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• Should I be worrying about limiting the number of textures in my game?

  - by Donutz

  I am working on a GUI in XNA 4.0 at the moment. (Before you point out that there are many GUIs already in existance, this is as much a learning exercise as a practical project). As you may know, controls and dialogs in Windows actually consist of a number of system-level windows. For instance, a dialog box may consist of a window for the whole dialog, a child window for the client area, another window (barely showing) for the frame, and so on. This makes detecting mouse hits and doing clipping relatively easy. I'd like to design my XNA GUI along the same lines, but using overlapping Textures instead of windows obviously. My question (yes, there's actually a question in this drivel) is: am I at risk of adversely affecting game performance and/or running low in resources if I get too nuts with the creating of many small textures? I haven't been able to find much information on how resource-tight the XNA environment actually is. I grew up in the days of 64K ram so I'm used to obsessing about resources and optimization. Anyway, any feedback appreciated.

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• How do I get any number of links to space evenly? [migrated]

  - by Aerodynamo

  Alright, so here is the situation... Say I have a navbar for a site, and I allow users to change the number of links they want on this navbar. This means they could have 3, 5, 10, etc. What I want to do is make it so that if one link is up, it only takes up, say, 1/5th of the space on the navbar. If I weren't using borders, I might do something like: width: 18%; padding: 0 1%; However, I have two problems with this: 1) For 4 buttons, that's fine that it doesn't fill up the whole row. It would look ugly if the links were too wide... but when I have 6 or 7 buttons, it's got huge overflow! 2) Since I have borders, I can't use a percentage value for the borders or the widths, because I can't properly estimate how much of the percentage it will be. Now, I know I don't have to use percentage values, but what I would ideally prefer is that the first button is the smallest possible size necessary for all the other buttons to fit properly, meaning that if I have 950px and 6 links, the first link can be about 150px while the others are 160px... that's fine. I want all the other buttons on the navbar to be equally sized, regardless of how many links there are. I also need for it to accept a border... I figure the way to do this is to put a border in the nested div, so that way it doesn't effect the overall width of the button? This is all well and good, but I'm still plagued by the issue of not being able to design a dynamic site using the style I want if I can't get all the nav buttons to fit the width properly. Are there some js tricks I could use? I don't even know... Thanks

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• Are there any working implementations of the rolling hash function used in the Rabin-Karp string sea

  - by c14ppy

  I'm looking to use a rolling hash function so I can take hashes of n-grams of a very large string. For example: "stackoverflow", broken up into 5 grams would be: "stack", "tacko", "ackov", "ckove", "kover", "overf", "verfl", "erflo", "rflow" This is ideal for a rolling hash function because after I calculate the first n-gram hash, the following ones are relatively cheap to calculate because I simply have to drop the first letter of the first hash and add the new last letter of the second hash. I know that in general this hash function is generated as: H = c1ak - 1 + c2ak - 2 + c3ak - 3 + ... + cka0 where a is a constant and c1,...,ck are the input characters. If you follow this link on the Rabin-Karp string search algorithm , it states that "a" is usually some large prime. I want my hashes to be stored in 32 bit integers, so how large of a prime should "a" be, such that I don't overflow my integer? Does there exist an existing implementation of this hash function somewhere that I could already use? Here is an implementation I created: public class hash2 { public int prime = 101; public int hash(String text) { int hash = 0; for(int i = 0; i < text.length(); i++) { char c = text.charAt(i); hash += c * (int) (Math.pow(prime, text.length() - 1 - i)); } return hash; } public int rollHash(int previousHash, String previousText, String currentText) { char firstChar = previousText.charAt(0); char lastChar = currentText.charAt(currentText.length() - 1); int firstCharHash = firstChar * (int) (Math.pow(prime, previousText.length() - 1)); int hash = (previousHash - firstCharHash) * prime + lastChar; return hash; } public static void main(String[] args) { hash2 hashify = new hash2(); int firstHash = hashify.hash("mydog"); System.out.println(firstHash); System.out.println(hashify.hash("ydogr")); System.out.println(hashify.rollHash(firstHash, "mydog", "ydogr")); } } I'm using 101 as my prime. Does it matter if my hashes will overflow? I think this is desirable but I'm not sure. Does this seem like the right way to go about this?

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• Why does "return ERROR" only work with exceptions?

  - by ThreaT

  In the struts.xml I use: <result name="error">error</result> Then in my action I use: addActionError("ERROR RETURNED"); return ERROR; When I submit the form then it just goes to a blank page and does nothing. However, if I FORCE an exception to be thrown in the action then it goes to the error page and shows the ActionError message. So am I doing this wrong? If so, how should I tell struts to show an error page using "if statements" instead of relying solely on expensive try catches? EDIT 1: I'm using struts 2 version: 2.1.8.1 EDIT 2: For example, here is my action code that I'm using to test: String test = ""; int number = 0; try { if (number == 1) { System.out.println("number 1: " + number); test = SUCCESS; } else if (number == 2) { System.out.println("number 2: " + number); addActionError("ERROR RETURNED?"); addActionMessage("TESTTEST"); test = ERROR; } else if (number == 3) { System.out.println("number 3: " + number); addActionError("ERROR RETURNED?"); addActionMessage("TESTTEST"); test = INPUT; } else { System.out.println("number 4: " + number); test = LOGIN; } } catch (Exception e) { addActionError("ERROR RETURNED? " + e); } return test; And here is my JSP code: <s:form action="number_save" method="post"> <s:textfield name="number" label="Enter number" /> </s:form> <s:actionerror /> <s:fielderror /> <s:actionmessage /> EDIT 3: Here is a longer version of my struts.xml: <action name="number" method="numberCreate" class="NumberActionBean"> <result>number.jsp</result> </action> <action name="error"> <result>error.jsp</result> </action> <action name="number_save" method="numberSave" class="NumberActionBean"> <interceptor-ref name="defaultStack"></interceptor-ref> <result name="success" type="redirect">index</result> <result name="input" type="redirect">number</result> <result name="error">error</result> <result name="login" type="redirect">login</result> <result name="none">number</result> </action> EDIT 4: My error.jsp is simply a <s:actionerror /> tag with the general taglibs and html tags...

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• Array from HTML forms - Internal Server Error

  - by user1392411

  I try to make a requestform for our school. But if I transmit this form I get a "Internal Server Error". I searched but I found nothing like that. Also I don't get a only this error message "Internal Server Error", nothing more. Any ideas why? <!DOCTYPE html> <html> <head> <title></title> <meta charset="utf-8"> <meta name="description" content=""> <link rel="stylesheet" href="../css/normalize.css" /> <link rel="stylesheet" href="../css/bestellformular.css" /> <!-- HTML 5 in Internet Explorer 9 und kleiner aktivieren --> <!--[if lt IE 9]> <script type="textt/javascript" src="js/html5shiv.js"></script> <![endif]--> </head> <body> <section id="head"> </section> <form action="../php/einlesen.php" method="post"> <section id="body"> <h1>Bestellung</h1> <table> <colgroup> <col width="10%"> <col width="80%"> <col width="10%"> </colgroup> <tr> <th> Artikel-Nr. </th> <th> Artikel </th> <th> Menge </th> </tr> <tr> <td> <input type="number" placeholder="Artikel-Nr." name="articelnr[]" required /> </td> <td> <input type="text" placeholder="Name des Artikels" name="articelname[]" required /> </td> <td> <input type="number" placeholder="Menge" name="quantity[]" required /> </td> </tr> <tr> <td> <input type="number" name="articelnr[]" /> </td> <td> <input type="text" name="articelname[]" /> </td> <td> <input type="number" name="quantity[]"/> </td> </tr> <tr> <td> <input type="number" name="articelnr[]" /> </td> <td> <input type="text" name="articelname[]" /> </td> <td> <input type="number" name="quantity[]"/> </td> </tr> <tr> <td> <input type="number" name="articelnr[]" /> </td> <td> <input type="text" name="articelname[]" /> </td> <td> <input type="number" name="quantity[]"/> </td> </tr> <tr> <td> <input type="number" name="articelnr[]" /> </td> <td> <input type="text" name="articelname[]" /> </td> <td> <input type="number" name="quantity[]"/> </td> </tr> <tr> <td> <input type="number" name="articelnr[]" /> </td> <td> <input type="text" name="articelname[]" /> </td> <td> <input type="number" name="quantity[]"/> </td> </tr> <tr> <td> <input type="number" name="articelnr[]" /> </td> <td> <input type="text" name="articelname[]" /> </td> <td> <input type="number" name="quantity[]"/> </td> </tr> <tr> <td> <input type="number" name="articelnr[]" /> </td> <td> <input type="text" name="articelname[]" /> </td> <td> <input type="number" name="quantity[]"/> </td> </tr> <tr> <td> <input type="number" name="articelnr[]" /> </td> <td> <input type="text" name="articelname[]" /> </td> <td> <input type="number" name="quantity[]"/> </td> </tr> <tr> <td> <input type="number" name="articelnr[]" /> </td> <td> <input type="text" name="articelname[]" /> </td> <td> <input type="number" name="quantity[]"/> </td> </tr> <tr> <td> <input type="number" name="articelnr[]" /> </td> <td> <input type="text" name="articelname[]" /> </td> <td> <input type="number" name="quantity[]"/> </td> </tr> <tr> <td> <input type="number" name="articelnr[]" /> </td> <td> <input type="text" name="articelname[]" /> </td> <td> <input type="number" name="quantity[]"/> </td> </tr> </table> </section> <section id="info"> <div class="left"> <hr /> <p> Kundennummer <input type="text" /> </p> </div> <div class="right"> <table> <tr> <td>Firma</td> <td><input type="text" name="company"required /></td> </tr> <tr> <td>Ort, PLZ</td> <td><input type="text" name="place" required /></td> <td><input type="number" name="plz" class="number" required /></td> </tr> <tr> <td>Straße, Nr.</td> <td><input type="text" name="street"required /></td> <td><input type="number" name="streetnr" class="number" required /></td> </tr> <tr> <td>Telefon</td> <td><input type="tel" name="tel" required /></td> </tr> <tr> <td>Fax</td> <td><input type="text" name="fax" required /></td> </tr> <tr> <td>E-Mail</td> <td><input type="email" name="email" required /></td> </tr> <tr> <td>Datum</td> <td><input type="date" name="date" required placeholder="tt.mm.jj"/></td> </tr> </table> </div> </section> <section id="submit"> <input type="checkbox" name="agb" required /> Ich habe die <a href="../docs/agb.pdf">AGB</a> gelesen und akzeptiere diese. <input type="submit" value="Bestellung Abschicken"/> </section> </form> <section id="footer"> <hr /> </section> </body> </html> Any Ideas why? The data is sent to a yet empty PHP document. The bracelets in the name tag are used to get an array. My PHP version is 5.3.8

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• Excel: Conditional Formatting (Highlighting) Values Based on Another Worksheet

  - by ScottSEA

  I have a workbook that has two worksheets. The first worksheet is simply a list of the first 78,498 prime numbers in a single column, A1-A78498. The second worksheet has a grid of numbers from 1 to n. The goal is to highlight the cells with prime numbers in the grid by referencing the prime number values in the other worksheet. Is this possible, and if so, how? edit I have named the column with my prime numbers "PRIMES1T". I would like the formula to work for the entire worksheet, regardless of size, but my excel-fu is extremely weak. If at all possible, I would like to be able to enter the formula in the dialog box for conditional formatting (as below): I have tried =NOT(ISNA(MATCH(A:Z,PRIMES1T,0) (only A-Z, but have to start somewhere) with no luck.

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• I want to replace a number with successive numbers, starting at 1 and going up.

  - by Pär-Magnus Green

  I'm aware that this is something people can easily program, but I'm not familiar with those things, so I was hoping there was an easier solution. I've edited a large database of questions, including sorting, and ended up getting all the question ID's mixed up. I'm trying to do this in Notepad++, but any other suggestions are welcome. I'm wondering if there's a way to search for a string (ex. "Question[any number]") and replace the numbers with first 1, then 2, et.c. For clarification, this is how one question looks like: TriviaBot_Questions[3]['Question'][63] = "Acronyms: What does WTT stand for?"; TriviaBot_Questions[3]['Answers'][63] = {"Want To Trade"}; TriviaBot_Questions[3]['Category'][63] = 7; TriviaBot_Questions[3]['Points'][63] = 1; TriviaBot_Questions[3]['Hints'][63] = {}; and the next question, as is now, is not followed by 64. It might be 245 or 1029, and regardless of which number it is, I want it replaced with "previous number + 1", basically.

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• Creating a separate excel using Macro

  - by shayam

  Hi, I am having a excel with one column that has got information regarding tender. Each cell will have a value like Column: Nokia([Mode1.Number],OLD) Column: Motorola([Mode1.Number],OLD) Column: Motorola([Mode2.Number],NEW) Column: Motorola([Mode3.Number],OLD) Column: Samsung([Mode2.Number],NEW) I need to create 2 excel out of this. One should 've all the information of the OLD and the second excel should've all the information of NEW. So my output excel should contain First Excel Nokia([Model1.Number]) Motorola([Mode1.Number]) Motorola([Mode3.Number]) Second Excel Motorola([Mode2.Number]) Samsung([Mode2.Number]) Kindly help me.. Thanks in advance..

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• Linux - Bash Redirect a String to a file

  - by user3502786

  I wrote a simple script that is reading the file content and incrementing a a number inside this file, then i'm holding the change using awk, when i'm trying ro redirect the new String using '' the whole string is redirected in one line and not like the original was which is 4 lines. #!/bin/bash -x # This script is for Incrementing build numbers path=/home/RND/abrodov file=tst.txt tst=`cat $path/$file` printf "this is the content of the file before incrementing: \n $tst" newexpr=`awk '/^Build Number/{$4=$4+1;}1' /home/RND/abrodov/tst.txt` printf "\n the new content \n $newexpr" echo $newexpr > $path/$file This is the original file before running the script: Major Release Number = 4 Minor Release Number = 1 Service Pack Release Number = 2 Build Number = 22 This is the content after i used the script: Major Release Number = 4 Minor Release Number = 1 Service Pack Release Number = 2 Build Number = 23 I'm trying to figure out how can i redirect the text in the original format which is 4 lines.

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• Hash Functions. Commonly used method h(k) = k mod M,, Why we choose value of M to be prime no.

  - by RBA

  Hi, Please share the reason why in Hash Functions, the common method i.e. h(k) = k mod M... Why we choose the value of M to be always prime no. Thanks..

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• How to use correctly the comments in C/++

  - by Lucio

  I'm learning to program in C and in my stage, the best form to use correctly the comments is writing good comments from the beginning. As the comments are not just for that one understands better the code but others too, I want to know the views of all of you to reach a consensus. So what I want is that the most experienced users edit the following code as you please. (If it's unnecessary, delete it; If it's wrong, correct it; If needed, add more) Thus there'll be multiple answers with different syntax and the responses with the most votes will be taken as referring when commenting. The code to copy, paste and edit to your pleasure is: (And I remark again, just import the comments, not the code) /* This programs find 1 number in 1 file. The file is binary type and has integers in series. The number is integer type and it's entered from the keyboard. When finished the program, a poster will show the results: Saying if the number is in the file or not. */ #include <stdio.h> //FUNCTION 1 //Open file 'path' and closes it. void openf(char path[]) { int num; //Read from Keyboard a Number and it save it into 'num' var printf("Ready for read number.\n\nNumber --> "); fflush(stdin); scanf("%d",&num); //Open file 'path' in READ mode FILE *fvar; fvar=fopen(path,"rb"); //IF error happens when open file, exit of function if (fvar==NULL) { printf("ERROR while open file %s in read mode.",path); exit(1); } /*Verify the result of 'funct' function IF TRUE, 'num' it's in the file*/ if (funct(path,fvar,num)) printf("The number %d it is in the file %s.",num,path); else printf("The number %d it is not in the file %s.",num,path); fclose(fvar); } /*FUNCTION 2 It is a recursive function. Reads number by number until the file is empty or the number is found. Parameters received: 'path' -> Directory file 'fvar' -> Pointer file 'num' -> Number to compare */ int funct(char path[],FILE *fvar,int num) { int compare; //FALSE condition when the pointer reaches the end if (fread(&compare,sizeof(int),1,fvar)>0) /*TRUE condition when the number readed is iqual that 'num' ELSE will go to the function itself*/ if (compare!=num) funct(path,fvar,num); else return 1; else return 0; } int main(int argc, char **argv) { char path[30]="file.bin"; //Direction of the file to process openf(path); //Function with algorithm return 0; }

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• What could cause a Labwindows/CVI C program to hate the number 2573?

  - by Adam Bard

  Using Windows So I'm reading from a binary file a list of unsigned int data values. The file contains a number of datasets listed sequentially. Here's the function to read a single dataset from a char* pointing to the start of it: function read_dataset(char* stream, t_dataset *dataset){ //...some init, including setting dataset->size; for(i=0;i<dataset->size;i++){ dataset->samples[i] = *((unsigned int *) stream); stream += sizeof(unsigned int); } //... } Where read_dataset in such a context as this: //... char buff[10000]; t_dataset* dataset = malloc( sizeof( *dataset) ); unsigned long offset = 0; for(i=0;i<number_of_datasets; i++){ fseek(fd_in, offset, SEEK_SET); if( (n = fread(buff, sizeof(char), sizeof(*dataset), fd_in)) != sizeof(*dataset) ){ break; } read_dataset(buff, *dataset); // Do something with dataset here. It's screwed up before this, I checked. offset += profileSize; } //... Everything goes swimmingly until my loop reads the number 2573. All of a sudden it starts spitting out random and huge numbers. For example, what should be ... 1831 2229 2406 2637 2609 2573 2523 2247 ... becomes ... 1831 2229 2406 2637 2609 0xDB00000A 0xC7000009 0xB2000008 ... If you think those hex numbers look suspicious, you're right. Turns out the hex values for the values that were changed are really familiar: 2573 -> 0xA0D 2523 -> 0x9DB 2247 -> 0x8C7 So apparently this number 2573 causes my stream pointer to gain a byte. This remains until the next dataset is loaded and parsed, and god forbid it contain a number 2573. I have checked a number of spots where this happens, and each one I've checked began on 2573. I admit I'm not so talented in the world of C. What could cause this is completely and entirely opaque to me.

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• Your server administrator has limited the number of items you can open simultaneously.

  - by Kez

  I receive the following sync error in Outlook 2007 SP2: Your server administrator has limited the number of items you can open simultaneously. Try closing messages you have opened or removing attachments and images from unsent messages you are composing. It is stopping me updating another user's calendar, which is open within my Outlook. Change are simply not syncing, either way. Is there a fix for this, e.g. increasing the number of permitted connections on the Exchange Server? We are using Exchange Server 2007 on a domain.

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• What does the number after 7-zip's -m switch mean?

  - by AndreKR

  7-zip has a command line switch to set the compression method, -m followed by a number, e.g. -m0=LZMA. What does the number (0 in the example) mean? Different numbers produce slightly different compression results and performance: time 7z -m0=LZMA -mx=9 -ms=on -mmt=off real 0m2.292s user 0m2.190s sys 0m0.080s time 7z -m1=LZMA -mx=9 -ms=on -mmt=off real 0m2.405s user 0m3.240s sys 0m0.070s time 7z -m0=LZMA -mx=9 -ms=on -mmt=on real 0m1.038s user 0m1.920s sys 0m0.150s time 7z -m1=LZMA -mx=9 -ms=on -mmt=on real 0m1.187s user 0m2.800s sys 0m0.130s

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• passing value of index number to different php file.

  - by tooepic

  hi, i am a php beginner and have a question for you please. i have a text file with list of first and last names like this: john,smith sam,lewis david,davidson mike,anderson in my sort.php file, it sorts that name list by first name in ascending order with index number, which will display like this: 1. david,davidson 2. john,smith 3. mike,anderson 4. sam,lewis also, in that sort.php file, there's a form for input type=text where you can type index number and a button to delete that index number entered in that text field: <form action="deletename.php" method="post"> <table> <tr valign="top"> <td>Delete: <input type="text" size="2" name="indexnumber" /> </td> <td> <div align="left"> <input type="submit" name="delete" value="Delete" /> </div> </td> </tr> </table> </form> now the question...is there anything i can do in that form to send the value of that index number i entered in the text field? in other word...if i enter 3, what can i do to that form to send the value "mike,anderson" to deletename.php? thanks in advance.

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• What is the maximum number of virtualhosts Apache can handle?

  - by FractalizeR

  Hello. What is the maximum number of VirtualHosts Apache can handle on a single machine (I don't mean anything related to load, let's suppose it's irrelevant for the question). And we take only Apache without any proxifying things like nginx. I am asking because on one forum one guy reported that his Apache works unstable with the number of sites more than 400 on a single machine. If you have a config, that handles more than 400, please tell me here. Thanks.

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• Windows Server 2008 Scheduled Tasks not running - 0x80041323 - Reduce Number of tasks running in the specified context?

  - by Mayb2Moro

  I am getting the following problem on a number of windows 2008 servers. 0x80041323 Task Scheduler failed to start task \Reporting" in TaskEngine "S-1-5-18:NT AUTHORITY\System:Service:" for user "NT AUTHORITY\System". User Action: Reduce the number of tasks running in the specified user context. I've done lots of research around the web but have been unable to come up with a working answer. I have found some information suggesting increasing a value in the registry key "TasksInMemoryQueue" which I have done, but even setting this as high as 500 has not helped. I have rebooted the server after setting this value. The server does run a high volume of Scheduled tasks, there could be 150 or so running at any one time, but certainly not 500. The scheduled tasks are all running under the system user. Does anyone have any ideas?

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• How to increase the number of items in the "recent" folder in Windows 7?

  - by netvope

  Windows 7 keeps a list of recently used files in C:\Users\<username>\AppData\Roaming\Microsoft\Windows\Recent. Based on my observation, it keeps 10 items for each file extension. So when you So open 11 .txt files in a row, the 2nd to the 11th items will stay in that Recent folder, but the first one will be gone. My question is: How to keep an unlimited number of items in that Recent folder? Note: Increasing the per-application recent items (e.g. as in http://www.mydigitallife.info/2009/05/21/change-increase-or-decrease-number-of-recent-or-frequent-items-displayed-in-windows-7-taskbar-jump-list/ ) has no effect on the per-user Recent item folder that I'm concerning.

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• How to know the number of CPUs and spec for each CPU/Core in Ubuntu Karmic?

  - by Viet

  How to know the number of CPUs and spec for each CPU/Core in Ubuntu Karmic?

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• Is there a limit for the number of files in a directory on an SD card?

  - by jamesh

  I have a project written for Android devices. It generates a large number of files, each day. These are all text files and images. The app uses a database to reference these files. The app is supposed to clear up these files after a little use (perhaps after a few days), but this process may or may not be working. This is not the subject of this question. Due to a historic accident, the organization of the files are somewhat naive: everything is in the same directory; a .hidden directory which contains a zero byte .nomedia file to prevent the MediaScanner indexing it. Today, I am seeing an error reported: java.io.IOException: Cannot create: /sdcard/.hidden/file-4200.html at java.io.File.createNewFile(File.java:1263) Regarding the sdcard, I see it has plenty of storage left, but counting $ cd /Volumes/NO_NAME/.hidden $ ls | wc -w 9058 Deleting a number of files seems to have allowed the file creation for today to proceed. Regrettably, I did not try touching a new file to try and reproduce the error on a commandline; I also deleted several hundred files rather than a handful. However, my question is: are there hard limits on filesize or number of files in a directory? am I even on the right track here? Nota Bene: The SD card is as-is - i.e. I haven't formatted it, so I would guess it would be a FAT-* format. The FAT-32 format has hard limits of filesize of 2GB (well above the filesizes I am dealing with) and a limit of number of files in the root directory. I am definitely not writing files in the root directory.

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• How does a client find the port number of a server?

  - by Jonathan

  Hello all, I am currently learning about basic networking in java. I have been playing around with the server and client relationship between two of my computers. However, I cannot figure out how distributed programs (say, a videogame), can not only find the 'host' computer, but also the port number on which the server is running in order to create a Socket between the two computers. The only way I really see to create a Socket is with an already known IP Address, and with a known port number. How do you search a LAN network for another computer (host) searching for clients? How do you determine what port the server is located on without 'pinging' all available ports for a response (which, I understand, is bad form... Something about 'server attack'...)? In such a situation as a video game, there can be any number of computers on the same network, and any number of them might be attempting to host, or otherwise running the application. Any other important information, or perhaps reference to a more detailed tutorial than the one I am using, regarding making connections on so very little information on the client side would be appreciated. Many thanks, Jonathan

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• (Oracle) How get total number of results when using a pagination query?

  - by BestPractices

  I am using Oracle 10g and the following paradigm to get a page of 15 results as a time (so that when the user is looking at page 2 of a search result, they see records 16-30). select * from ( select rownum rnum, a.* from (my_query) a where rownum <= 30 ) where rnum > 15; Right now I'm having to run a separate SQL statement to do a "select count" on "my_query" in order to get the total number of results for my_query (so that I can show it to the user and use it to figure out total number of pages, etc). Is there any way to get the total number of results without doing this via a second query, i.e. by getting it from above query? I've tried adding "max(rownum)", but it doesn't seem to work (I get an error [ORA-01747] that seems to indicate it doesnt like me having the keyword rownum in the group by). My rationale for wanting to get this from the original query rather than doing it in a separate SQL statement is that "my_query" is an expensive query so I'd rather not run it twice (once to get the count, and once to get the page of data) if I dont have to; but whatever solution I can come up with to get the number of results from within a single query (and at the same time get the page of data I need) should not add much if any additional overhead, if possible. Please advise. Here is exactly what I'm trying to do for which I receive an ORA-01747 error because I believe it doesnt like me having ROWNUM in the group by. Note, If there is another solution that doesnt use max(ROWNUM), but something else, that is perfectly fine too. This solution was my first thought as to what might work. SELECT * FROM (SELECT r.*, ROWNUM RNUM, max(ROWNUM) FROM (SELECT t0.ABC_SEQ_ID AS c0, t0.FIRST_NAME, t0.LAST_NAME, t1.SCORE FROM ABC t0, XYZ t1 WHERE (t0.XYZ_ID = 751) AND t0.XYZ_ID = t1.XYZ_ID ORDER BY t0.RANK ASC) r WHERE ROWNUM <= 30 GROUP BY r.*, ROWNUM) WHERE RNUM > 15

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• In Varnish, is it normal for the number of freed bytes to be 60% of those allocated?

  - by user331397

  I have an installation of Varnish 3.02 on an Amazon EC2 Medium Linux instance in front of two relatively low-traffic websites. After an uptime of 2 hours, there are 3400 objects in the cache. Using varnishstat, I checked the variables SMA.s0.c_bytes and SMA.s0.c_freed, which I assume correspond to the total number of bytes allocated since startup and the number freed, respectively. No objects should have had time to expire during these two hours, but still about 60% of the memory allocated since startup (330MB out of 560MB) has already been freed. Do you know if this is normal? If not, do you know what kind of configuration could be wrong?

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• How can I lookup data about a book from its barcode number?

  - by Joel Spolsky

  I'm building the world's simplest library application. All I want to be able to do is scan in a book's UPC (barcode) using a typical scanner (which just types the numbers of the barcode into a field) and then use it to look up data about the book... at a minimum, title, author, year published, and either the Dewey Decimal or Library of Congress catalog number. The goal is to print out a tiny sticker ("spine label") with the card catalog number that I can stick on the spine of the book, and then I can sort the books by card catalog number on the shelves in our company library. That way books on similar subjects will tend to be near each other, for example, if you know you're looking for a book about accounting, all you have to do is find SOME book about accounting and you'll see the other half dozen that we have right next to it which makes it convenient to browse the library. There seem to be lots of web APIs to do this, including Amazon and the Library of Congress. But those are all extremely confusing to me. What I really just want is a single higher level function that takes a UPC barcode number and returns some basic data about the book.

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• Count the Number of Characters in a Full FIle Path?

  - by Richie086

  I need to be able to count the number of characters in a full path to a file in windows. How I am currently accomplishing this task is as follows: Open a command prompt cd to the directory in question (for example c:\CruiseControl\ProjectArtifacts\ProjectName) type the following command dir /s /b output.csv Open the resulting output.csv file in excel. use the =LEN() function in excel to count the number of characters per row as listed in the output.csv file. Does anyone know of an explorer shell extension, or some 3rd party tool that could preform this function without me having to manipulate the output from dir in excel? Is there some easier way to go about doing this? The root of the issue I am having is the ~260 character file path limit in Windows. I am trying to analyze which paths are approx ~260 characters so I can shorten them to avoid getting this error.

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