How many databases can run in a server

How many databases can run in a server, how can we find how many databases are running there – in OS level for UNIX

You can have as many oracle instances as your system resources and kernel parameters allow you to.
A quick search to know how many oracle instances are running, check the OS processes:
ps -ef | grep smon
This will list all smon manadatory instance processes, this way you'll know how many concurrently instances are running.
~ Madrid.

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How many databases can be opened simultaneously in a single file?

To all:
I don't known how many databases can be opened simultaneously in a single file. After my application open 499 databases in a single file simultaneously, DB->open return error 12.(can not allocate memory ?).
How can i do ? Thanks.

I found it:
Berkeley DB Reference Guide:
Locking Subsystem
PrevRefNext
Configuring locking: sizing the system
The lock system is sized using the following three methods:
DB_ENV->set_lk_max_locks
DB_ENV->set_lk_max_lockers
DB_ENV->set_lk_max_objects
The DB_ENV->set_lk_max_locks, DB_ENV->set_lk_max_lockers, and DB_ENV->set_lk_max_objects methods specify the maximum number of locks, lockers, and locked objects supported by the lock subsystem, respectively. The maximum number of locks is the number of locks that can be simultaneously requested in the system. The maximum number of lockers is the number of lockers that can simultaneously request locks in the system. The maximum number of lock objects is the number of objects that can simultaneously be locked in the system. Selecting appropriate values requires an understanding of your application and its databases. If the values are too small, requests for locks in an application will fail. If the values are too large, the locking subsystem will consume more resources than is necessary. It is better to err in the direction of allocating too many locks, lockers, and objects because increasing the number of locks does not require large amounts of additional resources. The default values are 1000 of each type of object.
When configuring a Berkeley DB Concurrent Data Store application, the number of lock objects needed is two per open database (one for the database lock, and one for the cursor lock when the DB_CDB_ALLDB option is not specified). The number of locks needed is one per open database handle plus one per simultaneous cursor or non-cursor operation.
Configuring a Berkeley DB Transactional Data Store application is more complicated. The recommended algorithm for selecting the maximum number of locks, lockers, and lock objects is to run the application under stressful conditions and then review the lock system's statistics to determine the maximum number of locks, lockers, and lock objects that were used. Then, double these values for safety. However, in some large applications, finer granularity of control is necessary in order to minimize the size of the Lock subsystem.
The maximum number of lockers can be estimated as follows:
* If the database environment is using transactions, the maximum number of lockers can be estimated by adding the number of simultaneously active non-transactional cursors open database handles to the number of simultaneously active transactions and child transactions (where a child transaction is active until it commits or aborts, not until its parent commits or aborts).
* If the database environment is not using transactions, the maximum number of lockers can be estimated by adding the number of simultaneously active non-transactional cursors and open database handles to the number of simultaneous non-cursor operations.
The maximum number of lock objects needed for a single database operation can be estimated as follows:
* For Btree and Recno access methods, you will need one lock object per level of the database tree, at a minimum. (Unless keys are quite large with respect to the page size, neither Recno nor Btree database trees should ever be deeper than five levels.) Then, you will need one lock object for each leaf page of the database tree that will be simultaneously accessed.
* For the Queue access method, you will need one lock object per record that is simultaneously accessed. To this, add one lock object per page that will be simultaneously accessed. (Because the Queue access method uses fixed-length records and the database page size is known, it is possible to calculate the number of pages -- and, therefore, the lock objects -- required.) Deleted records skipped by a DB_NEXT or DB_PREV operation do not require a separate lock object. Further, if your application is using transactions, no database operation will ever use more than three lock objects at any time.
* For the Hash access method, you only need a single lock object.
For all access methods, you should then add an additional lock object per database for the database's metadata page.
Note that transactions accumulate locks over the transaction lifetime, and the lock objects required by a single transaction is the total lock objects required by all of the database operations in the transaction. However, a database page (or record, in the case of the Queue access method), that is accessed multiple times within a transaction only requires a single lock object for the entire transaction.
The maximum number of locks required by an application cannot be easily estimated. It is possible to calculate a maximum number of locks by multiplying the maximum number of lockers, times the maximum number of lock objects, times two (two for the two possible lock modes for each object, read and write). However, this is a pessimal value, and real applications are unlikely to actually need that many locks. Reviewing the Lock subsystem statistics is the best way to determine this value.
I created DB_CONFIG file, and add three lines:
set_lk_max_locks 20000
set_lk_max_lockers 20000
set_lk_max_objects 20000
As the default values are 1000 of each type of object, my applicaton open 499 database(except internal database) simultaneously(CDB modal) . After changed parameters, my application opend above 6000 database.

How many KVM can run in my mobile at a time

Say for an instance in a java enabled mobile i have 2 java applications running. I want to know whether each application shares the same KVM or seperate one.
To make it simple at one instance of time how many KVMs can run in my mobile

I think there's just one KVM involved, but have never met this scenario before. Maybe
you'll have to try some simple app. If you need to run one application from the other, see
http://forum.java.sun.com/thread.jspa?forumID=76&threadID=290808.
Peter

How many HACR can run in parallel in SAP BW 3.5 and 7.X?

Hi Experts,
I have a question that How many HACR/attribute change run can run in parallel in SAP BW 3.5 and 7.X?
I know in SAP BW 3.5 only one ACR job can run and if we start any will be failed due to lock issues. On other hand, I also noticed in SAP BW 7.3, there are more than one HACR job running in parallel without lock issue.
Does anybody know the reason behind this? how many ACR job we can run in parallel and precautions to be taken care everything.
Please share your thoughts and lets understanding the ACR in detail..
Thank you.
Bharath S

Hi Bharath,
I' am not sure but I' am sharing what I think
New version is always some betterment of old version. Time changes, advancements in technology, performance improves.
However, I want to ask "Can we run two HACs at a time which use same info object in 7.X ?"
Regards
Nikhil Guda

How many devices can run from one library?

How many Apple devices can be shared with one iTunes library? We have two iPhones, two iPod touches, two Nanos, and thinking about an iPad. Does Apple cut users off from using their own library (like with how they only authorize 5 computers)? Thanks so much.

As far as I'm aware there is no limit to the number of devices that you can sync to your library.
There is a limit (10) to the number of iOS devices or computers that can be authorized for automatic downloads of your purchases at any one time, along with the limit of 5 computers that can be simultaneously authorized for the playback and transfer of protected content.
tt2

How many databases can I create under Hyperion Planning

Dear all,
I'm new to Hyperion. I have a doubt on Hyperion planning. In our project we have only one database for every planning application. Can I create multiple databases? If yes, what is the maximum number of databases can I create?
If this post is not related to this category, please provide me the exact category so that I can post in the exact place.
Please help me ASAP.
Thank for all your help in advance.
Regards,
Raghuveer.

Hi,
You can create five databases in a planning application ( three custom,workforce and capex).
http://docs.oracle.com/cd/E17236_01/epm.1112/hp_admin/frameset.htm?app_dsc.html
For any queries related to Hyperion Planning you can post it in "Performance Management Applications" -> "Planning and Budgeting"
Cheers...!!

How many sessions can run simultaneously in oracle 10g database

Dear Experts,
Please tell me .
Thanks

Going into further details, if you are asking about number of concurrent sessions >that can access a block then it is defined by the INITRANS and MAXTRANS >parameters for the segment (which defaults to 2 for table segment, 1 for index >segment). There is more to say about that ITL slots: for Oracle 9i at least there can only be a maximum of 255 ITL slots whatever the data block size: for small block size, the maximum of ITL slots is about 50% of the data block size and and can be lower than 255.
See Metalink note:
Subject: INITRANS relationship with DB_BLOCK_SIZE.
Doc ID: Note:151473.1 Type: BULLETIN
Last Revision Date: 27-SEP-2006 Status: PUBLISHED
I don't know if this is still valid for Oracle 10g.

How many instance are running ?

Dear Friends ,
how do i figure out how many instance are running on database? OR , How many database are running in a server ? Is it possible to find out from 'os' or 'database' level ?
Waiting for ur kind reply ... ...
Edited by: shipon_97 on Sep 4, 2008 10:38 AM

Hi,
On unix/linux use: ps -fea|grep pmon
This will show all pmon process running (Each one is an Instance and you will see the name of the Instance here too), you can also check on /etc/oratab all the oracle databases in the server.
On Windows go to Control Panel, Administration, Services and take a look on the Oracle services.
Cheers,
Francisco Munoz Alvarez
www.oraclenz.com

How many databases

hi,
how do we find that how many databases are there on the server in windows and which how do we find how many databases are running.

Windows:
start->run->services.msc
Oracle databases on windows need to have the service of the form OracleService<SID>.
The number of such services you have under services.msc, it means that there are so many databases residing. For the databases that are running, you need to check if the OracleService<SID> is started or not.

How many threads can be running at the same time

Hi!!
Dows anyone knows how many Threads can be running at the same time in the JVM.
I'm making a multi thread client-server app and I would like to know how much simultneous connections the JVM support. I'm using one Thread per connection.

Hi, thanks to all for your answers.
I think that I made the wrong question, as you said: "that means the number of threads currently created".
I'm worry about this because my application is already online (It's a mail server -SMTP and POP3 server using ORACLE for the users database- ) and some other user post in the "multi-tread forum" that almost any JVM can only have 700 threads created at the same time, and I've never heard or read anything about this.
what you mean with the stack space (memory??)
I'm using the JavaWebServer 2.0 and a servlet to start the main Thread.
Again Thanks to all for the answers but I think that the schapel answer is the one that solve my doubt...

How many devices can i run lion on it?

how many devices can i run lion on it?

As far as licensing goes, it seems that as long as all the Macs are being used in your household, there's no limit.
From the Lion license file:
"If you obtained a license for the Apple Software from the Mac App Store, then subject to the terms and conditions of this License and as permitted by the Mac App Store Usage Rules set forth in the App Store Terms and Conditions (http://www.apple.com/legal/itunes/ww/) (“Usage Rules”), you are granted a limited, non-transferable, non-exclusive license:
i) to download, install, use and run for personal, non-commercial use, one (1) copy of the Apple Software directly on each Apple-branded computer running Mac OS X Snow Leopard or Mac OS X Snow Leopard Server (“Mac Computer”) that you own or control."

How many users can connect to a shared drive on a non-server workstation?

How many users can connect to a shared drive on a non-server workstation? We're waiting for our server to arrive and in the interum we're using a Pegasus 2 R6 attached to an iMac running Mavericks as our fileserver. It's been sketchy, the connection to the server being dropped once in a while or the inability to mount the drive after a week of success. The Pegasus we're using now will be attached to a server once it arrives. For now I need to figure what's coausing trouble before I commit to this being our main storage as planned. The data is backed up every night so I'm not worried, its the usability issues. 5-7 people are mounting this drive and opening/saving at the same time. Is there a limit to Maverick's fileserving ability that may be causing this? Understandable if so.

The file server in the client version of OS X has a default limit of 10 simultaneous connections. That limit can be raised by installing OS X Server, or lowered by setting a hidden preference. Assuming you've done neither, you may be able to solve the problem temporarily by stopping and restarting file sharing in the Sharing preference pane, or permanently by setting another hidden preference on the server to break idle connections quickly.
defaults write /Library/Preferences/com.apple.AppleFileServer idleDisconnectOnOff -bool YES
Stop and restart file sharing. To reverse the change, run this command in the same way:
defaults write /Library/Preferences/com.apple.AppleFileServer idleDisconnectOnOff -bool NO
Credit for this solution to ASC member suter:
this file server will not allow any additional users to log on

How many times can I run PSConfig.exe -cmd upgrad .... command

I'm getting VSS error in my eventlog -> application. I was getting 8213 and followed http://technet.microsoft.com/en-us/library/cc734219(v=ws.10).aspx and
now I'm gettting 8230.
Meanwhile my backups not are running. I remember running PSConfig command when I first installed windows and sharepoint 2010 on this box for system backup to work correctly.
Now I run WMIC QFE LIST FULL /Format:HTable > C:\Temp\HotfixList.html to retrieve all the installed update to check if KBs
2460045 or 2687453 are installed unnoticed but I don't have any history of installed updates suprising eh!
Now I want to run
PSConfig.exe -cmd upgrade -inplace b2b -force -cmd applicationcontent
-install -cmd installfeatures
just incase one of them have been installed unnotice.
How many times can I run this PSConfig command? How dangerous is this decision?

You can run it as many times as you want, but it will take SharePoint down on that particular server (resets IIS, for example), while it executes.
Trevor Seward
Follow or contact me at...
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This post is my own opinion and does not necessarily reflect the opinion or view of Microsoft, its employees, or other MVPs.

How many people can connect to the mail server 3

I am looking to grow my business which consist of a growing email base with emails that need to be set up and managed. How many emails can be hosted on the mac server?

Hello Thomas,
"MAXLOGMEMBERS" has nothing to do with the number of users that can connect to the instance. It is a parameter to control the number of files that can be assigned to a group of (redo) log files.
how many people can connect at Oracle XE?Well, that depends on how they connect. There are parameters controlling the number of sessions in the database. But if you have a technical user, e.g. when using APEX, there may be more users than sessions in the database...
So you need to clarify what kind of user access you mean.
-Udo
Edited by: Udo on 14.10.2011 15:19

Can I find out how many clients are connected to a server process?

Hi, I am hoping I can find out how many clients are connected to a server process. This could be either a programmatic lookout number, a number in a log file etc.
By the way, does lookout have any application (not data) logs? I have noticed that occasionally lookout will crash and I cannot find any logs to determine why, what processes were running, who last accessed it etc.
Thanks

Hello,
There's currently no way to acquire this data. I think that'd be a great suggestion for the product. Please submit your feedback to our developers at the following link: http://digital.ni.com/applications/psc.nsf/default?OpenForm&temp1=&node=
Best regards,
Yusuf C
Application Engineer
National Instruments

How many databases can run in a server

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