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  • Should I use multiple column primary keys or add a new column?

    - by Covar
    My current database design makes use of a multiple column primary key to use existing data (that would be unique anyway) instead of creating an additional column assigning each entry an arbitrary key. I know that this is allowed, but was wondering if this is a practice that I might want to use cautiously and possibly avoid (much like goto in C). So what are some of the disadvantages I might see in this approach or reasons I might want a single column key?

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  • How can I sync between multiple threads so that their transaction ID be unique without using mutex?

    - by poly
    I'm writing an application in C that requires multiple threads to request a unique transaction ID from a function as shown below; struct list{ int id; struct list *next }; function generate_id() { linked-list is built here to hold 10 millions } How can I sync between two or more threads so that their transaction ID be unique among them without using mutex, is it possible? Please share anything even if I need to change linked list to something else.

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  • How to type multiple characters on a mac with a single click?

    - by Yuval
    On a Windows machine, clicking and holding a keyboard key results in the key being types multiple times. For example, if I click and hold 'q' for a few seconds, I end up with the following: qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq Similarly, I can click and hold the Backspace key to delete multiple characters. On a Mac, it seems, clicking and holding a key for several seconds results in the key being types only once. To type it repeatedly, it is necessary to psychically click it multiple times. I'm unclear about whether that is a bug or a supposed-feature, but I am interested in replicating this functionality on a Mac. Any ideas? Thanks!

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  • Does multiple files in SQL Server when using RAID help reduce conflicts in growth and file-locking?

    - by Dr Giles M
    I've been reading around and get the impression that if you are using RAID then using multiple SQL Server files within a filegroup won't yeild any more improvements, and the benefits are purely administrative (if you started to run out of space or wanted to partition off data into managable chunks for backups/balancing the data around your big server room). However, being a reasonably savvy software person, it's not unthinkable to hypothesise that, even for smaller databases that SQL Server will perform growth and locking operations (for writes) on a LOGICAL file basis, so even if you are using RAID, it seems to make sense to have multiple files in a file group to balance I/O, or does the time taken to reconstruct the data from distributed filegroups outweigh the benefits of reduced locking? I'm also aware that the behaviour and benefits may be different for tables/indeces/log. Is there a good site that distinguishes the benefits of multiple files when RAID is already in place?

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  • Multiple Memcached server /etc/init.d startup script that works ?

    - by p4guru
    I install memcached server via source and can get standard start up script installed for 1 memcached server instance, but trying several scripts via google, can't find one that works to manager auto start up on boot for multiple memcached server instances. I've tried both these scripts and both don't work, service memcached start just returns to command prompt with no memcached server instances started lullabot.com/articles/installing-memcached-redhat-or-centos addmoremem.blogspot.com/2010/09/running-multiple-instances-of-memcached.html However this bash script works but doesn't start up memcached instances at start up though ? #!/bin/sh case "$1" in start) /usr/local/bin/memcached -d -m 16 -p 11211 -u nobody /usr/local/bin/memcached -d -m 16 -p 11212 -u nobody ;; stop) killall memcached ;; esac OS: Centos 5.5 64bit Memcached = v1.4.5 Memcache = v2.2.5 Anyone can point me to a working /etc/init.d/ startup script to manage multiple memcached servers ? Thanks

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  • How do I host multiple SSL websites on a single EC2 instance using Amazon Elastic Load Balancers?

    - by Developr
    If I have 3 separate websites which all require SSL (separate certificates) that I want to host on the same EC2 instance(s) across multiple availability zones so that we have the ability to scale and be highly available, how do I achieve this using ELBs in my Amazon VPC? Each site requires a separate IP address, so I have added multiple private IPs to the EC2 instance, but I am unsure how to bind the ELB to a certain IP on the instance. I was also able to setup multiple ELB pointing to the same instance, but again, I am not seeing any way to bind each ELB to a separate IP on the instance. If this is not possible, what is the best option? Run each site on a separate EC2 instance / ELB combo (expensive and harder to maintain) Give each site a separate public IP and use Route 53 to do the load balancing (seems like a hack) Use a different load balancer option such as HAProxy that should be able to work like a normal load balancer appliance. Please help!

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  • How to configure Nginx to serve a variety of back-ends via multiple FCGI processes?

    - by Ben Horton
    I've seen a lot of tutorials showing one how to set up PHP/Python/Perl/RoR on nginx via various FCGI processes. None of the tutorials that I found show one how to serve multiple FCGI services off one server. How would one configure the stable nginx (nginx-0.7.64) to serve multiple FCGI processes (one for each of the above languages)? Example addresses for each FCGI process are as follows: 127.0.0.1:8080 - PHP 127.0.0.1:8081 - Python 127.0.0.1:8082 - Perl 127.0.0.1:8083 - Ruby on Rails An example configuration file that shows one how to implement multiple FCGI's off one server is really what I need. Perhaps others will benefit as well.

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  • Does a single LACP channel over multiple switches increase redundancy?

    - by Sirch
    I am curious for opinions, findings, or evidence that having multiple interfaces bonded using LACP to ports in multiple switches can increase redundancy. Previously bonded interfaces have always been to a single switch, with a redundant channel to another port. Without getting into vendor specifics, my thought is that as this is a single LACP, the likelihood that an event or change could lead to a wide service outage. Without having the spare equipment or time to test this single channel over diverse switches, could anyone with a greater networking knowledge than myself, tell me if there a network side event that would bring down the network connectivity to a server that had created a bonded interface to two ports on separate switches? Does the use of bonded ethernet channels across multiple switches (that we are advised that we can use) from the server, provide both improved throughput (unquestionably), and improved redundancy (uncertain). Could/would network events such as switch failure, port migration, patching, recovery, etc, cause the channel for both server network interfaces to be unavailable? Thanks in advance.

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  • Multiple SSL domains on the same IP address and same port?

    - by John
    This is a Canonical Question about Hosting multiple SSL websites on the same IP. I was under the impression that each SSL Certificate required it's own unique IP Address/Port combination. But the answer to a previous question I posted is at odds with this claim. Using information from that Question, I was able to get multiple SSL certificates to work on the same IP address and on port 443. I am very confused as to why this works given the assumption above and reinforced by others that each SSL domain website on the same server requires its own IP/Port. I am suspicious that I did something wrong. Can multiple SSL Certificates be used this way?

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  • Is it Possible to Query Multiple Databases with WCF Data Services?

    - by Mas
    I have data being inserted into multiple databases with the same schema. The multiple databases exist for performance reasons. I need to create a WCF service that a client can use to query the databases. However from the client's point of view, there is only 1 database. By this I mean when a client performs a query, it should query all databases and return the combined results. I also need to provide the flexibility for the client to define its own queries. Therefore I am looking into WCF Data Services, which provides the very nice functionality for client specified queries. So far, it seems that a DataService can only make a query to a single database. I found no override that would allow me to dispatch queries to multiple databases. Does anyone know if it is possible for a WCF Data Service to query against multiple databases with the same schema?

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  • Selenium/NUnit run one test on multiple IP addresses.

    - by Matt Clarkson
    I have a test suite DLL written in C# that uses Selenium.This is then loaded into NUnit and tests can be performed on our embedded web server boards. Does anyone know how to run a NUnit Selenium test on multiple IPs in multiple browsers? I have tried creating multiple DefaultSelenium classes but they point to the same Internet Explorer window. I need multiple instances of the Selenium RC controlling individual Internet Explorer windows. Have been looking a lot on the Selenium User Group and in various documentation but can find a definitive answer. Cheers, Matt

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  • How to play the same Sound multiple times with overlap, using OpenAL or Finch?

    - by mystify
    Finch uses OpenAL. However, when I have an instance of Sound, and say -play, the sound plays. When I call -play multiple times one after another in a fast paced way, every -play makes the current sound playback of that sound stop and restart it. That's not what I want. Would I have to create multiple sources or buffers to get that working? Or would I just instantiate multiple Sounds with the same file?

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  • To Create a Search, with values from multiple selection element?

    - by Harish
    I am working in PHP(with Symfony Framework) and i want to create a search based on multiple values selected from multiple selection element, i.e there will be multiple selection dropdown elements for like countries, cities, age etc.. and the values from them will query a data table and give the desired search output. (all values are not mandatory, will work with atleast one value). the idea will also do..

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  • I need to implement C# deep copy constructors with inheritance. What patterns are there to choose fr

    - by Tony Lambert
    I wish to implement a deepcopy of my classes hierarchy in C# public Class ParentObj : ICloneable { protected int myA; public virtual Object Clone () { ParentObj newObj = new ParentObj(); newObj.myA = theObj.MyA; return newObj; } } public Class ChildObj : ParentObj { protected int myB; public override Object Clone ( ) { Parent newObj = this.base.Clone(); newObj.myB = theObj.MyB; return newObj; } } This will not work as when Cloning the Child only a parent is new-ed. In my code some classes have large hierarchies. What is the recommended way of doing this? Cloning everything at each level without calling the base class seems wrong? There must be some neat solutions to this problem, what are they? Can I thank everyone for their answers. It was really interesting to see some of the approaches. I think it would be good if someone gave an example of a reflection answer for completeness. +1 awaiting!

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  • How to get multiple selected values of select box in php?

    - by Param-Ganak
    Hi Friends! I have a html form which have a select list box from which you can select multiple values because its multiple property is set to multiple. Consider form method is get method. The html code for form is as follows. <html> <head> <title>Untitled Document</title> </head> <body> <form id="form1" name="form1" method="get" action="display.php"> <table width="300" border="1"> <tr> <td><label>Multiple Selection </label>&nbsp;</td> <td><select name="select2" size="3" multiple="multiple" tabindex="1"> <option value="11">eleven</option> <option value="12">twelve</option> <option value="13">thirette</option> <option value="14">fourteen</option> <option value="15">fifteen</option> <option value="16">sixteen</option> <option value="17">seventeen</option> <option value="18">eighteen</option> <option value="19">nineteen</option> <option value="20">twenty</option> </select> </td> </tr> <tr> <td>&nbsp;</td> <td><input type="submit" name="Submit" value="Submit" tabindex="2" /></td> </tr> </table> </form> </body> </html> I want to display the selected values in select list box on display.php page. So how the selected values are accessed on display.php page using $_GET[] array. Please reply Friends. Bye. Thank You.

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  • Can I create an ASP.NET MVC 2 project with multiple areas without referencing each Child in the pare

    - by No Refunds No Returns
    This is a follow-up question to my original query: http://stackoverflow.com/questions/1791605/how-can-i-use-multiple-projects-to-separate-a-large-asp-net-mvc-site-into-departm Now that I have this working, is there a way to still have multiple project but not have to reference each child area from the parent project? Ideally I'd like to be able to have multiple, separate and distinct projects that only come together on the production/test machines. I should be able to build and test each "area" separately.

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  • Pass Session data to a Class Library without using a bunch of constructors?

    - by sah302
    Hi all, I've got my application here where literally every object has a lastUpdatedBy property. The information I put into here is the person's username, which is retrieved from the session("username") variable. How can I pass this data to my DAL in the class library? At first I was just passing in the value into each method, but this is ridiculous I thought, there should be no reason to do that every time a method is called. Then I thought well if I just put it in a constructor for each of the DAL related classes, that will make it even easier. However, even still on any given page, I've got a plethora of New() declarations, for which every single line I need to pass in the session username casted as a string. Is there an even still more efficient way of doing this so that I could only declare this in one place, and everything will know what it is and I can pass it to classes in a class library?

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  • How do I create a multiple-table check constraint?

    - by Zack Peterson
    Please imagine this small database... Diagram Tables Volunteer Event Shift EventVolunteer ========= ===== ===== ============== Id Id Id EventId Name Name EventId VolunteerId Email Location VolunteerId Phone Day Description Comment Description Start End Associations Volunteers may sign up for multiple events. Events may be staffed by multiple volunteers. An event may have multiple shifts. A shift belongs to only a single event. A shift may be staffed by only a single volunteer. A volunteer may staff multiple shifts. Check Constraints Can I create a check constraint to enforce that no shift is staffed by a volunteer that's not signed up for that shift's event? Can I create a check constraint to enforce that two overlapping shifts are never staffed by the same volunteer?

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  • Is there anything wrong with taking immediate actions in constructors?

    - by pestaa
    I have classes like this one: class SomeObject { public function __construct($param1, $param2) { $this->process($param1, $param2); } ... } So I can instantly "call" it as some sort of global function just like new SomeObject($arg1, $arg2); which has the benefits of staying concise, being easy to understand, but might break unwritten rules of semantics by not waiting till a method is called. Should I continue to feel bad because of a bad practice, or there's really nothing to worry about? Clarification: I do want an instance of the class. I do use internal methods of the class only. I initialize the object in the constructor, but call the "important" action-taker methods too. I am selfish in the light of these sentences.

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  • [asp.net-mvc]Handling Multiple Form Actions on One View?

    - by Pandiya Chendur
    I have multiple master pages in my asp.net mvc web application... Each of the pages add,edit,view and delete functionalities.... What it does is i have to create multiple views for handling add,edit,view and delete functionalities (ie) the user has to navigate to another view to edit/view the details of a record... How to Handle Multiple Form Actions (ie) add,edit,view and delete functionalities on One View?

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