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  • mysql 5.0.23 vs 5.5 performance benefits and upgrade issues ?

    - by WarDoGG
    I have been told that mysql 5.5 has a significant performanance boost compared to 5.0 Our server handles alot of data (around 30 million records processed per 5-10 seconds) and requires every drop of performance boost we can give. Will it be beneficial if we upgrade from 5.0.23 to mysql 5.5 ? Also, we have lots of database indexes setup on the tables and i've been told that sometimes the indexes become corrupt after a version upgrade and they have to be rebuilt. Is this true ?

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  • SSD redundancy via HDD

    - by Mascarpone
    Is there a way to guarantee redundancy to an SSD using an HDD? Raid 1 is the best choice to guarantee redundancy in HDDs, but SSDs are too expensive to guarantee redundancy via RAID. If I was to couple an SSD with an HDD, could I guarantee redundancy using the HDD as a failover device, and lazily mirroring the data on the HDD? (e.g.: every 5 minutes the data should be synchronized, rather than in real time like with Raid 1).

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  • New drivers, now switchable graphics won't work

    - by Glenn Andersson
    I have an ASUS notebook with dual AMD/ATI graphic cards. Before I've been able to switch individual programs in the Vision Control Center from high performance to energy saving and the other way around. But today I updated the drivers using the AMD Mobility to version 12.10, and now every time I try to configure switchable graphics it either shuts down or does not come up at all. I have a new menu item called Global Switchable Graphics settings though. Any thoughts on this?

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  • Referencing a specific figure in Microsoft Word 2003

    - by stanigator
    Referring to the screenshot below: I want to be able to reference the figure in the body of the text properly without having to change them manually every time I add a figure label before that body of text. However, I don't know how to do it aside from adding caption labels, which won't work for cases where I have more than one reference to the figure (at least I don't know how to do that properly anyway). How would you recommend accomplishing that? Thanks in advance!

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  • How to push configurations to multiple Cisco Switches

    - by nixda
    Assume I have around 50 Cisco IE2000 Switches connected together and I want to reconfigure some settings, the same settings for every switch. Normally I would open a command line session via Putty and paste the commands. But as the number of switches is growing, even this method takes its time. I am aware of Kiwi CatTools. Unfortunately it's not free so I'm wondering if there are other efficient ways to configure a large number of Cisco switches.

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  • iphone dictionary autocorrect [closed]

    - by Raj More
    I have the iPhone 3G with OS 3.1 3.0.1 on it. Every time I type a text message that includes the word "me", it gets auto corrected to "mr". So my friends get a text that says "call mr when you get done" or "jack told mr about it yesterday" how do i change this autocorrect so it stops changing my "me" to a "mr"?

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  • apache mod_cache in v2.2 - enable cache based on url

    - by Janning
    We are using apache2.2 as a front-end server with application servers as reverse proxies behind apache. We are using mod_cache for some images and enabled it like this: <IfModule mod_disk_cache.c> CacheEnable disk / CacheRoot /var/cache/apache2/mod_disk_cache CacheIgnoreCacheControl On CacheMaxFileSize 2500000 CacheIgnoreURLSessionIdentifiers jsessionid CacheIgnoreHeaders Set-Cookie </IfModule> The image urls vary completely and have no common start pattern, but they all end in ".png". Thats why we used the root in CacheEnable / If not served from the cache, the request is forwarded to an application server via reverse proxy. So far so good, cache is working fine. But I really only need to cache all image request ending in ".png". My above configuration still works as my application server send an appropriate Cache-Control: no-cache header on the way back to apache. So most pages send a no-cache header back and they get not cached at all. My ".png" responses doesn't send a Cache-Control header so apache is only going to cache all urls with ".png". Fine. But when a new request enters apache, apache does not know that only .png requests should be considered, so every request is checking a file on disk (recorded with strace -e trace=file -p pid): [pid 19063] open("/var/cache/apache2/mod_disk_cache/zK/q8/Kd/g6OIv@woJRC_ba_A.header", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) I don't want to have apache going to disk every request, as the majority of requests are not cached at all. And we have up to 10.000 request/s at peak time. Sometimes our read IO wait spikes. It is not getting really slow, but we try to tweak it for better performance. In apache 2.4 you can say: <LocationMatch .png$> CacheEnable disk </LocationMatch> This is not possible in 2.2 and as I see no backports for debian I am not going to upgrade. So I tried to tweak apache2.2 to follow my rules: <IfModule mod_disk_cache.c> SetEnvIf Request_URI "\.png$" image RequestHeader unset Cache-Control RequestHeader append Cache-Control no-cache env=!image CacheEnable disk / CacheRoot /var/cache/apache2/mod_disk_cache #CacheIgnoreCacheControl on CacheMaxFileSize 2500000 CacheIgnoreURLSessionIdentifiers jsessionid CacheIgnoreHeaders Set-Cookie </IfModule> The idea is to let apache decide to serve request from cache based on Cache-control header (CacheIgnoreCacheControl default to off). And before simply set a RequestHeader based on the request. If it is not an image request, set a Cache-control header, so it should bypass the cache at all. This does not work, I guess because of late processing of RequestHeader directive, see https://httpd.apache.org/docs/2.2/mod/mod_headers.html#early I can't add early processing as "early" keyword can't be used together with a conditional "env=!image" I can't change the url requesting the images and I know there are of course other solutions. But I am only interested in configuring apache2.2 to reach my goal. Does anybody has an idea how to achieve my goal?

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  • Why is the vSphere console view so slow?

    - by blade
    Hi, Why is the Console view on the vSphere client so slow? It's a real shame because it's a shame to have to establish an RDP session every time you work on one of the VMs because of the speed of the console (I saw a tool to right click and open an RDP session to a VM in vSphere Client/ESX but this was not reliable). The Workstation console view is very smooth so I'd expect the vSphere Client console view to be very smooth. Thanks

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  • D-Link DIR-300 slows down / loses network

    - by basic6
    Hi there, there are 2 buildings (A and B). In bldg A is an open WLAN (which I'm allowed to use btw). In bldg B is a computer that I want to connect to that network. So I flashed an old D-Link DIR-300 AP with DD-WRT, mounted it to the wall (bldg B) near a window, attached a 13 dBi directional antenna (pointing to bldg A) and configured it as AP client in that wireless network. Then there's another AP, connected to the D-Link AP, acting as standard access point, which the computer is connected to. That's basically working so far, but: Every now and then the connection is lost. Not the connection between the computer and the D-Link (I can access the DD-WRT admin page normally) or the connection between the D-Link and the WLAN (in Status - Wireless it says it's still connected to the network), but when I want to access a web page (which only works if I'm connected to the wireless network from bldg A), my Firefox keeps "Looking for" (name resolution) without finding anything. When I reset the D-Link (power off, power on) in this situation, after some moments, everything's working fine again (Internet access). I've no idea why this is happening, but usually it's at most every few weeks (most times when nobody was using the computer, so no traffic). Compared to the connection speed when I connect directly to the WLAN in bldg A (Laptop), the speed in bldg B is rather slow, but I have the impression that this difference is worse in the last few days. A few minutes ago, I got 582 KB/s down and 911 KB/s up in bldg A (directly/laptop) and 84 KB/s down and 9 KB/s up in bldg B. The speed in bldg B used to be way higher (I remember 200 KB/s up) while the actual network speed in bldg A was lower than it is now (close to those 200). I'm aware that the wireless connection between those buildings should slow things down, but I'm wondering why this difference has become that extreme. Thanks for any tips... Update: I currently want to upload a large file (1.5 GB) via FTP (FileZilla). Since that caused the D-Link to disconnect (as described in first post), I took my laptop to bldg A, connected directly to the original WLAN (bypassing my D-Link) and tried the same upload. Guess what - same issue: At some point the connection is dead (at this point I would have reset my D-Link if I was connected to it). Just as the D-Link, my laptop is still connected, but not even name resolution is working ("Looking for..." in Firefox). After reconnecting, it's working again. Maybe my D-Link isn't the problem at all...

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  • Selective patching

    - by Franz
    Hi, I have a folder and a patch for that folder. Now, I do not want to include every change made in the patch in my commit. I can select which files I want to exclude in Subclipse, but can I do the same with only certain lines in those files?

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  • How to Block a HTTP Website along with Its All Subdomain using IPTABLE

    - by netnovice
    I run a small HTTP web proxy site . We can not modify anything there in Proxy program. Few users mainly use Yahoo Web mail for Spamming and We need to block yahoo web mail access only ( complete yahoo website is also Ok) through our proxy . specially .mail.yahoo.com.. Like - we need to block URL like - http://uk-mg61.mail.yahoo.com http://in-mg61.mail.yahoo.com etc. etc. Note : We generaly open http://mail.yahoo.com in browser - but after loggin in it forwards it to Urls like above but all those are subdomain of mail.yahoo.com My target is if we can get all IP list for all available subdomain of mail.yahoo.com I can block it totally . We can only use IPTABLE ...I know using proxy itself we can check HTTP header and check Host field for .mail.yahoo.com. and block it. Solution : Follwoign what I did using IPtable . I collected IP CIDR block for yahoo mainly for yahoo web mail ( mail.yahoo.com ) as much as possible ( using linux host and whois command ) [ like 66.163.160.0/19 nd 98.136.0.0/14 etc ] and applied follwing command Like iptables -A OUTPUT -p tcp -d 66.163.160.0/19 -m state --state NEW -j DROP etc. Things are working fine. user can not access yahoo mail BUT the problem is I need to be updated with the avaialble CIDR YAHOO IP list ... I am ready to do it every week. I collected many from Net... You know theer are countles subdomain of mail.yahoo.com and seems every week Yahoo adding new IP... But what I observed some time user can bypass our rule and the reason obvously all the avaialble Ips are not entered in IPtable yet. What we need to do is enter all Ips of mail.yahoo.co But where do I find all subdomain for mail.yahoo.com I know we can get it from DNS but I must not be allowed to make DNS axfr query. Also doing reverse DNS will have performance issue. I want to know all subdomain of .mail.yahoo.c Can I get it from yahoo site. I have the list of all YAHOO smtp IP....but I need webmail Ip... ( http://public.yahoo.com/carloc/ymail.html ) Can you please share your Idea. Thank you

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  • Why are there hard faults when my RAM is not 100% used?

    - by Vilx-
    I've got 2GB of RAM and the resource monitor shows that it's only used about 75%. However there are some apps (NetBeans, Visual Studio) that every once in a while start making a lot of hard faults (up to and over 2000/min), thus predictably slowing down to a crawl. How is this so? The memory usage during these "fits" doesn't change. Perhaps it also includes memory mapped files or something?

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  • How long do Lithium Ion batteries normally last?

    - by Zifre
    On the laptop I have, I've had to buy a new Li-Ion batter roughly every year. I do use this computer quite a lot, but I'm wondering if this is normal. Right now, my battery is completely dead (it lasts for about 0.1 seconds), so I plan on buying a new one soon. Is there anything you can do to prevent Li-Ion batteries from going dead so quickly?

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  • backup of KVM VM's running on Ubuntu 12.4.1 precise edition from a remote machine

    - by Dr. Death
    I am creating a library API which will take the backup of all the VM's running on KVM hypervisor. My VM's can be of any type. I am taking this backup from a remote machine and need to put the backup at remote server. I have KVM, Libvirt installed on my system. Some of my VM's are LVM based and some are normal VM's running on KVM. I research and found out an excellent perl script for taking the backup http://pof.eslack.org/2010/12/23/best-solution-to-fully-backup-kvm-virtual-machines/ but since I am developing this library in C++ I cannot use it however it has given me a good understanding of how it will work. One thing I didnot able to sort out is if my VM's are not created using virt-manager or are created using any other tool them virsh system list command does not give them in the list of running VM's however they are running perfectly on my KVM server. Is there a way to list these VM's in my system list anyhow? secondly, when I am taking backup from the remote machine I am getting out of my ssh mode as soon as my libvirt command finishes and for every command I need to ssh again, Is there a way that I do not need to ssh each and every time? I have already used the rsa key for ssh but when once my command finishes my control moves to the remote machine again and try to find out my source VM location in remote machine's local drives which in turn fails it. here is the main problem I am facing. also for the LVM based VM I am able to take the live backup but for non LVM based my machines are getting suspended and not been able to take the live backup. Since my library will work on the remote machine only I might not know the VM's configruation on the KVM server. so need to make it consistent for all the VM's. Please share any thing related to this issue so that I may be able to take the live backup of the non lvm vm's also. I'll update my working and any research findings time to time to all of you. Thanks in advance for your suggestions in these regards.

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  • Optical multicast

    - by Randomblue
    I have a 10G XPF+ optical cable with market updates from a stock exchange. This cable goes into a switch, which then multicasts every packet to a couple of computers. The problem with using a switch for multicast is that there is latency overhead, even with a pass-through switch (~200ns). Are there "optical" solutions (I'm thinking of a beam splitter of some sort) which would allow for close to zero latency 10G multicast?

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  • start-onlinecoexistencesync o365 Powershell

    - by Matt Bear
    I've been on the phone with microsoft for over an hour trying to get a straight answer from them, and if I was set up to test this myself right now I could find out. I'm deploying o365 SSO in stages by OU, dir sync is performed every 3 hours. I need to do a sync right away. Will 'start-onlinecoexistencesync' only sync those users that have already been federated, or will it force a federation of all users?

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  • What is Allow multicast from Broadband Network?

    - by PeanutsMonkey
    If a wireless modem router has the option Allow multicast from Broadband Network, what does this mean exactly? What risks are there to leaving it enabled and why would you have it enabled? I understand that a broadcast is sending a packet to every device on the network and a multicast is send a packet to a specified set of addresses. A multicast packet can cross routers whereas a broadcast cannot although I don't quite understand how these "set of addresses are specified"

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  • Bash: Read lines in a file scenario with sed or awk

    - by user105566
    I have this scenarios: File Content: 10.1.1.1 10.1.1.2 10.1.1.3 10.1.1.4 I want sed or awk so that when i cat the file every time new line is returned. like First iteration: cat ip | some magic 10.1.1.1 Second iteration returns 10.1.1.2 Third iteration returns 10.1.1.3 Fourth iteration returns 10.1.1.4 and after n number of iterations, it returns to line 1 Fifth iteration returns: 10.1.1.1 Can we do it using sed or awk.

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  • Disable Outlook 2003 splash screen when auto-starting

    - by serhio
    I want to hide the splash screen of Outlook 2003. I currently have it set to auto-start and hide to icon. Every time I start my computer I see the Outlook splash screen which makes me think that it's slowing down the OS to become "operational" after startup. What do I change in settings to not have the splash screen display on startup?

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  • Update password for scheduled task

    - by UserXIII
    I have a scheduled task that needs to run as a service account. The service account's password resets every 100 days, so I need to update the password for the scheduled task. I cannot figure out how to do this. When I select "Change User or Group" in the scheduled tasks' properties I get no prompt to update the password. This scheduled task will be deployed on Windows Server 2008 R2 and Windows 7.

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