Daily Archives

Articles indexed Wednesday March 17 2010

facebook twitter digg google delicious technorati stumbleupon myspace wordpress linkedin gmail igoogle windows live tumblr viadeo yahoo buzz yahoo mail yahoo bookmarks favorites email print

Page 39/128 | < Previous Page | 35 36 37 38 39 40 41 42 43 44 45 46  | Next Page >

  • How to power a serial port under linux?

    - by Lex
    I got a serial to ethernet device connected to a Serial (COM) port on a Linux machine (debian etch), I connected it correctly but it did not power up, I suppose I need to power the device port, anyone knows how to power it under linux? Thankyou in advance.

    Read the article

  • How much effort is SQL Server 2008 Administration?

    - by Adrian Grigore
    Hi, I am looking for a suitable hosting environment for an ASP.NET MVC application. One of the options I have is renting a Hyper-V server and installing my license of SQL Server 2008 on it. I'm a bit wary of shared hosting since the one I have tried so far did not seem to have very consistent performance. One potential problem is that I would have I do not not know much about SQL Server administration, so I am not sure if this is a good option. I've been running a failover cluster of two linux dedicated servers for over 5 years now and MySQL never gave me any trouble. But that was Linux, and it might be different with a windows system. Is running a halfway efficient MS SQL Server 2008 difficult? Does it require any in-depth administration knowledge? Or perhaps recurring administration effort (such as keeping the server up to date with the latest patches)? Or is it rather an "install and forget" experience similar to MySQL?

    Read the article

  • Speed-up large number of files deletion on NTFS volumes

    - by sharptooth
    Every now and then I need to delete a folder containing something like 500k files from an NTFS volume. I do this with Windows Explorer. Since NTFS journals all the service data changes each deletion is carried out serially and so the whole 500k files deletion takes ages. I remember when I did the same in FAT32 it ran uncomparably faster. Is there any way to speed up deletion of large number of files on NTFS volumes?

    Read the article

  • Recover data from an ''unpartitioned'' hard drive

    - by Rafael S. Calsaverini
    I'm trying to recover data from a hdd for a friend from work. He was using it on an old win98 PC (so I guess it was a FAT 16 filesystem). When he installed the drive on a new PC his Windows XP can't recognize the filesystem and give an error message saying that the drive is unformatted. I tried to mount the hdd under linux but no partitions appear to be associated with the drive (I have only /dev/sdb associated with that drive and no /dev/sdb1 or sdb2 etc). I've found many articles on the web on how to recover partitions (with scripts like dd and ddrescue) but how do I make it when I have no partitions and the system say my drive is unpartioned? Is it possible to create a new partition without loosing the data?

    Read the article

  • Get the text of an li element

    - by Deepak Prasanna
    <ul class="leftbutton" > <li id="menu-selected">Sample 1</li> <li>Sample 2</li> <li>Sample 3</li> <li>Sample 4</li> <li>Sample 5</li> </ul> I want to get the text of the li item which the id="menu-selected". Right now I am doing something like document.getElementById('menu_selected').childNodes.item(0).nodeValue Is there any simpler way of doing the same?

    Read the article

  • Adding LambaExpression to an instance of IQueryable

    - by Paul Knopf
    ParameterExpression parameter = Expression.Parameter(typeof(Product), "x"); MemberExpression Left = Expression.MakeMemberAccess(parameter, typeof(Product).GetProperty("Name")); ConstantExpression Right = Expression.Constant(value, typeof(String)); BinaryExpression expression = Expression.Equal(Left, Right); LambdaExpression lambada = Expression.Lambda<Func<Product, bool>>(expression, parameter); Now how do I add this lambada to an instance of an IQuerybale, lets say _query _query.Where(lambada.Compile());?

    Read the article

  • Delphi fsstayontop oddity

    - by TallGuy
    Here is the deal. Main form set to fsnormal. This main form is maximized full screen with a floating toolbar. Toolbar is normal form with style set to fsstayontop. Most fo the time this works as expected. The mainform displays and the toolbar floats over on top of it. Sometimes (this is a bugger to find a reproducable set of steps) when alt-tabbing to and from other apps (or when clicking the delphi app icon on the taskbar) the following symptoms can happen... When alt-tabbing away from the delphi app the floating topmost fsstayontop form stays on top of the other apps. So if I alt-tab to firefox then the floating menu stays on top of firefox too. When alt-tabbing from another app to the delphi app the flaoting menu is not visible (as it is behhind the fsnormal mainform). Is there a known bug or any hacks to force it to work? This also seems to happen most when mutliple copies of the app are running (they have no interaction between them and should be running in their own windows "sandbox"). It is as if delphi gets confused which window is meant to be on top and swaps them or changes the floating form to stayontopofeverything mode. Or have I misunderstood fsstayontop? I am assuming setting a form style to fsstayontop makes it stay on top of all other forms within the current app and not all windows across other running apps. Thanks for any tips or workarounds.

    Read the article

  • very slow bridge detection

    - by deddihp
    hello everyone, I have setup some bridge interface with 4 ethernet port. My problem is, when they detect some network topology change, the bridge really need a lot of time to have done it. Is there any solution, so the bridge can detect topology change faster ? thanks.

    Read the article

  • how to atomically claim a row or resource using UPDATE in mysql

    - by Igor
    i have a table of resources (lets say cars) which i want to claim atomically. if there's a limit of one resource per one user, i can do the following trick: UPDATE cars SET user = 'bob' WHERE user IS NULL LIMIT 1 SELECT * FROM cars WHERE user IS bob that way, i claim the resource atomically and then i can see which row i just claimed. this doesn't work when 'bob' can claim multiple cars. i realize i can get a list of cars already claimed by bob, claim another one, and then SELECT again to see what's changed, but that feels hackish. What I'm wondering is, is there some way to see which rows i just updated with my last UPDATE? failing that, is there some other trick to atomically claiming a row? i really want to avoid using SERIALIZABLE isolation level. If I do something like this: 1 SELECT id FROM cars WHERE user IS NULL 2 <here, my PHP or whatever picks a car id> 3 UPDATE cars SET user = 'bob' WHERE id = <the one i picked> would REPEATABLE READ be sufficient here? in other words, could i be guaranteed that some other transactions won't claim the row my software has picked during step 2?

    Read the article

  • WPF User Control loading twice

    - by deepak
    Hai am having a WPF user control, when i use that control in another window it loading twice, so its throwing exception for me, coz am having some function in usercontrol_loaded event, when it loading twice it throwing error, is there any other way to check if the usercontrol is loaded like that, else how to solve this issue.

    Read the article

  • Tomcat 6, JPA and Data sources

    - by asrijaal
    Hi there, I'm trying to get a data source working in my jsf app. I defined the data source in my web-apps context.xml webapp/META-INF/context.xml <?xml version="1.0" encoding="UTF-8"?> <Context antiJARLocking="true" path="/Sale"> <Resource auth="Container" driverClassName="com.mysql.jdbc.Driver" maxActive="20" maxIdle="10" maxWait="-1" name="Sale" password="admin" type="javax.sql.DataSource" url="jdbc:mysql://localhost/sale" username="admin"/> </Context> web.xml <?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <filter> <display-name>RichFaces Filter</display-name> <filter-name>richfaces</filter-name> <filter-class>org.ajax4jsf.Filter</filter-class> </filter> <filter-mapping> <filter-name>richfaces</filter-name> <servlet-name>Faces Servlet</servlet-name> <dispatcher>REQUEST</dispatcher> <dispatcher>FORWARD</dispatcher> <dispatcher>INCLUDE</dispatcher> </filter-mapping> <servlet> <servlet-name>Faces Servlet</servlet-name> <servlet-class>javax.faces.webapp.FacesServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>Faces Servlet</servlet-name> <url-pattern>/faces/*</url-pattern> </servlet-mapping> <session-config> <session-timeout> 30 </session-timeout> </session-config> <welcome-file-list> <welcome-file>faces/welcomeJSF.jsp</welcome-file> </welcome-file-list> <context-param> <param-name>org.richfaces.SKIN</param-name> <param-value>ruby</param-value> </context-param> </web-app> and my persistence.xml <?xml version="1.0" encoding="UTF-8"?> <persistence version="1.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"> <persistence-unit name="SalePU" transaction-type="RESOURCE_LOCAL"> <provider>oracle.toplink.essentials.PersistenceProvider</provider> <non-jta-data-source>Sale</non-jta-data-source> <class>org.comp.sale.AnfrageAnhang</class> <class>org.comp.sale.Beschaffung</class> <class>org.comp.sale.Konto</class> <class>org.comp.sale.Anfrage</class> <exclude-unlisted-classes>false</exclude-unlisted-classes> </persistence-unit> </persistence> But no data source seems to be created by Tomcat, I only get this exception Exception [TOPLINK-7060] (Oracle TopLink Essentials - 2.0.1 (Build b09d-fcs (12/06/2007))): oracle.toplink.essentials.exceptions.ValidationException Exception Description: Cannot acquire data source [Sale]. Internal Exception: javax.naming.NameNotFoundException: Name Sale is not bound in this Context The needed jars for the MySQL driver are included into the WEB-INF/lib dir. What I'm doing wrong?

    Read the article

  • ODBC: Mapping of literal type names in create table statements

    - by matthias-meyer
    I was wondering if data types in a a literal "create table" statement, executed over ODBC, are replaced with their database specific counterparts (platform is Windows/.Net/C#). I cannot find this feature in the ODBC docs, and there seems to be no list of literal "ODBC data types". However, I know that this works for Oracle, SQL Server and Access; the following statement is executed correctly, although the type LONGVARBINARY is no native type in all of these systems: CREATE TABLE (MYCOLUMN LONGVARBINARY) However, e.g. for Oracle the mapped native type depends on the used ODBC driver. Is this an undocumented feature? Is there a list of supported type names anywhere? Thanks!

    Read the article

  • Jdeveloper vs java/j2ee/js+extjs ?

    - by ssgam
    Hi All, i am new to the web development environment, having came from a unix/c environment. i've been recently asked to create a web app, which i thought would require postgresql, java/j2ee, and javascript for the client interface. as i had wanted a nicer gui, i've been reading up on extjs, which looks really nice to me. a colleague mentioned that the time needed time needed to learn all these various pieces is time consuming, and Jdeveloper seems to provide most of what we'd need (i was shown a demo, which appears to be able to generate some nice web interfaces). what are the pros and cons with the different approaches ? some i can think of: - jdeveloper is an integrated ide, which creates UI easily, tightly integrated with database. (pro) - jdeveloper will be heavier? (con) - wizard generated code may be harder to refactor ? (con) - java/j2ee/js+extjs needs to develop things from ground up (con) thanks in advance for sharing your experiences and thoughts ... sam

    Read the article

  • How to get some randomized concats based on 2 columns from 1 table?

    - by Nils Riedemann
    Hey folks, i have a large user Database (13k+), and for some reason i need to create random names. The users table has "first_name" and "last_name". Now i want to have 10 concats of full_name and last_name of two completely random rows. Is that even possible with SQL? My other idea was just to create a full_names and last_names table … but that would'nt be as much challenging. Oh, and it should not take up too much performance :) (so order by rand() is not an option ;))

    Read the article

  • Firebird sequence-backed ID shorthand

    - by pilcrow
    What do others do to simplify the creation of simple, serial surrogate keys populated by a SEQUENCE (a.k.a. GENERATOR) in Firebird = 2.1? I finc the process comparatively arduous: For example, in PostgreSQL, I simply type: pg> CREATE TABLE tbl ( > id SERIAL NOT NULL PRIMARY KEY, > ... In MySQL, I simply type: my> CREATE TABLE tbl ( > id INT NOT NULL PRIMARY KEY AUTO_INCREMENT, > ... But in Firebird I type: fb> CREATE TABLE tbl ( > id BIGINT NOT NULL PRIMARY KEY, > ... fb> CREATE SEQUENCE tbl_id_seq; fb> SET TERM !!; > CREATE TRIGGER tbl_id_trg FOR tbl > ACTIVE BEFORE INSERT POSITION 0 > AS > BEGIN > IF ((new.id IS NULL) OR (new.id <= 0)) THEN > BEGIN > new.id = GEN_ID(tbl_id_seq, 1); > END > END !! > SET TERM ; !! ... and I get pretty bored by the time I reach trigger definition. However, I routinely make SEQUENCE-backed ID fields for temporary, developement and throw-away tables. What do others do to simplify this? Work with an IDE? Run a pre-processing, in-house perl script over the DDL file? Etc.

    Read the article

  • Netbeans Intellisense for Rails

    - by irishfury
    Has anybody figured out a way to make the Netbeans intellisense for ruby and rails better? It either has too many options in the list (which I understand is a problem since it is a dynamic language). Or it has no options in the list, as if it is not dynamic enough to find everything. Are there any hacks to make it better, or is this just something that needs to be improved within the Netbeans source code? I'm currently using 6.8. Please spare me the posts about how I don't really need to use intellisense, and I should use vim or emacs. I'm sure the vim programmers are 10 times more productive than me with all their cool shortcuts, but I have no desire to learn these tools.

    Read the article

  • MemoryError when running Numpy Meshgrid

    - by joaoc
    I have 8823 data points with x,y coordinates. I'm trying to follow the answer on how to get a scatter dataset to be represented as a heatmap but when I go through the X, Y = np.meshgrid(x, y) instruction with my data arrays I get MemoryError. I am new to numpy and matplotlib and am essentially trying to run this by adapting the examples I can find. Here's how I built my arrays from a file that has them stored: XY_File = open ('XY_Output.txt', 'r') XY = XY_File.readlines() XY_File.close() Xf=[] Yf=[] for line in XY: Xf.append(float(line.split('\t')[0])) Yf.append(float(line.split('\t')[1])) x=array(Xf) y=array(Yf) Is there a problem with my arrays? This same code worked when put into this example but I'm not too sure. Why am I getting this MemoryError and how can I fix this?

    Read the article

  • How to improve Java perfomance on Informix for Windows

    - by Michal Niklas
    I have problem with performance of Java UDR functions on Informix on Windows. On this server I already have some functions in C and SPL. I chose one function to write it in those 3 languages and I measured performance of this function on test table. Function calculates some kind of checksum so it not use any db libraries etc. only string and math operations. I observed performance on 30k records with SQL like: select function(txt) from _tmp_perf_test and I changed function to 'function_c, function_spl or function_java. My performance tests showed that C function is the fastest, SPL function is about 5 times slower, where Java is 100 (one hundred!) times slower than C. I checked it few times and 1:100 ratio didn't improve. I changed Java function to simply return length of the string but even this do not help so it looks, that there is general problem with Java function invocation, because there was no difference in time between Java function that calculate checksum and Java function that returns length of the string. I increased JVM_MAX_HEAP_SIZE to 128 and it not helped too. I use IBM Informix Dynamic Server Version 11.50.TC6DE. The same test on Linux server: IBM Informix Dynamic Server Version 11.50.FC6 show more "normal" results, i.e. Java is slower from C and SPL but only 2 to 5 times. What can I do to improve Java performance on Informix server on Windows? More info about Java on servers: c:\Informix\extend\krakatoa\jre\bin>java -version java version "1.5.0" Java(TM) 2 Runtime Environment, Standard Edition (build pwi32dev-20081129a (SR9-0 )) IBM J9 VM (build 2.3, J2RE 1.5.0 IBM J9 2.3 Windows Server 2003 x86-32 j9vmwi3223-20081129 (JIT enabled) J9VM - 20081126_26240_lHdSMr JIT - 20081112_1511ifx1_r8 GC - 200811_07) JCL - 20081129 [root@informix11 bin]# ./java -version java version "1.5.0" Java(TM) 2 Runtime Environment, Standard Edition (build pxa64devifx-20071025 (SR6b)) IBM J9 VM (build 2.3, J2RE 1.5.0 IBM J9 2.3 Linux amd64-64 j9vmxa6423-20071005 (JIT enabled) J9VM - 20071004_14218_LHdSMr JIT - 20070820_1846ifx1_r8 GC - 200708_10) JCL - 20071025

    Read the article

facebook twitter digg google delicious technorati stumbleupon myspace wordpress linkedin gmail igoogle windows live tumblr viadeo yahoo buzz yahoo mail yahoo bookmarks favorites email print

< Previous Page | 35 36 37 38 39 40 41 42 43 44 45 46  | Next Page >