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• SimpleDB as Denormalized DB

  - by Max

  In an environment where you have a relational database which handles all business transactions is it a good idea to utilise SimpleDB for all data queries to have faster and more lightweight search? So the master data storage would be a relational DB which is "replicated"/"transformed" into SimpleDB to provide very fast read only queries since no JOINS and complicated subselects are needed.

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• Possible to lock attribute write access by Doors User?

  - by Philip Nguyen

  Is it possible to programmatically lock certain attributes based on the user? So certain attributes can be written to by User2 and certain attributes cannot be written to by User2. However, User1 may have write access to all attributes. What is the most efficient way of accomplishing this? I have to worry about not taking up too many computational resources, as I would like this to be able to work on quite large modules.

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• How do I select a random record efficiently in MySQL?

  - by user198729

  mysql> EXPLAIN SELECT * FROM urls ORDER BY RAND() LIMIT 1; +----+-------------+-------+------+---------------+------+---------+------+-------+---------------------------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+-------+------+---------------+------+---------+------+-------+---------------------------------+ | 1 | SIMPLE | urls | ALL | NULL | NULL | NULL | NULL | 62228 | Using temporary; Using filesort | +----+-------------+-------+------+---------------+------+---------+------+-------+---------------------------------+ The above doesn't qualify as efficient,how should I do it properly?

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• Linking two pages using JSP

  - by jamesatha

  So, I am trying to use JSP to create a set of webpages. I want to link two pages so that if the user clicks a button in one page, it will trigger an event in the other page. Is there an efficient way to do this? I was taking a look at creating cookies and/or sessions. Any suggestions on these two methods? Thanks

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• Web Parts custom property not showing up

  - by Morri

  I'm trying to create a custom property for my web part, but can't get it to show up in Sharepoint. Here's my current code : [Serializable] [XmlRoot(Namespace = "MyWebPart")] [DefaultProperty("Text")] public class MyWebPart : WebPart { ... [Category("My Web Parts Properties")] [DefaultValue(defaultPropertyValue)] [WebPartStorage(Storage.Shared)] [FriendlyNameAttribute("Property name")] [Description("Longer desc for my property")] [Browsable(true)] [XmlElement(ElementName = "SomeProperty")] public string SomeProperty { get { return someProperty; } set { someProperty = value; } } Is there something else required to get custom properties working?

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• xslt + javascript -> a full functional small scale web site?

  - by user311884

  is it possible to build a full functional, small scaled website, without java or python or perl or php? and with xml files as simple data storage? therefore, i can move my website any where I want..... any experiences like this to share? thanks.

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• jQuery - Why is "live" inefficient? And how can we measure that?

  - by ming yeow

  why do programmers say that "live" is inefficient? So what are the alternative methods to replicating that function that are more efficient? How do we measure the impact of how much it slows things down?

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• NHibernate and reporting

  - by Paul Knopf

  I am building a website on top of nhibernate. Is there any efficient way to build reports? BY reports, I mean is there anyway to execute a complicated query that grabs random pieces of data? StoreProcedures? Hql? Can I get single, non mapped values from hql?

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• What should main() return in C/C++?

  - by Joel

  What way is the most efficient and why? int main()? void main()? return 1? return 0?

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• How to copy a file using Paperclip

  - by CalebHC

  Does anyone know of a way to copy files with Paperclip using S3 for storage? Before I try to write my own, I just wanted to make sure there wasn't already a way to do this. Speaking of copying, is there an easier way of copying a whole model including all of its has_many relationships? Sorry for the second question but it kind of fits! :) Thanks

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• Rails 2.3: How to turn this SQL statement into a named_scope

  - by randombits

  Having a bit of difficulty figuring out how to create a named_scope from this SQL query: select * from foo where id NOT IN (select foo_id from bar) AND foo.category = ? ORDER BY RAND() LIMIT 1; Category should be variable to change. What's the most efficient way the named_scope can be written for the problem above?

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• Javascript for loop efficiency

  - by Misha Moroshko

  Is for (var i=0, cols=columns.length; i<cols; i++) { ... } more efficient than for (var i=0; i<columns.length; i++) { ... } ? In the second variant, is columns.length calculated each time the condition i<columns.length is checked ?

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• Should I be using the for-loop construct or the forEach method for iteration?

  - by Dutch

  Is one way more efficient? Are there any limitations in one method versus the other? Thanks for any input you guys can give me ;-)

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• How to create global variables in a Grails project

  - by firnnauriel

  What's the best practice of making a variable that would be accessible by almost all classes in a Grails project? Is there a config file that I can use for storage of that data (i.e. application.properties)? Thanks.

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• SQL: ... WHERE X IN (SELECT Y FROM ...) ...

  - by Craig Johnston

  Is the following the most efficient in SQL to achieve its result: SELECT * FROM Customers WHERE Customer_ID NOT IN (SELECT Cust_ID FROM SUBSCRIBERS) Could some use of joins be better and achieve the same result?

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• persistant message queues

  - by Will

  I have several services on different machines and a message-passing system suits my problem. Reliability - sent messages always delivered, even if one end goes down - is the key concern, although it should also be fast and reasonably bandwidth-efficient. So which message queue should I use?

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• Generate sample XML from composite hierarchical structure

  - by Jevgenij Nekrasov

  Let's say I have composite hierarchical structure. Each object in the structure has child collection of the same objects. Each object has XPath property, which stores the exact xpath to the element inside XML file. Right now I am trying to create an extension, which can generate XML string from that hierarchical structure, but first I want to make some sort of research what is the most efficient way to do that? ant what is the easiest way?

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• as3 air for android download folder and contents

  - by Papa De Beau

  Is it possible to download a folder and its contents using air for android? I would like to also use the same code on iPhone. I need it to be stored in the application storage so we can reference the content once downloaded. I know it's possible to download content as referenced in this question: Download Content using Air For Android but can a person download the entire folder and again store it in the application directory? Thanks @lukevain? :)

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• Serializing and deserializing data - JavaScript

  - by RadiantHex

  Hi folks, I need to perform a lot of serializing and de-serializing in an application. The data is POST parameters and Cookie headers. Does anyone have any fast libraries to suggest or efficient ways to perform these operations?

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• Enterprise Library Review?

  Hi, Is enterprise library for exception handling and logging efficient in terms of its memory usage for the functionality provided? What are the pros and cons? Thanks

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• How do you fix a MySQL "Incorrect key file" error when you can't repair the table?

  - by Wayne M

  I'm trying to run a rather large query that is supposed to run nightly to populate a table. I'm getting an error saying Incorrect key file for table '/var/tmp/#sql_201e_0.MYI'; try to repair it but the storage engine I'm using (whatever the default is, I guess?) doesn't support repairing tables. how do I fix this so I can run the query?

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• effective functonal sort

  - by sreservoir

  I'm programming a function for a ti-nspire, so I can't use the builtins from inside a function. what is the most generally efficient algorithm for sorting a list of numbers without modifying the list itself? (recursion and list-splitting are fair game, as is general use of math.)

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• Excluding a directory from SVN initial import in NetBeans

  - by xain

  Hi, I'm importing a project into a svn repository using netbeans 6.8, and there's a whole subtree I don't want to import. Is there an efficient way to exclude it or will I just have to go file by file telling it to skip them ? Thanks

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• Book recommendation for project architecture?

  - by Mark

  I already have a solid knowledge of Object-oriented PHP as well as HTML/Javascript/MySQL plus a basis in Java. Now I would like to implement my projects in an efficient way, whether it is a web project in PHP or an Android application. My problem is once my code gets bigger I start messing error handling, with form validation etc, and I guess its because of my poor basis in software architecture. Thanks.

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• What data type to use for variable length data (for performance)?

  - by jiewmeng

  What data type should I use for data that can be very short, eg. html link (think twitter), or very long eg. html blog post (think wordpress). I am thinking if I use varchar(4000), it maybe too short for a html formated blog entry? but if I use text, it will take up more space and is less efficient?

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