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  • MySQL - How To Avoid Repair With Keycache?

    - by dvancouver
    I have had some experience with optimizing the my.cnf file but my database has around 4 million records (MyISAM). I am trying to restore from a mysqldump but every time I do I eventually get the dreaded "Repair With Keycache", that may take days. Is there anyway to get past this and let it roll as "Repair By Sorting"? I have 2GB RAM, Dual Cores, lots of extra hard-drive space. Snip out of my.cnf: set-variable = max_connections=650 set-variable = key_buffer=256M set-variable = myisam_sort_buffer_size=64M set-variable = join_buffer=1M set-variable = record_buffer=1M set-variable = sort_buffer_size=2M set-variable = read_buffer_size=2M set-variable = query_cache_size=32M set-variable = table_cache=1024 set-variable = thread_cache_size=256 set-variable = wait_timeout=7200 set-variable = connect_timeout=10 set-variable = max_allowed_packet=16M set-variable = max_connect_errors=10 set-variable = thread_concurrency=8

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  • Efficiently storing a list of prime numbers

    - by eSKay
    This article says: Every prime number can be expressed as 30k±1, 30k±7, 30k±11, or 30k±13 for some k. That means we can use eight bits per thirty numbers to store all the primes; a million primes can be compressed to 33,334 bytes "That means we can use eight bits per thirty numbers to store all the primes" This "eight bits per thirty numbers" would be for k, correct? But each k value will not necessarily take-up just one bit. Shouldn't it be eight k values instead? "a million primes can be compressed to 33,334 bytes" I am not sure how this is true. We need to indicate two things: VALUE of k (can be arbitrarily large) STATE from one of the eight states (-13,-11,-7,-1,1,7,11,13) I am not following how 33,334 bytes was arrived at, but I can say one thing: as the prime numbers become larger and larger in value, we will need more space to store the value of k. How, then can we fix it at 33,334 bytes?

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  • Why does my Windows Form app timeout when repeatedly hitting IIS 7 externally?

    - by andy
    hey guys, I've got a very simple Windows Form app that hits an IIS 7 site about 2000 times in the space of a few seconds (using threads). When I run that app on the server itself, using either localhost or the ip address, everything is totally fine. However, when I run the app on my dev box, using the ip address, I get an error from the "GetResponse" method: The operation has timed out The App can definitely connect to the site, because it consistently either starts throwing the timeout error after 10 or so hits (no more than 11), or it throws the timeout error immediately. What's going on? It's hitting IIS 7 on a Windows Server 2008 VM (external box), Windows Firewall is OFF. My App is running locally on my dev box as the admin. cheers

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  • When does printf("%s", char*) stop printing?

    - by remagen
    In my class we are writing our own copy of C's malloc() function. To test my code (which can currently allocate space fine) I was using: char* ptr = my_malloc(6*sizeof(char)); memcpy(ptr, "Hello\n", 6*sizeof(char)); printf("%s", ptr); The output would typically be this: Hello Unprintable character Some debugging figured that my code wasn't causing this per say, as ptr's memory is as follows: [24 bytes of meta info][Number of requested bytes][Padding] So I figured that printf was reaching into the padding, which is just garbage. So I ran a test of: printf("%s", "test\nd"); and got: test d Which makes me wonder, when DOES printf("%s", char*) stop printing chars?

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  • Self Assesstment Tests for Programmers

    - by THX1138.6
    I want to help the Dev team identify areas of knowledge (practical and theoretical) that they can work on. Though I am big believer in focusing on people's strengths being a good programmer requires (I think) being challenged by concepts and ideas that don't always come naturally. We work largely in the web app space using PHP & MySQL but better skills in data modelling, query optimisation, use of MVC and OOP etc. would help the team and the company a lot. I want to help the Dev team manage their careers, explore and expand their skills sets. Be all they can be and better than they were previously. I know its an idealistic goal but work must be about more than simply getting the work done. There should be some time to review, to learn, to grow and get better. Any thoughts, ideas, opinions and directions to tests or similar resources would be greatly appreciated.

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  • How to customize the ColorPicker class in Adobe flex3.0?

    - by Ankur Sharma
    i have to make the colorpiker tool of flex, to be a customized one, i beleive you have seen the color picker tool of flex, when you click on the colorpicker, a swatch panel gets open, right?? now in that swatch, there are three compoenents, one is thw colorbox(on top left), beside right to this is the text field holding the hex code of the color and below these two tools, is the colors present in the small rectangles, now my need is this, i want to add three more buttons on the top empty space after textfield, so that structure of the colors pciker looks like this colorbox | textfield | button1 | button2 | button3 color rectangles, showing all default colors i beleive u understood, what i meant here, so plzz help me out in making a custom colorpciker class, thanx Namaste

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  • How to work with BufferedImage and YCbCr colorspace?

    - by Onlyx
    Hi everyone! I need to translate colors in bitmap loaded to BufferedImage from RGB to YCbCr (luminance and 2 channels chrominance) and back after process. I made it with functions used like rgb2ycbcr() in main method for each pixel, but it isn't so smart solution. I should use ColorSpace and ColorModel classes to get BufferedImage with correct color space. It would be more flexible method, but I don't know how to do that. I'm lost and I need some tips. Can somebody help me?

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  • SQL Split function.

    - by Wardy
    Hi guys, I'm looking for a way to do this ... SELECT FirstName, LastName, Split(AddressBlock, ' ', 1), Split(AddressBlock, ' ', 2), PostCode FROM Contacts The arguments I want to pass are ... The address The separator (current situation requires 2 spaces but this might be a comma or a space followed by a comma) or something else (it varies). The address part I want to return (i don't always need all parts of the split result). I seem to be able to find a few examples of splitting functions about the internet but they return a table containing the entire set of split parts. My SQL skills aren't that great so I need the answer to be ultra simple. I'm always working with nvarchar data and the function needs to be reusable.

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  • IE7 li ul bug on dropdown menu

    - by Berns
    hoping one of you guys can help me please. I have a basic list menu with two dropdowns. This all works fine on all browsers except IE6 and IE7. Please take a look at my markup. <nav> <ul id="topNav" ><li id="topNavFirst"><a href="../about/about.php" id="aboutNav">About Us</a></li ><li id="topNavSecond"><a href="../people/our-people.php" id="peopleNav">Our People</a ><ul id="subList1"><li><a href="../people/mike-hadfield.php">Mike Hadfield</a></li ><li><a href="../people/karen-sampson.php">Karen Sampson</a></li ><li><a href="../people/milhana-farook.php">Milhana Farook</a></li ><li><a href="../people/kim-crook.php">Kim Crook</a></li ><li><a href="../people/amanda-lynch.php">Amanda Lynch</a></li ><li><a href="../people/gideon-scott.php">Gideon Scott</a></li ><li><a href="../people/paul-fuller.php">Paul Fuller</a></li ><li><a href="../people/peter-chaplain.php">Peter Chaplain</a></li ><li><a href="../people/laura-hutley.php">Laura Hutley</a></li ></ul ></li ><li id="topNavThird"><a href="../services/our-services.php" id="servicesNav">Our Services</a ><ul id="subList2"><li><a href="../services/company-and-commercial.php">Company &amp; Commercial</a></li ><li><a href="../services/employment.php">Employment</a></li ><li><a href="../services/civil-litigation.php">Civil Litigation</a></li ><li><a href="../services/debt-recovery.php">Debt Recovery</a></li ><li><a href="../services/conveyancing.php">Conveyancing</a></li ><li><a href="../services/commercial-property.php">Commerical Property</a></li ><li><a href="../services/wills-and-probate.php">Wills &amp; Probate</a></li ><li><a href="../services/family.php">Matrimonial &amp; Family</a></li ></ul ></li ><li><a href="../news/news.php" id="newsNav">News</a></li ><li><a href="../careers/careers.php" id="careersNav">Careers</a></li ><li><a href="../contact/contact.php" id="contactNav">Contact</a></li ></ul><!-- /topNav --> </nav>? and the css a {text-decoration:none;} #topNav { float:right; height:30px; margin:0; font-size:12px; } #topNav li { display:inline; float:left; list-style:none; color:#666; border-left: 1px solid #666; padding: 0 3px 0 3px; position:relative; } #topNav ul a { white-space:nowrap; } #topNav li a:hover { border-bottom:2px solid #369; } #topNavSecond a:hover { border-bottom:2px solid transparent !important; } #topNavFirst { border-left: 1px solid transparent !important; } /*****OUR-PEOPLE DROPDOWN*****/ #topNav ul{ background:#fff; border:1px solid #666; border-top:0px solid transparent; border-bottom:2px solid #666; list-style:none; position:absolute; left:-9999px; width:100px; text-align:left; padding:5px 0 5px 0px; margin:0 0 0 -4px; z-index:10; -webkit-box-shadow: 1px 1px 1px #666; -moz-box-shadow: 1px 1px 1px #666; box-shadow: 1px 1px 1px #666; vertical-align: bottom; } #topNav ul li{ display:block; border-left:0px; margin-bottom: 0px; padding:0; vertical-align: bottom; } #topNav ul a{ padding:0 0 0 5px; } #topNav li:hover ul{ left:auto; } #topNav li:hover a { color:#369; } #topNav li:hover ul a{ text-decoration:none; color:#666; } #topNav li:hover ul li a:hover{ color:#fff;; width:100%; border-bottom:0px solid transparent !important; } #topNav ul li:hover { background:#369; display: block; } #topNav ul li a { display: block; padding:0 0 0 4px; } /************/ /*****OUR-SERVICES DROPDOWN*****/ #topNavThird a:hover { border-bottom:2px solid transparent !important; } #topNavThird ul{ /*background:#fff url(images/service-ul-bg.png) no-repeat;*/ width:135px !important; /*margin-left:120px !important;*/ }? here it is working perfectly http://jsfiddle.net/BcWd9/ here is a screen shot of how it looks in IE7. hadfield.andymcnallydesign.co.uk/images/ie7-error.jpg as you can see the ul is appearing to the right of the li and not the left and it is overlaying the top list. I've tried removing white space, but no luck. Any ideas? If one of you can help it would be much appreciated.

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  • Connecting to multiple firebird Databases via Delphi

    - by Branden
    I am integrating a system with 2 other applications, 1 using a Firebird database whilst the other BIS (using ADO). My delphi application uses Firebird. I need to read data from my database, insert it into both the BIS database and the other application firebird database. I have created seperate data modules for each. Sending data to the ADO works fine, but when writing to the other Firebird DB (my db still open) I get strange errors. I have managed to isolate the problem to the second firebird DB. Small data writes seems fine. The data structures are completly different, so un able to use a synch tool. is there a way to overcome this by using multi threading or seperate memory space each Firebird instance uses?

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  • How do I tell eclipse to auto-generate or retain stubs when it starts and does a clean build?

    - by Erick Robertson
    I'm working on a Java application that uses JavaSpace. We're developing this in Eclipse. There are a couple instances where we are inserting code into the JavaSpace to do some more advanced space notification logic. Doing this requires that we generate stubs for the classes used within the JavaSpace. We use an external script to generate these stubs. The problem is that whenever Eclipse restarts, it does a clean build of the whole application. When it does this, it deletes all the stubs and we have to regenerate them. I would like to find a way to either tell Eclipse not to remove the _stub.class and _skel.class files within the bin folder where the .class files are placed. Either that, or somehow teach Eclipse to generate the stub files whenever it does a rebuild (and I suppose whenever the source files from which the stubs are generated changes). How can I do one of these, so that we don't have to manually build the stubs every time we start up Eclipse?

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  • Do not show partial items in a WPF listbox

    - by David Martin
    I've tried Google and I've tried Bing to no avail. Does anyone here have an idea on how to prevent partial items from appearing in a listbox in WPF? In case that does not make sense here is an example: Listbox is 200 pixels tall - each item is 35 pixels tall. That means I can show 5.7 items. 7/10 of an item is undesirable. I'd like to limit it to showing only 5 items. The user could then scroll to see the additional items. Should I A) try to dynamically size the listbox or ScrollViewer ViewPort so that it fits perfectly? Or B) implement a custom panel that would not arrange a child whose desired height is more than the remaining vertical space? Any thoughts would be greatly appreciated. Last note: If anyone knows of a 3rd party control (listbox or grid) that does this I would be interested in that as well.

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  • operating systems - TLBs

    - by stabGreeol
    I'm trying to get my head round this (okay, tbh cramming a night before the exams :) but i can't figure out (nor find a good high level overview on the net) of this: 'page table entries can be mapped to more than one TLB entry.. if for example every page table entry is mappped to two TLB entries, this is know as 2-way set associative TLB' My question is, why would we want to map this more than once? surely we want to have the maximum number of possible entries represented in the TLB, and duplication would waste space right ? What am i missing? Many thanks

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  • Thread Local Storage and local method variables

    - by miguel
    In c#, each thread has its own stack space. If this is the case, why is the following code not thread-safe? (It is stated that this code is thread-safe on this post: Locking in C# class Foo { private int count = 0; public void TrySomething() { count++; } } As count is an int (stack variable), surely this value would be isolated to an individual thread, on its own stack, and therefore thread-safe? I am probably missing something here, but I dont understand what is actually in Thread Local Storage if not stack-based variables for the thread?

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  • Using xsl:key to store result of boolean expression

    - by hielsnoppe
    In my transformation there is an expression some elements are repeatedly tested against. To reduce redundancy I'd like to encapsulate this in an xsl:key like this (not working): <xsl:key name="td-is-empty" match="td" use="not(./node()[normalize-space(.) or ./node()])" /> The expected behaviour is the key to yield a boolean value of true in case the expression is evaluated successfully and otherwise false. Then I'd like to use it as follows: <xsl:template match="td[not(key('td-is-empty', .))]" /> Is this possible and in case yes, how?

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  • Virtual Memory and Paging

    - by Kenshin
    Hello, I am doing some exercices to understand how the virtual memory and paging works, my question is as follows : Suppose we use a paged memory with pages of 1024 bytes, the virtual address space is of 8 pages but the physical memory can only contain 4 frames of pages. Replacement policy is LRU. What is the physical address in main memory that corresponds to virtual address 4096? and how do you get to that result? Same thing as question 1 but with virtual address 1024 A page fault occurs when accessing a word in page 0, which page frame will be used to receive the virtual page 0? Page Image

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  • Variable height header with scrollable content area filling remaining viewport area

    - by Neutrino
    I've seen versions of this simple problem raised a dozen times here and elsewhere on the web, but I haven't seen a solution that works for me yet so I'm asking it again. I want a webpage with a variable height full width header (height based on contents). Below that I want a content area that fills the rest of the browser viewport. If the content is larger than the remaining space in the viewport then I want the content area to scroll. I don't need this to work on IE6. I don't care whether the solution uses CSS, tables or a mixture of the two, just no frames and no Javascript. For a bonus point fix a variable height footer to the bottom of the page.

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  • How to center an R plot

    - by ConnorG
    I'm working on visualizing a matrix in R (almost exactly like http://reference.wolfram.com/mathematica/ref/MatrixPlot.html), and I've been using image(<matrix>,axes=FALSE) to draw the picture. However, I noticed that with the y-axis turned off, the plot isn't centered--the space is still there for the axis ticks + label. I can finagle some centering with par(oma=c(0,0,0,2.5)) but this seems inefficient and error-prone (if my matrix were to change dimensions/become non-square). Is there a better way to force the graphic to center? The right hand margin is significantly smaller than the left.

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  • Simple but efficient way to store a series of small changes to an image?

    - by finnw
    I have a series of images. Each one is typically (but not always) similar to the previous one, with 3 or 4 small rectangular regions updated. I need to record these changes using a minimum of disk space. The source images are not compressed, but I would like the deltas to be compressed. I need to be able to recreate the images exactly as input (so a lossy video codec is not appropriate.) I am thinking of something along the lines of: Composite the new image with a negative of the old image Save the composited image in any common format that can compress using RLE (probably PNG.) Recreate the second image by compositing the previous image with the delta. Although the images have an alpha channel, I can ignore it for the purposes of this function. Is there an easy-to-implement algorithm or free Java library with this capability?

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  • Special Character Meanings Defined

    - by Noctis Skytower
    In Python's module named string, there is a line that says whitespace = ' \t\n\r\v\f'. ' ' is a space character. '\t' is a tab character. '\n' is a newline character. '\r' is a carriage-return character. '\v' maps to '\x0b' (11). What does it mean and how might it be typed on a keyboard (any OS)? '\f' maps to '\x0c' (12). What does it mean and how might it be typed on a keyboard (any OS)?

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  • Garbage collecting at ColdFusion CFC

    - by Sergii
    Hello. I have a CFC as singletone object in Application scope. One of the methods is used for massive data processing and periodically causes the "Java heap space" errors. EDIT All variables inside the method are VAR-scoped, so they should not be kept in the object scope when invokation ended. It can be a bit dumb question for Java people, but I'd like to know how Java garbage collector cleans up the CFC methods memory: only when whole request ends, or maybe right after each method/function invokation? Second option is interesting because it can allow me to split my large method into the few, as one of the possible optimizations.

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  • Create an autocompleter like the Facebook status update

    - by Terw
    Hello I'm trying to create a div with contenteditable like the Facebook status update. Then I mean I want to show an autocomplete box when the user have written @. How would you do that. Currently I'm just playing with keypress and check if the keycode = 64. Somehow that works, but it doesn't validate if there's a space before the alfa, or if the user has unfocused the box, then focused it again. Any ideas? Or do you know about any plugin that works something like that? Tnx

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  • Memory-Mapped Files & Transparent Persistence of Java Objects

    - by geeko
    Greeting All, I want to achieve transparent persistence of Java objects through memory-mapped files (utilize the OS paging/swapping mechanism). My problem is: how can I move a Java object to my memory-mapped block ? Plus, how can I force a new object instance to reside in such blocks ? As you all know, a memory-mapped block can be seen as a byte array, and what I am really asking here is how to overlap the address space of Java objects with the one of such arrays ? If Java does not allow me for this, what cross-platform & garbage-collecting OO language would you advise me to use ? Thank you all in advance.

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  • How to format output using MATLAB's num2str

    - by Doresoom
    I'm trying to ouput an array of numbers as a string in MATLAB. I know this is easily done using num2str, but I wanted commas followed by a space to separate the numbers, not tabs. The array elements will at most have resolution to the tenths place, but most of them will be integers. Is there a way to format output so that unnecessary trailing zeros are left off? Here's what I've managed to put together: data=[2,3,5.5,4]; datastring=num2str(data,'%.1f, '); datastring=['[',datastring(1:end-1),']'] which gives the output: [2.0, 3.0, 5.5, 4.0] rather than: [2, 3, 5.5, 4] Any suggestions? EDIT: I just realized that I can use strrep to fix this by calling datastring=strrep(datastring,'.0','') but that seems even more kludgey than what I've been doing.

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  • XSLT Sort Alphabetically & Numerically Problem

    - by Bryan
    I have a group of strings ie g:lines = '9,1,306,LUCY,G,89' I need the output to be: 1,9,89,306,G,LUCY This is my current code: <xsl:for-each select="$all_alerts[g:problem!='normal_service'][g:service='bus']"> <xsl:sort select="g:line"/> <xsl:sort select="number(g:line)" data-type="number"/> <xsl:value-of select="normalize-space(g:line)" /><xsl:text/> <xsl:if test="position()!=last()"><xsl:text>,&#160;</xsl:text></xsl:if> </xsl:for-each> I can get it to only display '1, 12, 306, 38, 9, G, LUCY' because the 2nd sort isn't being picked up. Anyone able help me out?

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