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Oracle News / Peer-to-Peer: "Dogged DBAs"
« on: March 29, 2010, 11:05:01 AM »
Peer-to-Peer: "Dogged DBAs"

Ben Prusinski, Sabdar Syed, Bert Scalzo

Dogged DBAs
By Blair Campbell
Meet three hardworking peers who dog-ear reference books and make doggy dedications.

Ben Prusinski
Peer Specs
Ben Prusinski and Associates, an Oracle consulting firm focused on end-to-end delivery of Oracle data warehouse and Oracle E-Business Suite solutions

Job title/description:
Managing partner and chief architect

San Diego, California

Oracle credentials:
Oracle Certified Professional (Oracle Database 10g), Oracle Certified Associate (Oracle Database 10g), and Oracle Certified Expert (Oracle Real Application Clusters 10g Administrator), with 13 years of experience using Oracle products

Oracle ACE
Which new features in Oracle Database are you finding most valuable?
I really like the Oracle Data Guard Snapshot Standby and Oracle Real Application Testing features. They allow me to work with customers to test upgrades and perform load testing without impacting performance on the current production database server.

You’ve taken Oracle University classes in the past. What led you to do this?
After I was laid off by a past employer in 2002 due to a major restructuring, I used some of my severance money to take Oracle9i DBA training courses. It was a great investment that helped keep my knowledge up-to-date.

If you were going to the International Space Station for six months and could take only one Oracle reference book, what would it be?
There’s a tie for the most dog-eared book on my DBA bookshelf between Oracle Database 10g Performance Tuning Tips & Techniques, by Rich Niemiec [Oracle Press, 2007], and Oracle Database 10g RMAN Backup & Recovery, by Matthew Hart and Robert G. Freeman [Oracle Press 2006]. I would take both.

Sabdar Syed
Peer Specs
Saudi Hollandi Bank, the oldest bank in Saudi Arabia

Job title/description:
Senior Oracle DBA

Riyadh, Saudi Arabia

Oracle credentials:
Oracle Certified Professional (Oracle8i Database, Oracle9i Database, Oracle Database 10g, and Oracle E-Business Suite 11i Applications) and Oracle Certified Expert (Oracle Real Application Clusters 10g Administrator), with 8 years of experience using Oracle products

Oracle ACE
How did you get started in IT?
After earning my computer science degree, I got a job at [Oracle Database support services provider] Oramasters in India. My team was led by Rama Velpuri, who was a director at Oracle for many years and is considered a guru in backup and recovery. At Oramasters, Velpuri’s team needed a junior DBA to test the scenarios and scripts they prepared for backup and recovery, so that’s where my focus on that area began.

What’s your favorite tool or technique on the job?
My all-time favorite tool is SQL*Plus, because it’s so easy to use for defining and developing SQL and PL/SQL scripts and for controlling the database structure.

What advice do you have for getting into database development?
Working knowledge of Linux is always a value add. I recommend that new DBAs download Oracle’s free trial version, Oracle Enterprise Linux, and start practicing.

Bert Scalzo
Peer Specs
Quest Software, a systems management firm

Job title/description:
Database expert and product architect

Flower Mound, Texas

Length of time using Oracle products:
25 years

Oracle ACE
What technology has most changed your life?
Virtualization. It makes jobs like mine—where you need multiple server operating systems [OSs] and versions, multiple client OSs and versions, and multiple database versions across multiple OSs per version—doable. I can now have four servers that cover all my needs. Virtualization also helps me be green: rather than running one dedicated server per platform, I can instead run one server-class box and boot the OSs that I need—even concurrently. So I’ve cut my power and heat footprint by at least half.

Which new options and features in Oracle Database are you finding most valuable?
I find both Oracle Real Application Clusters [Oracle RAC] and Oracle Automatic Storage Management technologies truly intriguing. I help many people do Oracle RAC proof-of-concept projects—and when people are well educated and prepared, Oracle RAC simply works wonders. Plus I’m curious about just how it will evolve and be used in the virtualized world.

What’s your favorite thing to do that doesn’t involve work?
Hanging out with my miniature Schnauzer, Max. I’ve managed to involve Max and my other dogs in my work life, too: I’ve written seven books, and all but one are dedicated to my dogs.

Oracle News / Browser-Based: "Advanced Interactive Reporting"
« on: March 25, 2010, 12:05:03 PM »
Browser-Based: "Advanced Interactive Reporting"

Extend interactive reports with Oracle Application Express.

Oracle Application Express has included interactive reporting capabilities since Release 3.1. With interactive reporting, end users can modify their own data layouts directly in the Web application. Each user can rearrange a report’s data and save multiple layouts for later reference without having an impact on other users.

A previous column, "Building Interactive Reports" (Oracle Magazine, March/April 2008), explains how to build these reports. This column will take you through some of the more advanced techniques you can employ with Oracle Application Express interactive reports.

PSOUG / Oracle/Sun Enforces Pay-For-Security-Updates Plan
« on: March 23, 2010, 11:59:56 AM »
Oracle/Sun Enforces Pay-For-Security-Updates Plan

Recently, the Oracle/Sun conglomerate has denied public download access to all service packs for Solaris unless you have a support contract.

Now, paying a premium for gold-class service is nothing new in the industry, but withholding critical security updates smacks of extortion. While this pay-for-play model may be de rigueur for enterprise database systems, it is certainly not the norm for OS manufactures.

What may be more interesting is how Oracle/Sun is able to sidestep GNU licensing requirements since several of the Solaris cluster packs contain patches to GNU utilities and applications.

ADF Desktop Integration Component and Feature Demo

ADF and Excel working together

Oracle News / Up Close: "Filling the Needs of Higher Education"
« on: March 22, 2010, 12:05:02 PM »
Up Close: "Filling the Needs of Higher Education"

Ted Simpson, vice president of communications for the Higher Education
User Group (HEUG), shares his thoughts on IT and higher education.

Oracle News / HEUG's VP of Communications Ted Simpson
« on: March 22, 2010, 12:05:02 PM »
HEUG's VP of Communications Ted Simpson

HEUG's VP of Communications Ted Simpson in Oracle Magazine Up Close

Oracle News / Partitions: "Partition Virtually"
« on: March 22, 2010, 12:05:02 PM »
Partitions: "Partition Virtually"

Save space by deactivating index partitions, and use virtual columns to
partition more logically.

Oracle News / OTN Bulletin: "Best Reads of 2009"
« on: March 22, 2010, 12:05:02 PM »
OTN Bulletin: "Best Reads of 2009"

Learn what's happening with Oracle's most dynamic online community.

Oracle News / Architect: "Making Architecture Success Visible"
« on: March 22, 2010, 12:05:01 PM »
Architect: "Making Architecture Success Visible"

Make architecture success visible.

PSOUG / Oracle Shuttering OpenSSO
« on: March 19, 2010, 07:12:28 PM »
Oracle Shuttering OpenSSO

OpenSSO is one of the best open source web Single Sign On projects out there. Sun Microsystems made OpenSSO open source in 2008, so it's sad to see how, after absorbing Sun, Oracle is shutting down this amazing project, labeling it 'not strategic' and dismembering the few parts they think are worthwhile for their own SSO effort.

They started by freezing the next express release, and during the last few weeks they have been removing all the open source downloads from the OpenSSO website and removing content from the wiki.

Fortunately, a Norwegian company called ForgeRock has stepped up to the plate in an attempt to salvage the project under the new name OpenAM.

Tech Article: Oracle Essbase Studio Deep-Dive

Dive into a step-by-step tutorial that reflects real-world data warehousing complexities.

PSOUG / Oracle To Sun Users: Put Away The Red Pen
« on: March 12, 2010, 07:30:23 AM »
Oracle To Sun Users: Put Away The Red Pen

Oracle made a plea to Sun Microsystems’ UK customers to “put away their red pen” and trust Oracle will continue to support develop Sun’s products following approval of its $7.4 billion (£4.9bn) acquisition of the company.

The company promised to continue to develop Sun’s SPARC and x86 servers, as well as the Solaris operating system, tuning them to support Oracle better, while still keeping them “open” and competitive as “best of breed” general purpose systems. Other Sun products also got a promise of continued life, although there was little or no mention of the open source MySQL database.

The acquisition produced a “truly unique” combination of hardware and software, “from application to disk,” the UK country leader at Oracle David Callaghan told 500 Sun customers and partners in London. Britain is the first country in Europe where the much-delayed acquisition has been approved.

“This will change the way you look at your IT infrastructure,” said Dermot O’Kelly, vice president of systems for EMEA at Oracle - a new position which he said makes him Oracle’s “first ever SVP for hardware”.

Full Story:

Oracle JDeveloper Forum / ADF Insider -SOA and ADF Integration
« on: March 09, 2010, 06:05:02 PM »
ADF Insider -SOA and ADF Integration

Recorded  technical seminar

Tech Article: Joining Oracle Complex Event Processing and J2ME to React to Location and Positioning Events

How to join the power of the Location API for J2ME (JSR 179) with Oracle Complex Event Processing to deliver business applications that can't be built without an event processing tool.

Joining Oracle Complex Event Processing and J2ME to React to Location and Positioning Events         
How to join the power of the Location API for J2ME (JSR 179) with Oracle Complex Event Processing to deliver business applications that can't be built without an event processing tool.
By Daniel Amadei
Published March 2010
Real-time processing of data is becoming more important every day. The speed of changes in all kinds of market segments is increasing more than ever. Conversely, the time for reaction is getting shorter. This article shows how the concept of complex event processing (CEP) can help us address these challenges—CEP helps analyze events and recognize patterns in the cloud of information, making it possible to react to events as soon as they happen.
This article illustrates what can be achieved with CEP and event-driven architecture. Familiarity with Oracle Complex Event Processing is not assumed or required.
Use Cases
JSR 179 is the Location API for J2ME. From its name, you can figure out that this JSR deals with location and positioning of devices by use of their embedded GPS.
Knowing what can be achieved with JSR 179, I present two very similar use cases based on interesting business scenarios that can be delivered with CEP:
  • Average Speed. This CEP application shows a business use case with aggregation of data. This aggregation is the average speed of a user sent by the mobile device every two minutes. If the user is stuck in traffic, a new event will be generated, which might result in a Short Message Service (SMS) message telling that person how to get out of the traffic or what radio station to tune in for traffic reports.
  • AreaOfInterest. This CEP application is very similar to the preceding one. It gets events from the equipment (a mobile phone with GPS, in my case—but it could be anything compatible with the JSR) and analyzes whether the location sent is next to or in an area of interest. If it is, another event will be generated that can send an SMS message informing the customer about some kind of event in that vicinity. For this example, the location is Ibirapuera Park in SÃo Paulo, Brazil.
Technical Overview
For the example, we have a Java 2 Platform, Micro Edition (J2ME) application based on the official JSR 179 example . The mobile application collects the location information (latitude, longitude, and speed) and the phone's International Mobile Equipment Identity (IMEI) to be able to send an SMS message to the phone later and post this data to a socket, using a DataOutputStream.
Both CEP applications receive the location from the mobile device as a socket message. In the example, receive is achieved by a single thread. That would not be the case for production applications, for which you should consider better approaches such as using pooled threads or nonblocking I/O (NIO) to receive several messages at the same time. Also, the event generated when the desired behavior is recognized by CEP is simply printed to the console to keep the example simple. In a real-world application, you would probably send an SMS message to the user or do something similar.
Deep Dive: CEPMobileApp
The CEP mobile application (CEPMobileApp) receives notifications about changes in the location of the device and uses a wait/notify mechanism to update the device screen and send events to Oracle Complex Event Processing about the location and speed of the device.
Location information is obtained as an instance of javax.microedition.location.Location. This class has a getSpeed() method, which returns the current device speed in meters per second. Another method of interest is getQualifiedCoordinates(), which returns an object of type javax.microedition.location.QualifiedCoordinates, which is responsible for providing the current latitude and longitude. The code is similar to the following (assume that l is an instance of location):
QualifiedCoordinates qc = l.getQualifiedCoordinates();
double latitude = qc.getLatitude();
double longitude = qc.getLongitude();
double speed = l.getSpeed();
The phone's IMEI is obtained through a System.getProperty() call. Because J2ME works on other types of devices besides mobile phones, there is no standardized way to get this info. For my Nokia e71 device, the following works fine:String imei = System.getProperty("");
Finally, we create a user for the Oracle Data Integrator work schema. For some of the data validation and transformation operations, Oracle Data Integrator needs to create (temporary) work objects. It is best practice to have these objects in a separate schema to avoid confusion between data warehouse objects and the temporary work objects.String imei = System.getProperty("");The final step is to send the event to Oracle Complex Event Processing, which is done with a socket. The code below shows how this is accomplished: private void sendLocationToCep(double latitude, double longitude,
   double speed, String imei) throws Exception {

   StreamConnection connection = null;
   DataOutputStream dos = null;

   try {
   connection =
       "socket://" + SOCKET_ADDRESS);
   dos = connection.openDataOutputStream();

   } finally {
If you look carefully at the code, you'll see some interesting things:
  • The socket address is specified externally. Actually, it's part of the Java Application Descriptor (JAD) deployment descriptor and read by the MIDlet class ( with the getAppProperty() method.
  • Data is written to the server as raw bytes. This minimizes the bandwidth consumed by the application, because few bytes are written for each event. For a real-world application, the best you can do is create some kind of protocol to avoid receiving inconsistent data.
  • The socket is closed after every transmission. I've kept it this way to make things simple. If you are developing for a real-world system, consider some kind of keep-alive to avoid the overhead of opening and closing the connection, especially in a resource-constrained device.
Average Speed
As already mentioned, the Average Speed application recognizes patterns that may indicate that the user is stuck in traffic and send an SMS message to that person, suggesting alternative routes, a radio station with traffic reports, or something similar. Actually, as already mentioned, the event sink in the example is simply a mock implementation that prints the IMEI and the average speed to the standard out, but you are free to implement your own logic.
Figure 1 shows the event processing network (EPN) of the Average Speed application.

Figure 1: Average Speed event processing network

Analyzing the EPN, we see what happens when an event gets inside Oracle Complex Event Processing. The first node of the EPN, called locationReceiverAdapter and represented by, is the one responsible for receiving the event. [[Stet original sentence if the part between the commas refers to the event rather than the node.]] This class is registered inside the application as a thread, as you can see here:
public class LocationReceiverAdapter
implements RunnableBean, StreamSource {
    //source code omitted
The StreamSource is an interface that forces this class to have a setEventSender() method to receive an instance of com.bea.wlevs.ede.api.StreamSender. This object received is later used to send an event through the EPN. The RunnableBean is an Oracle Complex Event Processing interface that extends java.lang.Runnable, the traditional threading interface, and the SuspendableBean interface is another one from the CEP API, forcing the class to implement a method that enables it to be notified when the bean should be suspended by the CEP server infrastructure. We use this feature to stop the thread and close the server socket, so that when the application is started again, the TCP/IP address and port will be available.
As an ordinary thread, this class has a run() method implemented, and the thread is started automatically by the server infrastructure—you do not need to call start() on this thread. Oracle Complex Event Processing will do that for you. The following is the run() method source code:
1.public void run() {
2. try {
3.  serverSocket = new ServerSocket(5555, 0, InetAddress
4.   .getByName("localhost"));

5.  suspended = false;

6.  while (!isSuspended()) {
7.   Socket socket = null;
8.   DataInputStream dis = null;

9.    try {
10.   socket = serverSocket.accept();
11.   dis = new DataInputStream(socket.getInputStream());

12.   double latitude = dis.readDouble();
13.   double longitude = dis.readDouble();
14.   double speed = dis.readDouble();

15.   byte[] imeiBytes = new byte[15];

17.   String imei = new String(imeiBytes);

18.   System.out.println("Received: " + latitude + ", " + longitude + ", "
19.     + speed + ", " + imei);

20.   generateEvent(latitude, longitude, speed, new String(imeiBytes));

21.    } catch (Exception e) {
22.   System.out.println("Problems reading socket: " + e);

23.    } finally {
24.   close(dis);
25.   close(socket);
26.    }
27.   }
28.  } catch (Exception e) {
29.   e.printStackTrace();
30.  } finally {
31.   close();
32.  }
33. }
Let's analyze it line by line. On lines 3 and 4, the server socket is created, and on line 10, this socket keeps waiting to receive a connection. As already mentioned, this is not the best option for receiving many simultaneous connections and was used just to keep the example simple. On line 6, a loop is started that checks to see if the bean was suspended or not. If not, a new iteration of the loop will be executed. On line 11, a is created, so the socket bytes can be read as datatypes. From line 12 to line 17, data is read, and on line 20, we use the received data to call the generateEvent method, which is responsible for sending the event. The source of the generateEvent method is shown here:1. private void generateEvent(double latitude, double longitude, double speed,
2.   String imei) {
3.  LocationEvent event = new LocationEvent(latitude, longitude,
4.    getSpeedInKmPerHour(speed), imei);
5.  eventSender.sendInsertEvent(event);
6. }
You can see that the code is extremely simple. A JavaBean is created, represented by the class LocationEvent, and the event is sent by the eventSender object, which was injected by the CEP infrastructure.
After raw data is received and the event is generated, the event is sent to a channel. The channel's responsibility is to receive and normalize the event. The channel is materialized as an XML declaration inside the application configuration file, as shown here:
<wlevs:channel id="locationInputChannel" event-type="LocationEvent">
<wlevs:listener ref="speedingProcessor" />
<wlevs:source ref="locationReceiverAdapter" />
The channel is connected to a processor, the speedingProcessor, which is responsible for processing the event and recognizing patterns within the cloud of events. The processor is declared as a simple XML element inside the configuration file:<wlevs:processor id="speedingProcessor" />
Besides that, the processor executes queries against the events, so it's capable of recognizing the patterns, based on what is specified by the queries. These queries obey the Continuous Query Language (CQL) syntax and are declared in the processor configuration file:<n1:config xmlns:n1=""
  <query id="averageSpeedingRule">
      select imei, avg(speed) as averageSpeed
      from locationInputChannel [range 2 minutes slide 2 minutes]
      group by imei
      having avg(speed) <= 20
The CQL is very powerful. You can execute complex queries against the events, using SQL-like syntax along with native support for XML, regular expressions, aggregation, subqueries (views), and definition of custom functions written in Java—among a lot of other features. If you intend to learn Oracle Complex Event Processing for real, get a deep understanding of CQL!
Analyzing the CQL query of our example,
select imei, avg(speed) as averageSpeed
from locationInputChannel [range 2 minutes slide 2 minutes]
group by imei
having avg(speed) <= 20
we see that it's a SELECT clause that groups events by IMEI and select those with an average less than or equal to 20 kilometers per hour. The last two minutes of data is considered, using the range operator. Along with that, we use the slide operator to slide the data window analyzed and get results output every 2 minutes.
If CEP recognizes an IMEI with an average speed of less than 20 kilometers per hour in the last two minutes, an event will be generated by the processor. The generated event is a MessageEvent, represented by the class. The channel configured to be the output channel for the processor defines the event type generated. The data used to populate such an event is defined by the SELECT clause. In our case, this is the messageOutputChannel, whose XML declaration is shown here:
<wlevs:channel id="messageOutputChannel" event-type="MessageEvent"
  <bean class="" />
<wlevs:source ref="speedingProcessor" />
After passing through the channel, the event is sent to the configured event sink, which is a simple JavaBean where you can place any logic you want. For the sake of the example's simplicity, I just print a message to the console, but you could change this code to send an SMS message. The event sink for this example is the MessageSender component and is implemented by the class, shown here:import com.bea.wlevs.ede.api.StreamSink;

public class MessageSenderBean implements StreamSink {

public void onInsertEvent(Object event) {
if (event instanceof MessageEvent) {
  MessageEvent messageEvent = (MessageEvent) event;
  System.out.println("=====> Found a Customer stuck in traffic. IMEI: "
    + messageEvent.getImei() + " - Average Speed: "
    + messageEvent.getAverageSpeed());
As you can see in this example, Oracle Complex Event Processing delivers a lot of power that enables you to analyze incoming events and search for patterns. It also enables you to think of new business paradigms that previously seemed impossible. Along with that, Oracle Complex Event Processing enables you to analyze thousands of events per second with minimal overhead by using the Oracle JRockit Real Time Java Virtual Machine (JVM), which delivers predictable garbage collection pause times, enabling you to consider very small time frames for the patterns without losing events due to GC execution.
The next example illustrates a similar use case, leveraging the same mobile application but delivering more business features. From a technical perspective, you will see how to define a custom Java function to be used inside your CQL query.
The AreaOfInterest application is very similar to Average Speed. The major difference is that we will not work with aggregation of event data; instead, we will inspect each incoming event to see if the user is near or in an area of interest and, if so, we will react to this scenario.
Accomplishing the verification of proximity to an area of interest involves calculating the distance between the coordinate points of the user, sent by the GPS device, and the coordinates of interest. This example takes into consideration the distance as the crow flies from point A to point B. This distance is calculated with a custom function registered from the Java class. I found the code for the distance calculation on the Web site and just changed it to return the distance in kilometers, not miles, per hour.
The coordinates for the area of interest are hard-coded into the Distance class. For a real-world application, you'd probably get a list of coordinates from a cache provider (Coherence, for example) or from the database. I decided to keep things this way to reduce the example's complexity.
Let's take a look at the AreaOfInterest application EPN in Figure 2.

Figure 2: reaOfInterest event processing network
As you can see, the EPN is very similar to the one you saw before, except that it has an extra bean declaration, represented by the Distance node.
Because of the similarity of the two examples, I'll focus on the only difference: the areaOfInterestProcessor processor. The declaration of this processor is as follows:
<wlevs:processor id="areaOfInterestProcessor">
<wlevs:function function-name="distanceToAreaOfInterestInKm"
  <bean class="" />
The function element declares a function named by the function-name attribute. The method executed is specified by the exec-method, which must be a method of the class specified in the nested bean declaration. In our case, we declare a CQL function, distanceToAreaOfInterestInKm, which internally executes the method.
The Distance class is shown here:
public class Distance {
private static final double LATITUDE_OF_INTEREST = -23.589823955777362;
private static final double LONGITUDE_OF_INTEREST = -46.662063002586365;

public static double distanceToAreaOfInterestInKm(double latitude,
  double longitude) {
return distanceInKm(latitude, longitude, LATITUDE_OF_INTEREST,

public static double distanceInKm(double latA, double longA, double latB,
  double longB) {

double theDistance = (Math.sin(Math.toRadians(latA))
   * Math.sin(Math.toRadians(latB)) + Math.cos(Math.toRadians(latA))
   * Math.cos(Math.toRadians(latB))
   * Math.cos(Math.toRadians(longA - longB)));

return (((Math.toDegrees(Math.acos(theDistance))) * 69.09) * 1.609344);
The next point is the CQL query we execute:  <processor>
  <view id="DistanceCalculatedView" schema="imei distance">
    select imei, distanceToAreaOfInterestInKm(latitude, longitude) as distance
    from positioningInputChannel [Now]

  <query id="ProximityRule">
      select * from
     where distance <= 1.5
The first interesting aspect you may have noticed is the absence of aggregation. Another nice thing is that a view is being used. Views act as subqueries for CQL clauses. The use of DistanceCalculatedView helps us avoid calling the distanceToAreaOfInterestInKm function twice; it would have to be specified in the SELECT and WHERE clauses if no view were used. The schema element specifies which elements are exposed by the view.
The ProximityRule query acts over the DistanceCalculatedView view to select only the events whose distance is less than 1.5 kilometers from Ibirapuera Park. Because the view does the distance calculation, the query just selects the view records whose distance attribute is less than 1.5 kilometers.
After that, a new event is generated, getting to the MessageSenderBean , and is printed to the standard output, as shown below:
.println("=====> Found a Customer next to an Area Of Interest. IMEI: "
   + messageEvent.getImei()
   + " - Distance: "
   + messageEvent.getDistance());
Installing and Running the Sample Applications
The two Oracle Complex Event Processing projects and the J2ME application are available for download here. After setting up your local environment with an Oracle Complex Event Processing server, Eclipse plus Oracle Complex Event Processing plug-in, and NetBeans, you can import the projects into each IDE and deploy them . to the server.
After importing the CEPMobileApp project into NetBeans, right-click the project -> Properties -> Application Descriptor, which gets you to the screen shown in Figure 3.

Figure 3: J2ME application descriptor properties
On this screen, you can specify a custom property value for Socket-Address property. This will be used by the J2ME application to know where to connect and send data. This address will probably be the address of your IP exposed to the internet. If you are inside some kind of LAN, it may be necessary to use port forwarding or something similar to forward requests from the Web to your local computer where Oracle Complex Event Processing is running.
After that, build the project and install CEPMobileApp.jar in your cell phone or run your application by using the J2ME emulator.

You may have liked the examples from a technical perspective, but if you look at the business appeal of both examples, you will realize that the use of events enables you to deliver solutions that seemed impossible before. Given that Oracle Complex Event Processing is made to scale, you will be able to use them to handle thousands of concurrent requests if you make some small adjustments to the examples.
Going further, think about other use cases in which this kind of solution can be applied, and you will see where the concept of complex event processing can take you.

Daniel Amadei is a principal consultant for Oracle Consulting in Brazil, specializing in SOA and integration technologies. He has been working with SOA for the last years and Java technologies since 1999. Among other certifications, he is certified as an Oracle SOA Architect Certified Expert and Sun Certified Enterprise Architect (SCEA).

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