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  • Why do a small amount of add/deletes take several seconds in EF4?

    - by TomWij
    Using the Entity Framework 4. I have created a Code First database in the past and a piece of code needs to delete and add 16 objects, this takes 6 seconds each. That's 300+ ms for each query! The deletes/adds occur in a foreach scope and there is a SaveChanges() outside the foreach. In the above image you see that each takes 6 seconds, which is 34% of the time, for 16 calls. That doesn't sound normal to me... Why is this and how can I improve the performance? If there is no solution: Are there any workarounds I can use? It would be a pain to rewrite my project...

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  • How to remove the small of padding around the ListBoxItem?

    - by Darf Zon
    I'm styling a listBox. i'm trying to clear the margins, so I realized which it, I set the padding of the style to 0 (left padding). But I can still seeing some margin in it, and I need to have no margin in it? Does you know which would be the problem? <ListBox ItemsSource="{Binding Partitions}"> <ListBox.ItemsPanel> <ItemsPanelTemplate> <Canvas /> </ItemsPanelTemplate> </ListBox.ItemsPanel> <ListBox.ItemContainerStyle> <Style TargetType="ListBoxItem"> <Setter Property="Padding" Value="0"/> <Setter Property="Canvas.Top"> ... </Setter> </Style> </ListBox.ItemContainerStyle> I mean, I can see an extra space around the item and I can't handle it to modify to 0.

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  • How to pick random (small) data samples using Map/Reduce?

    - by Andrei Savu
    I want to write a map/reduce job to select a number of random samples from a large dataset based on a row level condition. I want to minimize the number of intermediate keys. Pseudocode: for each row if row matches condition put the row.id in the bucket if the bucket is not already large enough Have you done something like this? Is there any well known algorithm? A sample containing sequential rows is also good enough. Thanks.

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  • database design: table with large amount of columns (50+) or many sub tables with small amount of co

    - by Guillaume
    In our oroject we already have a lots of tables (100+). Some of them contains a lot of columns (50-100) and we are facing the need of adding more columns from time to time. What do you think is best - from maintenance and performance point of view - to split these huge tables in smaller entities or to keep the tables the way they are ? We are using an ORM tools, so we don't need to write custom request.

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  • How can we make the video play in a small view and also filling that whole view?

    - by wolverine
    I have added an imageView of size 300*300 into the interface in my ipad project. I can play the video fullscreen using MPMOviePlayerController. And I am trying to make it play in the imageView by using the following code. [imageView1 addSubview:moviePlayer.view]; [self.moviePlayer play]; Its playing but not as fullscreen and also not filling the whole imageview. Its kind of playing on the top quarter of the view and that too not the whole movie view - about lower right 60% only. How can I fix this? How can I make the movie play on the whole imageview like it plays on the full screen?

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  • What's a good way to add a large number of small floats together?

    - by splicer
    Say you have 100000000 32-bit floating point values in an array, and each of these floats has a value between 0.0 and 1.0. If you tried to sum them all up like this result = 0.0; for (i = 0; i < 100000000; i++) { result += array[i]; } you'd run into problems as result gets much larger than 1.0. So what are some of the ways to more accurately perform the summation?

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  • Why I am forced to write the (Data Constructor) name with first letter in small case?

    - by Optimight
    Why I am forced to write "liOfLi" in place of "LiOfLi"? Please guide. code in baby.hs LiOfLi = [ [1,3,4,5,6,8], [ 12, 13, 15, 16, 19, 20], [23, 24, 25, 45, 56] ] ghci response: ghci :l baby [1 of 1] Compiling Main ( baby.hs, interpreted ) Failed, modules loaded: none. ghci baby.hs:29:1: Not in scope: data constructor `LiOfLi' When changing the initial letter to smaller case code in baby.hs liOfLi = [ [1,3,4,5,6,8], [ 12, 13, 15, 16, 19, 20], [23, 24, 25, 45, 56] ] ghci response: ghci :l baby [1 of 1] Compiling Main ( baby.hs, interpreted ) Ok, modules loaded: Main. Following are the SO questions I refered but I failed to understand the rules/ logic and get the answer for (my) abovementioned question. Why does Haskell force data constructor's first letter to be upper case? the variable names need to be lowercase. The official documentation related to this is at haskell.org/onlinereport/intro.html#namespaces – (the SO comment by) Chris Kuklewicz

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  • Should I write small CGI scripts or a big, monolithic script?

    - by Space
    I am working on to create a web site to display some information about my system. This includes some graphs and some text information. For now I am creating different CGI scripts and calling them by creating links. A few days back one of my friends told me that instead of writting different CGI scripts, it's better to write single CGI script and create functions to call the part of code. I am confused. What do you prefer while creating a web site?

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  • Apriori Algorithm- what to do with small min.support?

    - by user3707650
    I have a question about the table beneath my question: If i was told that the given min.support=10%, how can i know what is the support count, by which i will use during the exercise? What i know is: that you take the number of transactions (8) and multiple it by the min.support: 8*(10/100)=0.8 the problem is that i get this number: 0.8, how can i use this support count during this example?? 0.8 is a number that will make me prune all combination set that i will build... please help me!!! TID A B C D E F G 10 1 0 1 0 0 0 1 20 1 1 1 1 0 1 1 30 0 0 0 0 0 0 1 40 0 0 1 0 0 1 1 50 0 0 0 1 1 0 0 60 0 1 1 0 1 1 0 70 0 0 0 0 1 1 0 80 0 0 1 0 1 1 1

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  • ¿Cómo utilizar 2º disco duro de Ubuntu?

    - by Lightday
    Recientemente he instalado Windows y Ubuntu 12.04. Tengo 2 discos duros ( 160 GB y 320 GB). Datos de la instalación: Partición Sistema de archivos Etiqueta Tamaño Punto de montaja /dev/sda1 ntfs Sistema Windows 21 GB ^/dev/sda2 extendida 128,54 GB /dev/sda5 Linux-swap Linux-swap 4,39 GB intercambio /dev/sda6 ext4 Sistema Linux 14,65 GB / /dev/sda7 ext4 Datos Linux 109,49 GB /home /dev/sdb1 ext4 Datos Linux 298.09 /opt Si pincho en la carpeta /home, me dice que hay 106 GB libres y es donde está la carpeta personal y puedo usar ese espacio del disco. Si pincho en la carpeta de /opt, no hay carpeta personal, ¿y como uso ese espacio del disco? Gracias.

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  • Error while installing netbeans

    - by Hridesh
    I tried to install NetBeans 7.2 from a downloaded .sh file, but experienced problems. Here's text from the Terminal, which shows what I did and what happened: hridesh@ubuntu:~$ cd Desktop/ hridesh@ubuntu:~/Desktop$ cd full\ netbeans\ 7.2\ for\ linux\ in\ .sh\ format/ hridesh@ubuntu:~/Desktop/full netbeans 7.2 for linux in .sh format$ chmod +x netbeans-7.1.2-ml-linux.sh hridesh@ubuntu:~/Desktop/full netbeans 7.2 for linux in .sh format$ ./netbeans-7.1.2-ml-linux.sh Configuring the installer... Searching for JVM on the system... Extracting installation data... Installer file /home/hridesh/Desktop/full seems to be corrupted Why does the message Installer file /home/hridesh/Desktop/full seems to be corrupted appear? Is this file actually corrupted or something else going wrong?

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  • DragonRise USB Gamepad not working

    - by Gaurav Butola
    I have a Gamepad which is not working, I say "not working" because I was playing Urban Terror and the game was not responding to the gamepad button presses. How do I get the gamepad to work? I tried it in some other games Torcs, SuperTuxKark, Enemy Territory.... but, Same, there is no response to any of the gamepad button presses. Here is the output of lsusb Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 003: ID 0079:0011 DragonRise Inc. Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub 003 on third line is my Gamepad.

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  • Pythonika installation error on ubuntu 12

    - by user1426913
    I have been following links: to install pythonika on ubuntu: How to install Pythonika on Ubuntu? I get error: $ sudo make -f Makefile.linux cc -c Pythonika.c -I/usr/local/Wolfram/Mathematica/9.0/SystemFiles/Links/MathLink/DeveloperKit/Linux/CompilerAdditions -I/usr/include/python2.7/ Pythonika.c: In function ‘PyUnicodeString’: Pythonika.c:109:5: warning: passing argument 1 of ‘PyUnicodeUCS4_FromUnicode’ from incompatible pointer type [enabled by default] /usr/include/python2.7/unicodeobject.h:464:23: note: expected ‘const Py_UNICODE *’ but argument is of type ‘short unsigned int *’ Pythonika.c: In function ‘python_to_mathematica_object’: Pythonika.c:411:13: warning: passing argument 2 of ‘MLPutUnicodeString’ from incompatible pointer type [enabled by default] /usr/local/Wolfram/Mathematica/9.0/SystemFiles/Links/MathLink/DeveloperKit/Linux/CompilerAdditions/mathlink.h:4299:1: note: expected ‘const short unsigned int *’ but argument is of type ‘Py_UNICODE ’ "/usr/local/Wolfram/Mathematica/9.0/SystemFiles/Links/MathLink/DeveloperKit/Linux/CompilerAdditions/mprep" Pythonika.tm -o Pythonikatm.c /bin/sh: 1: /usr/local/Wolfram/Mathematica/9.0/SystemFiles/Links/MathLink/DeveloperKit/Linux/CompilerAdditions/mprep: not found make: ** [Pythonikatm.o] Error 127

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  • Unable to boot: Missing Operating system

    - by Vivek S Panicker
    i had installed Ubuntu 11.10 along with the another Ubuntu 11.10 which already installed in my netbook. Later I formatted the partition I newly installed. Next time when I boot it went to Grub Rescue menu. I boot my system again with Ubuntu USB stick, Then I installed Boot repair package in USB and restored MBR and GRUB menu in hard disk. Now when I am restarting, I am getting a message Missing operating system, press any key to continue. Can somebody help me on this? Below is the output for sudo fdisk -l omitting empty partition (7) Disk /dev/sda: 160.0 GB, 160041885696 bytes 255 heads, 63 sectors/track, 19457 cylinders, total 312581808 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00058a60 Device Boot Start End Blocks Id System /dev/sda1 * 2048 204072287 102035120 83 Linux /dev/sda2 204072958 312580095 54253569 5 Extended /dev/sda5 310507520 312580095 1036288 82 Linux swap / Solaris /dev/sda6 308432896 310503423 1035264 82 Linux swap / Solaris Partition table entries are not in disk order Disk /dev/sdb: 4006 MB, 4006608896 bytes 124 heads, 62 sectors/track, 1017 cylinders, total 7825408 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0004d3df Device Boot Start End Blocks Id System /dev/sdb1 * 62 7818695 3909317 b W95 FAT32 Below is the output for sudo blkid /dev/loop0: TYPE="squashfs" /dev/loop1: LABEL="casper-rw" UUID="533defb1-f073-254a-b46f-7ca0ac1f4e0c" TYPE="ext2" /dev/sda1: LABEL="Ubuntu" UUID="6a141040-3ba8-457a-9de5-ad06e6057084" TYPE="ext4" /dev/sda5: UUID="3a7f62d6-9c65-4d12-a3b6-5d62b9710f7d" TYPE="swap" /dev/sda6: UUID="274da115-cec2-4418-a1af-88fe921e3670" TYPE="swap" /dev/sdb1: LABEL="PENDRIVE" UUID="EC22-6BE4" TYPE="vfat" File /boot/grub/grub.cfg # # DO NOT EDIT THIS FILE # # It is automatically generated by grub-mkconfig using templates # from /etc/grub.d and settings from /etc/default/grub # ### BEGIN /etc/grub.d/00_header ### if [ -s $prefix/grubenv ]; then set have_grubenv=true load_env fi set default="0" if [ "${prev_saved_entry}" ]; then set saved_entry="${prev_saved_entry}" save_env saved_entry set prev_saved_entry= save_env prev_saved_entry set boot_once=true fi function savedefault { if [ -z "${boot_once}" ]; then saved_entry="${chosen}" save_env saved_entry fi } function recordfail { set recordfail=1 if [ -n "${have_grubenv}" ]; then if [ -z "${boot_once}" ]; then save_env recordfail; fi; fi } function load_video { insmod vbe insmod vga insmod video_bochs insmod video_cirrus } insmod part_msdos insmod ext2 set root='(hd0,msdos1)' search --no-floppy --fs-uuid --set=root 6a141040-3ba8-457a-9de5-ad06e6057084 if loadfont /usr/share/grub/unicode.pf2 ; then set gfxmode=auto load_video insmod gfxterm insmod part_msdos insmod ext2 set root='(hd0,msdos1)' search --no-floppy --fs-uuid --set=root 6a141040-3ba8-457a-9de5-ad06e6057084 set locale_dir=($root)/boot/grub/locale set lang=en_US insmod gettext fi terminal_output gfxterm if [ "${recordfail}" = 1 ]; then set timeout=10 else set timeout=10 fi ### END /etc/grub.d/00_header ### ### BEGIN /etc/grub.d/05_debian_theme ### set menu_color_normal=white/black set menu_color_highlight=black/light-gray if background_color 44,0,30; then clear fi ### END /etc/grub.d/05_debian_theme ### ### BEGIN /etc/grub.d/10_linux ### if [ ${recordfail} != 1 ]; then if [ -e ${prefix}/gfxblacklist.txt ]; then if hwmatch ${prefix}/gfxblacklist.txt 3; then if [ ${match} = 0 ]; then set linux_gfx_mode=keep else set linux_gfx_mode=text fi else set linux_gfx_mode=text fi else set linux_gfx_mode=keep fi else set linux_gfx_mode=text fi export linux_gfx_mode if [ "$linux_gfx_mode" != "text" ]; then load_video; fi menuentry 'Ubuntu, with Linux 3.0.0-12-generic' --class ubuntu --class gnu-linux --class gnu --class os { recordfail set gfxpayload=$linux_gfx_mode insmod gzio insmod part_msdos insmod ext2 set root='(hd0,msdos1)' search --no-floppy --fs-uuid --set=root 6a141040-3ba8-457a-9de5-ad06e6057084 linux /boot/vmlinuz-3.0.0-12-generic root=UUID=6a141040-3ba8-457a-9de5-ad06e6057084 ro quiet splash vt.handoff=7 initrd /boot/initrd.img-3.0.0-12-generic } menuentry 'Ubuntu, with Linux 3.0.0-12-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os { recordfail insmod gzio insmod part_msdos insmod ext2 set root='(hd0,msdos1)' search --no-floppy --fs-uuid --set=root 6a141040-3ba8-457a-9de5-ad06e6057084 echo 'Loading Linux 3.0.0-12-generic ...' linux /boot/vmlinuz-3.0.0-12-generic root=UUID=6a141040-3ba8-457a-9de5-ad06e6057084 ro recovery nomodeset echo 'Loading initial ramdisk ...' initrd /boot/initrd.img-3.0.0-12-generic } ### END /etc/grub.d/10_linux ### ### BEGIN /etc/grub.d/20_linux_xen ### ### END /etc/grub.d/20_linux_xen ### ### BEGIN /etc/grub.d/20_memtest86+ ### menuentry "Memory test (memtest86+)" { insmod part_msdos insmod ext2 set root='(hd0,msdos1)' search --no-floppy --fs-uuid --set=root 6a141040-3ba8-457a-9de5-ad06e6057084 linux16 /boot/memtest86+.bin } menuentry "Memory test (memtest86+, serial console 115200)" { insmod part_msdos insmod ext2 set root='(hd0,msdos1)' search --no-floppy --fs-uuid --set=root 6a141040-3ba8-457a-9de5-ad06e6057084 linux16 /boot/memtest86+.bin console=ttyS0,115200n8 } ### END /etc/grub.d/20_memtest86+ ### ### BEGIN /etc/grub.d/30_os-prober ### ### END /etc/grub.d/30_os-prober ### ### BEGIN /etc/grub.d/40_custom ### # This file provides an easy way to add custom menu entries. Simply type the # menu entries you want to add after this comment. Be careful not to change # the 'exec tail' line above. ### END /etc/grub.d/40_custom ### ### BEGIN /etc/grub.d/41_custom ### if [ -f $prefix/custom.cfg ]; then source $prefix/custom.cfg; fi ### END /etc/grub.d/41_custom ###

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  • Black Screen When Booting From .VDI Image

    - by GTyler
    I have cloned a VirtualBox machine, which runs Ubuntu 11.04 32-bit as Guest OS. I now wish to transfer it to a new host machine running Windows Vista 32-bit. I’ve transferred the .vdi file and adjusted the name and memory. However when I boot it, the options to choose the Linux version came up: Ubuntu, with Linux 2.6.38-10-generic, Linux 2.6.38-10-generic(recovery mode) , Previous Linux versions, Memory test. Once I chose Linux 2.6.38 a black screen just appears with an underscore at the top. What should I do to get it to run? I don’t have my original machine near me now so I can only work with my .vdi image. My VB is version 4.0.10. I have tried cloning this VDI and also assigning a new UUID and making a new guest, but I still got the black screen. Thank you.

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  • Unable to connect to internet using mobile broadband through samsung mobile SGH-E720/SGH-E840

    - by amit
    I am trying to connect to Internet using Samsung corby Mate in Ubuntu 11.04 which shows using: $ lsusb Bus 005 Device 005: ID 04e8:663f Samsung Electronics Co., Ltd SGH-E720/SGH-E840 Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub The mobile broadband creates a connection but doesnt connect to internet. Mobile broadband fails to connect. Somehow on Internet I found scripts to connect to Internet, but now only browser can access it, Ubuntu Software center does not recognize this connection and when try to install any software it doesnt display active internet connection. I am using two chatscript & connection in /etc/ppp/peers & /etc/ppp respectively.

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  • mic on cam don't work

    - by ezz9
    the cam works. I pull up PulseAudio I can see it pick me up for 1sec then stops. don't work on Skype I've tried every USB port same thing it worked on 10.04 fine. but now I'm on 12.04 and it don't work. it is a logitech B500 desktop:~$ lsusb Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 002: ID 046d:0807 Logitech, Inc. Webcam B500 Bus 003 Device 002: ID 03f0:6104 Hewlett-Packard DeskJet 5650c Bus 005 Device 002: ID 046d:c51b Logitech, Inc. V220 Cordless Optical Mouse for Notebooks I have changed some setting in flash Player Settings Manager, I don't think it would affect it after all the cam is still working it's the microphone that freezes up, but thought I would tell you this, info is good.

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  • Logitech M515 does not work after upgrade to 12.04

    - by user877329
    After upgrading to 12.04, my Logitech M515 does not work here is some output from the terminal: lsusb Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 003: ID 0411:002a BUFFALO INC. (formerly MelCo., Inc.) Bus 001 Device 004: ID 055d:3021 Samsung Electro-Mechanics Co. Bus 002 Device 002: ID 413c:2005 Dell Computer Corp. RT7D50 Keyboard Bus 004 Device 002: ID 0582:0074 Roland Corp. EDIROL UA-25 Bus 005 Device 002: ID 046d:c52b Logitech, Inc. Unifying Receiver dmesg | grep Logitech [ 30.470528] logitech-djreceiver 0003:046D:C52B.0004: hiddev0,hidraw1: USB HID v1.11 Device [Logitech USB Receiver] on usb-0000:00:1d.3-2/input2 The cursor does not move. Also the mouse was working in 11.10 and is working in Windows NT 5.1.2600.

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  • Building Cloud Infrastructure? Don't Miss this Webcast with SEI

    - by Zeynep Koch
    WEBCAST: How did Oracle Linux Enable SEI to Save in Infrastructure Costs and Improve Business Response Date: Tuesday, October 30, 2012 Time: 9:00 AM PDT Using the Oracle technology stack, SEI, a leading provider of wealth management solutions, developed an innovative, global platform for its business. That platform is built on a highly integrated infrastructure, operating system, and middleware that allows the organization to scale with customer demand. In this Webcast, join SEI’s Martin Breslin as he discusses: Why and how SEI migrated from a mainframe-based infrastructure to an x86-based infrastructure on Oracle Linux Why SEI chose Oracle Linux, Oracle Enterprise Manager, and Oracle Real Application Cluster for its platform-as-a-service (PaaS) environment How Oracle Linux enabled SEI to save costs and improve response time Key success factors and lessons learned when deploying an enterprise cloud Speakers: Martin Breslin, Senior Infrastructure Architect, SEI Global Monica Kumar, Senior Director, Oracle Linux, Virtualization and MySQL Product Marketing  Register TODAY

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