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  • Best way to fetch data from a single database table with multiple threads?

    - by Ravi Bhatt
    Hi, we have a system where we collect data every second on user activity on multiple web sites. we dump that data into a database X (say MS SQL Server). we now need to fetch data from this single table from daatbase X and insert into database Y (say mySql). we want to fetch time based data from database X through multiple threads so that we fetch as fast as we can. Once fetched and stored in database Y, we will delete data from database X. Are there any best practices on this sort of design? any specific things to take care on table design like sharing or something? Are there any other things that we need to take care to make sure we fetch it as fast as we can from threads running on multiple machines? Thanks in advance! Ravi

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  • Drawing widgets (such as buttons) over QGraphicsView

    - by Aditya Bhatt
    How do I draw interactive widgets such as QButtons and Line Edits over a QGraphicsView? For ex, I have selected a region over an image in an image editing app which displays an image with QGraphicsView, and I want to annotate this region with a name. So I want to have a Line edit and two buttons (Cross and Tick) below this rectangular selection. How do I draw these? Sample code would be cool!

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  • Creating a C# webservice client having SoapParameterStyle as Bare as opposed to wrapped

    - by Pratik Bhatt
    I am trying to create a Soap Web Service Client using the Visual C# 2008 Express IDE. I Do that by Right-Clicking Project Name-Add service Reference. Everything is working out fine, and the client is being generated as follows [System.Web.Services.Protocols.SoapDocumentMethodAttribute("operationInfo", RequestElementName="mainInfoTag", RequestNamespace="http://www.example.com/test", ResponseElementName="Answer", ResponseNamespace="http://www.example.com/test", Use=System.Web.Services.Description.SoapBindingUse.Literal, ParameterStyle=System.Web.Services.Protocols.SoapParameterStyle.Wrapped)] [return: System.Xml.Serialization.XmlElementAttribute("somenewID")] public string storeWarrantyInformation(tagBelowMainInfoTag tag, out string somenewID, out string someotherID) As you can see, the method is marked with SoapParameterStyle.Wrapped, what this is does is that it does not create a class corresponding "mainInfoTag". The Questions I have is what determines the Client SoapParameterStyle in the proxy class. I would like to get SoapParamterStyle as Bare, so that I have access to the root XML element. Is there some setting I can specify in the IDE or through 'wsdl.exe' to make this happen.

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  • Fixing windows MBR without Vista Recovery CD

    - by Aditya Sehgal
    I had Windows Vista + Ubuntu running on my system. I deleted the ubuntu partitions from Windows. However, when I start the system, GRUB throws up an Error 22 (missing partition) and does not let me boot into Windows. The CD ROM on my laptop is fried and therefore I tried installing Ubuntu again using a USB install. However, the version Ubuntu 9.10 justs hangs in the load screen and does nothing. I do not have windows Vista Recovery CD (as it was a recovery partition in my laptop). What are the options I have? How do I fix this?

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  • Fixing windows MBR without Vista Recovery CD

    - by Aditya Sehgal
    I had Windows Vista + Ubuntu running on my system. I deleted the ubuntu partitions from Windows. However, when I start the system, GRUB throws up an Error 22 (missing partition) and does not let me boot into Windows. The CD ROM on my laptop is fried and therefore I tried installing Ubuntu again using a USB install. However, the version Ubuntu 9.10 justs hangs in the load screen and does nothing. I do not have windows Vista Recovery CD (as it was a recovery partition in my laptop). What are the options I have? How do I fix this?

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  • Explanation for kernel error - Eeeek! page_mapcount went negative

    - by Aditya Advani
    Internet says this is a genuine Kernel Bug but does anyone know what triggers it?? Server running CentOS x86_64 with kernel 2.6.27.24 Here is my crash output: [root@u15345757 httpdocs]# Message from syslogd@ at Thu Aug 6 01:42:22 2009 ... u15345757 kernel: [1145736.506380] Eeek! page_mapcount(page) went negative! (-1) Message from syslogd@ at Thu Aug 6 01:42:22 2009 ... u15345757 kernel: [1145736.517515] page pfn = d0a3 Message from syslogd@ at Thu Aug 6 01:42:22 2009 ... u15345757 kernel: [1145736.523814] page->flags = 10000000000083c Message from syslogd@ at Thu Aug 6 01:42:22 2009 ... u15345757 kernel: [1145736.532489] page->count = 2 Message from syslogd@ at Thu Aug 6 01:42:22 2009 ... u15345757 kernel: [1145736.538741] page->mapping = ffff88001f01a110 Message from syslogd@ at Thu Aug 6 01:42:22 2009 ... u15345757 kernel: [1145736.547924] vma->vm_ops = 0x0 Message from syslogd@ at Thu Aug 6 01:42:22 2009 ... u15345757 kernel: [1145736.554543] [ cut here ] Message from syslogd@ at Thu Aug 6 01:42:23 2009 ... u15345757 kernel: [1145736.564528] invalid opcode: 0000 [1] SMP Message from syslogd@ at Thu Aug 6 01:42:23 2009 ... u15345757 kernel: [1145736.564528] Code: 80 e8 22 51 fd ff 48 8b 85 90 00 00 00 48 85 c0 74 19 48 8b 40 20 48 85 c0 74 10 48 8b 70 58 48 c7 c7 10 7f 7d 80 e8 fd 50 fd ff <0f> 0b eb fe 8b 77 18 41 58 5b 5d 83 e6 01 f7 de 83 c6 04 e9 df Broadcast message from root (pts/3) (Thu Aug 6 01:49:29 2009): The system is going down for reboot NOW!

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  • Time drift in Cloud Server - need to mainpulate GRUB config

    - by Aditya Advani
    We are hosting a VPS on a popular host and are experiencing a regular time drift of several minutes a day forward (approx 7). Linux Kernel: 2.6.18-164.11.1.el5 GNU/Linux Distro: CentOS release 5.4 (Final) We reached out to our hosting provider and their support advised us " This is a known issue with Cloud Servers. To fix this you will need to add one line to your grub config located at: /boot/grub/menu.lst The line you need to add is: noapic nolapic divider=10 nolapic_timer This should correct this issue. You will need to restart after this is added in. " Because I am wary of manipulating grub, mostly I'm terrified that our server may fail to restart - I ask you guys, the pro *nix admins - where exactly in this file does the recommended insertion below: # line from 1&1 for time syncing issue (Case 5163) noapic nolapic divider=10 nolapic_timer go? Please specify where exactly, and whether the order of commands is or is not important. Why is the block below "title CentOS ..." indented? If someone could give me an overview of how this works or point me to a resource that's easy to follow, that's what I'm looking for immediately, a light overview or basic understanding of what I;m doing. If GRUB and bootloaders are a deep dark treasure trove of kernel hacking or something, that's great well-recommended in-depth resources are also very welcome. This is my current /boot/grub/menu.lst # grub.conf generated by anaconda # # Note that you do not have to rerun grub after making changes to this file #boot=/dev/sda # serial --unit=0 --speed=57600 terminal --timeout=5 serial console timeout=5 title CentOS (2.6.18-164.11.1.el5) root (hd0,0) kernel /boot/vmlinuz-2.6.18-164.11.1.el5 ro root=/dev/hda1 console=tty0 console=tty initrd /boot/initrd-2.6.18-164.11.1.el5.img MOST IMPORTANT: I need to know where in the file above it is appropriate to paste the suggested line so I can confidently restart my VPS after manipulating GRUB config

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  • Process killing trouble

    - by Aditya Singh
    I am trying to program a server software which involves a lot of testing on java / scala platform. Whenever i compile and execute the code. It starts listening on port 80. Sometimes i need to terminate it by Ctrl+C when it hangs. In that case, ubuntu is not freeing the port. So in order to run the process, i have to restart the machine. I see this at ps aux root 1924 0.0 0.0 5796 1660 pts/0 T 05:44 0:00 sudo scala - root 1925 0.2 1.5 491448 40796 pts/0 Tl 05:44 0:03 java -Xmx256M -Xms16M So process 1924 and 1925. I did sudo kill on both these. But then they keep on persisting even after a long time. sudo nmap -T Aggressive -A -v 127.0.0.1 -p 1-65000 Scanning localhost (127.0.0.1) [65000 ports] Discovered open port 80/tcp on 127.0.0.1 It means its still there ! sudo netstat --tcp --udp --listening --program tcp6 0 0 [::]:www [::]:* LISTEN 1925/java tcp6 0 0 ip6-localhost:ipp [::]:* LISTEN 1185/cupsd This means its 1925 - java How to kill it.

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  • Drive writing problem [closed]

    - by Aditya
    Ive a fat32 drive...when i save a file on it on linux . open it in windows the file is not visible...the space occupied by that file is also not accounted for...the vice versa is also true...any idea why??

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  • iptables rule to submit packets matching a specific negative rule

    - by Aditya Sehgal
    I am using netfilter_queue to pick up certain packets from the kernel and do some processing on them. To, the netfilter queue, I need all packets from a particular source except UDP packets with src port 2152 & dst port 2152. I try to add the iptable rule as iptables -A OUTPUT ! s 192.168.0.3 ! -p udp ! --sport 2905 ! --dport 2905 -j NFQUEUE --queue-num 0 iptables throw up an error of Invalid Argument. Querying dmesg, I see the following error print ip_tables: udp match: only valid for protocol 17 I have tried the following variation with the same error thrown. iptables -A OUTPUT ! s 192.168.0.3 ! -p udp --sport 2905 --dport 2905 -j NFQUEUE --queue-num 0 Can you please advise on the correct usage of the iptables command for my case.

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  • Multiple IP stacks

    - by Aditya Sehgal
    I have a linux box with two ethernet interfaces (eth0 & eth1) with two corresponding IPs. As per my understanding, currently they are served by 1 IP stack. Is it possible to install another IP stack with IP Stack 1 handling ethernet interface eth0 and the other IP stack handling eth1.

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  • Creating Routes using the second NIC in the box

    - by Aditya Sehgal
    OS: Linux I need some advice on how to set up the routing table. I have a box with two physical NIC cards eth0 & eth1 with two associated IPs IP1 & IP2 (both of the same subnet). I need to setup a route which will force all messages from IP1 towards IP3 (of the same subnet) to go via IP2. I have a raw socket capture program listening on IP2 (This is not for malicious use). I have set up the routing table as Destination Gateway Genmask Flags Metric Ref Use Iface IP3 IP2 255.255.255.255 UGH 0 0 0 eth1 If I try to specify eth0 while adding the above rule, I get an error "SIOCADDRT: Network is unreachable". I understand from the manpage of route that if the GW specified is a local interface, then that would be use as the outgoing interface. After setting up this rule, if i do a traceroute (-i eth0), the packet goes first to the default gateway and then to IP3. How do I force the packet originating from eth0 towards IP3 to first come to IP2. I cannot make changes to the routing table of the gateway. Please suggest.

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  • Apache2 SSL And Passenger Configuration Issue

    - by Aditya Manohar
    I have the following virtual hosts configuration blocks. <VirtualHost *:80> DocumentRoot /var/www/html/TestApp/public/ <Directory /var/www/html/TestApp/public/> Allow from all Options -MultiViews </Directory> </VirtualHost> NameVirtualHost *:443 <VirtualHost *:443> DocumentRoot /var/www/html/TestApp/public/ <Directory /var/www/html/TestApp/public/> Allow from all Options -MultiViews </Directory> SSLEngine on SSLCertificateFile /etc/pki/tls/certs/server.crt SSLCertificateKeyFile /etc/pki/tls/private/server.key </VirtualHost> I trying to serve a Rails App off Passenger on Apache. The Problem: The TestApp works fine with Apache and Passenger when not using SSL When I use https://, I see the contents of /var/www/html The path to TestApp is /var/www/html/TestApp Any help will be much appreciated.

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  • Time tracking similar to Paymo Plus on Debian

    - by aditya menon
    PaymoPlus is free (closed source but no fees) PaymoPlus sits in my System Tray all day, and records every window/tab I open I would like to know if a similar app exists for Debian. Paymo for Windows/Mac has the additional sweet feature of being able to drag and drop working windows/tabs and the time spent into the tasks, but one can live without this. I would at least need to know which tasks got how much time in a 'sum total' calculation so I can enter that time into my Paymo reporting. Any ideas? Paymo does have a desktop widget for Linux but it is a dumb (non-sentient) manual time entry tool, not like Paymo Plus automatically recording everything being done.

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