Design question related to database replication ...

Hi everybody,
I had a design and architecture question. Do you folks mind giving me some directions on it please ?
We have a huge J2EE application coming in related Airlines business. It will run on BEA 8.1 SP5 clusters, Iplanet web front ends, Mainframe database and Oracle database, MQ is also involved. Also uses JCA/Legacy vendor solutions from Neon and IWay (I have no clue what they are but will learn soon).
Now, i was involved in discussions where the Oracle database needs to be "replicated" onto another Oracle database box in case if the "live and connected" Oracle database goes down. Basically it is related to HA.
So, do you folks have any best practices guidlines which we can reference to better design this application ?
any help is greatly appreciated.

You should be able to link your objects using methods in your entities to create an object graph.
When you save your user the associated objects will also be persisted based on the cascade types that you have specified on the relationships between the entities.

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A design question related to generic dao pattern

I follow this link https://www.hibernate.org/328.html to design my DAO layer using jpa/ hibernate. And basically it works ok. However, I encounter a dilemma regarding to persistence relation between domain objects.
My classes include
User <--(many to many)--> Group
Tables are USERS, USERS_GROUPS, GROUPS
In User class, I have properties
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...Now in the database (mysql), I have already had two groups existing. They are
mysql> select * from GROUPS;
+----+------+
| ID | NAME |
+----+------+
| 1 | Root |
| 2 | User |
+----+------+and in the table USERS_GROUPS
mysql> select * from USERS_GROUPS;
+--------------------------------------+----------------+
| USER_ID | GROUP_ID |
+--------------------------------------+----------------+
| 1 | 1 |
| 1 | 2 |
+--------------------------------------+----------------+When I want to create a new user object and assig user object with an existing GROUP (e.g. GroupName.User)
At the moment the way how I implement it is done in the DAO layer (e.g. UserDaoImpl). (But what I want is to get this procedure done in the domain object layer i.e. User class, not DAO layer. )
steps:
1.) search the GROUP table (entityManager.cerateQuery(" from Group").getReulstList())
So it will return a list of all groups in GROUPS table.
2.) then check if the group (e.g GroupName.User) I want to assign to the User object existing in the GROUP table or not.
3.) if not existing, create a new Group and add it to a list; then User.setGroups(newList);
or
if the group (to be assigned to User class) already exists, use the group retrieved from the GROUP table and assign this group to the User class (e.g. groupList.add(groupFoundInGroupTable) User.setGroups(groupList))
However, what I want to do is to encapsulate this procedure into User calss. So that in DAO class whilst performing function createUser(), it would only need to do
User user = new User(....);
user.addGroup(GroupName.User); // GroupName is an enum in which it contains two values - Root, User
entityManager.merge(user);Unfortunately, because I need to obtaining Group collections from GROUP table first by using entityManager, which does not exist in the domain object (e.g. User class). So this road looks like blocked.
I am thinking about this issue, but at the moment there is no better solution popped upon my head.
Is there any chance that this procedure can be done more elegantly?
I appreciate any suggestion.
Edited by: shogun1234 on Oct 10, 2009 7:25 PM

You should be able to link your objects using methods in your entities to create an object graph.
When you save your user the associated objects will also be persisted based on the cascade types that you have specified on the relationships between the entities.

Design an uix page which is not related an database table

Hi;
I want to design a uix page, but this page elements is not related an database table, only pass through the parameter to run a report, how can i do this easly
Thanks

Such functionality is not generated/supported by JHeadstart. But you can build this page manually using JDeveloper. Please use the JDeveloper online help and/or the JDeveloper forum for help if you get stuck.
In monitoring this forum we have to set priorities, and we simply lack the resources to help you with questions not related to JHeadstart. I hope you understand this.
Steven Davelaar,
JHeadstart Team.

Design question for database connection in multithreaded socket-server

Dear community,
I am programming a multithreaded socket server. The server creates a new thread for each connection.
The threads and several objects witch are instanced by each thread have to access database-connectivity. Therefore I implemented factory class which administer database connection in a pool. At this point I have a design question.
How should I access the connections from the threads? There are two options:
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Thank you very much for your answer!
Kind regards,
Dak
Message was edited by:
dakger

So your suggestion is to use a static method from a
central class. But those static-methods are not realy
object oriented, are they?There's only one static method, and that's getInstance
If I use singleton pattern, I only create one
instance of the database pooling class in order to
cionfigure it (driver, access data to database and so
on). The threads use than a static method of this
class to get database connection?They use a static method to get the pool instance, getConnection is not static.
Kaj

Database Connection design question

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import java.sql.*;
import java.io.*;
import java.net.MalformedURLException;
import org.w3c.dom.Document;
import org.w3c.dom.*;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.xml.sax.SAXException;
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 String password;
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}Later on, I needed to do the same thing for MySQL, so I created a class for that, MySQLServerConnection which is exactly the same as above, except for:
private void getDBConnection(String user, String password, String dbName) throws java.sql.SQLException
 try
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 connection = DriverManager.getConnection(dbName, user, password);
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@nclow - I will work on trying the Factory Pattern for this over the weekend and post when I finish to see what you think.
@abillconsl - just to make sure I understand, you're saying that I just try to connect and it will cycle through the different database connection possibilities and connect when it finds the right one? If it fails all 3, log an appropriate message. One question I have about this is, I thought I was being object oriented by separating the different types of db connections (Oracle, SQL Server, MySql) into different classes. Am I missing the point of OOP by what I was/am trying to accomplish? Going overboard? Also, does your way try and connect to all 3 even if I connected to one already?
Thx, Grantarchy
Edited by: grantarchy on May 9, 2008 9:50 PM

Design Question for table - related columns

Hi,
I have some design question about table I am working on.
Here are the sample fields in the table,
process_begin_date
process_approved_by
process_signed_by
process_monitor
process_communication
the same way I have around 10 groups, for ex
other_begin_date
other_approved_by
other_signed_by
other_email
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Hi,
Number of columns should not be any issue, but, proper normalization may be better for your design and scalability. If you can explain what you are storing in this table, you might get help if you need to have more than 2 tables in this particular scenario.
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Salman

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I would like to know the answers for the following questions regarding SAP XI-context (if it possible with Yes/No and a short comment/explanation)
CAPACITY PLANNING GUIDELINES
a) Guidelines to size the server(s)?
b) Guidelines for sizing the over all environment for High-Availability
ARCHIVING CAPABILITIES
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A.Henke

two questions related to this:
1. Why Java is designed to only permit single
inheritence, any stories behind the scene? I think
some major reasons why "prefer interfaces toabstract
classes" is accepted is rooted in this limitation.Yes, one of the reasons interfaces are better is that
you can only extend one class, but implement many
interfaces. Say you have a concrete class that should
"implement" two different types. If those types were
defined as abstract classes, you could only use one
type. You could implement both types if they were
interfaces though. So why java is designed to have this limitation? There may be some arguments before this is settled down. I always like to hear this kind of stories:)
2. Base on the fact that once an interface is outof
box and widely implemented, it is almostimpossible
to change it. So how you guys design yourinterfaces?
Could you share some? In my idea, I would designmy
interfaces as compact as possible.You could extend the interface and start using that
if you didn't want to break existing code. You
couldn't use that implementation as an Interface1
though, since the new methods only exist in
Interface2, so that's not an optimal solution.So we may always need to add a new interface when we just want to add a new method.

LDAP design question for multiple sites

LDAP design question for multiple sites
I'm planning to implement the Sun Java System Directory Server 5.2 2005Q1 for replacing the NIS.
Currently we have 3 sites with different NIS domains.
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1. 3 LDAP servers + replica for each sites.
2. Single username and password for every end user cross those 3 sites.
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Thanks for your information.
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That'd my goal.
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Hi
I want to ask a question about imported database. I imported database and I noticed tables doesnt have Primary key or foreign key. They havent relation between eachs. Why can this occured ?
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yeah ı am surprised none of tables have pk or fk ..
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Hi All,
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I had tried implementing the JMS publisher/subscriber pattern before, unfortunately I experienced performance was not so good compared to the directly writing to the db adapter. I feel the organization SOA infrastructure is not setup correctly to cope with the number of messages coming through from external third party. Our current setup consists of three WebLogic Servers (Admin, SOA, BAM) all running on only 8GB physical RAM on one machine. Is there Oracle guideline for setting up infrastructure for a SOA application receiving roughly 600000 messages a day. I am using SOA 11.1.1.4. JMS publisher/subscriber pattern just does not cope and I see significant performance lag after few hours of running. The JMS server used was WebLogic JMS
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Edited by: user5108636 on Jun 13, 2011 7:03 PM

SCCM 2012 Database Replication Monitor Child Site Details Empty

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Thanks.
Amy

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Hi,
Why do we use this " In Update Task " ??
The main update technique for bundling database changes in a single
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All ACS SE were upgraded at the same time and display the same versions when examining the Appliance Upgrade page. Does anyone have any ideas what the problem is?
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Hi, I am having a related problem but in my case I am using ACS for Windows ver.4.0. I am replicating from one primary ACS to three other ACS using scheduled nightly replication.
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cheolhyeon

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thanks
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Design question related to database replication ...

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