database in Shared Server Mode even then you can make a Dedicated connection to server.
Thanks!
M-

Shared and Dedicated Mode in Oracle 8i

Can any one describe what is basic difference when we install Oracle8i in dedicated and Shared modes. I have to create Oracle8i Database for not more 150 users. Actually less then 20 users might be accessing database but in future it can go up to maximum 100.

WIthout understanding your application and hardware in some detail, it is impossible to say which mode is better-- and that's without accounting for a mixed-mode setup where some connections are shared and some are dedicated.
If there are going to be 20 simultaneous connections, dedicated server is almost always preferred. If you start to get up to 100 simultaneous connections, depending on your hardware, it may become appropriate to use shared server. If you have a high-end multi-CPU machine, it will easily handle 100 connections. If you have a low-end single-processor Windows server, you might have problems with dedicated server.
OLTP systems tend to be more amenable to shared server than DSS systems, because sessions spend a lot of time idle in the former type of application.
Justin
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC

Shared vs Dedicated

how do we check weather database is running in Shared or Dedicated mode? and how to switch between modes?

http://download-west.oracle.com/docs/cd/B10501_01/server.920/a96521/manproc.htm#8715

Shared and Dedicated server modes

Hi,
We have been having some issues with connections and listeners. Please find here... Link [Post1|http://forums.oracle.com/forums/message.jspa?messageID=3665455] and Link [Post2|http://forums.oracle.com/forums/message.jspa?messageID=3677914].
Despite this help from this forum, I still face some problem configuring listener in both Shared and Dedicated server modes.
Pls find the below the problem...
Two listeners namely, LSNR1 and LSNR2 have been started.
listener.ora:
LSNR2 =
(DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = dbdev.website.org)(PORT = 1522))
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
SID_LIST_LSNR2 =
(SID_LIST =
    (SID_DESC =
      (SID_NAME = TESTDB)
      (ORACLE_HOME = /u02/app/oracle)
LSNR1 =
(DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = dbdev.website.org)(PORT = 1521))
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
SID_LIST_LSNR1 =
(SID_LIST =
    (SID_DESC =
      (SID_NAME = TESTDB)
      (ORACLE_HOME = /u02/app/oracle)
)LSNR1 works with both Shared and Dedicated configurations, whereas LSNR2 neither DEDICATED nor SHARED configurations...
Here is the TNS names entry at the client (for LSNR2)...
serv2=
(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = xxx.xxx.xxx.xxx)(PORT = 1522))
    (CONNECT_DATA =
      (SERVICE_NAME=DEDICATED)
)When I try to connect using this, it says
+ ORA-12514: TNS: Listener does not know of service requested in connect descriptor +
Pls help.
Thanks,
Aswin.

Aswin,
I didnt see the other posts but the error is fairly simple,
>
ORA-12514:
TNS:listener does not currently know of service requested in connect descriptor
Cause:     The listener received a request to establish a connection to a database or other service. The connect descriptor received by the listener specified a service name for a service (usually a database service) that either has not yet dynamically registered with the listener or has not been statically configured for the listener. This may be a temporary condition such as after the listener has started, but before the database instance has registered with the listener.
Action:
- Wait a moment and try to connect a second time.
- Check which services are currently known by the listener by executing: lsnrctl services <listener name>
- Check that the SERVICE_NAME parameter in the connect descriptor of the net service name used specifies a service known by the listener.
- If an easy connect naming connect identifier was used, check that the service name specified is a service known by the listener.
- Check for an event in the listener.log file.
>
So check what you are passing in the connection string.
HTH
Aman....

Is our oracle 9iR2 db is a shared mode or dedicated mode? whats difference?

Friends,
We are using Oracle 9iR2 Database. How can i know our db is a shared Server architecture or a dedicated server architecture?
Also, what is the difference between these two? Please tell me in short.
Note: I didn't install/create our db.
Thanks
Sathyguy

Check out the distinct values in SERVER column in V$SESSION. If it reads DEDICATED, then you are in dedicated mode. If it reads NONE or SHARED, the you are using MTS (or shared server mode).
You can have DEDICATED connection in MTS mode also by changing the TNS entry.
Dedicated mode: Each of these client connections takes up some resources (memory, CPU time, net-work bandwidth…) on the database server. More the number of client connections, more is the resource consumption, more is the delay is processing the requests.
A database serving an application, where-in most of the server processes spawned by the client requests are idle for 90+% of the connect time, is a good candidate for Ora-cle Multi-Threaded Server (MTS) mode configuration.
Multi-Threaded Server is configuration method in which one server process can handle more than one client connections/processes/requests.
As there are a few number of server processes created on server, the server re-sources are utilised to a minimum. This enables the database administrator to define more number of dispatcher processes to handle the requests from the clients and more number of shared server processes that handle and process the requests be-tween these dispatchers and database kernel

Dblink not working in dedicated mode

Hi
All,
my application tried to access the database in dedicated mode but when it's trying to connect to other database from the original database using DBLINK then it's throwing me ora-24777 use of non-migratable database link not allowed.
--> when i use databases in shared server mode then it's even not connecting to the main database itself.
Vish
Message was edited by:
vishal patel

vishal, how about posting some useful information like:
What full version of Oracle?
The link DDL so we can see if it is public or private, has an imbedded userid and password or connects using the current user, etc....
According to the error message:
$ oerr ora 24777
24777, 00000, "use of non-migratable database link not allowed"
// *Cause: The transaction, which needs to be migratable between sessions,
// tried to access a remote database from a non-multi threaded
// server process.
// *Action: Perform the work in the local database or open a connection to
// the remote database from the client. If multi threaded server
// option is installed, connect to the Oracle instance through the
// dispatcher.
It looks like you have shared server in use and are trying to use the link via a dedicated session but need to use it via a shared server connection.
HTH -- Mark D Powell --

Migrating a peer-keepalive link to dedicated mode ports.

Hi
Currently our two Nexus 7010 switches use shared mode ports in the port channel that forms the peer-keepalive link between them.
As we are replacing the modules that these peer-keepalive links are on with non blocking modules we want to migrate the ports to dedicated mode.
The Cisco documentation suggests you cannot have both shared mode ports and dedicated mode ports in the one L2 port channel.
In this case has anyone tested whether it would work to just remove the channel-group (associated with the peer-keepailve link) from all of the old shared mode ports and add it to the new dedicated mode ports ? Or will the port channel complain because it was originally created with shared mode ports ?
thanks

Hi
Currently our two Nexus 7010 switches use shared mode ports in the port channel that forms the peer-keepalive link between them.
As we are replacing the modules that these peer-keepalive links are on with non blocking modules we want to migrate the ports to dedicated mode.
The Cisco documentation suggests you cannot have both shared mode ports and dedicated mode ports in the one L2 port channel.
In this case has anyone tested whether it would work to just remove the channel-group (associated with the peer-keepailve link) from all of the old shared mode ports and add it to the new dedicated mode ports ? Or will the port channel complain because it was originally created with shared mode ports ?
thanks

"Dispatchers" parameter in dedicated mode

Hello,
I've noticed that the "dispatchers"' parameter in dedicated mode looks like this (on 10.2.0.1.0 db) :
dispatchers=(PROTOCOL=TCP) (SERVICE=sidXDB)
What is the SERVICE parameter for, and why is it set to this default value in dedicated mode ?
Is the SERVICE parameter always set for dedicated servers only ?
Otherwise, how can I recognize dedicated and shared mode when I look at the insatnce parameters ?
thank you
Regards,
Antoine

Actually you can configure a instance to use dedicated server mode and shared server >mode at the same time: it's up to the client to connect using the right configured service >that will make the right mapping.You are right Pierre.
But I've tried to configure several instances with DBCA wizard, both in dedicated and shared mode :
- when dedicated mode is selected, dispatchers parameter is set like this : "dispatchers=(PROTOCOL=TCP) (SERVICE=sidXDB)", and all connections at the instance will be in by default dedicated mode, even if the "shared_servers" parameters is greater than 0
- when shared mode is selected, dispatchers parameter is set like this : "dispatchers=(PROTOCOL=TCP)"
I thought that the instance would run automatically in shared mode if the "shared_servers" parameters is greater than 0, but that's untrue
Besides, I don't understand the link between the "(SERVICE=sidXDB)" option, which seems to be related to the XML database, and the connection mode to the instance.
This is quiet confusing to me, there is obviously something I don't know or I don't understand

Oracle 10 database from Shared to dedicate mode..??

Hi ,
Could anyone tell me how to change a database in shared mode to dedicated mode.
Thanks in advance.

Werner,
At first the database is in dedicated mode and I have changed it to shared mode yesterday. Maximo(tool) is running on that server as I changed to shared one the maximo application is running slow(may be the reason dedicated->shared) so here people are saying me to convert again it to dedicated mode even I say that it may not be the right reason.But I have to change it as per their wish dynamically.
So could you please tell me how to change the database to dedicated dynamically . I converted it to shared dynamically so hopefully there will be a solutoin for my query..
Thanks in advance

How do debug an application in Shared Memory debug mode using JDev

I don't see the option of using "Shared memory" debug mode in JDev. There is only socket debug option(Attach/Listen) in debugger but no shared memory debug option.
Is it missing or is it hidden somewhere.
Can anyone let me know as all IDEs provide that.

Any updates?

Shared versus dedicated connections in the fragmentation of shared pool mem

Hi,
I have a old Oracle 8.1.7 database server.
I have a legacy application with no source code. This application don't use memory efficiently (no bind variables, etc.) , ie memory becomes fragmented.
I know that exists two ways to connect the database (dedicated and shared)
Based on this, I want to know which of the two options creates more fragmentation. I know that recommendation is to use dedicated connection, but I'm not sure if this is recomendation is applicable in this particular environment.
Thanks in advance.

Whether you use shared or dedicated connections makes no difference for fragmentation in the shared pool. Whether your hard parse or do not hard parse does matter.
Measures you can take
- make sure often used packages like dbms_standard are pinned in the shared pool using a startup trigger
- set session_cached_cursors to 50 or 100. This will reduce parsing.
Sybrand Bakker
Senior Oracle DBA

Shared and Dedicated Server...

Dear All,
Can anybody tell what's the difference between shared and dedicated server? Our database is Oracle 9.0.1 in Windows 2003. Our total session is around 200. Our server is dedicated server. What will be the benefit if we change our database to shared server for specific users???
Shared pool size = 728MB
Buffer Cache = 592MB
Java pool = 104MB
Large pool = 60MB
There is no pga_aggregate_target in our database. Is the configuration ok for more than 200 users??? Most of the times we get 'out of process memory error'. What should we do in this situation??? Plz suggest.

mrashid07 wrote:
Can anybody tell what's the difference between shared and dedicated server?Dedicated server is the default. It means that each and every user session is serviced by a dedicated Oracle server process. 200 user connections? 200 dedicated server processes.
On Windows these are however threads inside the physical oracle.exe process (and not actual separate process images like on Unix/Linux for example). A standard thread on Windows needs around 2MB of kernel space. So 200 threads, for 200 dedicated server connections, need 200 x 2MB RAM.
Shared server works differently. A pool of dispatchers and shared servers are created. The dispatcher processes deals with the communication between the Oracle client and the Oracle instance. A dispatcher places client requests on a virtual circuit. These requests are picked up by idle shared server processes and processed. The results are send back to the client via a dispatcher process.
So instead of having 200 dedicated server processes to service 200 users, you can for example use 5 dispatcher processes and 30 shared server processes to service the 200 sessions of those 200 users. In this case 35 processes are used that translates into 35 threads at a basic 2MB RAM cost per thread. (also note that the UGA now moves from the Oracle PGA to the Oracle SGA and the SGA needs to be sized accordingly).
However, should such a user session send a long and complex request, that will tie up that shared server for a long time.. and this is bad. When the shared server process is busy, it cannot service any new requests. When all the shared servers in the pool are busy, no new request can be serviced. So you want the requests from the clients to be short and sweet - with a shared server not spending more than a few seconds per request.
So typically OLTP requests are fine for shared servers.. OLAP requests not.
Our database is Oracle 9.0.1 in Windows 2003. You should have been on 9.2.0.7 (last 9i patch set). You should currently being in the process of upgrading to 11gR2. 9i is basically an unsupported product. It is not a good idea to use an unsupported product in production. Even worse when you are not using the latest patchset for that product.
As for using Windows.. why? 32bit is old hat. 64bit CPUs are standard even in today's desktop PCs. Consider using Linux instead. It is Open Source, is free ito purchasing (you only pay for support and maintenance) and it has had de-facto 64bit support for many years now. There's no need to hack the operating system, like Windows with its AWE extensions to address more than 4GB RAM.

How can Manage Permissions for DB in Shared Services Security Mode

In shared services security mode, after provisioning users for Essbase applications, only can assign database calculation and filter access. How can I grant permissions "Access Databases" like in native mode?

Essbase will be default be in shared services security mode in 11.1.2, the wizard will not migrate security when in this mode.
It is possible to revert it back but if you don't know the process then it is worth looking at alternatives first.
You could use LCM to export the provisioning and then import into your target environment.
Cheers
John
http://john-goodwin.blogspot.com/

Db in shared or dedicated mode

Similar Messages

Maybe you are looking for