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  • Oracle Linux Friday Spotlight - November 1, 2013

    - by Chris Kawalek
    Happy Friday! I hope you were able to catch our webcast "Why Choose Oracle Linux for your Oracle Database 12c Deployments" earlier this week so you could ask questions of our experts in real-time. But if you didn't, or want to share the content with your colleagues, the on-demand version is our Friday Spotlight this week. Watch now: Why Choose Oracle Linux for your Oracle Database 12c Deployments We'll see you next week! -Chris

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  • DBA Best Practices - A Blog Series: Episode 1 - Backups

    - by Argenis
      This blog post is part of the DBA Best Practices series, on which various topics of concern for daily database operations are discussed. Your feedback and comments are very much welcome, so please drop by the comments section and be sure to leave your thoughts on the subject. Morning Coffee When I was a DBA, the first thing I did when I sat down at my desk at work was checking that all backups have completed successfully. It really was more of a ritual, since I had a dual system in place to check for backup completion: 1) the scheduled agent jobs to back up the databases were set to alert the NOC in failure, and 2) I had a script run from a central server every so often to check for any backup failures. Why the redundancy, you might ask. Well, for one I was once bitten by the fact that database mail doesn't work 100% of the time. Potential causes for failure include issues on the SMTP box that relays your server email, firewall problems, DNS issues, etc. And so to be sure that my backups completed fine, I needed to rely on a mechanism other than having the servers do the taking - I needed to interrogate the servers and ask each one if an issue had occurred. This is why I had a script run every so often. Some of you might have monitoring tools in place like Microsoft System Center Operations Manager (SCOM) or similar 3rd party products that would track all these things for you. But at that moment, we had no resort but to write our own Powershell scripts to do it. Now it goes without saying that if you don't have backups in place, you might as well find another career. Your most sacred job as a DBA is to protect the data from a disaster, and only properly safeguarded backups can offer you peace of mind here. "But, we have a cluster...we don't need backups" Sadly I've heard this line more than I would have liked to. You need to understand that a cluster is comprised of shared storage, and that is precisely your single point of failure. A cluster will protect you from an issue at the Operating System level, and also under an outage of any SQL-related service or dependent devices. But it will most definitely NOT protect you against corruption, nor will it protect you against somebody deleting data from a table - accidentally or otherwise. Backup, fine. How often do I take a backup? The answer to this is something you will hear frequently when working with databases: it depends. What does it depend on? For one, you need to understand how much data your business is willing to lose. This is what's called Recovery Point Objective, or RPO. If you don't know how much data your business is willing to lose, you need to have an honest and realistic conversation about data loss expectations with your customers, internal or external. From my experience, their first answer to the question "how much data loss can you withstand?" will be "zero". In that case, you will need to explain how zero data loss is very difficult and very costly to achieve, even in today's computing environments. Do you want to go ahead and take full backups of all your databases every hour, or even every day? Probably not, because of the impact that taking a full backup can have on a system. That's what differential and transaction log backups are for. Have I answered the question of how often to take a backup? No, and I did that on purpose. You need to think about how much time you have to recover from any event that requires you to restore your databases. This is what's called Recovery Time Objective. Again, if you go ask your customer how long of an outage they can withstand, at first you will get a completely unrealistic number - and that will be your starting point for discussing a solution that is cost effective. The point that I'm trying to get across is that you need to have a plan. This plan needs to be practiced, and tested. Like a football playbook, you need to rehearse the moves you'll perform when the time comes. How often is up to you, and the objective is that you feel better about yourself and the steps you need to follow when emergency strikes. A backup is nothing more than an untested restore Backups are files. Files are prone to corruption. Put those two together and realize how you feel about those backups sitting on that network drive. When was the last time you restored any of those? Restoring your backups on another box - that, by the way, doesn't have to match the specs of your production server - will give you two things: 1) peace of mind, because now you know that your backups are good and 2) a place to offload your consistency checks with DBCC CHECKDB or any of the other DBCC commands like CHECKTABLE or CHECKCATALOG. This is a great strategy for VLDBs that cannot withstand the additional load created by the consistency checks. If you choose to offload your consistency checks to another server though, be sure to run DBCC CHECKDB WITH PHYSICALONLY on the production server, and if you're using SQL Server 2008 R2 SP1 CU4 and above, be sure to enable traceflags 2562 and/or 2549, which will speed up the PHYSICALONLY checks further - you can read more about this enhancement here. Back to the "How Often" question for a second. If you have the disk, and the network latency, and the system resources to do so, why not backup the transaction log often? As in, every 5 minutes, or even less than that? There's not much downside to doing it, as you will have to clear the log with a backup sooner than later, lest you risk running out space on your tlog, or even your drive. The one drawback to this approach is that you will have more files to deal with at restore time, and processing each file will add a bit of extra time to the entire process. But it might be worth that time knowing that you minimized the amount of data lost. Again, test your plan to make sure that it matches your particular needs. Where to back up to? Network share? Locally? SAN volume? This is another topic where everybody has a favorite choice. So, I'll stick to mentioning what I like to do and what I consider to be the best practice in this regard. I like to backup to a SAN volume, i.e., a drive that actually lives in the SAN, and can be easily attached to another server in a pinch, saving you valuable time - you wouldn't need to restore files on the network (slow) or pull out drives out a dead server (been there, done that, it’s also slow!). The key is to have a copy of those backup files made quickly, and, if at all possible, to a remote target on a different datacenter - or even the cloud. There are plenty of solutions out there that can help you put such a solution together. That right there is the first step towards a practical Disaster Recovery plan. But there's much more to DR, and that's material for a different blog post in this series.

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  • Finding the order of a set's elements

    - by Maciej Stachowski
    A little rephrased, in the form of a game, real-life problem: Suppose there is a set of elements {1, 2, ..., n}. Player A has chosen a single permutation of this set. Player B wants to find out the order of the elements by asking questions of form "Is X earlier in the permutation than Y?", where X and Y are elements of the set. Assuming B wants to minimize the amount of questions, how many times would he have to ask, and what would be the algorithm?

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  • Ideas for time-keeping in a webbased RPG?

    - by ashy_32bit
    I'm assigned a task of doing the preliminary research stuff for a web-based MMO RPG. Now my buggiest problem here is "web based" vs "MMO RPG". I did some research about time keeping systems and I'm totally confused as how exactly something as real-time as an MMO-RPG can work on some pull-only (unidirectional) platform like HTTP. I know there is also a turn-based alternative to time keeping but can it work in an MMO setting ? EDIT: Take a battle for example, player A (human) wants to attack Player B (also human) in the open. How does it work when when player A issues the "attack" command on player B ? how do I inform player B that he is being attacked ? and then how exactly the battle goes on between the two in an HTTP based communication channel? To my knowledge this is impossible unless you resort to another technology (HTML is 1-way, that is you can just ask server and get response, server can't update you unless being asked to. this is very well-known and simply explained). So I though maybe I can somehow change the whole timekeeping model from real-time to a more non-real-time model (towards a turn based RPG for example) and somehow work around the whole problem of "interactivity". EDIT2: It is not that I don't wanna use any server side technologies. For sure it is not gonna work client-side-only even for the most trivial of the multi-player games, let alone an RPG. So sure there would be a (probably complex) server side component to it (the so called Game Engine I suppose). The problem is not the technology that implements the logic (game mechanics) bits but the communication technology and how it limits the game mechanics abilities (like how real-time or turn based it is gonna be). HTTP is a request-response protocol meaning you get served only if you ask for it (explicitly send a GET or POST request to the server). HTTP server can not inform you if anything of interest happens in the game world unless you refresh the page (as some suggested) or you use some bi-directional tech (totally different animals) like Flash, WebSock, HTML5 etc etc. So maybe the question is: Is it possible to implement a MMORPG using only HTML5/PHP and no periodic page refreshes? if so what would be rules to make it an MMO-RPG? Can't explain it any clearer. Sorry :D

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  • Is there any evidence that lisp actually is better than other languages at artificial intelligence?

    - by Joe D
    I asked this question on SO but it was closed fairly promptly (within 3 minutes) because it was too subjective. I then thought to ask it here on Programmers, a site for "subjective questions on software development". Quoting from the original question: There seems to be a long-held belief (mainly by non-lispers) that lisp is only good for developing AI. Where did this belief originate? And is there any basis in fact to it?

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  • What types of objects are useful in SQL CLR?

    - by Greg Low
    I've had a number of people over the years ask about whether or not a particular type of object is a good candidate for SQL CLR integration. The rules that I normally apply are as follows: Database Object Transact-SQL Managed Code Scalar UDF Generally poor performance Good option when limited or no data-access Table-valued UDF Good option if data-related Good option when limited or no data-access Stored Procedure Good option Good option when external access is required or limited data access DML...(read more)

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  • PASS Budget Posted

    - by Bill Graziano
    If you’re a member of PASS you can view our FY2011 budget at http://www.sqlpass.org/AboutPASS/Governance.aspx.  Our detailed budget is 29 pages long and provides an incredibly detailed snapshot of where our money comes from and how we spend it.  I’ve also written a summary highlighting some of the changes from last year.  If you have any questions about the budget you can ask them here or on the PASS site.

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  • Which is Better - Paid Or Free Web Directories?

    There are thousands of human edited Web directories in the internet today although many are exiting this niche or business, new directories are being put up as each day passes by. Despite having so many Web directories to choose from at the end you will come up with two types of them, a paid and a free one and you might ask yourself which is better among them?

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  • How Does PowerPoint Play In A Great Presentation?

    ?Four score and seven years ago?? Abraham Lincoln?s famous Gettysburg address. ?Ask not what your country can do for you, but what you can do for your country.? John F. Kennedy?s famous address to t... [Author: Anne Warfield - Computers and Internet - June 10, 2010]

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  • Why are source control systems still mostly backed with files?

    - by Andy
    It seems that more source control systems still use files as the means of storing the version data. Vault and TFS use Sql Server as their data store, which I would think would be better for data consistency as well as speed. So why is it that SVN, I believe GIT, CVS, etc still use the file system as essentially a database, (I ask this question as we had our SVN server just corrupt itself during a normal commit) instead of using actual database software (MSSQL, Oracle, Postgre, etc)?

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  • We need you! Sign up now to give Oracle your feedback on future product design trends at OpenWorld 2012

    - by mvaughan
    By Kathy Miedema, Oracle Applications User Experience Get the most from your Oracle OpenWorld 2012 experience and participate in a usability feedback session, where your expertise will help Oracle develop unbeatable products and solutions. Sign up to attend a one-hour session during Oracle OpenWorld. You’ll learn about Oracle’s future design trends -- including mobile applications and social networking -- and how these trends will affect your users down the road. A street scene from Oracle OpenWorld 2011. Oracle’s usability experts will guide you through practical learning sessions on the user experience of various business applications, middleware, and more. All user feedback sessions will be conducted October 1–3 at the InterContinental San Francisco Hotel on Howard Street, just a few steps away from the Moscone Center. To best match you with a user feedback activity, we will ask you about your role at your company. Our user feedback opportunities include focus groups, surveys, and one-on-one sessions with usability engineers. What do you get out of it? Customer and partner participants in the past have been surprised to learn how tuned in Oracle is to work that their applications users do every day. Oracle’s User Experience team members are trained to listen carefully, ask specific questions, interpret your answers, and work with designers to create products and solutions that suit your needs. Our goal is to help make you and your users more productive and efficient. Learn about Oracle’s process, and take advantage of the chance to give your specific feedback to the designers who create the enterprise applications of your future. See for yourself how Oracle collects feedback and measures its designs for turning them into code. Seats are limited for Oracle’s user feedback sessions, so sign up now by sending an e-mail to [email protected] with the subject line: Sign Me Up for an Oracle OpenWorld 2012 UX Session. For more information about customer feedback sessions and what you can learn from them, please visit the Usable Apps website. When: Monday-Wednesday during OpenWorld 2012, Oct. 1-3 Where: The InterContinental San Francisco Hotel How to sign up: RSVP now by sending an email to [email protected] with the subject line “Sign me up for an OOW 2012 UX Session.” Learn more: Visit the Usable Apps website at Get Involved.

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  • 2-d lighting day/night cycle

    - by Richard
    Off the back of this post in which I asked two questions and received one answer, which I accepted as a valid answer. I have decided to re-ask the outstanding question. I have implemented light points with shadow casting as shown here but I would like an overall map light with no point/light source. The map setup is a top-down 2-d 50X50 pixel grid. How would I go about implementing a day/night cycle lighting across a map?

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  • Tips For Getting the Best Web Development

    For many people getting custom web development sounds like a complicated endeavor. It is true, that getting a good overall work output from a company or an individual in regards to web creation can turn sour fast, but you can utilize a few tips and ask a few questions to make sure that you're not getting swindled.

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  • Answer programming for "What are your interests?" interview questions?

    - by Morgan Herlocker
    For interview questions that ask for personal hobbies, should you mention a bunch of tech activities you enjoy, like how "I love building java applets in my free time" or should you focus on non-programming activities to show you are well rounded? Does it show passion to say programming is a hobby, or does it sound disingenuous? I could see it going either way, so please back up your answer with some sound reasoning.

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  • Efficient, partial, point-in-time database restores

    - by GavinPayneUK
    This article is about a situation that many of us could describe the theoretical approach to solving, but then struggle to understand why SQL Server wasn’t following that theoretical approach when you tried it for real. Earlier this week, I had a client ask about the best way to perform: a partial database restore, 1 of 1300 filegroups; to a specific point in time; using a differential backup, and therefore; without restoring each transaction log backup taken since the full backup. The last point...(read more)

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  • C Minishell Command Expansion Printing Gibberish

    - by Optimus_Pwn
    I'm writing a unix minishell in C, and am at the point where I'm adding command expansion. What I mean by this is that I can nest commands in other commands, for example: $> echo hello $(echo world! ... $(echo and stuff)) hello world! ... and stuff I think I have it working mostly, however it isn't marking the end of the expanded string correctly, for example if I do: $> echo a $(echo b $(echo c)) a b c $> echo d $(echo e) d e c See it prints the c, even though I didn't ask it to. Here is my code: msh.c - http://pastebin.com/sd6DZYwB expand.c - http://pastebin.com/uLqvFGPw I have a more code, but there's a lot of it, and these are the parts that I'm having trouble with at the moment. I'll try to tell you the basic way I'm doing this. Main is in msh.c, here it gets a line of input from either the commandline or a shellfile, and then calls processline (char *line, int outFD, int waitFlag), where line is the line we just got, outFD is the file descriptor of the output file, and waitFlag tells us whether or not we should wait if we fork. When we call this from main we do it like this: processline (buffer, 1, 1); In processline, we allocate a new line: char expanded_line[EXPANDEDLEN]; We then call expand, in expand.c: expand(line, expanded_line, EXPANDEDLEN); In expand, we copy the characters literally from line to expanded_line until we find a $(, which then calls: static int expCmdOutput(char *orig, char *new, int *oldl_ind, int *newl_ind) orig is line, and new is expanded line. oldl_ind and newl_ind are the current positions in the line and expanded line, respectively. Then we pipe, and recursively call processline, passing it the nested command(for example, if we had "echo a $(echo b)", we would pass processline "echo b"). This is where I get confused, each time expand is called, is it allocating a new chunk of memory EXPANDEDLEN long? If so, this is bad because I'll run out of stack room really quickly(in the case of a hugely nested commandline input). In expand I insert a null character at the end of the expanded string, so why is it printing past it? If you guys need any more code, or explanations, just ask. Secondly, I put the code in pastebin because there's a ton of it, and in my experience people don't like it when I fill up several pages with code. Thanks.

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  • How do I take responsibility for my code when colleague makes unnecessary improvements without notice?

    - by Jesslyn
    One of my teammates is a jack of all trades in our IT shop and I respect his insight. However, sometimes he reviews my code (he's second in command to our team leader, so that's expected) without a heads up. So sometimes he reviews my changes before they complete the end goal and makes changes right away... and has even broken my work once. Other times, he has made unnecessary improvements to some of my code that is 3+ months old. This annoys me for a few reasons: I am not always given a chance to fix my mistakes He has not taken the time to ask me what I was trying to accomplish when he is confused, which could affect his testing or changes I don't always think his code is readable Deadlines are not an issue and his current workload doesn't require any work in my projects other than reviewing my code changes. Anyways, I have told him in the past to please keep me posted if he sees something in my work that he wants to change so that I could take ownership of my code (maybe I should have said "shortcomings") and he's not been responsive. I fear that I may come off as aggressive when I ask him to explain his changes to me. He's just a quiet person who keeps to himself, but his actions continue. I don't want to banish him from making code changes (not like I could), because we are a team--but I want to do my part to help our team. Added clarifications: We share 1 development branch. I do not wait until all my changes complete a single task because I risk losing some significant work--so I make sure my changes build and do not break anything. My concern is that my teammate doesn't explain the reason or purpose behind his changes. I don't think he should need my blessing, but if we disagree on an approach I thought it would be best to discuss the pros and cons and make a decision once we both understand what is going on. I have not discussed this with our team lead yet as I would prefer to resolve personal disagreements without getting management involved unless it is necessary. Since my concern seemed more of personal issue than a threat to our work, I chose to not bother the team lead. I am working on code review process ideas--to help promote the benefits of more organized code reviews without making it all about my pet peeves.

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  • Oracle Linux Hands-on Lab from your Home? Yes You Can Do That!

    - by Zeynep Koch
    We're taking the very popular OTN Sysadmin Days and going virtual! We have two days to choose from: Americas - Tuesday January 15th, 2013 9:00 a.m – 1:00 p.m. PT / 12:00 p.m. – 4:00 p.m. ET / 1:00 p.m. - 5:00 p.m. BRT EMEA -  Tuesday January 29th, 2013 - 9:00 a.m – 13:00 p.m GMT / 10:00 a.m – 14:00 p,m CET / 12:00 p.m – 16:00 p.m AST / 13:00 p.m – 17:00 p,m MSK / 14:30 p.m – 18:30 p.m IST You'll be able to perform real-world tasks with Oracle Linux and if you have questions you can ask for help from the Oracle experts through chat window. There's one caveat: you'll have to do a little homework ahead of time. Load the virtual images onto your laptop, find the instructions, and make sure everything is working properly. This wiki https://wikis.oracle.com/display/virtualsysadminday/Home explains what you need to do. If you have questions, ask them as comments to the wiki:https://wikis.oracle.com/display/virtualsysadminday/Home.  Oracle Linux Track  1. Oracle Linux Technology Overview - In this session we will go over the latest Oracle Linux features including tools for Linux administration such as the Unbreakable Linux Network (ULN) and public yum. We will also show you a demo of Ksplice zero downtime kernel updates, only available to Oracle Linux customers. You will see how easy it is to switch from Red Hat support to Oracle Linux support by using ULN. Last but not least, we’ll introduce the 3 hands-on labs that will follow this session in the Linux track. 2. HOL: Package Management -  In this lab session you will use the package management on Oracle Linux using RPM and yum. Some of the tasks that you will experience include listing installed packages, obtaining additional information about packages, searching for packages and installing/updating them as well as verifying package integrity and removing software. We’ll also review Linux services and run levels, how to start and stop them, checking the status of a particular service and enabling a service to be started automatically at system boot. 3. HOL: Storage Management - In this hands-on lab session, you will learn about storage management with LVM2, the Linux Logical Volume Manager, preparing block devices, creating physical and logical volumes, creating file systems on top of logical volumes, and resizing file systems dynamically. You will also practice setting up software RAID devices, configuring encrypted block devices.Btrfs File System - In this hands-on lab session, we will introduce you to Btrfs file system. You will be able to create and mount a Btrfs file system and learn to setup a mirrored/striped file system across multiple block devices. You’ll also learn how to add and remove block devices, and create file system snapshots. Register for this FREE event.

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  • books on web server technology [closed]

    - by tushar
    i need to understand the web server technologies as to how are the packets recieved how does it respond and understand httpd.conf files and also get to undertand what terms like proxy or reverse proxy actually mean. but i could not find any resources so please help me and suggest some ebook or web site and by server i dont mean a specific one (apache or nginx..) in short a book on understanding the basics about a web server i already asked this on stackoverflow and webmasters in a nutshell was the answer i got and they said its better if i ask it here so please help me out

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  • A conversation with world experts in Customer Experience Management in Rome, Italy - Wed, June 20, 2012

    - by nicolasbonnet
    It is my pleasure to share the registration link below for your chance to meet active members of the Oracle Real-Time Decisions Customer Advisory Board. Join us to hear how leading brands across the world have achieved tremendous return on investment through their Oracle Real-Time Decisions deployments and do not miss this unique opportunity to ask them specific questions directly during our customer roundtable. Please share this information with anyone interested in real-time decision management and cross-channel predictive process optimization http://www.oracle.com/goto/RealTimeDecisions Nicolas Bonnet / Senior Director Product Management / Oracle Business Intelligence

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  • Enabling Attachments in Oracle Forms

    - by Manoj Madhusoodanan
    In this blog I will demonstrate how we can enable attachments in Oracle Form. The user ask is to capture a job description which will be along text. Oracle Apps has a feature called attachments, through some easy setup we can enable attachments in forms. We will be going to addresscustomer ask through this feature. Step 1 : Identify Form Name First thing you have to do is to identify the form to enable attachment. In this scenario form will be PERWSDJT ( Job form in HRMS ). Step 2 :  Identify Document Entity exists or not. If exists then do nothing otherwise create new. Step 3 : Create Document Categories. Here I will create a category Job Description with Default Data Type Long Text and Application Human Resources.Onceit is done I will assign this to Create Job form. Step: 3 Query Attachment Functions for PERWSDJT. Click on Categories and add Job Description.Make sure enabled check box is checked. v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} Normal 0 false false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 /* 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-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0in; line-height:115%; 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;} Step 4 : Turn off HR:Use Standard Attachments profile option. Output Go to Work Structures > Job > Description

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  • SQL in the City - Chicago 2012

    A free day of training in Chicago on Oct 5, 2012. Join Grant Fritchey, Steve Jones and more to discuss, debate, ask questions, and learn about how to better run your organizations SQL Servers. Are you sure you can restore your backups? Run full restore + DBCC CHECKDB quickly and easily with SQL Backup Pro's new automated verification. Check for corruption and prepare for when disaster strikes. Try it now.

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  • Interviewing Process (using blank paper etc)

    - by MJH
    I am curious to know why do companies hand you a blank paper and ask you to write code? This confuses me, because these days intellisense, google, stackoverflow etc are common sources to look up syntax and / or IDE gives you a colored indicator if your syntax is wrong. I usually get stressed out during these situations. I am curious to know opinions of other developers. I am posting this on this forum, hoping to get helpful feedback from other experienced developers.

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  • Tell Us What YOU Need To Know

    - by Harold Green
    We're continuing to develop new Exam Preparation Seminars, and we want to know -- what is a technical question you would like an instructor to address in the video? What is a weak point you need help with? What is a specific topic you would really like us to focus on in the video seminar? Visit our web survey (BELOW) to pose your questions to our instructors. We'll address as many questions as we can, focusing on the most relevant and most popular questions. ASK HERE

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