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  • IDirect3DDevice9Ex and D3DPOOL_MANAGED?

    - by bluescrn
    So I wanted to switch to IDirect3DDevice9Ex, purely for the SetFrameLatency function, as fullscreen vsynced D3D seemed to produce noticable input lag. But then it tells me 'ha ha ha! now you can't use D3DPOOL_MANAGED!': Direct3D9: (ERROR) :D3DPOOL_MANAGED is not valid with IDirect3DDevice9Ex Is this really as unpleasant as it looks (when you're relying quite heavily on managed resources) - or is there a simple solution? If it really does mean manual management of everything (reloading all static textures, VBs, and IBs on a device reset), is it worth the hassle, will IDirect3DDevice9Ex bring enough benefit to make it worth writing a new resource manager? Starting to think I must be doing something wrong, due to this: Direct3D9: (ERROR) :Lock is not supported for textures allocated with POOL_DEFAULT unless they are marked D3DUSAGE_DYNAMIC. So if I put my (static) textures in POOL_DEFAULT, they need flagging as D3DUSAGE_DYNAMIC, just because I lock them once to load the data in?

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  • New Procurement Report for Transportation Sourcing

    - by John Murphy
    Welcome to our fourth annual transportation procurement benchmark report. American Shipper, in partnership with the Council of Supply Chain Management Professionals (CSCMP) and the Retail Industry Leaders Association (RILA), surveyed roughly 275 transportation buyers and sellers on procurement practices, processes, technologies and results. Some key findings: • Manual, spreadsheet-based procurement processes remain the most prevalent among transportation buyers, with 42 percent of the total • Another 25 percent of respondents use a hybrid platform, which presumably means these buyers are using spreadsheets for at least one mode and/or geography • Only 23 percent of buyers are using a completely systems-based approach of some kind • Shippers were in a holding pattern with regards to investment in procurement systems the past year • Roughly three-quarters of survey respondents report that transportation spend has increased in 2012, although the pace has declined slightly from last year’s increases • Nearly every survey respondent purchases multiple modes of transportation • The number of respondents with plans to address technology to support the procurement process has increased in 2012. About one quarter of respondents who do not have a system report they have a budget for this investment in the next two years.

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  • Cloud Integration White Paper - Now Available

    - by Bruce Tierney
    Interested in expanding your existing application infrastructure to integrate with cloud applications?  Download the new Oracle White Paper "Cloud Integration - A Comprehensive Solution" to learn not just about connectivity but the other key aspects of successful cloud integration. The paper includes three technical examples of cloud integration with Oracle Fusion Applications, Saleforce, and Workday and follows with the importance of taking a comprehensive approach to also include service aggregation, service virtualization, cloud security considerations and the benefit of maintaining a unified approach to monitoring and management despite an increasingly distributed hybrid infrastructure. To keep the integration architecture from being defined "accidentally" as new business units subscribe to additional cloud vendors outside the participation of IT, a discussion on the "Accidental SOA Cloud Architecture" is included: As shown in the table of contents below, the white paper provides a combination of high-level awareness about key considerations as well as a technical deep dive of the steps needed for cloud integration connectivity: Hope you find the White Paper valuable.  Please download from the following link

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  • MySQL for Beginners course - first steps to lowering your Database TCOs

    - by Antoinette O'Sullivan
    Thinking about lowering your Database TCO by using the MySQL Server? Don't miss the chance to get training from the source! With the newly released MySQL for Beginners class, learn how this powerful relational database management system can make your life easier and more fun! This course covers all the basics and will get you on your way, with a solid foundation. This instructor led, hands-on class covers the fundamentals of SQL and relational databases, using MySQL as a teaching tool. Send information about this course release to a friend who might be considering getting started on the world's most popular small footprint database.

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  • YouTube Video: EPM Channel

    - by p.anda
    In the past we have mentioned one of the available videos on the YouTube channel.  Did you know several more are available!  These short videos are provided via the Enterprise Performance Management (EPM) Information Development team. Oracle EPM Channel The available videos cover various products and topics and some of interest include: Resolving Certification Issues for EPM System Products Choosing a Deployment Path for Your Oracle EPM System Installation (11.1.2.2) Using OTN Documentation to Deploy EPM Products (11.1.2.2) Oracle HFCM - Account Reconciliation Manager module (11.1.2.2) Project Financial Planning - New Projects Feature (11.1.2.2) Introduction to ERP Integrator (11.1.2.2) Calculation Manager - Debug Feature (11.1.2.2)  Ensure to Subscribe to the "Oracle EPM Webcast" channel to keep up to-date with any new videos when they are released for EPM System products and modules.

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  • Ubuntu 12.04, web cam light flashing

    - by user205877
    Have been running Ubuntu on my Compaq C757 reliably since 9.10. Currently running a fresh install of 12.04 LTS. Somewhere during my regular updates, my webcam started flashing its power light. Light flashes from logon screen all throughout my session. I am not running Google Chrome but chromium and firefox. Webcam works normally whenever I run Cheese webcam booth, light comes on solid and webcam works normally. I close out of Cheese, webcam shuts off, and then the light starts blinking again. My system is dual boot, when I boot into Windows 7, webcam does not exhibit this problem. I suspect issue may be related to new laptop power management settings in kernel based on research on the web of similar problems, but I do not know how to instruct it to treat webcam differently.

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  • SQL Auto Close Options

    - by Dave Noderer
    Found an interesting thing that others have run across but it is the first time I’ve seen it. A customer emailed to say that the SQL 2008 db that I had helped him with seemed to be going into recovery mode on a regular basis while watching the SQL Management Studio screen. Needless to say he was a bit nervous and about to take some drastic steps. Eventually he found that the Auto Close option was set to true. When this is set to true, the database automatically closes all connections and unlocks the mdf file after 300 milliseconds. When a new connection is made it spins backup… Great for xcopy deployment on a client machine but not a multi-user server based application. So the warning… if you have started a database with SQL express and then move it to a production SQL server, make sure you check that the Auto Close option is set to false. See options screen below:

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  • SOA Suite 11g Developers Cookbook Published

    - by Antony Reynolds
    SOA Suite 11g Developers Cookbook Available Just realized that I failed to mention that Matt & mine’s most recent book, the SOA Suite 11g Developers Cookbook was published over Christmas last year! In some ways this was an easier book to write than the Developers Guide, the hard bit was deciding what recipes to include.  Once we had decided that the writing of the book was pretty straight forward. The book focuses on areas that we felt we had neglected in the Developers Guide, and so there is more about Java integration and OSB, both of which we see a lot of questions about when working with customers. Amazon has a couple of reviews. Table of Contents Chapter 1: Building an SOA Suite ClusterChapter 2: Using the Metadata Service to Share XML ArtifactsChapter 3: Working with TransactionsChapter 4: Mapping DataChapter 5: Composite Messaging PatternsChapter 6: OSB Messaging PatternsChapter 7: Integrating OSB with JSONChapter 8: Compressed File Adapter PatternsChapter 9: Integrating Java with SOA SuiteChapter 10: Securing Composites and Calling Secure Web ServicesChapter 11: Configuring the Identity ServiceChapter 12: Configuring OSB to Use Foreign JMS QueuesChapter 13: Monitoring and Management

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  • Any board-like platform but only for files instead of text posts? [on hold]

    - by Janwillhaus
    I am looking for a (best open-source or free but also commercially available) CMS platform that is built similarly to bulletin boards (for example phpBB) but instead of text posts, registered users can upload files that can be rated, commented etc.) I am aware of the number of board CMSes that have file-database plugins, but that is not what I want. I want to have a system that focuses on the files rather than on the postings. Or do you have any alternative ideas on solutions to the problem? I need the following functions CMS focused on file management Files that can be categorized (in a tree-like view for example) Comments and ratings can be added to files Users that can be provided various rights around the platform (moderation, commenting, exclusion of non-registered users, etc.) Users can upload files themselves (for further moderation

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  • SharePoint 2010 Diagnostic Studio Remote Diag

    - by juanlarios
    I have had some time this week to try out some tools that I have been meaning to try out. This week I am trying out the SP 2010 Diagnostic Studio. I installed it successfully and tried it on my development evironment. I was able to build a report and a snapshot of the environment. I decided to turn my attention to my Employer's intranet environment. This would allow me to analyze it and measure it against benchmarks. I didn't want to install the Diagnostic studio on the Production Envorinment, lucky for me, the Diagnostic studio can be run remotely, well...kind of. Issue My development environment is a stand alone, full installation of SharePoint 2010 Server. It has Office 2010, SQL 2008 Enterprise, a DC...well you get the point, it's jammed packed! But more importantly it's a stand alone, self contained VM environment. Well Microsoft has instructions as to how to connect remotely with Diagnostic Studio here. The deciving part of this is that the SP2010DS prompts you for credentails. So I thought I was getting the right account to run the reports. I tried all the Power Shell commands in the link above but I still ended up getting the following errors: 06/28/2011 12:50:18    Connecting to remote server failed with the following error message : The WinRM client cannot process the request...If the SPN exists, but CredSSP cannot use Kerberos to validate the identity of the target computer and you still want to allow the delegation of the user credentials to the target computer, use gpedit.msc and look at the following policy: Computer Configuration -> Administrative Templates -> System -> Credentials Delegation -> Allow Fresh Credentials with NTLM-only Server Authentication.  Verify that it is enabled and configured with an SPN appropriate for the target computer. For example, for a target computer name "myserver.domain.com", the SPN can be one of the following: WSMAN/myserver.domain.com or WSMAN/*.domain.com. Try the request again after these changes. For more information, see the about_Remote_Troubleshooting Help topic. 06/28/2011 12:54:47    Access to the path '\\<targetserver>\C$\Users\<account logging in>\AppData\Local\Temp' is denied. You might also get an error message like this: The WinRM client cannot process the request. A computer policy does not allow the delegation of the user credentials to the target computer. Explanation After looking at the event logs on the target environment, I noticed that there were a several Security Exceptions. After looking at the specifics around who was denied access, I was able to see the account that was being denied access, it was the client machine administrator account. Well of course that was never going to work!!! After some quick Googling, the last error message above will lead you to edit the Local Group Policy on the client server. And although there are instructions from microsoft around doing this, it really will not work in this scenario. Notice the Description and how it only applices to authentication mentioned? Resolution I can tell you what I did, but I wish there was a better way but I simply don't know if it's duable any other way. Because my development environment had it's own DC, I didn't really want to mess with Kerberos authentication. I would also not be smart to connect that server to the domain, considering it has it's own DC. I ended up installing SharePoint 2010 Diagnostic Studio on another Windows 7 Dev environment I have, and connected the machien to the domain. I ran all the necesary remote credentials commands mentioned here. Those commands add the group policy for you! Once I did this I was able to authenticate properly and I was able to get the reports. Conclusion   You can run SharePoint 2010 Diagnostic Studio Remotely but it will require some specific scenarions. A couple of things I should mention is that as far as I understand, SP2010 DS, will install agents on your target environment to run tests and retrieve the data. I was a Farm Administrator, and also a Server Admin on SharePoint Server. I am not 100% sure if you need all those permissions but I that's just what I have to my internal intranet.   I deally I would like to have a machine that I can have SharePoint 2010 DIagnostic Studio installed and I can run that against client environments. It appears that I will not be able to do that, unless I enable Kerberos on my Windows 7 Machine now. If you have it installed in the same way I would like to have it, please let me know, I'll keep trying to get what I'm after. Hope this helps someone out there doing the same.

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  • Alternatives for saving data with jquery

    - by Phil Vallone
    I am not sure if this question is considered too broad, but I would like to reach out to my fellow programmers to see what alternatives are out there for saving data using jquery. I have a content management system that generates an set of HTML pages called an IETM (Interactive Electronic Technical Manual). The HTML pages are written in HTML and uses jquery. The ITEM is meant to be light weight, portable and run on most modern browsers. I am looking for a way to save data. I have considered cookies and sqlite. Are there any other alternatives for saving data using jquery?

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  • Deploying Data-Tier Applications of SQL Server 2008 R2

    SQL Server 2008 R2 Data-Tier Applications make database development, deployment and management much easier. When you create and build a Data Tier Application, it creates a single, self-contained unit of deployment called a DAC package. Arshad Ali shows you how to deploy the created DAC package and discusses the different methods of deployment. Free trial of SQL Backup™“SQL Backup was able to cut down my backup time significantly AND achieved a 90% compression at the same time!” Joe Cheng. Download a free trial now.

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  • Oracle Fusion HCM Gains Traction and Customer Recognition

    - by Scott Ewart
    Oracle Fusion HCM Gains Traction and Customer Recognition at the HRO Summit Europe in Barcelona Audience voted Oracle Fusion Human Capital Management as best in Most Reliable, Most Innovative and Best in Class. During the annual European HRO Summit in Barcelona, HRO buyers, service providers, third party advisors and other attendees were visibly impressed with the Fusion HCM product stack. Following the “present-off” among four technology vendors, Oracle was voted first in the following categories: Which technology could best suit the needs for your company Which technology do you think came across as the most reliable Which technology offers the most innovation Based on what you heard today, which technology presentation would you rate as best in class Oracle was voted second in the two other remaining categories Click here for the full article ==> http://bit.ly/sxC3tX

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  • eSTEP TechCast: Oracle Solaris 11 Express

    - by user797911
    Get an insight on how Oracle Solaris 11 Express has raised the bar on the innovation introduced in Oracle Solaris 10. Learn about the new integrated features such as: network based package management tools improvements to built-in virtualization new virtualised network architecture security enhancements file system evolution  Learn how Oracle Solaris 11 Express provides greatly decreased planned system downtime, performs a completely safe system upgrade, achieves an unprecedented level of flexibility for application consolidation, and provides the highest levels of security in your datacenter. Date and time: Thursday, 7. July 2011, 13:00 - 14:00 CEST Speaker: Joost Pronk van Hoogeveen Target audience: Tech Presales Webcast Coordinates: You will find the coordinates in the eSTEP portal under the Events tab. Use your email-adress and PIN: eSTEP_2011 to get access. We are happy to get your comments and feedback.

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  • High Availability documents for OBIA

    - by Lia Nowodworska - Oracle
    There are 2 white papers that have been created by Product Management and Advanced Resolution team (thanks Rajesh, Archana). These documents describe how to deploy a high-availability environment for the Weblogic components of BI Applications 11.1.1.8.1 and 11.1.1.7.1 including the Oracle Data Integrator. New  Configuring High Availability for Oracle Business Intelligence Applications Version 11.1.1.8.1 (Doc ID 1679319.1)  Updated Configuring High Availability for Oracle Business Intelligence Applications Version 11.1.1.7.1 (Doc ID 1587873.1)  When implementing OBIA please take some time to review one or both of the papers. Do you still have a quick question that you want an expert to have a look at: check in the OBIA Community:

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  • Alkan Improves Aeronautical-Equipment Product Collaboration, Design Processes, and Government Compliance

    - by Gerald Fauteux
    Alkan S.A. a leading aeronautical equipment manufacturer in France, specializing in carriage-release and ejection systems for various types of military aircraft utilize Oracle’s AutoVue Electro-Mechanical Professional for Agile as part of its Agile Product Lifecycle Management solution. AutoVue Electro-Mechanical Professional for Agile enables multiformat 3-D viewing of engineering designs, leading to deeper analysis of component and product functionality and allows all teams to easily participate and contribute to product data early in the development cycle. Alkan S.A.’s equipment is used in more than 65 countries and is certified for more than 60 types of aircraft, worldwide. Click here to read the complete story. French version.

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  • Problem with deleting table rows using ctrl+a for row selection

    - by Frank Nimphius
    Normal 0 false false false EN-US X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} The following code is commonly shown and documented for how to access the row key of selected table rows in an ADF Faces table configured for multi row selection. public void onRemoveSelectedTableRows(ActionEvent actionEvent) {    RichTable richTable = … get access to your table instance …    CollectionModel cm =(CollectionModel)richTable.getValue();    RowKeySet rowKeySet = (RowKeySet)richTable.getSelectedRowKeys();             for (Object key : rowKeySet) {       richTable.setRowKey(key);       JUCtrlHierNodeBinding rowData = (JUCtrlHierNodeBinding)cm.getRowData();       // do something with rowData e.g.update, print, copy   }    //optional, if you changed data, refresh the table         AdfFacesContext adfFacesContext = AdfFacesContext.getCurrentInstance(); adfFacesContext.addPartialTarget(richTable);   return null; } The code shown above works for 99.5 % of all use cases that deal with multi row selection enabled ADF Faces tables, except for when users use the ctrl+a key to mark all rows for delete. Just to make sure I am clear: if you use ctrl+a to mark rows to perform any other operation on them – like bulk updating all rows for a specific attribute – then this works with the code shown above. Even for bulk row delete, any other mean of row selection (shift+click and multiple ctrl+click) works like a charm and the rows are deleted. So apparently it is the use of ctrl+a that causes the problem when deleting multiple rows of an ADF Faces table. To implement code that works for all table selection use cases, including the one to delete all table rows in one go, you use the code shown below. public void onRemoveSelectedTableRows(ActionEvent actionEvent) {   RichTable richTable = … get access to your table instance …   CollectionModel cm = (CollectionModel)richTable.getValue();   RowKeySet rowKeySet = (RowKeySet)richTable.getSelectedRowKeys();   Object[] rowKeySetArray = rowKeySet.toArray();      for (Object key : rowKeySetArray){               richTable.setRowKey(key);     JUCtrlHierNodeBinding rowData = (JUCtrlHierNodeBinding)cm.getRowData();                              rowData.getRow().remove();   }   AdfFacesContext adfFacesContext = AdfFacesContext.getCurrentInstance();          adfFacesContext.addPartialTarget(richTable); }

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  • Gilbane Conference San Francisco 2010

    I attended the Gilbane Conference San Francisco 2010 today and did a short presentation on: Open Source Tools That are Changing the Content Technology Landscape Open Source tools are dramatically changing our perceptions of software and how we invest in tools for content creation, management and delivery. Open source tools are created more cheaply by a broad team of developers, but also may require strong support organizations to make them work, so they are never free. This session will examine...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • What use is a Business Logic Layer (BLL)?

    - by Andrew S. Arnold
    In reading up on good practice for database applications I've frequently come across advocates of so-called "business logic layers" and I'm trying to decide if it's best for my project to use one (it's a small personal project). My issue lies in the fact that I can't think of anything for the BLL to do that the DAL can't already handle (executing queries and mapping results to objects), so my BLL just calls the DAL without doing anything itself. Maybe I'm wrong about exactly what the DAL should be doing too. But regardless, what sorts of functionality should be expected of a BLL in a database management application?

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  • This week in the OTN Architect Center

    - by Bob Rhubart
    Updated every Monday, the Oracle Technology Network Architect Center is your one-stop for the latest content drawn from across the architect community. You find the articles and white papers, the latest ArchBeat Podcast, selected blog posts from community leaders, a list of events for architects, along with the latest information on Oracle products. Featured this week: A Fusion Applications Technical Overview A sample chapter from Managing Oracle Fusion Applications by Richard Bingham, new from Oracle Press. Oracle Optimized Solution for Lifecycle Content Management A new white paper from Donna Harland and Nick Kloski. Toronto Architect Day Panel Discussion - Part 2 The second of a four-part program featuring a live recording of the panel discussion from OTN Architect Day in Toronto, featuring Oracle ACE Director Cary Millsap, InfoQ.com editor and co-founder Floyd Marinescu, and members of Oracle's Enterprise Architecture team. Check it out: OTN Architect Center

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  • Which of Your Stored Procedures are Using the Most Resources?

    Dynamic Management Views and Functions aren't always easy to understand. However, they are the easiest way of finding out which of your stored procedures are using up the most resources. Greg takes the time to explain how and why these DMVs and DMFs get their information. Suddenly, it all gets clearer. Join SQL Backup’s 35,000+ customers to compress and strengthen your backups "SQL Backup will be a REAL boost to any DBA lucky enough to use it." Jonathan Allen. Download a free trial now.

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  • ubuntu 14 painfully slow on dell r200

    - by sirmonkey
    I didn't notice it at first. The machines (there is 20 plus) are to be used a simple file servers. It wasn't until samba just wouldn't act right that I installed a desktop gui and started more diagnoseing the problem did I catch the slow preformance... I've tested 4 servers they all suck. And windows 7 runs fantastic on them. I have Google and searched. But nothing to explain this. The easy test is dmesg is so slow you can almost read it. I'm guessing it's an apic or cpu power management issue. What output would you all like????? It is a core2 machine with 4Gb of ram. On board data.

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  • Oracle University Nuevos cursos (Week 42)

    - by rituchhibber
    Oracle University ha publicado recientemenete las siguentes formaciones (o versiones) nuevos: Database Oracle Enterprise Manager Cloud Control 12c: Install & Upgrade (Training On Demand) MySQL Performance Tuning (Training On Demand) Fusion Middleware Oracle GoldenGate 11g Fundamentals for Oracle (4 days) Oracle WebCenter Content 11g: Site Studio Essentials (5 days) Oracle WebCenter Portal 11g: Build Portals with Spaces (3 days) Business Intelligence Oracle BI 11g R1: Create Analyses and Dashboards (4 days) SOA & BPM SOA Adoption and Architecture Fundamentals (3 Days) eBusiness Suite R12 Oracle Using and Maintaining Approvals Management - Self-Study Course R12 Oracle HRMS Advanced Benefits Fundamentals - Self-Study Course WebLogic Oracle WebLogic Server 11g: Monitor and Tune Performance (Training On Demand) Financial Oracle Project Financial Planning 11.1.2: Create Projects ( 3 days) Tuxedo Oracle Tuxedo 12c: Application Administration (5 days) Java Java SE 7: The Platform Evolves - Self-Study Course Primevera Primavera Client/Server Partner Trainer Course - Self-Study Course Primavera Progress Reporter 8.2 - Self-Study Course Póngase en contacto con el equipo local de Oracle University para conocer las fechas y otros detalles de los cursos.

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  • Any way for ubuntu to use more than one core of i7 cpu on my Asus laptop?

    - by G. He
    Newly installed ubuntu 11.10 on a new Asus U46E laptop. /proc/cpuinfo correctly identified the cpu but shows only one core: processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 42 model name : Intel(R) Core(TM) i7-2640M CPU @ 2.80GHz stepping : 7 cpu MHz : 800.000 cache size : 4096 KB physical id : 0 siblings : 1 core id : 0 cpu cores : 1 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 13 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc up arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 x2apic popcnt aes xsave avx lahf_lm ida arat epb xsaveopt pln pts dts tpr_shadow vnmi flexpriority ept vpid bogomips : 5587.63 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: I search here and found the answer to one post suggesting remove boot parameter 'nolapic'. However, on my particular laptop, ubuntu won't boot without this nolapic parameter. Is there anyway for ubuntu correly utility the full cpu power?

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  • Understanding the 'High Performance' meaning in Extreme Transaction Processing

    - by kyap
    Despite my previous blogs entries on SOA/BPM and Identity Management, the domain where I'm the most passionated is definitely the Extreme Transaction Processing, commonly called XTP.I came across XTP back to 2007 while I was still FMW Product Manager in EMEA. At that time Oracle acquired a company called Tangosol, which owned an unique product called Coherence that we renamed to Oracle Coherence. Beside this innovative renaming of the product, to be honest, I didn't know much about it, except being a "distributed in-memory cache for Extreme Transaction Processing"... not very helpful still.In general when people doesn't fully understand a technology or a concept, they tend to find some shortcuts, either correct or not, to justify their lack-of understanding... and of course I was part of this category of individuals. And the shortcut was "Oracle Coherence Cache helps to improve Performance". Excellent marketing slogan... but not very meaningful still. By chance I was able to get away quickly from that group in July 2007* at Thames Valley Park (UK), after I attended one of the most interesting workshops, in my 10 years career in Oracle, delivered by Brian Oliver. The biggest mistake I made was to assume that performance improvement with Coherence was related to the response time. Which can be considered as legitimus at that time, because after-all caches help to reduce latency on cached data access, hence reduce the response-time. But like all caches, you need to define caching and expiration policies, thinking about the cache-missed strategy, and most of the time you have to re-write partially your application in order to work with the cache. At a result, the expected benefit vanishes... so, not very useful then?The key mistake I made was my perception or obsession on how performance improvement should be driven, but I strongly believe this is still a common problem to most of the developers. In fact we all know the that the performance of a system is generally presented by the Capacity (or Throughput), with the 2 important dimensions Speed (response-time) and Volume (load) :Capacity (TPS) = Volume (T) / Speed (S)To increase the Capacity, we can either reduce the Speed(in terms of response-time), or to increase the Volume. However we tend to only focus on reducing the Speed dimension, perhaps it is more concrete and tangible to measure, and nicer to present to our management because there's a direct impact onto the end-users experience. On the other hand, we assume the Volume can be addressed by the underlying hardware or software stack, so if we need more capacity (scale out), we just add more hardware or software. Unfortunately, the reality proves that IT is never as ideal as we assume...The challenge with Speed improvement approach is that it is generally difficult and costly to make things already fast... faster. And by adding Coherence will not necessarily help either. Even though we manage to do so, the Capacity can not increase forever because... the Speed can be influenced by the Volume. For all system, we always have a performance illustration as follow: In all traditional system, the increase of Volume (Transaction) will also increase the Speed (Response-Time) as some point. The reason is simple: most of the time the Application logics were not designed to scale. As an example, if you have a while-loop in your application, it is natural to conceive that parsing 200 entries will require double execution-time compared to 100 entries. If you need to "Speed-up" the execution, you can only upgrade your hardware (scale-up) with faster CPU and/or network to reduce network latency. It is technically limited and economically inefficient. And this is exactly where XTP and Coherence kick in. The primary objective of XTP is about designing applications which can scale-out for increasing the Volume, by applying coding techniques to keep the execution-time as constant as possible, independently of the number of runtime data being manipulated. It is actually not just about having an application running as fast as possible, but about having a much more predictable system, with constant response-time and linearly scale, so we can easily increase throughput by adding more hardwares in parallel. It is in general combined with the Low Latency Programming model, where we tried to optimize the network usage as much as possible, either from the programmatic angle (less network-hoops to complete a task), and/or from a hardware angle (faster network equipments). In this picture, Oracle Coherence can be considered as software-level XTP enabler, via the Distributed-Cache because it can guarantee: - Constant Data Objects access time, independently from the number of Objects and the Coherence Cluster size - Data Objects Distribution by Affinity for in-memory data grouping - In-place Data Processing for parallel executionTo summarize, Oracle Coherence is indeed useful to improve your application performance, just not in the way we commonly think. It's not about the Speed itself, but about the overall Capacity with Extreme Load while keeping consistant Speed. In the future I will keep adding new blog entries around this topic, with some sample codes experiences sharing that I capture in the last few years. In the meanwhile if you want to know more how Oracle Coherence, I strongly suggest you to start with checking how our worldwide customers are using Oracle Coherence first, then you can start playing with the product through our tutorial.Have Fun !

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