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  • Big O, how do you calculate/approximate it?

    - by Sven
    Most people with a degree in CS will certainly know what Big O stands for. It helps us to measure how (in)efficient an algorithm really is and if you know in what category the problem you are trying to solve lays in you can figure out if it is still possible to squeeze out that little extra performance.* But I'm curious, how do you calculate or approximate the complexity of your algorithms? *: but as they say, don't overdo it, premature optimization is the root of all evil, and optimization without a justified cause should deserve that name as well.

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  • how to see the optimized code in c

    - by sganesh
    I can examine the optimization using profiler, size of the executable file and time to take for the execution. I can get the result of the optimization. But I have these questions, How to get the optimized C code. Which algorithm or method used by C to optimize a code. Thanks in advance.

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  • SQL Alter database failed - being used by checkpoint process

    - by Manjot
    Hi, On my SQL server 2008, i have a SQL agent job to restore a database on nightly basis. Procedure: find latest backup on other server Kill all conenction to the destination database Restore destination database with replace, recovery It failed last weekend because the database was being used by a system process (spid 11 checkpoint). since I couldnt kill the system process, I fixed this by restarting sql server. It failed this weekend as well with same error (checkpint process in this database as from sp_who) and when I run: SELECT session_id,request_id,command,status,start_time FROM sys.dm_exec_requests WHERE session_id = 11 It shows: 11 0 CHECKPOINT background 2010-04-06 10:17:49.103 I cant restart the server every time it fails. Can anyone please help me in fixing this? Thanks in advance Manjot

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  • Roundcube can't connect to PostgreSQL database

    - by kenny.r
    I'm trying to install Roundcube on a CentOS 5.5 server, with a PostgreSQL 8.1.22 database. The first page of the installer script, that checks for the presence of php libraries and such, gives me green OKs across the board. I even went out of my way to install the optional ones. Page two generates me two configuration files (main.inc.php and db.inc.php) which I put into place. Page three is where things go wrong: Check DB config DSN (write): NOT OK(MDB2 Error: connect failed) Make sure that the configured database exists and that the user has write privileges DSN: pgsql://roundcube:password@localhost/roundcubemail The info you see there (user roundcube, password password, server localhost and database roundcubemail) is all correct. The database roundcubemail belongs to the user roundcube and it has write permissions. I have no clue why it can't connect to that database. I'm managing it with phpPgAdmin, which is running on the very same Apache, on the same server!

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  • database on SSD: data only or the DBM program too?

    - by simone
    I plan on moving the data I use for statistical analysis (100-ish Gb) onto an SSD. The data is either sqlite single-file db's, or postgresql-managed data. The SSD is 240 Gb, 550 MB/s read and 520 MB/s write. Should I reserve that space for the data only, or would it be a good idea to install the operating system (Mac OS X) and the application directory (Adobe Suite, Microsoft Office and the like) on the SSD too? And would it make a substantial speed difference whether I also install the postgresql binaries on the SSD? I have plenty of other space (another 300Gb hard-drive, and a 1Tb one). Don't know the features of the non-SSD drives, though they're our standard equipment on all Macs, and they're definitely OK. Thanks.

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  • Issue with Exchange 2010 and Removing a Mailbox Database

    - by ThaKidd
    I did a 2003 to 2010 transition and everything is working well. During the 2010 install, a database was copied over with a random number at the end. I found out and moved three system mailboxes out of it into the database that all of the client accounts are in. I used the EMS to move those mailboxes to the other store then used the EMC to remove the mailbox database. Problem is, I am getting an error every few hours in event viewer now complaining about this database. Error is: MSExchageRepl - 4098 The Microsoft Exchange Replication service couldn't find a valid configuration for database '5f012f40-3bad-4003-a373-dbc0ffb6736f' on server 'SERVER'. Error: (nothing reported after this) Does anyone know how to fix this issue? In advance, I appreciate your help and thx for your valuable input!

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  • Are there any reasons to duplicate table in the same database ?

    - by bob
    Let says we have several MySQL server, one master and some slaves. A member table which contains more than 5.000.000 peoples. Are there any reasons (performance, atomicity, etc..) to use duplicate tables like member_1, member_2, member_3 and then switch randomly when doing operation on it ? (especialy SELECT query) ?

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  • Moving the Windows Workflow database: safe enough?

    - by Chris
    We have a Windows Workflow service that is running in the IIS context and persisting to a database in between hydrates. It has the Tracking Service turned on, as well. We're looking to move the database to another server, and I wanted to make sure there are no gotchas in doing so. My current plan would just be to spin down IIS to stop all activity, back up the database, migrate the database, then flip connection strings in my application to point to the new one. My main concern was if existing workflows somehow need to stay on the same database or not, or if some activity needs to happen for them to work after the move. I wouldn't think so, but just planning ahead.

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  • Troubleshooting a slow database server with no load

    - by user1721724
    I'm getting ready to soft launch my website and I've run into some problems with what I think is being caused by my MySQL database running on Fedora. All websites run fine, just as I'd expect, but any pages that establish a database connection hang until the connection is established, and then bang, the site loads as it should. Ex. My landing page (http://www.thrusong.com) doesn't make a database connection and loads quickly. User profile pages (http://www.thrusong.com/john) make a database connection and load slowly, even though most of the data comes from memcached and the database currently has no load on it. This problem just came up yesterday when my router died and I began using my Pace 2Wire modem with built-in router. Before, my old router was set to handle everything. My ISP says the settings in the modem are correct. Any ideas? Thanks in advance.

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  • Why database partitioning didn't work? Extract from thedailywtf.com

    - by questzen
    Original link. http://thedailywtf.com/Articles/The-Certified-DBA.aspx. Article summary: The DBA suggests an approach involving rigorous partitioning, 10 partitions per disk (3 actual disks and 3 raid). The stats show that the performance is non-optimal. Then the DBA suggests an alternative of 1 partition per disk (with more added disks). This also fails. The sys-admin then sets up a single disk, single partition and saves the day. The size of disks was not mentioned but given today,s typical disk sizes (of the order of 100 GB), the partitions ; would be huge, it surprises me that a single disk with all partitions outperformed. Initially I suspect that the data was segregated and hence faster reads. But how come the performance didn't degrade as time went by with all the inserts and updates happening? Saw this on reddit, but the explanation was by far spindle/platter centered. There was no mention in the article about this. Is there any other reason? I can only guess that the tables were using a incorrect hash distribution causing non-uniform allocation across disks (wrong partitioning); this would increase fetch times. Any thoughts?

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  • Access denied for user 'diduser'@'localhost' to database 'diddata' (1044, 42000)

    - by Arlen Beiler
    I am trying to setup a MySQL server and when I went to create a second user it wouldn't give it permissions for the database. I can connect fine as long as I don't specify a database. Access denied for user 'user'@'localhost' to database 'diddata' The connection details are: { 'host' : 'localhost', 'user' : 'user', 'password' : 'password' , 'database': 'diddata' }; And to create the DB and table I did: CREATE DATABASE IF NOT exists diddata; CREATE USER 'user'@'localhost' IDENTIFIED BY 'password'; GRANT ALL ON user.* TO 'user'@'localhost'; Note that I've changed the username and password in this question. I've already checked the privileges in MySQL workbench and they are there.

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  • What is the easiest way to apply database functionality into my daily life?

    - by Daddy Warbox
    let me try to explain it by listing some of the things I want to do: Submit random thoughts, notes, facts, and to-do tasks of any sort and at any time. Tag each of these submissions freely. Manage these tags centrally. Associate meta-data with submissions and tags. Search, filter, and sort submissions. I want lots of power here. Display views of submissions (including within searches) in a hierarchy. Create said hierarchies easily out by ordering relevant tags. I'm thinking towards some kind of desktop program that allows me to quickly do all of these things. A web service could also work, too, but it will need offline capabilities. I don't want to have to pay for this, if that's possible. Also, as I know regex and SQL, I wouldn't mind solutions involving the use of either.

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  • Should we regularly schedule mysqlcheck (or databsae optimization)

    - by scatteredbomb
    We run a forum with some 2 million posts and I've noticed that if left untouched the overhead in the mySQL (as listed in phpMyAdmin) can get quite large (hundreds of megabytes). I'm wondering if scheduling a normal mysqlcheck to optimize the tables is good practice? Any reason not to do it, say, once a week at an off-peak hour? There was a time over the summer where our site was constantly crashing because mysql was using up all resources. That's when I noticed the huge amount of overhead and optimized the database and haven't had any problems since then with stability. I figured if that was helping alleviate the issues, I should just setup a cron to automatically do this.

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  • LLBLGen Pro v3.0 with Entity Framework v4.0 (12m video)

    - by FransBouma
    Today I recorded a video in which I illustrate some of the database-first functionality available in LLBLGen Pro v3.0. LLBLGen Pro v3.0 also supports model-first functionality, which I hope to illustrate in an upcoming video. LLBLGen Pro v3.0 is currently in beta and is scheduled to RTM some time in May 2010. It supports the following frameworks out of the box, with more scheduled to follow in the coming year: LLBLGen Pro RTL (our own o/r mapper framework), Linq to Sql, NHibernate and Entity Framework (v1 and v4). The video I linked to below illustrates the creation of an entity model for Entity Framework v4, by reverse engineering the SQL Server 2008 example database 'AdventureWorks'. The following topics (among others) are included in the video: Abbreviation support (example: convert 'Qty' into 'Quantity' during name construction) Flexible, framework specific settings Attribute definitions for various elements (so no requirement for buddy-classes or messing with generated code or templates) Retrieval of relational model data from a database Reverse engineering of tables into entities, automatically placed in groups Auto-creation of inheritance hierarchies Refactoring of entity fields into Value Type Definitions (DDD) Mapping a Typed view onto a stored procedure resultset Creation of a Typed list (definition of a query with a projection) on a set of related entities Validation and correction of found inconsistencies and errors Generating code using one of the pre-defined presets Illustration of the code in vs.net 2010 It also gives a good overview of what it takes with LLBLGen Pro v3.0 to start from a new project, point it to a database, get an entity model, perform tweaks and validation and generate code which is ready to run. I am no video recording expert so there's no audio and some mouse movements might be a little too quickly. If that's the case, please pause the video. It's rather big (52MB). Click here to open the HTML page with the video (Flash). Opens in a new window. LLBLGen Pro v3.0 is currently in beta (available for v2.x customers) and scheduled to be released somewhere in May 2010.

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  • Why is TDD not working here?

    - by TobiMcNamobi
    I want to write a class A that has a method calculate(<params>). That method should calculate a value using database data. So I wrote a class Test_A for unit testing (TDD). The database access is done using another class which I have mocked with a class, let's call it Accessor_Mockup. Now, the TDD cycle requires me to add a test that fails and make the simplest changes to A so that the test passes. So I add data to Accessor_Mockup and call A.calculate with appropriate parameters. But why should A use the accessor class at all? It would be simpler (!) if the class just "knows" the values it could retrieve from the database. For every test I write I could introduce such a new value (or an if-branch or whatever). But wait ... TDD is more. There is the refactoring part. But that sounds to me like "OK, I can do this all with a big if-elseif construct. I could refactor it using a new class ... but instead I make use of the DB accessor and do this in a totally different way. The code will not necessarily look better afterwards but I know I WANT to use the database".

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  • Lösungen zum Anfassen – die Oracle Demo-Plattform

    - by A&C Redaktion
    Mit der neuen Demo-Plattform möchte Oracle den schnellen Zugang zu vorbereiteten Demo-Umgebungen anbieten. Denn manchmal sagt eine kurze Demonstration mehr, als tausend Erklärungsversuche. Oracle hat daher eine Demo-Plattform eingerichtet, auf der laufend neue Lösungen und Produkte anschaulich vorgeführt werden. Dabei geht es nicht um die theoretischen Möglichkeiten, sondern um ganz praktische Problemfälle – und wie diese bewältigt werden. Das aktuelle Thema ist Database Security am Beispiel der E-Business Suite – ein Thema, das so mancher Partner im Kundengespräch gut gebrauchen kann. In der folgenden Demo-Umgebung können Sie die Datenbank-Sicherheitsfunktionen wie die transparente Verschlüsselung von Applikationsdaten (hier am Beispiel E-Business Suite – es funktioniert aber auch mit SAP oder anderen Anwendungen) und das Rechtekonzept für Anwender und DBAs Ihren Kunden direkt vorstellen. In der Demo können Sie die Funktionalität von Oracle Database Vault, Oracle Advanced Security, Security Option und Oracle Label Security erläutern. Oracle Advanced Security Address Industry and Privacy Regulations with Encryption Protect Application Data with Transparent Data Encryption Encrypt Data on the Network Oracle Database Vault Increase Security For Data Consolidation and Out-Sourced Administration Protect Application Data with Privileged User Controls  Enforce Multi-factor Authorization and Separation of Duty Oracle Label Security Use Security Groups to control data access Assign OLS attributes to application, not necessarily database, users Jede Demo stellt Ihnen einen beispielhaften Demo-Guide zur Verfügung, an dem Sie sich orientieren können. Dies ist der direkte Weg zur Demo-Plattform, auf der Sie für Ihre eigenen Lernzwecke die Demo anschauen können sowie auch einen Zeitraum für Kundenpräsentationen reservieren können. 

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  • Delphi Client-Server Application using Firebird 2.5 error

    - by Japie Bosman
    I have got a lengthy question to ask. First of all Im still very new when it comes to Delphi programming and my experience has beem mostly developing small single user database applications using ADO and an Access database. I need to take the transition now to a client server application and this is where the problem starts. I decided to use Firebird 2.5 embeded as my database, as it is open source, and it is can be used with the interbase components in Delphi and that multiple clients can access the database simultanously. So I followed the interbase tutorial in Delphi. I managed to connect the client to the server and see the data in the example (While both are running on my pc), but when i tried to move the client to another pc, keeping the server on mine and running it to see if I can connect to the server it gave me the following error. Exception EIdSocketError in module clientDemo.exe at 0029DCAC. Socket Error # 10061 Connection refused. I understand that this might be because the host is defined as localhost in the client. But here is my first question. In the TSQLConncetion you can set die hostname under Driver-Hostname. The thing I want to know is how do you do this at run time, as I cannot get the property when I try and make an edit box to allow the user to enter the value and then set it via code like for example: SQLConncetion1.Driver.Hostname := edtHost.text; The thing is there is not such property to set, so how do you set the hostname at run time? Im using Delphi XE2 There is still a lot of questions to come especially when it comes to deployment, but I will take this piece by piece and I appreciate the advice.

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  • Prepared statement alternatives for this middle-man program?

    - by user2813274
    I have an program that is using a prepared statement to connect and write to a database working nicely, and now need to create a middle-man program to insert between this program and the database. This middle-man program will actually write to multiple databases and handle any errors and connection issues. I would like advice as to how to replicate the prepared statements such as to create minimal impact to the existing program, however I am not sure where to start. I have thought about creating a "SQL statement class" that mimics the prepared statement, only that seems silly. The existing program is in Java, although it's going to be networked anyways so I would be open to writing it in just about anything that would make sense. The databases are currently MySQL, although I would like to be open to changing the database type in the future. My main question is what should the interface for this program look like, and does doing this even make sense? A distributed DB would be the ideal solution, but they seem overly complex and expensive for my needs. I am hoping to replicate the main functionality of a distributed DB via this middle-man. I am not too familiar with sql-based servers distributing data (or database in general...) - perhaps I am fighting an uphill battle by trying to solve it via programming, but I would like to make an attempt at least.

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  • How to handle monetary values in PHP and MySql?

    - by Songo
    I've inherited a huge pile of legacy code written in PHP on top of a MySQL database. The thing I noticed is that the application uses doubles for storage and manipulation of data. Now I came across of numerous posts mentioning how double are not suited for monetary operations because of the rounding errors. However, I have yet to come across a complete solution to how monetary values should be handled in PHP code and stored in a MySQL database. Is there a best practice when it comes to handling money specifically in PHP? Things I'm looking for are: How should the data be stored in the database? column type? size? How should the data be handling in normal addition, subtraction. multiplication or division? When should I round the values? How much rounding is acceptable if any? Is there a difference between handling large monetary values and low ones? Note: A VERY simplified sample code of how I might encounter money values in everyday life: $a= $_POST['price_in_dollars']; //-->(ex: 25.06) will be read as a string should it be cast to double? $b= $_POST['discount_rate'];//-->(ex: 0.35) value will always be less than 1 $valueToBeStored= $a * $b; //--> any hint here is welcomed $valueFromDatabase= $row['price']; //--> price column in database could be double, decimal,...etc. $priceToPrint=$valueFromDatabase * 0.25; //again cast needed or not? I hope you use this sample code as a means to bring out more use cases and not to take it literally of course. Bonus Question If I'm to use an ORM such as Doctrine or PROPEL, how different will it be to use money in my code.

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  • Is it possible to run Visual Studio Database Edition schema migrations from the command line?

    - by Damian Powell
    Visual Studio 2008 Database Edition (Data Dude) has the ability to perform schema comparisons between databases and generate a script which migrates from one database to the other. Is it possible to perform this comparison and generate the migration script from the command line? If so, what are the command line tools, and are the same tools used in equivalent versions of Visual Studio 2010?

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  • How to do a database backup in DB2 in Vista?

    - by Daziplqa
    How to do a database backup in DB2 in Vista? Whenever I issued this command (login in Vista as Administrator): restore database myDB from D: taken at 20081013134446 the command line processor return the following error message: SQL1092N "ADMINISTRATOR" does not have the authority to perform the requested command. SQLSTATE=00000 So, How can I solve this problem?

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  • how to design a database for a specific website.

    - by Steven Spielberg
    i want to design a Database for a website. how i can design it better. are you know any particular thing, tips , technique to design it in better way. in a table of information user can allow to website to show it or hide it. how can i do this like info1 = show info2 = show info3 = show i have a much more field that user can be showed and hide. how i can handle this situation or condition in Database

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