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  • Major performance difference between two Oracle database instances

    - by jrdioko
    I am working with two instances of an Oracle database, call them one and two. two is running on better hardware (hard disk, memory, CPU) than one, and two is one minor version behind one in terms of Oracle version (both are 11g). Both have the exact same table table_name with exactly the same indexes defined. I load 500,000 identical rows into table_name on both instances. I then run, on both instances: delete from table_name; This command takes 30 seconds to complete on one and 40 minutes to complete on two. Doing INSERTs and UPDATEs on the two tables has similar performance differences. Does anyone have any suggestions on what could have such a drastic impact on performance between the two databases?

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  • Filesystem fragmentation on the level of set of files

    - by trismarck
    The file is stored in blocks by the file system. The block is the smallest amount of data the file system can assign to store a file. The classical definition of a fragmented file is that the file is stored in blocks that are 'scattered' (that are physically non-contiguous) around the hard drive. What I want to ask about is this second type of fragmentation I've came up with. Lets suppose we install a program. This program has very many files. When the program starts, the program always loads the contents of those files sequentially. Now, even if the hard disk is defragmented, there is still a possibility that the files (but not the blocks building up to files) will be scattered on the disk and thus the program launch time will be longer. Actually, this time could be longer due to defragmentation of the disk, as the defragmentation process not only glues fragmented files but also moves some files to optimize free space chunks. The questions: is the type of fragmentation I mentioned relevant for the file system? is it possible to remedy this kind of fragmentation and if yes, how would you do it? Also, I'm not sure if this question should belong to superuser or to serverfault (as I guess the filesystem fragmentation is more important in the server environment).

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  • Difference in regex between Python and Rubular?

    - by Rosarch
    In Rubular, I have created a regular expression: (Prerequisite|Recommended): (\w|-| )* It matches the bolded: Recommended: good comfort level with computers and some of the arts. Summer. 2 credits. Prerequisite: pre-freshman standing or permission of instructor. Credit may not be applied toward engineering degree. S-U grades only. Here is a use of the regex in Python: note_re = re.compile(r'(Prerequisite|Recommended): (\w|-| )*', re.IGNORECASE) def prereqs_of_note(note): match = note_re.match(note) if not match: return None return match.group(0) Unfortunately, the code returns None instead of a match: >>> import prereqs >>> result = prereqs.prereqs_of_note("Summer. 2 credits. Prerequisite: pre-fres hman standing or permission of instructor. Credit may not be applied toward engi neering degree. S-U grades only.") >>> print result None What am I doing wrong here?

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  • Set a row to follow my cursor anywhere in Calc

    - by NoCanDo
    How do I make a whole row follow wherever I am in the Calc document when I scroll down/up? I'm looking for something that keeps a row from moving, or to make it stay put. This is so that when I want to see other rows, this one locked row will stay in place and allow me to refer back to it on screen without having to scroll all the way back up to the top of the document. Normal: Scrolled down: Further scrolled down: You can see the row with the yellow background, (CD-Nr.|Title|Genre|Lang|CD) is following me as I scroll down. How is this done?

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  • Problem with Character Set

    - by Mahesh
    Hi, I am in a problem because of the character set. My client sent me a Oracle database 10g. And when i am going to run the scripts on that database it is giving me error that character set mismatch. I am not an Oracle expert. Can anyone please let me know What should i do? Thanks, Mahesh.

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  • How to set the transaction isolation level of a

    - by Michael Wiles
    How do I set the global transaction isolation level for a postgres data source. I'm running on jboss and I'm using hibernate to connect. I know that I can set the isolation level from hibernate, does this work for Postgres? This would be by setting the hibernate.connection.isolation hibernate property to 1,2,4,8 - the various values of the relevant static fields. I'm using the org.postgresql.xa.PGXADataSource

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  • How to set up a PRIVATE vimwiki on Dropbox.com

    - by Zongheng Yang
    Hi everyone, I assume those who are reading this page know what vimwiki and dropbox.com are and what they are for, so I might directly go into my confusion. The common way of setting a PRIVATE vimwiki on dropbox is simply let your vimwiki directories be under Dropbox folder (but not Dropbox/Public/ because it would be PUBLIC). Dropbox allows directly viewing html with dropbox.com/* url: for example a index.html can be accessed by url https://dl-web.dropbox.com/get/Wiki/html/index.html?w=bfead71a, being added after the file name a specified string, ?w=bfead71a. Hence, if inside index.html there is reference to A.html, which is located in the same folder index.html is in, it has to be accessed using some url like https://dl-web.dropbox.com/get/Wiki/html/index.html?w=SPECIFIED_STRING. But it is seemingly impossible to hack vimwiki in order to make the hrefs in converted htmls corrected in this way. Is there some approach that can resolve this problem? I hope I make myself clear. Had you any questions, please ask me for further explanations. Thank you!

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  • Set textbox focus in mobile safari

    - by Morgan
    Hey, i was wondering how to set the focus to a textbox in mobile safari. I've tried document.myForm.myTextArea.focus(); which works in regular safari, but it does not seem to work in mobile safari. To clarify, i want to set focus to a text box as soon as the user loads a page, and have the iphone keyboard pop up.

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  • Difference in linq-to-sql query performance using GenericRespositry

    - by Neil
    Given i have a class like so in my Data Layer public class GenericRepository<TEntity> where TEntity : class { [System.ComponentModel.DataObjectMethod(System.ComponentModel.DataObjectMethodType.Select)] public IQueryable<TEntity> SelectAll() { return DataContext.GetTable<TEntity>(); } } I would be able to query a table in my database like so from a higher layer using (GenericRepositry<MyTable> mytable = new GenericRepositry<MyTable>()) { var myresult = from m in mytable.SelectAll() where m.IsActive select m; } is this considerably slower than using the usual code in my Data Layer using (MyDataContext ctx = new MyDataContext()) { var myresult = from m in ctx.MyTable where m.IsActive select m; } Eliminating the need to write simple single table selects in the Data layer saves a lot of time, but will i regret it?

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  • Set default system audio output port (for all accounts)

    - by Ludwik Trammer
    The default output audio port Ubuntu doesn't work on my system. It should be "Analog Mono Output/Amplifier", instead of "Analog Output/Amplifier". I can easily change that in sound preferences, just by choosing the right port in the "Output" tab. The problem is this would only apply to a single account, and I would like to change it system-wide, so it applies to all accounts on the system (I have more than 100 users...). I'm after 2 hours of Googling, so any help would be appreciated.

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  • Good set of web hosting permissions?

    - by Jorge Israel Peña
    Hey guys, I just got a linode and I'm in the process of configuring it. It's running nginx with php-fpm and passenger. nginx was compiled and is running as user nginx. php-fpm (php with fastcgi process manager) is running as www-data (in group www-data). My sites are currently in /var/www, so for example /var/www/test.com I'm just wondering what the general 'flow' of things is. So for example, /var/www is owned by root, should I chown of /var/www/test.com to nginx or www-data? Or should I put nginx in the www-data group? How should site uploading work, I just transfer files to the /var/www/test.com directory as root (sudo) and then chown -R www-data:www-data .? Thanks. I'm capable of figuring things out on my own, I'm just wondering what the typical/general way of handling users/groups/permissions/site-files is on linux with a webserver.

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  • How to set the IP address in a customized OpenWRT compilation

    - by Berdus
    I have been struggling today customizing OpenWRT. I checkout the stable using SVN, "make menuconfig" to customize the image, "make" it and run it on a router. Almost all my modifications work, except for the (Seemingly trivial) task of changing the default 192.168.1.1 address. I tried numerous files (scripts as well as config files) but I can't seem to change it (I can change it for a brief moment after boot using the "preinit" file, but after a few seconds it reverts to default). I suspect I should be setting it in the /etc/network file, but modifications there seem to be overwritten during boot. Maybe it has something to do with the br-lan interface? Does anybody have some thoughts on the subject? Thanks!

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  • Can't delete keyboard shortcut set for a .ink file

    - by Sirhaian
    So, I installed the Chrome App Launcher on my PC (now on Win8.1) a few weeks ago, and, as I use it very often, I wanted to assign a keyboard shortcut for it. So, I right-clicked the icon on my desktop, and I assigned Ctrl+Alt+<. The problem is... I moved the shortcut to my taskbar, and suddenly noticed that when I wanted to write the "\" (on a Belgian keyboard), it launched the Chrome App Launcher, which is very annoying. I wanted to change it back, but I can't... I deleted the taskbar shortcut, but the keyboard shortcut still launches the App Launcher. I also tried creating a new shortcut with the same association, hoping that it would crush the existing one, but it didn't work. I searched on Google for similar issues, and I couldn't find any... x~x So... How can I delete this shortcut association..?

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  • Quickly set up a Windows Server and automatically install and configure software

    - by Chris
    Yesterday I spent far too much time downloading and installing software on Windows Server 2008. I only had to install a simple server for SQL Server 2008 Express using Microsoft's Web Platform Installer, then configure it to enable remote connections. Everything had to be attended, wasting my time. On a Linux system, this would be trivial to automate, but this is Windows. I do this very rarely, but in the future I would like to make this take as little time as possible. I could do a disc image with everything I installed and configured, but is there a better way? I know nothing of advanced deployment techniques on Windows. Ideally I would like to be able to remotely re-install the OS, or have an unattended install (which I know is possible). Any tips to make the software I need easier to and install and configure with minimal interaction necessary would be helpful. I don't expect everything I asked for to be possible and easy to do. Basically, If any part of it can be done quicker or at least without user input, that's what I'm looking for.

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  • Can we set parameter width manually, in SSRS?

    - by San
    Hi All, Is it possible to set the report parameter's width manullay in SSRS. I could see that the parameters are given the width by SSRS itself, and the XML coding is not having any attributes mentioning its width. I was wondering is there anything that we can add in to to set the report parameter's width? Thanks for your help all in advance. San

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  • how to set up dual wireless routers (G and N) with single broadband connection

    - by user15973
    A local cafe has an 802.11g wireless router attached to either an 8- or 12Mbs broadband connection. Although many customers still have -g devices, an increasing number are showing up with 802.11n devices (e.g. Mac laptops, iPads). The cafe owner is content with his router's area coverage, but he would like for his customers to be able to take advantage of the higher -n download speeds. He could simply replace the -g router with a -n router, but reportedly -n routers slow down considerably when servicing both -g and -n connections. Another option would be to buy the -n router, run an Ethernet cable between the two routers, and (of course) hook up the broadband connection to one of the two routers. Still another option would be to attach an ordinary, wired switch to the broadband connection and then attach both routers to the switch. Aside from the cost issue, what are the tradeoffs of those approaches? Which would you recommend, and why? Is there a better option than the ones I mentioned? Thank you in advance for your advice.

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  • How to allow user to set expressions detrmining property value in PropertyGrid

    - by savras
    I noticed that programs like Report Builder allow user to set property value or an expression determining property value. I want to the add same functionality to my application. So is there any simple way to do so or do i have to redefine all type converters so that they allow to set expression in addition to their original functionality. http://img204.imageshack.us/img204/7934/48707358.jpg

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  • How to share text, pictures and video to restricted set of users

    - by joaoc
    I want to share pictures and videos of my kid growing up but I don't want it to be open to the public. I just want me and my wife to be able to add material and then share with grandparents and friends who would be given a username/password or some other solution that authenticates them. This content would preferably be available remotely over the internet or downloaded periodically to the allowed viewers computers. The second option most likely means they would have to install a client, which I am not too fond of doing (I would have to ask them to install it, help configure for different platforms, ...) I'm at the start but I would like software that also allows export of the data (if one day I want to migrate to a different solution). Folder sharing I don't know if Windows folder sharing is reliable, robust and safe enough to share over the internet. Dropbox could be a software solution, but it's limited to 2GB and requires receivers to also install and configure software. A folder is just a collection of files, so it would be harder to keep them organized with text describing the pictures/video Email I could email the content every now and then but videos are almost always too big to go as attachments This would also not provide a history of updates to anyone just recently joining in Are there other solutions to achieve this? NOTE: I also thought that software to run a local or remote blog could be an option but we aren't allowed to ask those questions on superuser because one admin doesn't like cloud-computing questions. But if you do think it's the best approach and can suggest a solution, do state it in the answers anyway!

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  • Set custom mount point and mount options for USB stick

    - by kayahr
    Hello, I have an USB stick which contains private stuff like the SSH key. I want to mount this stick to my own home directory with 0700 permissions. Currently I do this with this line in /etc/fstab: LABEL=KAYSTICK /home/k/.kaystick auto rw,user,noauto,umask=077,fmask=177 0 0 This works great but there is one minor problem: In Nautilus (The Gnome file manager) the mount point ".kaystick" is displayed. I guess Nautilus simply scans the /etc/fstab file and displays everything it finds there. This mount point is pretty useless because it can't be clicked when the device is not present and it can't be clicked when the device is present (Because then it is already mounted). I know this is a really minor problem because I could simply ignore it but I'm a perfectionist and so I want to get rid of this useless mount point in Nautilus. Is there another way to customize the mount point and mount options for a specific USB device? Maybe it can be configured in udev? If yes, how?

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