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  • flat files vs. RDBMS database, few read/writes, few changes

    - by Bob Lapique
    I have to handle data from long term (years, decades) climate monitoring stations. The data flow usually starts with raw data (voltages, etc.) plus quality check information (pressure, temperature, flow rate, etc.) generally recorded @ 1Hz. Then, the data are assigned a quality flag (human and/or program), processed (apply calibration curves) and flagged. So, we basically end up with 2 datasets : raw and processed data. New data are typically added once a day (~500Ko/day/instrument). Simultaneous queries are not likely to ever happen. I wanted to go for a RDBMS (we have a MySQL server) and have some experience in database design, but the IT guy keeps telling me that flat files will to the job just as well. I suspect him to try to make his life easier when it comes to backup/upgrade the MySQL. There are not so many links between data, they don't change much, but the quality flags will change. A RDBMS is easier to compare data from different instruments on a "many days" scale, compared to daily text files. Well, what would you advise ? Thanks.

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  • You may be tempted by IaaS, but you should PaaS on that or your database cloud journey will be a short one

    - by B R Clouse
    Before we examine Consolidation, the next step in the journey to cloud, let's take a short detour to address a critical choice you will face at the outset of your journey: whether to deploy your databases in virtual machines or not. A common misconception we've encountered is the belief that moving to cloud computing can be accomplished by simply hosting one's current operating environment as-is within virtual machines, and then stacking those VMs together in a consolidated environment.  This solution is often described as "Infrastructure as a Service" (IaaS) because the building block for deployments is a VM, which behaves like a full complement of infrastructure.  This approach is easy to understand and may feel like a good first step, but it won't take your databases very far in the journey to cloud computing.  In fact, if you follow the IaaS fork in the road, your journey will end quickly, without realizing the full benefits of cloud computing.  The better option to is to rationalize the deployment stack so that VMs are needed only for exceptional cases.  By settling on a standard operating system and patch level, you create an infrastructure that potentially all of your databases can share.  Now, the building block will be database instances or possibly schemas within databases.  These components are the platforms on which you will deploy workloads, hence this is known as "Platform as a Service" (PaaS). PaaS opens the door to higher degrees of consolidation than IaaS, because with PaaS you will not need to accommodate the footprint (operating system, hypervisor, processes, ...) that each VM brings with it.  You will also reduce your maintenance overheard if you move forward without the VMs and their O/Ses to patch and monitor.  So while IaaS simply shuffles complex and varied environments into VMs,  PaaS actually reduces complexity by rationalizing to the small possible set of components.  Now we're ready to look at the consolidation options that PaaS provides -- in our next blog posting.

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  • Am I missing something about these considerations about Leaderboard's database's schema?

    - by misiMe
    I just finished to develop a mobile game, now I want to implement an online leaerboard using mysql. I'm wondering about the database's schema, I thought about some possibilities: (I didn't got in detail with syntax because my question is just about the logic of it) Name: string; Score: integer I thought to ask the name just the first time. If, in the future, you will modify that, it will call just an update to the name associated with your id. Leaderboard(ID, Name, Score) ID: integer autoincrement, PrimaryKey With this kind of idea maybe the db will grow fast because if you choose everytime a different name for the score, it will add a new entry. Leaderboard(PhoneId, Name, Score) Here PhoneId will be the unique identifier of the phone, PrimaryKey. A con of this choice is that if you want to play with your friends' phone, you can't put a different name for the score. Leaderboard(Name, Score) Here Name is PrimaryKey. With that, if you enter a name that already exists, you will be prompted to choose another one. Do you agree with this considerations? What will you do? Am I missing something?

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  • Do cross reference database tables have a place in domain driven design?

    - by Mike Cellini
    First some background. Let's say we have a system where a customer is placing an order in a web interface. The items that customer is ordering can priced in various ways. Sometimes including the cost of delivery and sometimes not at all. That pricing effectively depends on a variety of factors including the vendor's own pricing model, that vendor's individual contracts with customers as well as that vendor's contracts with its own suppliers. Let's assume that once a customer places an order for a particular item and chooses a contract if any, the method of delivery can be determined by variables on those contracts. Those delivery methods also live in their own table in the database and have various properties consumed downstream. It makes sense that a cross reference or lookup table would store that information. That table would be loaded into the domain and could then be used to apply the appropriate delivery method while processing the order. Does this make sense in the context of domain driven design? Or is my thinking too relational? Is this logic that should be built into it's own class/method (I mean beyond apply the cross reference table data)?

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  • The imported project "C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v10.0\SSDT\Microsoft.Data.Tools.Schema.SqlTasks.targets" was not found. Confirm that the path in the <Import> declaration is correct, and that the file exists on di

    - by simonsabin
    Are you trying to build a SQL Server database project and getting   The imported project "C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v10.0\SSDT\Microsoft.Data.Tools.Schema.SqlTasks.targets" was not found. Confirm that the path in the <Import> declaration is correct, and that the file exists on disk. We had this recently when trying to build one SSDT solution but not when building another.   Checking the build agent the error was correct that file didn’t exist...(read more)

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  • How to update correctly an Entity Model after changes of database structure?

    - by Slauma
    I've made some changes in the table structure and especially the relationships between tables in my SQL Server database. Now I want to update my Entity model based on this new database structure. Right clicking on the edmx file I find the option "Update model from database". But when I do this I get kind of a 50% update: The new columns appear in the Entity classes but I am confused about a lot of navigation properties which are still there in the model although the corresponding foreign key relationships do not exist anymore in the database. Am I doing something wrong? Or is there another option to update the model including deletion of navigation properties? Or do I have to delete those navigation properties manually in the model files? I am using Entity Framework Version 1 (VS 2008 SP1). Thanks for help in advance!

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  • How to start an iPhone 3.1.3 project in Xcode 3.2.3 (iPhone SDK 4 beta)

    - by Zordid
    Hi there! I am having big problems since I downloaded the beta version of iPhone SDK 4.0. Okay, I just started to look at iPhone development a few weeks ago, but I cannot figure out how Xcode is supposed to work: whenever I start a new project, I choose a template like "View-based application" or so. Now, the target will always (at least I did not find a preference anywhere!) be the latest SDK: 4.0. But then: switching the target back to, say, 3.1.3 the template files seem to contain errors! Starting an empty application this way yields an exception: Terminating app due to uncaught exception 'NSUnknownKeyException', reason: [...] this class is not key value coding-compliant for the key rootViewController sick Now, my (stupid) question: How do I develop an application NOT targeting the latest SDK, but the standard 3.1.3 SDK?? In other words: I would expect Xcode not only to ask for a project type in the New Project window, but also for my desired target!! Am I right that the templates generated with this step are not valid for any other target than 4.0? How can that be?? ...I want my Eclipse back! sigh Can anybody help me please?

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  • Connecting to sql server database mdf file without installing sql server on client machine ?

    - by Shantanu Gupta
    I am creating a window application that need to use sql server database. I want to install this application to client machine without installing sql server so that my application can still connect to a database i.e mdf file that i will be providing at client system. How can i connect to a database(mdf) on client machine through my window application without installing sql server. ? I dont know is it possible or not. If possible what will be the connection string in that case. Database need not be used in network. Client mahine dont need any installation. Every thing needs to be run through pen drive

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  • How to estimate the contribution of an individual to a software project?

    - by Amit Kumar
    I work on a software project and would like to estimate the percentage out of the total contribution that I have put in the development of the software. Is there some tool doing this? Such a tool can be useful for appraisals or negotiations, for example. After all, we work for money (yes, not only money, put the point remains). I think there is enough hand-waving for the most important things. The estimation is very subjective (at least to me now) but I do not know of any tool that provides even a subjective estimate. I know of Sloccount that spells out the total effort using the lines of code but not on per-developer basis. My idea of an ideal tool for this purpose would: measure the complexity of the code (more complex is more effort, but more effort is not necessarily more contribution) measure the decomposibility/flexibility of the software (more decomposable is better) how much library code is used -- using library code speeds up the development process, increases the associated risk and requires the developer to know from before or learn about the library. be intelligent enough to differentiate between "who wrote the code", "who copied the code" and "who indented the code". It is difficult to differentiate between the complexity in the implementation and the intrinsic complexity of the problem. Perhaps a comparison can be made with an equivalent open source counterpart if there is, or for each submodule separately. If there is no such tool, is there no merit in having such a tool? Or do you believe in "I do work, I do not measure"? It takes time after all. Perhaps the project manager should do this estimation continuously, say, weekly. Are there any standards? Yes, standardization is difficult because every project has a different goal, but difficult does not mean it is not useful.

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  • Pyramid.security: Is getting user info from a database with unauthenticated_userid(request) really secure?

    - by yourfriendzak
    I'm trying to make an accesible cache of user data using Pyramid doc's "Making A “User Object” Available as a Request Attribute" example. They're using this code to return a user object to set_request_property: from pyramid.security import unauthenticated_userid def get_user(request): # the below line is just an example, use your own method of # accessing a database connection here (this could even be another # request property such as request.db, implemented using this same # pattern). dbconn = request.registry.settings['dbconn'] userid = unauthenticated_userid(request) if userid is not None: # this should return None if the user doesn't exist # in the database return dbconn['users'].query({'id':userid}) I don't understand why they're using unauthenticated_userid(request) to lookup user info from the database...isn't that insecure? That means that user might not be logged in, so why are you using that ID to get there private info from the database? Shouldn't userid = authenticated_userid(request) be used instead to make sure the user is logged in? What's the advantage of using unauthenticated_userid(request)? Please help me understand what's going on here.

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  • How to restore a file system level copy of a PostgreSQL database (not dump) to a different PC

    - by user782224
    I am new to PostgreSQL. I have to recover a database which was running in widows XP machine. I have the zip folder of postgres. I have extracted postgres installation in a different PC and started a using initDB and created a new database, I was able to login, but I am not able to see any old tables. Would you please post the steps you have used to start server in another windows XP machine and how to recover tables and data in the old data folder?

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  • Is it possible to use ActiveObjects (or another ORM) with an embedded database & JWS technology ?

    - by phmr
    I would like to embed a database in my JWS application. As a matter of fact I have to use HSQL or SQLite. Hibernate may support (HSQL or SQLite, does it ?) but the workflow is rather complex for my application but maybe it's the way to go for my needs. In ActiveObjects database shoould be "linked" to by a path because of JDBC, but is it possible to specify a database that is inside a JAR and how ?

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  • SQL server 2005 - user rights

    - by Paresh
    I have created one user named "tuser" with create database rights in SQL server 2005. and given the 'db_owner' database role of master and msdb database to "tuser". From this user login when I run the script for create database then it will create new database. But "tuser" don't have access that newly created database generated from script. Any one have any idea?, I want to write the script so "tuser" have access that new created database after creation and can have add user permission of newly created database. I want to give 'db_owner' database roles to "tuser" on that newly created database in the same script which create new database. The script run under 'tuser'.

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  • How do I switch to a SQL Server Server Database that will exist after another command?

    - by Jason Young
    I can't get this script to run, because SQL management studio 2008 says the table "NewName" does not exist. However, the script's purpose is to rename an existing database, so that it does exist when it gets to that line. Ideas? Use Master; ALTER DATABASE OldName SET SINGLE_USER WITH NO_WAIT; ALTER DATABASE OldName MODIFY NAME = NewName; ALTER DATABASE NewName SET MULTI_USER; Use NewName; --THIS LINE FAILS BEFORE THE SCRIPT EVEN RUNS!

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  • I'm trying to display records from a database and then when a new one is added automatically update

    - by Pete
    I'm trying to display records from a database and then when a new one is added automatically update the displayed records from the database with the new one I am doing this using php and javascript. I want to load a page and display tags under a video and then when a user adds a new tag by entering it into text box to add it to the database and then refresh the part of the page which shows these tags and include the new one which has just been added all without the page being reloaded. Thanks in advance for any help

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  • How to convert lots of database file from MSSQL 2000 to MSSQL 2005?

    - by Tech
    Hi all, I am moving the SQL Server from MSSQL 2000 to MSSQL 2005, and I found the article in the web like this: http://www.aspfree.com/c/a/MS-SQL-Server/Moving-Data-from-SQL-Server-2000-to-SQL-Server-2005/ It works, but the problem is, it only move database one by one. Because I have so many database, is there any easy way to do so? or is there provides any batches / untitlty allow me to do so? thz u.

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  • TFS Folders - Getting them to work like Subversion "Trunk/Tags/Branches"

    - by Sam Schutte
    I recently started using Team Foundation Server, and am having some trouble getting it to work the way I want it to. I've used Subversion for a couple years now, and love the way it works. I always set up three folders under each project, Trunk, Tags, and Branches. When I'm working on a project, all my code lives under a folder called "C:\dev\projectname". This "projectname" folder can be made to point to either trunk, or any of the branches or tags using Subversion (with the switch command). Now that I'm using TFS (my client's system), I'd like things to work the same way. I created a "Trunk" folder with my project in it, and mapped "Project/Trunk/Website" to "c:\dev\Website". Now, I want to make a release under the "tags" folder (located in "Project/Tags/Version 1.0/Website", and TFS is giving me the following error when I execute the branch command: "No appropriate mapping exists for $Project/tags/Version 1.0/Website" From what I can find on the internet, TFS expects you to have a mapping to your hard drive at the root of the project (the "Project" folder in my case), and then have all the source code that lives in trunk, tags and branches all pulled down to your hard drive. This sucks because it requires way too much stuff on your hard drive, and even worse, when you are working in a solution in Visual Studio, you won't be able to pull down "Version 2.0" and have all your project references to other projects work, because they'll all be pointing to "trunk" folders under the main folder, not just the main folder itself. What I want to do is have the root "Project/Website" folder on my hard drive, and be able to have it point to (mapped to) either tags, branches, or trunk, depending on what i'm doing, without having to screw around with fixing Visual Studio project references. Ideas?

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  • Keeping a database structure up to date in a project where code is on subversion?

    - by Bruno De Barros
    I have been working with Subversion for a while now, and it's been incredible for the management of my projects, and even to help managing the deployment to several different servers, but there is just the one thing that still annoys me. Whenever I make any changes to the database structure, I need to update every server manually, I have to keep track of any changes I made, and because some of my servers run branches of the project (modifications that are still being worked on, or were made for different purposes), it's a bit awkward. Until now, I've been using a "database.sql" file, which is a dump of the database structure for a specific revision. But it just seems like such a bad way to manage this. And I was wondering, how does everyone else manage their MySQL databases when they're working on a project and using Subversion?

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  • Django + Virtualenv: manage.py commands fail with ImportError of project name.

    - by Bartek
    This is blowing my mind because it's probably an easy solution, but I can't figure out what could be causing this. So I have a new dev box and am setting everything up. I installed virtualenv, created a new environment for my project under ~/.virtualenvs/projectname Then, I cloned my project from github into my projects directory. Nothing fancy here. There are no .pyc files sitting around so it's a clean slate of code. Then, I activated my virtualenv and installed Django via pip. All looks good so far. Then, I run python manage.py syncdb within my project dir. This is where I get confused: ImportError: No module named projectname So I figured I may have had some references of projectname within my code. So I grep (ack, actually) through my code base and I find nothing of the sorts. So now I'm at a loss, given this environment why am I getting an ImportError on a module named projectname that isn't referenced anywhere in my code? I look forward to a solution .. thanks guys!

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  • How can I get back my privilege to create a new database in MySQL?

    - by Steven
    I can not use MySQL. MySQL is on my local computer. Currently I added skip-grant-tables in My.ini so I can use MySQL. But I have no privilege to create a new database. My problem is tough, although I asked related questions on SO, but no answer can resolve my problem. I almost give up. So I lower my expectation. I am developing a website, so I need to create database, tables and operate tables. You don't have to consider security. Is there a simple solution that can give me privilege to create a new database? Maybe by adding some command in my.ini or something? You won't need to completely resolve my problem. Maybe after the development, I will upload the database and tables to another server(The current database server is my personal computer, windows XP) so I can uninstall and reinstall MySQL. The root of problem is that I lack privileges.

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