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  • Archbeat Link-O-Rama Top 10 Facebook Faves for October 20-26, 2013

    - by OTN ArchBeat
    What are the 4,460 fans of the OTN ArchBeat Facebook Page talking about? The list below represents the Top 10 most popular articles, blog posts, and other content from across the community. Enterprise Grade Deployment Considerations for Oracle Identity Manager AD Connector | Firdaus Fraz Oracle Fusion Middleware solution architect Firdaus Fraz illustrates provides best practice recommendations for setting up an enterprise deployment environment for the OIM connector for Microsoft Active Directory. A Roadmap for SOA Development and Delivery | Mark Nelson Do you know the way to S-O-A? Mark Nelson does. His latest blog post, part of an ongoing series, will help to keep you from getting lost along the way. The road ahead for WebLogic 12c | Edwin Biemond Oracle ACE Edwin Biemond shares his thoughts on announced new features in Oracle WebLogic 12.1.3 & 12.1.4 and compares those upcoming releases to Oracle WebLogic 12.1.2. Oracle GoldenGate 12c - New Release, New Features | Michael Rainey Rittman Mead's Michael Rainey takes you on guided tour through the GoldenGate 12c features that "are relevant to data warehouse and data migration work we typically see in the business intelligence world." Reproducing WebLogic Stuck Threads with ADF CreateInsert Operation and ORDER BY Clause | Andrejus Baranovsikis Another post from Oracle ACE Director Andrejus Baranovsikis on dealing with WebLogic Stuck Threads. This one includes a test case application you can download. The Impact of SaaS - The Times They Are A-Changin' | Floyd Teter Oracle ACE Director Floyd Teter shares some truly interesting insight gained in conversations with three Fortune 500 CIOs. Configure Oracle Identity Manager AD/LDAP Authentication | Arda Eralp A step-by-step how-to from a member of the Fusion Middleware Applications Consultancy team. Java-Powered Robot Named NAO Wows Crowds | Tori Wieldt Tori Wieldt interviews a robot and human. Updated ODI Statement of Direction | Robert Schweighardt Heads up Oracle Data Integrator fans! A new product statement of direction document is available, offering "an overview of the strategic product plans for Oracle’s data integration products for bulk data movement and transformation, specifically Oracle Data Integrator (ODI) and Oracle Warehouse Builder (OWB)." Oracle BI Apps 11.1.1.7.1 – GoldenGate Integration - Part 2: Setup and Configuration | Michael Rainey Michael Rainey continues his series with another technical article for you GoldenGate fans. Thought for the Day "Intuition will tell the thinking mind where to look next." — Jonas Salk, American medical researcher and virologist (October 28, 1914 – June 23, 1995) Source: brainyquote.com

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  • Code Information Indicators in Visual Studio 2013

    - by DigiMortal
    Visual Studio 2013 introduces new code editor enhancement called Code Information Indicators (CII). CII is set of code editor extensions that make it easier to get information about code structure and changes. Also tests and test results can be easily accessible from code editor. In this posting I will introduce you most important new code indicators. Read more from my new blog @ gunnarpeipman.com

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  • links for 2010-06-11

    - by Bob Rhubart
    The Web-Service May Not be the Bottleneck! | Shopzilla Tech Blog The web-service doesn't perform We have a performance problem we're investigating Sound familiar? Is the web-service under test really the performance (tags: ping.fm cloud soa oracle coherence virtualization)

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  • OSB 11g & SAP – Single Channel/Program ID for Multiple IDOCs

    - by Shub Lahiri, A-Team
    Background This note is a supplement to the blog entry, SOA 11g & SAP – Single Channel/Program ID for Multiple IDOCs by Greg Mally. Greg has shown how a single SOA Suite composite can be used with iWay Adapters to receive multiple IDOC types via a single channel in the adapter, corresponding to a single programID on the SAP system. We will try to address the same requirements within the OSB framework here. Project Built - Design Time The basic build of an OSB project with iWay SAP Adapter, as seen in another entry in this blog, consists of working in OSB Design console and Application Explorer. OSB Design Time - Part 1 We will create a placeholder project first in OSB with a proper directory structure, so that we can export the WSDL, XSD and the JCA binding information from Application Explorer directly into this project. Application Explorer - iWay Design Time Tool Receiving IDOCs is classified as an inbound event within Application Explorer. For setting up events, a channel is first defined (e.g. iDoc_Channel) using the same PROGRAMID (RFC destination), as defined within SAP for the OSB server. Next, the same channel is used to export the JCA Inbound Event artifacts for the candidate IDOC, e.g. DEBMAS06 directly to the pre-created OSB project. Note that the validation for schema has been turned off. As a result, this will allow the adapter, at runtime, to use a single channel to receive multiple IDOC types from SAP and pass them on to the OSB runtime engine without any validation. In other words, we do not have to repeat the above step for each IDOC type. OSB Design Time - Part 2 Create 2 simple XML based Business Services to write to a file, e.g.  SAP_DEBMAS_File and SAP_MATMAS_File. Next, generate a Proxy Service using the JCA binding file exported from Application Explorer in the previous section. In the generated proxy service, edit the message flow and add a route node. Add a routing table in the route node with the following routing function. fn:local-name-from-QName(fn:node-name($body/*[1])) This function takes advantage of the fact that the XML payload at runtime, after translation by adapter, has the IDOC type as the top element. With the routing function in place, build the routing table to add 2 branches to route the IDOCs to the appropriate Business Service for writing the XML payload to files in separate directories. This completes the build of the OSB project. Testing - Run-Time After deployment and activation, the SAP adapter will wait to receive multiple types of IDOCs sent from the SAP system using a single channel. Upon receipt of the IDOCs, the OSB project will route them appropriately to save the corresponding XML payloads for different IDOC types in different directories.

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  • Are there still plans for a new sound theme?

    - by Ingo Gerth
    Let me quote from Mark's blog almost one year ago: March 5th, 2010 at 7:19 pm Mark, will there be an update to the sound theme to match the updated visual brand? Mark Shuttleworth: Gack, I completely forgot about that. A very good point. Would you see if you can rally a round of community submissions for a sound theme inspired by light? Lets keep it short and sweet: What are the current considerations for the Ubuntu default sound theme?

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  • Entity framework support for table valued functions and thus full text

    - by simonsabin
    One of my most popular posts with over 10, 000 hits is how to enable full text when using LINQ to SQL http://sqlblogcasts.com/blogs/simons/archive/2008/12/18/LINQ-to-SQL---Enabling-Fulltext-searching.aspx , core to this is the use of a table valued function. I’m therefore interested to see that Entity Framework will support table valued functions in the next release for more details have a read of the efdesign blog http://blogs.msdn.com/b/efdesign/archive/2011/01/21/table-valued-function-support...(read more)

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  • SQLAuthority News – Download Whitepaper – SQL Server Analysis Services to Hive

    - by pinaldave
    The SQL Server Analysis Service is a very interesting subject and I always have enjoyed learning about it. You can read my earlier article over here. Big Data is my new interest and I have been exploring it recently. During this weekend this blog post caught my attention and I enjoyed reading it. Big Data is the next big thing. The growth is predicted to be 60% per year till 2016. There is no single solution to the growing need of the big data available in the market right now as well there is no one solution in the business intelligence eco-system available as well. However, the need of the solution is ever increasing. I am personally Klout user. You can see my Klout profile over. I do understand what Klout is trying to achieve – a single place to measure the influence of the person. However, it works a bit mysteriously. There are plenty of social media available currently in the internet world. The biggest problem all the social media faces is that everybody opens an account but hardly people logs back in. To overcome this issue and have returned visitors Klout has come up with the system where visitors can give 5/10 K+ to other users in a particular area. Looking at all the activities Klout is doing it is indeed big consumer of the Big Data as well it is early adopter of the big data and Hadoop based system.  Klout has to 1 trillion rows of data to be analyzed as well have nearly thousand terabyte warehouse. Hive the language used for Big Data supports Ad-Hoc Queries using HiveQL there are always better solutions. The alternate solution would be using SQL Server Analysis Services (SSAS) along with HiveQL. As there is no direct method to achieve there are few common workarounds already in place. A new ODBC driver from Klout has broken through the limitation and SQL Server Relation Engine can be used as an intermediate stage before SSAS. In this white paper the same solutions have been discussed in the depth. The white paper discusses following important concepts. The Klout Big Data solution Big Data Analytics based on Analysis Services Hadoop/Hive and Analysis Services integration Limitations of direct connectivity Pass-through queries to linked servers Best practices and lessons learned This white paper discussed all the important concepts which have enabled Klout to go go to the next level with all the offerings as well helped efficiency by offering a few out of the box solutions. I personally enjoy reading this white paper and I encourage all of you to do so. SQL Server Analysis Services to Hive Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, SQL White Papers, T SQL, Technology

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  • Building Custom HTTP Help Pages with WCF

    - by Jesse Ezell
    Been asked this a few times and needed to figure it out myself, so I put together a post on how to host custom HTTP help pages for your WCF services: http://blog.iserviceoriented.com/index.php/2010/05/04/building-custom-http-help-pages-with-wcf/ A little help from the WCF team to open up some of the internal classes would make it more straightforward... until them, it takes a bit of hacking and black magic.

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  • Windows Azure Role Instance Limits

    - by kaleidoscope
    Brief overview of the limits imposed on hosted services in Windows Azure is as follows: Effective before Dec. 10th 2009 Effective  after Dec. 10th 2009 Effective after Jan. 4th 2010 Token (CTP) Token (CTP) Token (non-billing country) Paying subscription Deployment Slots 2 2 2 2 Hosted Services 1 1 20 20 Roles per  deployment 5 5 5 5 Instances per Role 2 2 no limit no limit VM CPU Cores no limit 8 8 20 Storage Accounts 2 2 5 5 More Information: http://blog.toddysm.com/2010/01/windows-azure-role-instance-limits-explained.html   Amit, S

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  • Not attending the LUGM mini-meetup - 05. Oct 2013

    Not attending a meeting of the LUGM can be fun, too. It's getting a bit of a habit that Ish is organising small gatherings, aka mini-meetups, of the Linux User Group Mauritius/Meta (LUGM) almost every Saturday. There they mainly discuss and talk about various elements of using Linux as ones main operating systems and the possibilities you are going to have. On top of course, some tips & tricks about mastering the command line and initial steps in scripting or even writing HTML. In general, sounds like a good portion of fun and great spirit of community. Unfortunately, I'm usually quite busy with private and family matters during the weekend and so I already signalised that I wouldn't be around. Well, at least not physically... But this Saturday a couple of things worked out faster than expected and so I was hanging out on my machine. I made virtual contact with one of Pawan's messages over on Facebook... And somehow that kicked off some kind of an online game fun on basic configuration of Apache HTTPd 2.2.x, PHP 5.x and how to improve the overall performance of a newly installed blog based on WordPress. Default configuration files Nitin's website finally came alive and despite the dark theme and the hidden Apple 'fanboy' advertisement I was more interested in the technical situation. As with any new installation there is usually quite some adjustment to be done. And Nitin's page was no exception. Unfortunately, out of the box installations of Apache httpd and PHP are too verbose and expose too much information under the hood. You might think that this isn't really a problem at all, well, think about it again after completely reading this article. First, I checked the HTTP response headers - using either Chrome Developer Tools or Firefox Web Developer extension - of Nitin's page and based on that I advised him to lower the noise levels a little bit. It's not really necessary that detailed information about web server software and scripting language has to be published in every response made. Quite a number of script kiddies and exploits actually check for version specifics prior to an attack. So, removing at least version details hardens the system a little bit. In particular, I'm talking about these response values: Server X-Powered-By How to achieve that? By tweaking the configuration files... Namely, we are going to look into the following ones: apache2.conf httpd.conf .htaccess php.ini The above list contains some additional files, I'm talking about in the next paragraphs. Anyway, those are the ones involved. Tweaking Apache Open your favourite text editor and start to modify the apache2.conf. Eventually, you might like to have a quick peak at the file to see whether it is necessary to adjust it or not. Following is a handy combination of commands to get an overview of your active directives: # sudo grep -v '#' /etc/apache2/apache2.conf | grep -v '^$' | less There you keep an eye on those two Apache directives: ServerSignature Off ServerTokens Prod If that's not the case, change them as highlighted above. In order to activate your modifications you have to restart Apache httpd server. On Debian and Ubuntu you might use apache2ctl for that, on other distributions you might have to use service or run the init-scripts again: # sudo apache2ctl configtestSyntax OK# sudo apache2ctl restart Refresh your website and check the HTTP response header. Tweaking PHP5 (a little bit) Next, check your php.ini file with the following statement: # sudo grep -v ';' /etc/php5/apache2/php.ini | grep -v '^$' | less And check the value of expose_php = Off Again, if it's not as highlighted, change it... Some more Apache love Okay, back to Apache it might also be interesting to improve the situation about browser caching and removing more obsolete information. When you run your website against the usual performance checks like Google Page Speed and Yahoo YSlow you might see those check points with bad grades on a standard, default configuration. Well, this can be done easily. Configure entity tags (ETags) ETags are only interesting when you run your websites on a farm of multiple web servers. Removing this data for your static resources is very simple in Apache. As we are going to deal with the HTTP response header information you have to ensure that Apache is capable to manipulate them. First, check your enabled modules: # sudo ls -al /etc/apache2/mods-enabled/ | grep headers And in case that the 'headers' module is not listed, you have to enable it from the available ones: # sudo a2enmod headers Second, check your httpd.conf file (in case it exists): # sudo grep -v '#' /etc/apache2/httpd.conf | grep -v '^$' | less In newer (better said fresh) installations you might have to create a new configuration file below your conf.d folder with your favourite text editor like so: # sudo nano /etc/apache2/conf.d/headers.conf Then, in order to tweak your HTTP responses either check for those lines or add them: Header unset ETagFileETag None In case that your file doesn't exist or those lines are missing, feel free to create/add them. Afterwards, check your Apache configuration syntax and restart your running instances as already shown above: # sudo apache2ctl configtestSyntax OK# sudo apache2ctl restart Add Expires headers To improve the loading performance of your website, you should take some care into the proper configuration of how to leverage the browser's ability to cache certain resources and files. This is done by adding an Expires: value to the HTTP response header. Generally speaking it is advised that you specify a near-future, read: 1 week or a little bit more, for your static content like JavaScript files or Cascading Style Sheets. One solution to adjust this is to put some instructions into the .htaccess file in the root folder of your web site. Of course, this could also be placed into a more generic location of your Apache installation but honestly, I'd like to keep this at the web site level. Following some adjustments I'm currently using on this blog site: # Turn on Expires and set default to 0ExpiresActive OnExpiresDefault A0 # Set up caching on media files for 1 year (forever?)<FilesMatch "\.(flv|ico|pdf|avi|mov|ppt|doc|mp3|wmv|wav)$">ExpiresDefault A29030400Header append Cache-Control "public"</FilesMatch> # Set up caching on media files for 1 week<FilesMatch "\.(js|css)$">ExpiresDefault A604800Header append Cache-Control "public"</FilesMatch> # Set up caching on media files for 31 days<FilesMatch "\.(gif|jpg|jpeg|png|swf)$">ExpiresDefault A2678400Header append Cache-Control "public"</FilesMatch> As we are editing the .htaccess files, it is not necessary to restart Apache. In case that your web site doesn't load anymore or you're experiencing an error while trying to restart your httpd, check that the 'expires' module is actually an enabled module: # ls -al /etc/apache2/mods-enabled/ | grep expires# sudo a2enmod expires Of course, the instructions above a re not feature complete but I hope that they might provide a better default configuration for your LAMP stack. Resume of the day Within a couple of hours, and while being occupied with an eLearning course on SQL Server 2012, I had some good fun in helping and assisting other LUGM members while they were some kilometers away at Bagatelle. According to other blog articles it seems that Nitin had quite some moments of desperation. Just for the records: At no time it was my intention to either kick his butt or pull a leg on him. Simply, providing some input based on the lessons I've learned over the last couple of years configuring Apache HTTPd and PHP. Check out the other blogs, too: LUGM mini-meetup... Epic! Superb Saturday Linux Meetup And last but not least, the man himself: The end of a new beginning Cheers, and happy community'ing! Updates Due to our weekly Code & Coffee sessions in the MSCC community, I had a chance to talk to Nitin directly and he showed me the problems directly on his machine. This led to update this article hence the paragraphs on enabling the modules 'headers' and 'expires'.

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  • Additional new material WebLogic Community

    - by JuergenKress
    Oracle Cloud Application Foundation 12c Helps Customers Deliver Next-Generation Applications on a Mission-Critical Cloud Platform In a recent online event, Oracle and industry speakers introduced Oracle Cloud Application Foundation 12c, including Oracle WebLogic 12.1.2 and Oracle Coherence 12.1.2.  Read More Team Spotlight: Mike Lehmann, Vice President of Product Management Meet the team behind Oracle Fusion Middleware. In this edition, we speak to Mike Lehmann, Oracle’s vice president of product management for Oracle Cloud Application Foundation, Oracle WebLogic Server, Oracle Coherence, Java Cloud Services, and Java Platform, Enterprise Edition. Read More New and Free: Learn Oracle Application Development Framework Mobile Online at Your Convenience Are you ready to go mobile? Check out this new tutorial from Oracle’s ADF Academy - Developing Applications with Oracle Application Development Framework Mobile. New: Oracle JDeveloper 12c and Oracle Application Development Framework 12c Announcing Oracle JDeveloper 12c and Oracle Application Development Framework 12c. New capabilities include HTML5, better Maven support, Git support, new Oracle ADF Faces components, improved REST support, Enterprise JavaBeans/Java Persistence API, and the latest support for Oracle WebLogic Server 12.1.2. Get more details and download. New: Oracle Enterprise Pack for Eclipse 12c The best Eclipse-based tools for Oracle WebLogic and Oracle Coherence continue to get better. Check out the latest Oracle WebLogic and Oracle Coherence support, improved Oracle Application Development Framework support, Maven, and more. Register: Oracle WebLogic Devcast Series Join us for the upcoming Oracle WebLogic Devcast webcast. Oracle GlassFish Server 3.1.2 and 2.1.1 updates  & An Overview of JSON-P & Comprehensive Free Java EE 6 Video Tutorial! Java ME Embedded 3.3 and Java ME Software Development Kit (SDK) 3.3 Now Available - Optimized for microcontrollers and other resource-constrained devices, this release reduces "core plumbing" for an app, and includes more information about memory and network usage critical for low-power apps. JDK 8 Early Access Releases now available JDK 8 Early Access Developer Documentation - Get the latest documentation changes to the Java Developer Guides and the Java Tutorials - Blog NetBeans IDE 7.4 Beta - This release extends HTML5 features to Java EE and PHP application development, introduces new support for Hybrid HTML5 development on Android and iOS platforms, and preview support for JDK 8. WebLogic Partner Community For regular information become a member in the WebLogic Partner Community please visit: http://www.oracle.com/partners/goto/wls-emea ( OPN account required). If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Mix Forum Wiki Technorati Tags: WebLogic,WebLogic Community,Oracle,OPN,Jürgen Kress

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  • SQL SERVER Understanding ALTER INDEX ALL REBUILD with Disabled Clustered Index

    This blog is in response to the ongoing communication with the reader who had earlier asked the question of SQL SERVER Disable Clustered Index and Data Insert. The same reader has asked me the difference between ALTER INDEX ALL REBUILD and ALTER INDEX REBUILD along with disabled clustered index. Instead of writing a big [...]...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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  • Can anyone do anything about the spam here on weblogs.asp.net?

    - by Chris Hammond
    If there anyone out there who can do something about the spam here on weblogs.asp.net? Perhaps we could get some new software here that we could use to blog with? The old software barely works in Chrome (I can't see the rich text editor at this point), and lately the notification emails for Comments (which are mostly spam anyways) are pointing to http://weblogs.aspnet05.orcsweb.com which tries to get you to login with https://weblogs.aspnet05.orcsweb.com/ Anyone still maintaining this place?...(read more)

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  • TableTop: Wil Weaton, Morgan Webb, and Friends Review Pandemic [Video]

    - by Jason Fitzpatrick
    In the newest edition of TableTop, the board gaming video blog, Wil Weaton and his friends take a look at Pandemic–a challenging cooperative board game that pits players against a viral outbreak. Check out the above video for an overview of the game (although be forewarned they’re playing it on the highest difficulty setting) and then, for more information about it, hit up the Pandemic entry at BoardGameGeek. [via GeekDad] 7 Ways To Free Up Hard Disk Space On Windows HTG Explains: How System Restore Works in Windows HTG Explains: How Antivirus Software Works

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  • Meet the WebCenter Product Marketing Team!

    - by Kellsey Ruppel
    As we wrap up this week recapping all the great things that happened at Oracle OpenWorld, we thought we'd share with our community the faces behind this blog and the Oracle WebCenter Product Marketing team! With the majority of the team working remotely, OpenWorld is the one time we are all together for an entire week. L to R: Lance Shaw (WebCenter Content), Christie Flanagan (WebCenter Sites), Peggy Chen (leads WebCenter product marketing), Kellsey Ruppel (WebCenter Portal & Oracle Social Network), & Michael Snow (WebCenter Suite).

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  • Internet Explorer 9 ne soutiendra que le H.264 : vers un nouveau coup dur pour Flash ?

    Mise à jour du 30/04/10 Internet Explorer 9 ne supportera que le H.264 Vers un nouveau coup dur pour Flash ? Microsoft vient de réitérer son implication dans la future norme du HTML 5. « Le futur du Web c'est le HTML5 », a même écrit hier sur son blog le General Manager d'Internet Explorer, qui explique que « la spécification HTML 5 permet de décrire le support d'une vidéo sans spécifier un format particulier ». Jusqu'ici, rien de très nouveau, même si cette implication pose la question de son articulation avec Silverlight, le concurrent maison de Flash (lire par ailleurs :

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  • DotNetNuke 6 beta released

    - by Chris Hammond
    DotNetNuke 6 is coming, DotNetNuke 6 is coming! That’s right, we’re getting close, close enough that we had our first “beta” for DNN6 today. While we’ve had a couple of CTP (community technology preview) releases, the beta today has quite a bit of things wrapped up and addressed. There are a number of new things coming in DotNetNuke 6, and rather than try to explain them all I’ll point you to Joe Brinkman’s blog post from this morning . The biggest thing is that most of the Admin and Module settings...(read more)

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  • Recording Available: March 2012 Quarterly Customer Update Webcast

    - by R.Hunter
    Missed the recent Quarterly Customer Update Webcast? We covered several topics including: * WebCenter 4 Pillars overview * Support Update * WebCenter Content 11gR1 Update * WebCenter Portal 11gR1 Update * Oracle Social Network Overview VIEW WEBCAST RECORDING: Access the March 2012 Webcast recording and presentation by going to: My Oracle Support Site Note: 568127.1 We'll announce the next Quarterly Customer Update Webcast here on the WebCenter Alerts blog.

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  • Recent uploaded slides for the Upgrade Talks last week

    - by Mike Dietrich
    Welcome 2011 :-) And here you'll find the newest talks Carol, Roy and Brian delivered last week in several cities (please find the also in the DOWNLOAD SLIDES section on the right side of this blog): Upgrade Methods and Upgrade Planning: Click here to Download and use the keyword: roy2011 +500 Slides Upgrade Workshop Presentation: Click here to Download and use the keyword (Schlüsselwort): upgrade112 Hope you had a nice weekend and wonderful weather, too, as we had yesterday south of Munich. Click pic for a higher resolution: Starnberg Lake - View towards the Alps

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  • PowerShell ISE: Multi-line Comment and Uncomment Done Right, and other ISE GUI must haves

    - by deadlydog
    Originally posted on: http://geekswithblogs.net/deadlydog/archive/2013/06/19/powershell-ise-multi-line-comment-and-uncomment-done-right-and-other.aspxI’ve written some code that you can add to your ISE profile that adds keyboard shortcuts to quickly comment and uncomment lines in PowerShell ISE.  Feel free to skip the Preamble and get right to the good stuff. Read more at http://blog.danskingdom.com/powershell-ise-multiline-comment-and-uncomment-done-right-and-other-ise-gui-must-haves/

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  • Visual Studio 2012 Launch Winnipeg&ndash;Slides

    - by Dylan Smith
    The Winnipeg .Net User Group hosted a VS 2012 Launch Event at the Imax in Winnipeg on Thursday, Dec 6.  Doing presentations on the giant Imax screen is always fun, and I did the first 2 sessions on: End-To-End Application Lifecycle Management with TFS 2012 Improving Developer Productivity with Visual Studio 2012 Thanks to everybody that came out, and if anybody is interested my slide decks can be downloaded here: TFS 2012 Slides VS 2012 Slides Also the Virtual Machine that I used to do my demo’s can be downloaded from Brian Keller’s blog here: VS 2012 ALM Virtual Machine

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  • To SYNC or not to SYNC – Part 3

    - by AshishRay
    I can't believe it has been almost a year since my last blog post. I know, that's an absolute no-no in the blogosphere. And I know that "I have been busy" is not a good excuse. So - without trying to come up with an excuse - let me state this - my apologies for taking such a long time to write the next Part. Without further ado, here goes. This is Part 3 of a multi-part blog article where we are discussing various aspects of setting up Data Guard synchronous redo transport (SYNC). In Part 1 of this article, I debunked the myth that Data Guard SYNC is similar to a two-phase commit operation. In Part 2, I discussed the various ways that network latency may or may not impact a Data Guard SYNC configuration. In this article, I will talk in details regarding why Data Guard SYNC is a good thing. I will also talk about distance implications for setting up such a configuration. So, Why Good? Why is Data Guard SYNC a good thing? Because, at the end of the day, this gives you the assurance of zero data loss - it doesn’t matter what outage may befall your primary system. Befall! Boy, that sounds theatrical. But seriously - think about this - it minimizes your data risks. That’s a big deal. Whether you have an outage due to bad disks, faulty hardware components, hardware / software bugs, physical data corruptions, power failures, lightning that takes out significant part of your data center, fire that melts your assets, water leakage from the cooling system, human errors such as accidental deletion of online redo log files - it doesn’t matter - you can have that “Om - peace” look on your face and then you can failover to the standby system, without losing a single bit of data in your Oracle database. You will be a hero, as shown in this not so imaginary conversation: IT Manager: Well, what’s the status? You: John is doing the trace analysis on the storage array. IT Manager: So? How long is that gonna take? You: Well, he is stuck, waiting for a response from <insert your not-so-favorite storage vendor here>. IT Manager: So, no root cause yet? You: I told you, he is stuck. We have escalated with their Support, but you know how long these things take. IT Manager: Darn it - the site is down! You: Not really … IT Manager: What do you mean? You: John is stuck, but Sreeni has already done a failover to the Data Guard standby. IT Manager: Whoa, whoa - wait! Failover means we lost some data, why did you do this without letting the Business group know? You: We didn’t lose any data. Remember, we had set up Data Guard with SYNC? So now, any problems on the production – we just failover. No data loss, and we are up and running in minutes. The Business guys don’t need to know. IT Manager: Wow! Are we great or what!! You: I guess … Ok, so you get it - SYNC is good. But as my dear friend Larry Carpenter says, “TANSTAAFL”, or "There ain't no such thing as a free lunch". Yes, of course - investing in Data Guard SYNC means that you have to invest in a low-latency network, you have to monitor your applications and database especially in peak load conditions, and you cannot under-provision your standby systems. But all these are good and necessary things, if you are supporting mission-critical apps that are supposed to be running 24x7. The peace of mind that this investment will give you is priceless, especially if you are serious about HA. How Far Can We Go? Someone may say at this point - well, I can’t use Data Guard SYNC over my coast-to-coast deployment. Most likely - true. So how far can you go? Well, we have customers who have deployed Data Guard SYNC over 300+ miles! Does this mean that you can also deploy over similar distances? Duh - no! I am going to say something here that most IT managers don’t like to hear - “It depends!” It depends on your application design, application response time / throughput requirements, network topology, etc. However, because of the optimal way we do SYNC, customers have been able to stretch Data Guard SYNC deployments over longer distances compared to traditional, storage-centric ways of doing this. The MAA Database 10.2 best practices paper Data Guard Redo Transport & Network Configuration, and Oracle Database 11.2 High Availability Best Practices Manual talk about some of these SYNC-related metrics. For example, a test deployment of Data Guard SYNC over 330 miles with 10ms latency showed an impact less than 5% for a busy OLTP application. Even if you can’t deploy Data Guard SYNC over your WAN distance, or if you already have an ASYNC standby located 1000-s of miles away, here’s another nifty way to boost your HA. Have a local standby, configured SYNC. How local is “local”? Again - it depends. One customer runs a local SYNC standby across the campus. Another customer runs it across 15 miles in another data center. Both of these customers are running Data Guard SYNC as their HA standard. If a localized outage affects their primary system, no problem! They have all the data available on the standby, to which they can failover. Very fast. In seconds. Wait - did I say “seconds”? Yes, Virginia, there is a Santa Claus. But you have to wait till the next blog article to find out more. I assure you tho’ that this time you won’t have to wait for another year for this.

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