Several handles to the same database in a single thread

I have a single-threaded program where several db handles are created with db_create() and they're all opened to the same database in the same file. The handles will be used serially, in quite random order for reads and writes, and each of them will be closed at the end of the program.
Do I need to take any steps to ensure the integrity of the database? I currently create the handles and open the databases with the default settings, if applicable.

Guys, I am still racking my brain. I have taken some screenshots to show you how I have my database tables set up. I was able to get the tables over to the InnoDB type so I can make foreign keys. Here is how I currently have them setup, can someone check this out and see if it's correct?
Table 1 (carinfo)
Table 2 (images)
Thanks

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Accessing the same database file using different handles/cursors

Will there be any problems accessing the same database file using different DB handles in a transactional environment? We have implemented a process which have multiple transient threads coming up and initiating DB opens and read/write operations to the same database file using different handles and cursors?
Can this potentially create any problems/bottlenecks? Can someone suggest the best way to deal with this scenario?
Thanks in advance.
SB

Hi,
Berkeley DB is well suited to the scenario you describe. You need to ensure that Berkeley DB is configured correctly for transactional access, the best information describing the requirements is in the Reference guide here:
http://download.oracle.com/docs/cd/E17076_02/html/programmer_reference/transapp.html
If there will be multiple threads operating concurrently, then you will need to design your application to detect and deal with deadlock situations.
Regards,
Alex Gorrod
Oracle Berkeley DB

How to share the same Database Connection when using several Task Flows ?

Hi All,
I’m using JDev 11.1.1.3.0.
I’m developing ADF Fusion Applications (ABC BC, ADF Faces…)
These applications are deployed on a Weblogic server.
Each application has only one Application Module.
All Application Modules have the same connection type defined: JDBC DataSource : jdbc/GCCDS
It is working fine.
I’ve also developed Task Flow Applications for small thinks that are reused in multiple main applications.
Each Task Flow Application has also one Application Module with the same connections type as main applications.
All these task flows are deployed to JAR file (ADF Library JAR File) and are reused on my main applications. (drag and drop from the Resource Palette to ADF Regions….).
There are some parameters passed to Task Flows, so that they can filter data depending on which main applications they are called from.
Everything is working perfectly.
All my main applications are using more and more task flows. Which is nice for the reusability etc…?
Only ONE PROBLEM: DATABASE CONNECTIONS.
Every Task Flows service made a database connection. So one user may have 10 database connections for the same adf page. And when there are 100 users that are working at the same time, it becomes a problem.
How to share the same database connections for the main applications and all task flows which are used in the main application?
Best Regards
Nicolas

Hi John,
When I open a ADF Library JAR file of one of my task flow. (gcc_tf_recentSites.jar)
I can see TF_RecentSitesService.xml and TF_RecentSitesServiceImpl.class in gcc_tf_recentSites.jar\mu\gcc\tf\recentSites\model\service folder
+ bc4j.xcfg in gcc_tf_recentSites.jar\mu\gcc\tf\recentSites\model\service\common folder.
bc4j.xcfg details are
+<?xml version = '1.0' encoding = 'UTF-8'?>+
+<BC4JConfig version="11.1" xmlns="http://xmlns.oracle.com/bc4j/configuration">+
+<AppModuleConfigBag ApplicationName="mu.gcc.tf.recentSites.model.service.TF_RecentSitesService">+
+<AppModuleConfig DeployPlatform="LOCAL" jbo.project="mu.gcc.tf.recentSites.model.TF_RecentSites_Model" name="TF_RecentSitesServiceLocal" ApplicationName="mu.gcc.tf.recentSites.model.service.TF_RecentSitesService">+
+<Security AppModuleJndiName="mu.gcc.tf.recentSites.model.service.TF_RecentSitesService"/>+
+<Custom JDBCDataSource="jdbc/GCCDS"/>+
+</AppModuleConfig>+
+<AppModuleConfig name="TF_RecentSitesServiceShared" ApplicationName="mu.gcc.tf.recentSites.model.service.TF_RecentSitesService" DeployPlatform="LOCAL" JDBCName="gccdev" jbo.project="mu.gcc.tf.recentSites.model.TF_RecentSites_Model">+
+<AM-Pooling jbo.ampool.maxpoolsize="1" jbo.ampool.isuseexclusive="false"/>+
+<Security AppModuleJndiName="mu.gcc.tf.recentSites.model.service.TF_RecentSitesService"/>+
+</AppModuleConfig>+
+</AppModuleConfigBag>+
+</BC4JConfig>+
So, it seems that the Application Module is packaged with the task flow....
Is it normal ?
Regards
Nicolas

How to create many user in the same database

hi
my question is "How to create many user in the same database(application)?"
for example, i have students, teachers, and staffs user using my application.
i can create many users to use the same application right?, how ^^''' ???
(right now i can only create application and then it shows every data in my DB
but i want it to show only the data for the user who login to that application)
Thanks.
ps. i'm newbie, please help T^T

You need to create a user table within your application that maintains their privileges. If you have LDAP you could use this for authorisation otherwise the table would handle that as well (store passwords etc). Your reports etc would then be filtered on information from this table.
Check out some of the sample applications to see how authorisation and access is implemented (Online store is one). The how-to on the issue tracking system should also have some useful pointers.
http://download-west.oracle.com/docs/cd/B31036_01/doc/appdev.22/b28839/issue_track.htm#BABBGBJG
cheers,
Ron

Multiple web-app sharing the same database.

hi experts,
If I have several websites running on the same server. Most of the are sub-domains of the same domain, they share the same database, but each sub-domain will have their own web-apps(This also means that they are running on a different java virtual machine, right? ). My question is that how can I make them communicate with each other. Also, will there be any conflict with the database insert/update issues, and How do I solve that?
For example, if one user is already logon from "tips.mydomain.com", then when the users goes to another sub-domain, say "java.mydomain.com", he/she doesn't need to re-login again.
thanks.

Well yes, having databases accessed by multiple users simultaneously is an issue that many many developers have had to face. But the answer to "How do I solve that" doesn't fit in this little box or in the limited time that people have available to answer questions here. It's an extremely complex issue about which entire books have been written.
As to the bit about the subdomains, it is possible to map them to the same web server, as far as I know, but that's a web configuration issue and nothing to do with Java programming.

Multi-processes on the same machine open the same database

I run into an issue where I have two processes, running on the same machine.
Process-1 starts the replication as master and opens database for read-write.
Process-2 only opens the same database for read-write, no replication is started,
and process-2 will fail to open the database because of "Non-replication DB_ENV
handle attempting to modify a replicated environment" error.
Can you suggest a way to handle this scenario?
Can two processes on the same machine open the same database for read-write?
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Following are how I setup the database environment for Master side:
DB_ENV->rep_set_priority(80)
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DB_ENV->repmgr_set_local_site()
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DB_ENV->set_data_dir()
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Both processes using the same environment home directory.
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The first process starts the replication server, and the second process will not start the replication server at all.
However, if the first process terminated and got restart, the replication server will not be restarted...
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Languare is critical since it is all we have to communicate with
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First, I am now running iTunes for windows, 11.1.3.8
My computer is a laptop running Windows 7.
I have an iPod classic that I try to sync with it.
I have a mix of songs downloaded from Amazon (sorry guys) or ripped from CD's.
A year ago, iTunes started creating several copies of the same track. For example, if I wanted to listen to Adam Ant, I'd have three copies of "Desperate, but not serious" and one copy of something else and two copies of "Room at the Top."
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Use my DeDuper script if you're not sure, don't want to do it by hand, or want to preserve ratings, play counts and playlist membership. See this thread for background. Please take note of the warning to backup your library before deduping, whether you do so by hand or using my script, in case something goes wrong.
(If you don't see the menu bar press ALT to show it temporarily or CTRL+B to keep it displayed)
tt2

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Hi,
I want to install two different instances of Oracle 10g in two different machines which will access the same database which will be stored in the shared storage.
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Two servers will be running Linux and clustered in Linux level.
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> The instances will be one active and the other passive, so the services will be up in one server and down in
the other and the switching (shutting down one server and starting up the other) will be manual
Missed this part as I was thinking proper cluster and RAC.
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rs.Fields(1) = (Text2.Text)
rs.Fields(2) = (Text13.Text)
rs.Fields(3) = (Text4.Text)
rs.Fields(4) = (Text5.Text)
rs.Fields(5) = (Text6.Text)
rs.Fields(6) = (Text7.Text)
rs.Fields(7) = (Text8.Text)
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What can I do to add fields from 2 different tables to different text boxes within the same form using a single ado control using vb6 and MS Access 2007??

Hi,
Since VB6 product is not supported in this forum, you may go to these forums for support:
#Where to post your VB 6 questions
http://social.msdn.microsoft.com/Forums/en-US/6a0719fe-14af-47f7-9f51-a8ea2b9c8d6b/where-to-post-your-vb-6-questions
Thank you for your understanding.
Best regards,
Franklin
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Greetings -
I'm looking for something that I may just be missing, and hoping someone here can point me in the right direction.
Basically, I'd like to be able to select an image in my library and export several versions at the same time. For example, I select a photo and export JPG, TIFF and PSD versions in one shot without having to run three separate export requests - essentially a batch action. I can't imagine that this isn't built in already - I'm just assuming that I'm missing something obvious.
Thanks in advance for any advice anyone might have.
John.

Fwiw, I've not seen this requested before.
This kind of Export option is very typical, Kirby, when the rendering of the exported version will take a long time, for example for video or audio. Then you can share several formats at once, to render a version suitable for the web, for viewing on the computer, or the iPhone at the same time. That is really useful, if you render a movie at a full HD resolution and don't have to do it again for an iPhone/iPod version.
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Can't you open more than one tab?
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I HAD THE SAME PROBLEM WITH SHARING MY LIBRARY WITH MY SON. WHAT I DID WIAS CREATED A LIBRARY FOR HIS USE ONLY. IN ITUNES CLICK--FILE--NEW PLAYLIST AND THIS SHOULD ADD AN UNTILED PLAY LIST IN YOUR SIDE BAR. CLICK ON IT AND RENAME IT. HE CAN KEEP ALL OF HIS MUSIC IN THIS LIBRARY. SELECT ALL OF HIS MUSIC FROM YOUR LIBRARY AND DRAG IT INTO HIS. ONCE THIS IS DONE YOU CAN THEN REMOVE HIS SONS FROM YOU PLAY LIST. MAKE SURE YOU ONE REMOVE IT FROM YOUR PLAY LIST AND NOT DELETE THE FILE.
HOPE THIS HELPS
G4 Mac OS X (10.3.9)

Several handles to the same database in a single thread

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