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• SQL Server Performance & Latching

  - by Colin

  I have a SQL server 2000 instance which runs several concurrent select statements on a group of 4 or 5 tables. Often the performance of the server during these queries becomes extremely diminished. The querys can take up to 10x as long as other runs of the same query, and it gets to the point where simple operations like getting the table list in object explorer or running sp_who can take several minutes. I've done my best to identify the cause of these issues, and the only performance metric which I've found to be off base is Average Latch Wait time. I've read that over 1 second wait time is bad, and mine ranges anywhere from 20 to 75 seconds under heavy use. So my question is, what could be the issue? Shouldn't SQL be able to handle multiple selects on a single table without losing so much performance? Can anyone suggest somewhere to go from here to investigate this problem? Thanks for the help.

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• IBM Bladecentre H Bootup

  - by Spence

  I have a bladecentre with blades, network and a SAN in a single rack. What I'd like to do is control the startup of the bladecentre so that when the rack is powered on that the blades will delay their bootup until the SAN is powered on correctly. Is this even possible? We have an AMM in the chassis if that helps. Basically we are looking into the reboot that occurs after power is restored to a UPS. I sincerely apologise for the noobness of this question, but I am a software guy trying to help :)

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• Best practices for re-IP'ing / migrating servers and applications

  - by warren

  Some of this question would be highly application-specific, but what approaches do you take when looking to migrate applications from one server/platform to another and servers form one network segment to another? For applications that can't be re-IP'd (many exist in this category), the general answer is to nuke and pave (or extend a clusterable application, then remove the segment that needs to be "moved"). For "normal" applications (httpd, mail, directory services, etc), what are the checks ou perform before, during, and after a move to ensure the health of the migrated app/server? An example with Apache: backup httpd conf directory change httpd conf files to use new IP address of server change (or add) IP of server restart Apache verify web server still serves pages reboot server verify environment comes back up healthy

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• Access losing db connections

  - by Dwight T

  I have a weird problem going on at work. People have been using MS Access to connect to sql server db and lately people are getting sporadic problems with connecting to the servers. It's not always the same users and it's not always a problem, which makes it a real pain to try to solve. One example of a related problem. A person has a linked table to a table and she would filter the table or write a query on the table to return where itemsku = 'ABCD1234'. It would return one record but the ItemSku LMKN7486 and everytime it would return the wrong record but consistently the wrong record so itemsku abcd1234 always returned LMNK7486 One would think it might be a driver problem, but it also could be a user problem. Just posting the question to see if anyone else has had similar senerios. Thanks

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• Why does changing the physical socket on your router cause delays?

  - by Josh Browning

  My question involves the delays involved with changing which physical socket your ethernet cable is connected to. I am aware that if you are connected to a router on a network and then change which physical socket on that router you are using you will gain very small additional delays initially. However I am curious as to what causes these delays. I originally thought it was to do with the infromation stored in the routing table and whether that was allocated to a specific socket on the router or not. Although, if your IP address is the same then I don't understand why there would be delays because I would of assumed that any information within the router was linked to an IP address rather than a physical socket.

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• LameUser trying - apache2 webserver authentication - IP range to access without pass prompt others with it

  - by Mikee

  I have (maybe silly) question regarding the apache2 webserver and security - I am trying to archieve this: Users connecting from 192.168.1.24 not to be prompted for password and allowed Others asked for username and password if correct then connect. I am trying to do this for the whole directory /var/www No matter whether I put the code into .htaccess file or in httpd.conf it doesn't work for me. Order deny,allow Deny from all AuthName "PassRequest" AuthType Basic AuthUserFile /var/.htpasswd Require valid-user Allow from 192.168.1.24 Satisfy Any If I try to connect to the page I am allowed from both the allowed IP or any other, If I remove the satisfy any line then I am prompted for password, if I remove the password too and try to connect from different IP I am NOT REFUSED ... is there some module that needs to be activated or why is the IP directive skipped ? It needs to be put in every folder or /var/www/.htaccess is enough ? can I just put it in httpd.conf instead or not ?? I spend last 4 hours trying to google up why it is acting like that, Any help will be highly appreciated :-))

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• Should root ever own files in my (linux) home directory?

  - by Darren Cook

  This question started off asking why my history file wasn't working properly. Then I noticed it was -rw------- 1 root root and hadn't been updated since 2012-09-11. I changed the ownership, problem fixed. But now I see some other files are owned by root: .gitconfig .pearrc .viminfo Can I safely change them to be owned by my normal user, not root? I'm scratching my head trying to work out if there is a downside, or a security consequence. Losing seven weeks history is actually quite painful, because I lean on it a lot (e.g. to remind how I last did an archive). Would it be reasonable to set up a cron job to email me if it finds any files in my home directory owned by anyone else but me? Rephrased: is there ever a good reason for root to own a file in my home directory?

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• Flushing disk cache for performance benchmarks?

  - by Ido Hadanny

  I'm doing some performance benchmark on some heavy SQL script running on postgres 8.4 on a ubuntu box (natty). I'm experiencing some pretty un-stable performance, even though I'm supposed to be the only one running on the machine (the same script on the exact same data might run in 20m and then 40m for no specific reason). So, remembering my distant DBA training, I decided I should flush the postgres cache, using sudo /etc/init.d/postgresql restart, but it's still shaky! My question: maybe I'm missing some caches in my disk/os? I'm using a netapp appliance as my storage. Am I on the right track? Do I even want to make sure I get repeatable performance before I start tuning?

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• What are the "must " security tools for small organizations ?

  - by Berkay

  One of my friend has started a company, it's a small-scale company that has a 40 workers.There is two guys also responsible for the security and IT related issues.He is managing the LAN, Webpage of the company, e-mail configuration, printer hardware modification, application deployment etc. In this point, to provide the security measures including access controls, authentication, web server security etc. Which tools do you use for securing, monitoring and controlling the system ? Are you paying for these tools or are they open source? This question is due to the security administrators requests to my friend.He offers to get some tools for the company and my friend hesitates to pay that much on them (what he mentioned me.)

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• Why does Google Reader use up so much memory?

  - by Ivo

  I'm running the dev version of Chrome and just found out I could see the memory usage of every tab (press shift + ESC to find out yourself). Turns out the Shockwave Flash plugin uses 240 MB of memory and 27% of CPU while having open Google Reader. Killing this page brings it down to 50 MB. I reckon it builts up after reading through about 100 feeds. So my question is: why does it take up so much memory and what should I do to diminish it? Why I care? I often don't restart my browser (or laptop for that matter) and keep the Google Reader tab open for long periods of time. The memory does start to add up that way. Plus I have the feeling, perhaps incorrect, that it slows things down as well looking at the CPU usage. Side note: using Chrome 4 on Windows 7 (32 bit)

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• Is it possible to run Modern UI Apps in Windows 7

  - by soandos

  It seems like a basic question, but is there a way to run Windows 8 (Modern Apps) in Windows 7 (without a VM, that seems like cheating)? My hunch is that it would be possible with some sort of hack, as the code is written in the same .Net languages as many other programs. The only issue would be intercepting the finger to corner gestures, but I am not sure how much is there really (is it just a location, or a special win API call). Is there software that can do this, or options that need to be changed to make this work?

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• LM Sensors always returning same (invalid) value for one temp sensor

  - by pkaeding

  I am trying to monitor the temp sensors on a server, and plot them using Cacti. I have lm-sensors installed and working correctly. For example, here is the output from sensors: % sensors acpitz-virtual-0 Adapter: Virtual device temp1: +26.8 C (crit = +100.0 C) temp2: +32.0 C (crit = +60.0 C) coretemp-isa-0000 Adapter: ISA adapter Core 0: +36.0 C (high = +105.0 C, crit = +105.0 C) coretemp-isa-0001 Adapter: ISA adapter Core 1: +42.0 C (high = +105.0 C, crit = +105.0 C) However, when I try to get this data via SNMP, I get only one sensor's temperature correctly, and another one always returns 100.000 C: % snmpwalk -Os -c public -v 1 10.8.0.18 -m ALL lmTempSensors lmTempSensorsIndex.1 = INTEGER: 0 lmTempSensorsIndex.2 = INTEGER: 1 lmTempSensorsDevice.1 = STRING: temp1 lmTempSensorsDevice.2 = STRING: temp1 lmTempSensorsValue.1 = Gauge32: 26800 lmTempSensorsValue.2 = Gauge32: 100000 So, my question is two-fold: Why is the second sensor that is returned by SNMP giving a value of 100 C (when it should be 32 C) Why are my CPU core sensors not being returned by SNMP?

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• Building a Social Networking website, should I have separate servers for certain parts of the site? [closed]

  - by Dylan Cross

  I have been working on building a social networking website, I'm pretty committed to this and I think I have something that could work out. I hope to be launching it January 1st, and so I have a question for server setup and such. Facebook has separate domain names/servers for their photos (and I don't know what else), so I would assume that by doing this it would help spread the server loads out. So I am wondering if it would make a very big difference in speed if I had my main server for basically everything, but had another server and such that the photos would be stored on and access them the same way that facebook does.

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• Installing Windows 8 over Windows 7 with Ubuntu installed using wubi (both on `C:\`)

  - by peat-ar

  Current state I'm using both - Ubuntu (installed via Wubi on the same drive as Windows) and Windows 7 - quite frequently. I just bought the upgrade to Windows 8 and was curious to try it out, however I'm quite insecure whether Windows 8's "secure boot" will exclude my current Ubuntu installation and if it's even possible to keep it. So... is there any way to upgrade to Windows 8 without overwriting Ubuntu? (I really don't want to reinstall it, as a lot of customization has been done here and taking backups and all would get pretty wearing (same case for Windows 7 - if possible, I'd like to keep my files)) This is not a dublicate of Installing Windows 8 over Windows 7 with Ubuntu installed using wubi? because this question only deals with the case when Ubuntu has been installed on (e.g.) D:\ (while Windows is being installed on C:\)

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• Visual Query Builder

  - by johnnyArt

  If been using "dbForge Query Builder" lately and I'm gotten used to the ease of building and testing a query, specially for those complex ones with inner joins, aliases and multiple conditionals. The expiry date of the trial is about to come, and while wanting to remain on the legal side for this I'd rather not pay the 50USD it costs (although I must say it's pretty cheap for what it does). So my question would be: Are there any free alternatives to replace this visual query builder? I've failed to find any and fear that my only two options are paying for it, or going to the dark side.

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• Which browsers support Window's Low Integrity level?

  - by Ian Boyd

  Normally i like running ie, but it's rendering speed at high-dpi is poor. More recently i've switched to Chrome, but it does not support high-dpi displays. i'm interested in trying other browsers, but they must support protected mode. Are there any other browsers, besides IE and Chrome, that support Mandatory Integrity Levels (i.e. protected mode)? Browsers that i do know about: Browser Protected Mode High-dpi Aware ============== =============== ============== Internet Explorer Yes Yes Chrome Yes No Firefox No No Opera No No Are there any other? And just as an fyi, the clear, unambiguous, non-argumentative, non-subjective, question is: Are there any browsers, aside from Internet Explorer, available for Windows, that run at the Windows Low Mandatory integrity level, and support high-dpi (i.e. non-96 dpi) displays?

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• Error with FTP since binding via httpcfg

  - by Linda

  I was in a similar posistion to this question and bound two IP addresses using httpcfg. Since doing this ftp does not seem to be working on IIS6 in Windows Server 2003. Any ideas what could be wrong? The command I ran was: httpcfg set iplisten -i xxx.xxx.x.x I get the following when I try to conenct via Filezilla: Error: Connection timed out Error: Failed to retrieve directory listing The log file is returning the following: #Software: Microsoft Internet Information Services 6.0 #Version: 1.0 #Date: 2009-08-17 13:54:05 #Fields: date time c-ip cs-username cs-method cs-uri-stem sc-status sc-win32-status 2009-08-17 13:54:05 91.85.70.17 Client [1]USER Client 331 0 2009-08-17 13:54:05 91.85.70.17 Client [1]PASS - 230 0 In the ftp site settings I have the site pointing to the IP address used using httpcfg and the port set to 21. Update: I can see a directory listing if I connect via the inbuilt commandline ftp client in wondows vista. If I try to connect via a windows explorer I start in the incorrect folder and no files are listed just directories.

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• Forward one RDP port on one machine to multiple external users at the same time

  - by matnagel

  We have a windows server 2003 machine with rdp service listening on the standard port 3389. For security reasons this port is not opened on the router, but we have freesshd service running and a remote admin can login via ssh and this port is forwarded to external port 33001 for the first external user. This works great. Now we have another admin who wants to work remote (he uses a different windows account, but needs to work on the same machine.) So this is basically a ssh port forwarding question. Will the other user be able to login at the same time using the same port 33001 ? Please keep in mind that there will be a second tunnel, and this second tunnel will also use the local port 3389 on the windows server.

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• Safari on Mac OS X Cache lasts after 'Empty Cache'

  - by Mitch

  So, I broke a website with some server changes oops. I roll back the changes I made, hit cmd-R, and oh noes, it is still broken. But I relax thinking, there must be something held in safari's cache so I press the handy 'Empty Cache' button. Hit cmd-R for refresh it is still broken. I'm really worried that I've done it and broken something bigtime. But first decide to check on a hand win xp computer, and voila it works. So the question is how do you "really" clear the cache w/o restart safari, I have many browser windows open a restart every time I make a server side change will ruin me. Any suggestions? Thanks!

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• Providing high availability and failover using MySQL on EC2

  - by crb

  I would like to have a highly-available MySQL system, with automatic failover, running on Amazon EC2 instances. The standard approach to solving this is problem Heartbeat + DRBD, but I've found a lot of posts suggesting DRBD doesn't work on EC2, though none saying exactly why. Obviously, a serial heartbeat or distinct network is out of the question in the virtualised environment. It would also be good to have the different servers be in different availability zones, but we're getting into a much harder problem there. What are peoples' opinion on having a high uptime solution in "the cloud"?

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• Specify Credentials to run Powershell Script to Query AD

  - by Ben

  I want to run a powershell script to query AD from a machine that is NOT on the domain. Basically I want to query to see if there is computer account already on the domain for this machine and create it if there is not. Because this has to happen before the machine joins the domain I assume I will need to specify some credentials to enable it to run. (I'm pretty new to Powershell, so apologies if this is a newbie question!) The script I am using to check the account is below, and then once this has run it will join the domain using the computername specified. Can you tell me how to specify some domain credentials to run this section of the script as? Cheers, Ben $found=$false $thisComputer = <SERVICE TAG FROM BIOS> $ou = [ADSI]"LDAP://OU=My Computer OU,DC=myDomain,DC=com" foreach ($child in $ou.psbase.Children ) { if ($child.ObjectCategory -like '*computer*') { If ($child.Name -eq $thisComputer) { $found=$true } } } If ($found) { <DELETE THE EXISTING ACCOUNT> }

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• Flash player, HD videos and games are choppy

  - by Aimad Majdou

  I have a problem with flash player. HD videos from Youtube or Vimeo and flash games do not play smoothly. I'm using Flash player 11, Windows 7 Sp1, and my graphic card is Intel GMA 4500. Device Manager shows me that all drivers are installed on my computer, so i don't have any problems with drivers. When I run Google chrome, Resource Monitor shows me 15% ~ 40 % of CPU Usage and 40% used Physical Memory, but when I watch a video on Youtube or play a Flash game, the Resource Monitor shows 70% - 90% CPU Usage. Also, when I run some HD Video (Frame width : 1920, Frame height : 1080) on my computer, Device Manager shows me 80% ~ 100% of CPU Usage. before I Reinstall Windows 7, HD Videos and flash games were play smoothly I hadn't any problem with them !! I hope all these informations are enough to answer my question.

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• Installing Java on a Virtual Private Server

  - by Martin Rowe

  I have recently managed to get my employer to pay for a vps. I teach and asked the vps provider to enable Perl, Python, Ruby, Tomcat and Java. They've done the first four (really quickly) but have got back to me asking which parts of Java I need. I think the Java Virtual Machine is a given but what other S/W do I need to get installed? I think by getting the vps I now have the chance to teach Enterprise Java and want to get into Java Message Server and Enterprise patterns. Can I get Glassfish installed or is that a silly question? What about servlets and beans? Thanks in anticipation Martin Rowe

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• What's using up my memory?

  - by Mehrdad

  I already know what's causing this -- it's the driver for FancyCache, which I'd installed myself. But as you can see, nothing in the screenshot tells me anything about this. I just happen to know. So the question is, if I didn't know this, how would I figure out what's using up so much of my RAM? (For reference: It's currently 1.7 GiB used, and the "missing" amount -- for FancyCache -- is 512 MiB. Clearly, that extra half-gigabyte not showing up anywhere I can see below.)

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• Permanent Routes Centos Questions

  - by user65053

  So with a little help I figured out how to setup these routes and I can set them in rc.local route add -net 208.82.236.0 netmask 255.255.255.0 dev ppp0 metric 1 route add -net 208.82.236.0 netmask 255.255.255.0 dev eth0 metric 10 my question is being that the first route is ppp0 as soon as I disconnect the modem the route is dropped how do I maintain the route or make it permanent so that next time the modem connects it will follow the route. Currently after ppp0 disconnects the route is dropped netstat -r Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface laxapx03.o1.com * 255.255.255.255 UH 0 0 0 ppp0 208.82.236.0 * 255.255.255.0 U 0 0 0 eth0 10.0.1.0 * 255.255.255.0 U 0 0 0 eth0 169.254.0.0 * 255.255.0.0 U 0 0 0 eth0 default 10.0.1.1 0.0.0.0 UG 0 0 0 eth0

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