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  • On Comparing Tables in SQL Server

    How do you compare two SQL tables? Every SQL Developer or DBA knows the answer, which is 'it depends'. It is not just the size of the table or the type of data in it but what you want to achieve. Phil Factor sets about to cover the basics and point out some snags and advantages to the various techniques. FREE eBook – "45 Database Performance Tips for Developers"Improve your database performance with 45 tips from SQL Server MVPs and industry experts. Get the eBook here.

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  • Distributed cache and improvement

    - by philipl
    Have this question from interview: Web Service function given x static HashMap map (singleton created) if (!map.containsKey(x)) { perform some function to retrieve result y map.put(x, y); } return y; The interviewer asked general question such as what is wrong with this distributed cache implementation. Then asked how to improve on it, due to distributed servers will have different cached key pairs in the map. There are simple mistakes to be pointed out about synchronization and key object, but what really startled me was that this guy thinks that moving to database implementation solves the problem that different servers will have different map content, i.e., the situation when value x is not on server A but on server B, therefore redundant data has to be retrieved in server A. Does his thinking make any sense? (As I understand this is the basic cons for distributed cache against database model, seems he does not understand it at all) What is the typical solution for the cache growth issue (weak reference?) and sync issue (do not know which server has the key already cached - use load balancing)? Thanks

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  • MySQL documentation writer wanted

    - by stefanhinz
    As MySQL is thriving and growing, we're looking for an experienced technical writer located in Europe or North America to join the MySQL documentation team.For this job, we need the best and most dedicated people around. You will be part of a geographically distributed documentation team responsible for the technical documentation of all MySQL products. Team members are expected to work independently, requiring discipline and excellent time-management skills as well as the technical facilities to communicate across the Internet.Candidates should be prepared to work intensively with our engineers and support personnel. The overall team is highly distributed across different geographies and time zones. Our source format is DocBook XML. We're not just writing documentation, but also handling publication. This means you should be familiar with DocBook, and willing to learn our publication infrastructure.Candidates should therefore be interested not just in writing but also in the technical aspects of publishing documentation. Regarding your initial areas of authoring, those would be MySQL Cluster, MySQL Enterprise Monitor and Backup, and various parts of the MySQL server documentation (also known as the MySQL Reference Manual). This means you should be familiar with MySQL in general, and preferably also with MySQL Cluster and the MySQL Enterprise offerings.Other qualifications: Native English speaker 3 or more years previous experience in writing software documentation Excellent written and oral communication skills Ability to provide (online) samples of your work, e.g. books or articles Curiosity to learn new technologies Familiarity with distributed working environments and versioning systems such as SVN Comfortable with working on multiple operating systems, particularly Windows, Mac OS X, and Linux Ability to administer own workstations and test environment If you're interested, contact me under [email protected].

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  • Mview??????????????~BI/DWH????????(3)

    - by Yusuke.Yamamoto
    Oracle Database ???BI???????????????????????????????????????????????????????????????????????????????????? ?????????????·???(Mview)???????????!????????????? ??????????(08:12)????????????? BI???????????? Enterprise Manager ??SQL??????????????????????? Enterprise Manager ??SQL????·??????????? ????????????????????·???????????? ?????·??????????? BI????????????(Oracle Database ??????·?????????????Mview???) Enterprise Manager ?????????????????? ??????????????Oracle GRID Center ??????????????? ????????????????????????? ????????DWH????????????????·???????? ???? ????????·???(Mview/????????)|??????????? Oracle Enterprise Manager|??????????? DWH(?????????)??·??

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  • How to correctly write an installation or setup document

    - by UmNyobe
    I just joined a small start-up as a software engineer after graduation. The start-up is 4 year old, and I am working with the CEO and the COO, even if there are some people abroad. Basically they both used to do almost everything. I am currently on some kind of training phase. I have at my disposition architecture, setup and installation internal documentation. Architecture documentation is like a bible and should contain complete information. The rest are used to give directions in different processes. The issue is that these documents are more or less dated, as they just didn't have the time to change them. I will be in charge of training the next hires, and updating these documents is part of my training. In some there is a lot of hard-coded information like: Install this_module_which_still_exists cd this_dir_name_changed cp this_file_name_changed other_dir_name_changed ./config_script.sh ./execute_script.sh The issues i have faced : Either the module installation is completely different (for instance now there is an rpm, or a different OS) Either names changed, and i need to switch old names by new names Description of the purpose of the current step missing. Information about a whole topic is missing Fortunately these guys are around and I get all the information I want and all the explanations I need. I want to bring a design to the next documents so in the future people don't feel like they are completely rewriting a document each time they are updating it. Do you have suggestions? If there is a lightweight design methodology available online you can point me to it's nice too. One thing I will do for sure is set up a versioning repository for the documents alone. There is already one for the source code so I don't know why internal documents deserve a different treatment.

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  • How to build list of items available in World of Warcraft?

    - by Cyclops
    There are a number of non-Blizzard sites that show a complete list of available items in World of Warcraft (such as wowhead, etc). I would like to know the best (easiest) way to compile a similar list. I believe some sites are based on user-entered input, which I would like to avoid. Looking at the lua API, it seems that there are functions to get a list of items, but it's not clear if I can just download everything (I remember a reference to throttling somewhere, can't find it now). Does anyone have code samples that would do this, or links to source? Also, Eve Online has made a database of items available (and I do mean SQL database file for download, not the Armory) - is there anything similar for Wow? I'm just looking for the names and stats, not the graphic icons.

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  • Multitenant Self-Service Provisioning Anwendung

    - by Ulrike Schwinn (DBA Community)
    Oracle Multitenant ist eine neue Datenbank-Architektur, die seit Oracle Database Version 12c zur Verfügung steht. Konsolidierungen, schnelles und vereinfachtes Patchen, Provisionieren und Klonen einer Umgebung sind nur einige Vorteile, die sich aus diesem neuen Konzept ergeben können. Die Idee dahinter ist, dass sich mehrere Datenbanken nicht nur Ressourcen wie Hauptspeicher und Hintergrundprozesse teilen, sondern auch eine gemeinsame Verwaltung ("many as one") möglich ist. Oracle Multitenant ist natürlich auch eine ideale Grundlage für "Database as a Service", weil damit eine neue Datenbank in kürzester Zeit erstellt werden. Daher steht seit September auf OTN der Download einer einfachen, intuitiven Weboberfläche für Multitenant Self-Service Provisioning zur Verfügung. Was steckt dahinter? Wie funktioniert die Installation? Welche Anwendungsmöglichkeiten gibt es? Diese Fragen und weitere Informationen sind Thema des aktuellen Tipps. Mehr Informationen dazu gibt es hier.

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  • Linux, GNU GCC, ld, version scripts and the ELF binary format -- How does it work? [closed]

    - by themoondothshine
    I'm trying to learn more about library versioning in Linux and how to put it all to work. Here's the context: I have two versions of a dynamic library which expose the same set of interfaces, say libsome1.so and libsome2.so. An application is linked against libsome1.so. This application uses libdl.so to dynamically load another module, say libmagic.so. Now libmagic.so is linked against libsome2.so. Obviously, without using linker scripts to hide symbols in libmagic.so, at run-time all calls to interfaces in libsome2.so are resolved to libsome1.so. This can be confirmed by checking the value returned by libVersion() against the value of the macro LIB_VERSION. So I try next to compile and link libmagic.so with a linker script which hides all symbols except 3 which are defined in libmagic.so and are exported by it. This works... Or at least libVersion() and LIB_VERSION values match (and it reports version 2 not 1). However, when some data structures are serialized to disk, I noticed some corruption. In the application's directory if I delete libsome1.so and create a soft link in its place to point to libsome2.so, everything works as expected and the same corruption does not happen. I can't help but think that this may be caused due to some conflict in the run-time linker's resolution of symbols. I've tried many things, like trying to link libsome2.so so that all symbols are alised to symbol@@VER_2 (which I am still confused about because the command nm -CD libsome2.so still lists symbols as symbol and not symbol@@VER_2), but nothing seems to work. What am I doing wrong?

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  • 'ACT On' Middleware Consolidation and Innovation Program Launch Webcast Thursday June 5, 2014 - 10am BST / 11am CET / 12am EET

    - by Cinzia Mascanzoni
    We are launching a Demand Generation Program under the Oracle 'ACT On' brand to enable you to help your partners and customers benefit from one integrated Middleware stack to better address today's new IT Challenges. We will work with you to drive demand for your partners to deploy consolidated Middleware environments with one integrated red Stack from Database to Middleware solutions running on engineered systems like Oracle Database Appliance or Exalogic. The opportunity for VADs is to: Build on the strength of FMW which has a significant share of the total Oracle revenue in EMEA Sell more FMW licenses to existing customers Add Systems to deals to grow the value Join us on June 5th, 10am BST / 11am CET / 12am EETFor details on how to join, click here

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  • Amis Oracle OpenWorld Summary presentations

    - by JuergenKress
    AMIS Oracle OpenWorld 2013 Review Part 1 - Intro Overview Innovation, Hardware osvm, IAAS database. Watch the presentation here: AMIS Oracle OpenWorld 2013 Review Part 1 - Intro Overview Innovation, Hardware osvm, IAAS database AMIS Oracle OpenWorld 2013 Review Part 2 - Platform Middleware Publication AMIS Oracle OpenWorld 2013 Review Part 3 - Fusion Middleware 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: Amis,OOW,Oracle OpenWorld,WebLogic,WebLogic Community,Oracle,OPN,Jürgen Kress

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  • From the Coalface - 2 - Work as hard as you can to be as lazy as you can

    - by TATWORTH
    On one project, the standard build involved building the database from scratch producing a build log that was about 100,000 lines long.  Manually paging throught this log took hours and it was very easy to miss any errors. The solution was to write a filter that read the log file and output a summary file with each output line pepended with the line number in the original file. Sucessive iterations eliminated more noise lines. Diagnostic displays required escaping. The final output was just a few hundred lines long and the errors were easy to spot. The filter program took less time to to write than one manual pass reading the log file.  The utility digested the log file in about 1 second. Now database build errors could be identified quickly instead of after hours of manual examination or lengthy system testing. A few minutes consideration of the task led to a tremendous improvement in quality.

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  • Git Repo to mantain the app configurations in several servers

    - by user62904
    Hi! I need to versioning in a GIT repository, configurations of a particular platform, spread across multiple servers. Take into account that in each of these servers there are completely different configurations, while the application is the same. What is the best way to do this? Create a branch for each server repository.git:conf -- [branch Server 1] repository.git:conf -- [branch Server 2] repository.git:conf -- [branch Server N] Note: This method seems to me, that is difficult to maintain because each change in the server configurations, I need to create subbranches which becomes confusing. Create a single repo with a different directory for each server repository.git:conf/Server 1 repository.git:conf/Server 2 repository.git:conf/Server N Note: This is easy to mantain Create a repo for each server repository_1.git:conf repository_2.git:conf repository_N.git:conf Note: This method requires me to create a branch for each new server. There are other methods, what are the best practices in this case? Should I use the one that I feel most comfortable? Tks, Gulden PT

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  • Safest way (i.e. HTTPS, POST, PGP) to send decryption keys through the web?

    - by theGreenCabbage
    I am in the final stages of development for my Revit plugin. This plugin is programmed in C#, and distributed via a DLL. One of the DLLs is an encrypted SQLite database (with proprietary data) that is in the form of a DLL. Currently, in development stages, the decryption key for the SQLite database is hardcoded in my main DLL (the program's DLL). For distribution, since DLLs are easily decompilable, I am in need of a new method to decrypt the DLL. My solution is to send our decryption keys from our servers securely to the host's computer. I was looking in POST, thinking it was more secure than GET, but upon research, it appears it's similarly insecure, only more "obscure" than GET. I also looked into HTTPS, but Hostgator requires extra money for HTTPS use. I am in need of some advice - are there any custom solutions I can do to implement this?

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  • Organizing your Data Access Layer

    - by nighthawk457
    I am using Entity Framework as my ORM in an ASP.Net application. I have my database already created so ended up generating the entity model from it. What is a good way to organize files/classes in the data access layer. My entity framework model is in a class library and I was planning on adding additional classes per Entity(i.e per database table) and putting all the queries related to those tables in their respective classes. I am not sure if this is a right approach and if it is then where do the queries requiring data from multiple tables go? Am I completely wrong in organizing my files based on entities/tables and should I organize them based on functional areas instead.

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