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• How to Implement chat application for Android?

  - by user396530

  I am working on a chat application for android. This chat application is for sending messages from one device to another using internet(GPRS,3G,etc) from this application. please tell me a way to implement this. I thought using web services is more data(internet) consuming and less efficient.is this right? I worked on server and client sockets. I ran both server and client classes in single device and messages can be transfered from client socket to server socket and vice versa.Now i want to message between two devices using server socket on web server and how to connect to server from Android Devices. please help me thank you very much.

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• Synchronizing Mysql Table Schema [on hold]

  - by user1122069

  I have some difficulty keeping track of my SQL changes in a text file in SVN. One solution that I am aware of is to put the SQL queries in files (1.sql, 2.sql...) and to manually load each file at the proper time. Besides missing commas, the process is too cumbersome when builds become more frequent. I have actually taken to asking a co-worker to send me his SQL changes on Skype and we just apply the changes immediately on our local, development, and production servers (using three PhpMyAdmin tabs). I have seen several GUI tools mentioned in similar questions on SO, but these are actually more work and less automated than the aforementioned methods. Is there any standardized process by which this is done in an automated way? I can only guess that large companies build their own mechanisms of keeping track of database schema changes (yet I can't find a word about it - maybe they use files?). This question was closed as off-topic on Stack Overflow, so I am re-posting it here.

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• Protecting the integrity of a game state while minimizing amount of data sent

  - by espais

  I'm developing a game in PHP/jQuery, and naturally have to be wary of any sort of data coming from the client. At present, I have tables of data representing the map (2D roguelike), monsters, items, and player(s). Initially, my thought was to simply package it all in a JSON object and send it every game tick, however when actually looking at the data I realized that's quite a large packet to be sending. So, my question is what is a good approach for minimizing data sent to the client? Obviously I would need to figure out some way of validating whatever it sends back. Initially we'd hoped to do some minimal verification on the client-side, but each time we thought of one thing we could do it is immediately invalidated with tools like Firebug. Kind of an open question I realize, but we want to get this right before we move on with our implementation so we don't have to shoehorn in bugfixes later on.

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• Landscape-like tool to distribute security upgrades to OS?

  - by Ichikata

  i'm looking for an alternative to Landscape, Spacewalk (for RHEL), or CTL to perform a specific job. I need to control and apply OS upgrades on ubuntu systems, for 100+ servers, and so far i wasn't that lucky. I've tried Approx tool (similar to apt-proxy), but it just caches the content, and what i really need to do is set update milestones, apply the upgrades to QA servers, validate, then Stage environment, and so on to Production. I hope I was clear enough, any answer will be much appreciated.

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• What's the difference between 'service' and 'server'?

  - by bonefisher

  I can imagine that the 'server' can be a machine/host but can be also a program like ftp server, smtp server, etc.. The 'service' on the other hand refers mainly to applications/programms.. Why can then for example the Sql Server cannot be called as Sql Service? It has the same semanthics. Or the other way round: MS Azure service: why it isn't called Azure Server? :)

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• Windows Azure Active Directory: Should You Use It?

  Computerworld offers a full review of the developer preview version of WAAD. Jonathan Hassell, the review's author, effectively gave the service a grade of incomplete. While you can't expect something that's effectively a beta to include everything that will be in the final version, WAAD presented a number of annoying problems that definitely need fixing before it can attract a wide share of the market. First, you can't even try out the service unless you sign up for a trial of Office 365, Microsoft's cloud Office suite. The software giant does plan to let you bring up an instance of WAAD as...

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• Oracle Virtual Compute Appliance Launch Channel Update Webcast - May 28

  - by Roxana Babiciu

  Join us for an Oracle Virtual Compute Appliance (OVCA) launch update for the channel. This training webcast is a follow up to the OVCA launch on April 16. We will provide a brief product overview of OVCA followed by some great OPN program content, resell criteria, OPN Incentive Program and Demo Equipment Program details. There will be two sessions to accommodate each region. Additionally, don’t miss the latest Oracle Virtual Compute Appliance article packed with great information!

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• Domain resolution - local first then external

  - by stefgosselin

  I would like to know how I can configure my dns settings so that domain is resolved locally first, then if not resolved it goes to external DNS. I had this working before, I am using Ubuntu through a VM and need the local domain to resolve first but since I have upgraded I had to reconfigure network and now it works only external, local host file does not seem to even be used. Is there an easy way to check this out? I did slap it up in google but no specific answer seemed to match my case and I too tight on delivery deadline to test-and-try different approaches. You guys rock, thanks.

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• How To Install Windows Azure

  This tutorial assumes that you are familiar with the offerings that both Windows Azure and SQL Azure have to offer. If that is not the case, I recommend you visit the products features page located at: http://www.microsoft.com/windowsazure/features/. To begin, go to www.microsoft.com/windowsazure/sdk and click on the Get Tools amp; SDK button, shown below: Alternatively, you could choose to download the Standalone Windows Azure SDK or the Windows Azure AppFabric SDK, but that is beyond the scope of this article. Basically you would choose this option if you did not want to install the other ...

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• Top Exastack Partner Headlines - 7 Nov

  - by Roxana Babiciu

  R-Style Softlab recommends RS-solutions with Exadata and SuperCluster to improve business performance for their customers. Read more. WingArc, a subsidiary of 1st Holdings, Inc., finds Oracle Exadata’s substantial computing power enabling to their enterprise output management solution (SVF/RD). It helps solve the problem of providing an integrated output platform for high volume businesses. Read more.

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• comparing two tables [closed]

  - by sza

  I have two identical table ie all the columns are identical and one of the datatype is Text, one is varchar(255) and the rest are int. Lets say the table name is 'AAAAA'. Table AAAAA was processed and backed up earlier this month. Both the tables were storing data and now the second table is only storing data. I need to find unmatching records from the second table (BBBBB) which is storing data right now and add those records to Table AAAAA. Your help will be highly appreciated. I tried to use 'EXCEPT' but it does not support text datatype.

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• SQL Server 2008 System Functions to Monitor the Instance, Database, Files, etc.

  SQL Server provides several system meta data functions which allow users to obtain property values of different SQL Server objects and securables. Although you can also use the SQL Server catalog views or Dynamic Management Views to obtain much of this information, in some circumstances the system meta data functions simplify the process. In this tip I am going to demonstrate some of the available system meta data functions and their usage in different scenarios.

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• Memcached in a trusted shared environment?

  - by John Kary

  We are a university IT organization that hosts all of the university's websites on several shared servers on our server room floor. We have several VMs, each running its own instance of Apache as a web server for each respective server. If we were going to setup a memcached server, is it feasible to use it as a shared instance? If shared by several servers, or even multiple web apps running on the same server, what's the best way to keep each app's cache stores separate? Prefix the key? Would each VM require its own instance of memcached, or could we setup 1 memcached server and allow our multiple VMs to read/write to it?

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• sql connection problem only from another computer

  - by geoff

  I have a task that runs nightly. It connects to a sql server on our network and when I run it from my machine it runs fine. When it runs from the other computer I get the following error. System.Data.SqlClient.SqlException: An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) I've checked with our systems admin and he said nothing has changed on the sql box or on the box in question so I'm not sure why it runs fine from one and not the other. From what I've read about this error it sounds like it's a setting on the sql server that would disallow it to run on either box.

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• How to connect my APP to SQL Server?

  - by salhzmzm

  Hi I have 1 PC (MS Server 2003 + MS SQL Server 2008) and 2 PCs (MS SP2 + my APP) how I can let my APP connects to sql server 2008 on other PC My APP will connect to server to store data in SQL Server 2008 and read/delete/edit (basic operations) what is the best way to do that? NOTE: my APP is written in C# (.NET Platform)

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• Problem inserting in two different tables [closed]

  - by imvarunkmr

  I have written an insert statement which inserts a record into Table1. Table1 has a column "ID" which is an auto_increment(Identity) primary key. How can I fetch the newly generated "ID" and as I need to Insert this value as foreign key in Table2? Note : I have written INSERT statement in a stored procedure and I am calling this procedure using C# Alternative suggestions to link both tables are also welcomed :)

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• Helloooooooooooo, is anybody here?

  - by The Official Microsoft IIS Site

  Well, to start off with, we got a great response to our PHP survey and …. But wait, first things first, let us start off with introductions. I joined the team recently as the Program Manager for this driver. I’ve worked on several technologies in my career and very excited to be a part of this great team and look forward to working with you all, the PHP developer community! PHP and its ecosystem is new to me, so I’ve been ramping up over the last few months as well as helping the team as best I can...(read more)

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• ???????????????!??????????????

  - by Yusuke.Yamamoto

  ????? ??:2010/12/01 ??:?????? ????????????????????????????????????????????????????????????????IT??????????????????????????????????????????????????????????????????????????????????????????????Oracle Enterprise Manager 11g????????????????????? ????/ Oracle VM?Enterprise Manager?????????/ ????????????????????????????????????????????/ ???????????????&?????????????????/?????????????????????????????????????????? ????????? ????????????????? http://www.oracle.com/technology/global/jp/ondemand/otn-seminar/pdf/20101201_EM_VM_Managementv2.pdf

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• How to troubleshoot web server lock-up (Debian Squeeze)

  - by Ryan

  Every once in a while, my web server slows so significantly, it seems locked up. Can't SSH in, no sites being served. It's a VPS that started out as Debian 5 which I upgraded to testing (squeeze). It's a typical LAMP set-up with the sole purpose of running a couple of wordpress sites. One time when it locked up, I got to one of the sites, but it was wordpress complaining it couldn't establish a database connection. So it seemed as if something was really chewing up the CPU and mysqld either timed out, or possibly failed and couldn't restart. But since I couldn't SSH in I feel more inclined to attribute it to CPU. But the only processes running now, aside from OS and kernel stuff: apache mysqld python (for fail2ban) sshd exim4 It has 512M of RAM and 1.5 GB of swap. Every time I check on it, it has plenty of free memory and is using virtually no swap (usually 2-3M). And since I am running fail2ban I don't think I'm getting ddosed. I did find this in my logwatch email this morning (it locked up late last night, when there would have been very little traffic): 6 Time(s): [<ffffffff810a0ebc>] ? oom_kill_process+0x7e/0x23d 6 Time(s): [<ffffffff810a1505>] ? __out_of_memory+0x12a/0x141 6 Time(s): [<ffffffff810a1586>] ? out_of_memory+0x6a/0x94 I didn't find anything else suspicious. It can't be my provider's host because I can SSH in and restart the VM, and everything seems fine. Anybody know which logs I should start poring through to find the core of my problem? Thanks guys.

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• Problems migrating software RAID 5 to new server (linux)

  - by leleu

  I have a CentOS setup with sw RAID5 that holds my data. Well, the server died, so I bought another box to migrate my drives to. Only thing is, I cannot get the RAID array rebuilt (not even sure it needs rebuilding, might just need the /dev/md0 mapping created... but I don't even know how to determine what I need!) Some details: RAID5 software (used mdadm) 4x 250GB drives (2 are SATA, 2 are EIDE -- would this matter? It worked fine in the other box...) latest CentOS distro built using mdadm I've got a decent amount of experience with standard linux stuff, but the hardware level stuff runs me in circles. I've spent some time googling and elsewhere here on SF, so please be kind for my newbie questions :). My question is this: how can I diagnose the problem? For all I know, I'm using the wrong device blocks when I try to rebuild the array, but I can't find the command to display only the devices that have some physical attachment. Is there some simple way for me to run mdadm, having it scan over all my physical drives, and say "hey, drives 2,5,6,7 are a software array, want me to mount it?" I basically just took the drives from my old box and put it into my new one. They show up in the BIOS. What steps do I need to take in order to get the array up, running, and mounted? Thanks in advance!

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• SAN performance issues storing SQL Server tempdb on a SAN that's being backed up

  - by user42724

  I'm afraid I don't know much about SAN's so please forgive my lack of detail or technical terms. As a developer I've just completed and put on an existing production system a new application but it would appear to have tipped the scales regarding the performance of the backups being taken from the SAN. As I understand it there's a mirror of the SAN being taken usually constantly at the block-level. However, there seem to be so many new writes to the disk that the SAN mirroring/backup process can no longer keep up. I believe I've narrowed this down to SQL Servers tempdb which exists on a drive that contributes the largest portion of the problem! In fact I think tempdb has be contributing the largest portion of the issues all along regardless of my application! My question therefore is whether the tempdb should ever be mirrored or backed on the SAN and whether anyone else has gone through this sort of pain already? I'm wondering whether it's a best practise to make sure that tempdb is never mirrored on a SAN simply because any writes to it don't need to be saved. This also raises a slightly connected question - is it better to rely on SQL Servers built-in database backups tools (DB in full-recovery mode with full/differential and transaction log backups) or, as is the case with our application, SQL server is in simple recovery mode and never backed up since the SAN is mirrored and backed up? Many thanks

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• Exim log and send all mail for a given domain through another server

  - by Josh

  I administer a handful of shared web hosting servers. Recently, Yahoo has been deprioritizing/greylising all email sent from these servers. I am getting the dereaded 421 4.7.0 [TS02] Messages from my.ip.address temporarily deferred message from Yahoo and their postmaster has been unresponsive. I am unable to find any way to set up a feedback loop like AOL has for my IP address -- I did find a way to set up a feedback loop for a given domain, but we host hundreds of domains, and don't have the time to set up that many feedback loops. So what I'd like to do is twofold: Configure Exim to send all email destined to an @yahoo.com address to a relay, a new server which has an IP that yahoo is not blocking. Configure Exim (or maybe the relay) to log all emails sent to @yahoo.com, so I can review them and, in case one of my uses is violating ToS and sending SPAM to yahoo users, take the appropriate action. How could I accomplish these? Or, does anyone have any other advice for how to get mail to flow through Yahoo and ensure that any email generating complaints is brought to my attention? (For what it's worth, these servers are not listed on any major blacklists)

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• How to get html/css/jpg pages server by both apache & tomcat with mod_jk

  - by user53864

  I've apache2 and tomcat6 both running on port 80 with mod_jk setup on ubutnu servers. I had to setup an error document 503 ErrorDocument 503 /maintenance.html in the apache configuration and somehow I managed to get it work and the error page is server by apache when tomcat is stopped. Developers created a good looking error page(an html page which calls css and jpg) and I'm asked to get this page served by apache when tomcat is down. When I tried with JkUnMount /*.css in the virtual hosting, the actual tomcat jsp pages didn't work properly(lost the format) as the tomcat applications uses jsp, css, js, jpg and so on. I'm trying if it is possible to get .css and .jpg served by both apache and tomcat so that when the tomcat is down I'll get css and jpg serverd by apache and the proper error document is served. Anyone has any technique? Here is my apache2 configuration: vim /etc/apache2/apache2.conf Alias / /var/www/ ErrorDocument 503 /maintenance.html ErrorDocument 404 /maintenance.html JkMount / myworker JkMount /* myworker JkMount /*.jsp myworker JkUnMount /*.html myworker <VirtualHost *:80> ServerName station1.mydomain.com DocumentRoot /usr/share/tomcat/webapps/myapps1 JkMount /* myworker JkUnMount /*.html myworker </VirtualHost> <VirtualHost *:80> ServerName station2.mydomain.com DocumentRoot /usr/share/tomcat/webapps/myapps2 JkMount /* myworker JkMount /*.html myworker </VirtualHost>

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• High mysql server load, sar output

  - by eric

  I have a MySQL Server that should be performing better than it seems to be. We're running ubuntu on a Amazon Cluster Compute (cc1.4xlarge) Linux ip-10-0-1-60 3.2.0-25-virtual #40-Ubuntu SMP Wed May 23 22:20:17 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux Distributor ID: Ubuntu Description: Ubuntu 12.04 LTS Release: 12.04 Codename: precise I have several output files from sar that i'm not really sure how to interpret. For example, I ran: # Individual block device I/O activities sar -d 1 180 > logs/block_device_io.log & which gave me what looks like really high utilisation of my disk (turns out this block device maps to /dev/xvdh on /var/lib/mysql type ext4 (rw,_netdev) The output from my log: 10:48:59 PM DEV tps rd_sec/s wr_sec/s avgrq-sz avgqu-sz await svctm %util 10:49:00 PM dev202-16 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 10:49:00 PM dev202-32 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 10:49:00 PM dev8-0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 10:49:00 PM dev202-112 1008.00 31040.00 1416.00 32.20 1.02 1.01 0.89 90.00 10:49:00 PM dev202-80 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Am I wrong in thinking this is a problem? I have it above 90% almost the entire time we're seeing slowness. Or does this just mean MySQL is doing what it's supposed to do?

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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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