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  • Mysql random rows

    - by n00b
    please read the whole question... 90% of you dont seem to do that and some of you only read the title obviously... and if you dont know the solution, dont answer - i wont have to downvote you -.-'' im entertaining the idea of getting random rows directly from mysql. what i found was SELECT * FROM tablename WHERE somefield='something' ORDER BY RAND() LIMIT 5 but even i see how slow that would be.. is the only way to do this doing something like SELECT * FROM tablename WHERE somefield='something' LIMIT RAND(aincrementvalue-5), 1 5 times? or is there a way that i with my little knowlege of databases cant come up with ? (no i dont want random indexes. i hate the idea of them...) @commenters - please first look, then think, then look again, think again and then post. i wont point fingers but i dislike stupid comments and why i think random indexes are a nasty hack ? it doesnt give you random results. it gives you x results from a random index in a predefined order its like a gapless id only in the wrong order if you fetch by 1 row and get true randomness you fall back to my method but with an additional junk field finally the reason the field exists is only to serve as a helper to something that can be done without it with almost same performance (but the quality (randomness) is better), so it is a nasty hack ;) i solved it, look @ my answer... if you think its incorrect please tell me :)

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  • Random record from MongoDB

    - by Will M
    I am looking to get a random record from a huge (100 million record) mongodb. What is the fastest and most efficient way to do so? The data is already there and there are no field in which I can generate a random number and obtain a random row. Any suggestions?

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  • Random number from a range in a Bash Script

    - by Jack
    Hi, I need to generate a random port number between 2000-65000 from a shell script. The problem is $RANDOM is only a 16bit number, so im stuck! PORT=$(($RANDOM%63000+2001)) would work nicely if it wasn't for the size limitation. Does anyone have an example of how I can do this, maybe by extracting something from /dev/urandom and getting it within a range? Thanks.

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  • Random timeouts in IIS7

    - by Cor-Paul
    Hi, I have a weird problem which I think is caused by my IIS7 installation on Vista 64 bit. I have a bunch of AJAX calls and JS dynamic file loads (~30) in a local application, and I get random timeouts (or so it seems) in my browser. In Chrome it looks like the page just stops loading (no HDD activity), in Firefox/Firebug I can see that some of the files are being loaded but they never actually finish. When I reload the page the same occurs, but for (random) other files that must be loaded. When I try to load one of those JS files concurrently (so during the timeout in FF) in another browser, the file loads there. So I am pretty sure the request can be handled by IIS. I am thinking about a limit or so on simultaneous requests from the same browser which is not working correctly, but I am pretty clueless on how to solve this. Does anyone recognize this problem and know a solution? Thanks!

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  • Windows freezes, showing a random color or pattern

    - by Manu
    I have a PC with windows 7, and I'm experiencing random freezes with increasing frequency. After some time (from 30 minutes to a few hours) the screen will shows a random color or pattern (vertical lines) and nothing works anymore, I need to reboot manually. I've checked the events log, but nothing is shown except for the unexpected reboot. I've tested the RAM with Memtest86+ 4.20, and the graphics card with FurMark 1.10.3, no errors have been found. I've updated the graphic drivers and openned the case to remove dust, but the issue is still there. Also, the problem doesn't seem to arise when I'm playing games fullscreen, but when I'm surfing the web, using itunes, or coding. My hardware is as follows : intel core i5 750 CPU, ATI Radeon HD 5670 graphics card, ASUSTeK P7P55D motherboard, two 2Gb KINGSTON DDR3 ram sticks, 2 SATA hard drives, a Netgear dongle for wifi.

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  • Can't make an array in C#

    - by Josh
    I'm trying to make a dynamic array in C# but I get an annoying error message. Here's my code: private void Form1_Load(object sender, EventArgs e) { int[] dataArray; Random random = new Random(); for (int i = 0; i < random.Next(1, 10); i++) { dataArray[i] = random.Next(1, 1000); } } And the error: Use of unassigned local variable 'dataArray' This is just baffling my mind. I came from VB, so please me gentle, lol. Cheers.

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  • 48-bit bitwise operations in Javascript?

    - by randomhelp
    I've been given the task of porting Java's Java.util.Random() to JavaScript, and I've run across a huge performance hit/inaccuracy using bitwise operators in Javascript on sufficiently large numbers. Some cursory research states that "bitwise operators in JavaScript are inherently slow," because internally it appears that JavaScript will cast all of its double values into signed 32-bit integers to do the bitwise operations (see https://developer.mozilla.org/En/Core_JavaScript_1.5_Reference/Operators/Bitwise_Operators for more on this.) Because of this, I can't do a direct port of the Java random number generator, and I need to get the same numeric results as Java.util.Random(). Writing something like this.next = function(bits) { if (!bits) { bits = 48; } this.seed = (this.seed * 25214903917 + 11) & ((1 << 48) - 1); return this.seed >>> (48 - bits); }; (which is an almost-direct port of the Java.util.Random()) code won't work properly, since Javascript can't do bitwise operations on an integer that size.) I've figured out that I can just make a seedable random number generator in 32-bit space using the Lehmer algorithm, but the trick is that I need to get the same values as I would with Java.util.Random(). What should I do to make a faster, functional port?

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  • IIS serving static content gives 503 at random

    - by Steffen
    We're having a few issues with our image server. It's a Win 2008 running IIS 7.5 and it only serves static content: images. It has run without issues for quite a while, until recently when we disabled Output Caching, as we noticed having it enabled meant it sent no-cache host-headers to the clients (forcing them to fetch the images from the server every time) We've read quite a bit about it, and it seems IIS just works that way - either you use Output Caching or you get to use cache host-headers. Anyway having disabled the Output Cache, we now experience random 5 minutes intervals, where all requests just get a 503 Service Unavailable. During this period the "Files cached" performance counter staggers (neither increased nor decreased) and after the period all caches are flushed. You might find it weird I talk about caching, since we disabled Output Caching. The thing is we changed the ObjectTTL parameter in registry, so we cache files for 3 minutes (which has worked very well, our Disk I/O dropped significantly) So even with Output Caching disabled, we're still caching plenty of files - if we could just get rid of the random 503 it'd be perfect :-D We don't get any messages in the Windows event log during these 503 intervals, so we're pretty stumped as to what to do. Any ideas are very welcome :-)

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  • Random Sampling in Excel

    - by bonsvr
    I have an Excel sheet as follows: NO NAME AMOUNT 1 A 50 1 B 50 2 A 100 2 C 100 3 D 70 3 B 70 4 A 30 4 F 30 5 C 150 5 G 150 . . . . There are let's say 10,000 rows. I want to get a random sample from rows. There are 2 conditions: 1. Sampling must be based on "NO" column. 2. Size of the sample is determined by the user: it can be %5, %10 or %20. For example, one decides to randomly choose %20 of total rows in the above example: The result is like: NO NAME AMOUNT 2 A 100 2 C 100 90 Z 500 90 E 500 . . . . There should be 2,000 rows. I don't know whether my question is too specific. I am new to Excel VBA, and I faced a situation like this. Above process is about getting a random sample from an account ledger for auditing purposes.

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  • Getting 0xc00000e windows 7 "Boot device inaccessible" after random crashes

    - by Dynde
    I've been having some weird random crashes that I can't seem to locate, and I'm unsure if it's windows or hardware related. It's a brand new computer and very powerful. I've run into a couple of these random crashes, now I don't know what causes them, as it happens during the night, when I'm sleeping. When I wake up, all I see is a boot manager screen that says Exception: 0xc00000e "Boot device inaccessible". A simple restart doesn't fix the problem - it seems to struggle locating my primary hdd - but a complete shutdown works, it'll just fly straight into windows again. The event viewer doesn't tell me much. The most reason incident just gives me this: "The previous system shutdown at 08:55:44 on ?11-?12-?2011 was unexpected." And also a kernel power event: The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly. and I can see only two application event entries around that time at 8.47 (about 8 minutes prior to the crash): The Windows Modules Installer service entered the running state. The WinHTTP Web Proxy Auto-Discovery Service service entered the running state. Can anyone tell me anything about this, or direct me to a forum or something that might know what's wrong? I can supply the extra details of the events too if needed. The hdd is an SSD - could that have anything to do with it? I ran a few diagnostics and memory and hdd should be okay - at least the diagnostics report is clean. Is it a faulty drive?

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  • Random "not accessible" "you might not have permission to use this network resource"

    - by Jim Fred
    A couple of computers, both Win7-64 can connect to shares on a NAS server, at least most of the time. At random intervals, these Win7-64 computers cannot access some shares but can access others on the same NAS. When access is denied, a dialog box appears saying "\\myServer\MyShare02 not accessible...you might not have permission to use this network resource..." Other shares, say \\myServer\MyShare01, ARE accessible from the affected computers and yet other computers CAN access the affected shares. Reboots of the affected computers seem to allow the affected computer to connect to the affected shares - but then, getting a cup of coffee seems to help too. When the problem appears, the network seems to be ok e.g. the affected computers can access other shares on the affected server and can ping etc. Also Other computers can access the affected shares. The NAS server is a NetGear ReadyNas Pro. The problem might be on the NAS side such as a resource limitation but since only 2 Win7-64 PCs seem to be affected the most, the problem could be on the PC side - I'm not sure yet. I of course searched for solutions and found several tips addressing initial connection problems (use correct workgroup name, use IP address instead of server name, remove security restrictions etc) but none of those remedies address the random nature of this problem.

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  • PuTTY inserts random characters during a session

    - by Zachary Polikarpus
    I recently started renting space on a remote server so that I could work on a project. I found that a relatively painless way to access it on a windows machine is through PuTTY. However, there is one thing that has always irked me when using it: for seemingly no reason random characters are sometimes inserted at the cursor. Most of the time it is just a single tilde, but rarely it spits out what looks like some escape sequence ([[^8 or the like). It will only occur when I am focused on the window, whether I am typing or 20 feet away from the keyboard. If left for long enough, it will spit tildes at random intervals (average is about 1 minute). Finally, this behavior seems to be inconsistant when running programs such as nano or the mysql interface: in nano, instead of inserting tildes, it will set marks (ctrl-^); in mysql, lines will become un-editable. My question is this: Has anyone else experienced this sort of behavior in PuTTY? And if so, what can be done to prevent/correct this behavior?

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  • Diagnosing Random Network Lag

    - by uesp
    I'm having trouble diagnosing some random lag on a 6 server LAMP cluster serving a MediaWiki site. While we're serving some 100 pages/sec the servers themselves are running fine with less than 0.5 load, no locked processes, no paging, no errors being logged, etc.... Lag is present on all servers and is random: one minute its fine the next it's there. DNS lookups on the servers are randomly slow. For example time nslookup google.com varies randomly from a few milliseconds to several seconds and sometimes times out entirely. While we use IP addresses internally on the cluster this may be a symptom of the root issue. We are not running our own DNS server. The Apache server-status pages randomly lag or time out. Benchmarking using ab between servers shows a few loads sometimes take 3000 ms (almost exactly). Benchmarking server-status on the local server itself usually shows no issue (it showed a lag only once among a few hundred tests). The servers are sitting behind a switch and a firewall which I don't have any access to so I don't know their setup or status. While we are under heavier than normal load a 2 Mbps incoming and 20 Mbps outgoing traffic shouldn't be stressing the switch or firewall should it? My feeling is that it is the switch/firewall or something above them in the ISP like their DNS but can't confirm it. I need some other tests or methods of diagnosing this lag to try and narrow down the ultimate cause.

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  • Why am I experiencing random connection timeouts? (CentOS)

    - by Ryan
    I have a CentOS server setup that currently hosts several websites (all relative of each other in some form or another). As of recently throughout the day at the most random times the website speed will lag to a crawl and eventually hit a connection timeout. When I say random times this typically happens anywhere between 10am and 1pm usually, however, this morning this happened to me at 8am. I do not have a lot of familiarity with server knowledge as far as what I am looking for in this situation. What are some possible causes of why my server is slowing the websites down to a complete crawl or timing out? Are there specific things I should be checking for when this happens? I have noticed using: tail /var/log/httpd/access_log That usually when this down time occurs there are lot of IP addresses related to BingBot, Googlebot, and sometimes various bots or spiders that I am unfamiliar with. Could this be related and if so how can I avoid this from causing my websites to lag out? Thanks in advance for any help or advice. The websites that are timing out are built with PHP and use a MySQL database to display information.

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  • Windows Server 2008 IIS Random disconnect

    - by d123
    I am having a bit of a quirk with my IIS server. I'm running my IIS with 2 sets of IPs configured, one in the 192 range and the other in 172 range. I then have multiple apps which will talk to this server for information. Server has no AV or firewalls configured. I noticed that my apps when talking to the server on the 172 range, at random intervals, the server would just not respond. My apps would then disconnect and just try again, and every thing would be fine. This doesn't happen on the 192 range. So what I did is on a Linux box I did a watch command and to wget a file every half second on the 172 and 192 IPs. I noticed the same issue, every once in awhile wget on the 172 range would not get through, but there is no issues at all on 192. Thus I went around to Wireshark and did a dump. This is the last 3 packets, no other packets were received. 7010 100.871877 200.100.30.7 172.0.0.1 TCP 59619 http [ACK] Seq=140 Ack=85242 Win=64128 Len=0 TSV=1072818795 TSER=1660246133 7011 100.872238 200.100.30.7 172.0.0.1 TCP 59619 http [FIN, ACK] Seq=140 Ack=85242 Win=64128 Len=0 TSV=1072818796 TSER=1660246133 7013 100.873081 200.100.30.7 172.0.0.1 TCP 59619 http [ACK] Seq=141 Ack=85243 Win=64128 Len=0 TSV=1072818796 TSER=1660246133 So this is my issue, there is a random disconnect every once in awhile. The server doesn't receive the next SYN packet. HELP?

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  • Chuck Jones Shows How to Draw Bugs Bunny [Video]

    - by Asian Angel
    Is drawing one of your passions and/or hobbies? Are you a fan of the classic Bugs Bunny cartoons? Then you will certainly enjoy this delightful video where Chuck Jones shows you how to draw Bugs Bunny! Chuck Jones shows how to draw Bugs Bunny [via Neatorama] How to Make Your Laptop Choose a Wired Connection Instead of Wireless HTG Explains: What Is Two-Factor Authentication and Should I Be Using It? HTG Explains: What Is Windows RT and What Does It Mean To Me?

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  • Streaming Netflix Media with My Wii

    - by Ben Griswold
    Late last year, I wrote about Streaming Media with my Sony Blu-ray Disc Player. I am still digging the Blu-ray player setup but guess what showed up in the mail yesterday?   That’s right!  A free Netflix disc which now let’s me instantly watch TV episodes and movies via my Wii console.  I popped the disc into the console and in less than 2 minutes the brain-numbingly simple activation was complete.  (Full-disclosure: I already had my Wi-Fi connection configured, but I’m confident that the Netflix installation disc would have helpfully walked me through this additional step if need be.) As it turns out, the Wii Netflix UI offers far more options than what one gets with the Blu-ray setup.  Not only can I view my Instant Queue, but there’s a list of recently watched movies, a list of recommended titles by category, the star rating system, movies information and nearly everything you find on the web.  I reread Steve Krug’s Don’t Make Me Think: A Common Sense Approach to Web Usability on a flight back from Orlando on Wednesday, so my current view of the world may be a little skewed but, the brilliance of Netflix Wii’s user interface is undeniable. It’s not like the Blu-ray navigation is complicated but the Wii navigation feels familiar and intuitive. How intuitive?  Well, you won’t find a single bit of help text on any of the Wii screens – just a simple and obvious point-and-click navigation system.  And the UI is really pretty (which is still very important if you ask me) and so easy it became fun. Did I mention the media streaming works!  Yep, we watched 2 half-hour kid videos yesterday without any streaming issues at all.  If you have a Netflix account and a Wii, order your disc and give it a go. It’s good stuff.

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  • Tech Germs – Tis the Season [Infographic]

    - by Asian Angel
    Think the tech and household items you work with or use on a daily basis are clean? Then think again. View a Larger Version of the Infographic Tech Germs [infographic] – Blog Post [via Elinor Mills] How to See What Web Sites Your Computer is Secretly Connecting To HTG Explains: When Do You Need to Update Your Drivers? How to Make the Kindle Fire Silk Browser *Actually* Fast!

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  • Outlook 2010 – My Top 9 features

    - by Daniel Moth
    Office 2010 has reached RTM. Here are my favorite Outlook features. Speed. It is faster than previous versions and hangs much less… Ignore Conversation (Ctrl+Del). Not interested in a conversation? Click this button on the new ribbon and you'll never receive another message on that thread (they all go to your Deleted folder). Calendar Preview. When receiving a Meeting Request, before deciding to accept or not you get to see a preview of your calendar for that day and where the new meeting would fit in. See full description on outlook team blog post. Quick Steps. See full description on outlook team blog post. I have created my own quick steps for filing conversations to folders, various pre-populated reply templates, creating calendar invites and creating TODOs from received emails. Search Interface. Many of us knew the magic keywords for making smart searches (e.g. from:Name), but it is great to learn many more through the search tools contextual ribbon tab. Next 7 days. Out of the many enhancements to the Calendar view, my favorite is to be able with  single click to view the next 7 days – that is now my default view. MailTips. See full description on outlook team blog post. The ones I particularly like are when composing a mail to someone that has their Out Of Office reply set, you get to read it before sending the mail (and hence can decide to postpone sending). when composing a mail to a distribution list, a message informs you of the number of recipients. Hopefully, senders will use that as a clue for narrowing down the recipient list or at least verifying that their mail should indeed be sent to so many people. "You are not responding to the latest message in this conversation. Click here to open it.". When composing a reply to a conversation and you have not picked the last message to reply to (don't you hate it when people split threads like that?), this is the inline message you see (under the MailTips area) and if you click on the message it opens the last mail in the conversation so you can reply to that. Rich "Conversation Settings" and in particular "Show Messages from Other Folders". For example, you can see in your inbox not only the message you received but also the reply you sent (it gets pulled in from the Sent folder). Another example: a conversation has been taking place on a distribution list (so your rules filed it to a folder) and they add you on the TO or CC line, so it appears in a different folder; regardless of which folder you open, you are able to see the entire conversation. Note that messages from other folders than the one you are browsing, appear in grey text so you can easily spot them. Reading them in one folder, obviously marks them as read in the other folder… If you haven't yet, when are you making the move to Outlook 2010? Comments about this post welcome at the original blog.

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  • Explore Six of the Ocean’s Incredible Coral Reefs with Google Maps

    - by Asian Angel
    Are you ready to view some gorgeous underwater photography and explore our ocean’s coral reefs from the comfort of your desktop? Then you will definitely enjoy this wonderful collection of underwater ‘street view level’ coral reef images from Google Maps. Once you get started you can easily lose yourself in the tranquillity and beauty of these oceanic kingdoms. Here is a quick peek at the collection that is available for your viewing pleasure… 8 Deadly Commands You Should Never Run on Linux 14 Special Google Searches That Show Instant Answers How To Create a Customized Windows 7 Installation Disc With Integrated Updates

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