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  • What's the best way to store custom objects in relational database?

    - by user342610
    I have my objects with their properties. Objects could change their structure: properties may be added/removed/changed. Objects could be absolutely dropped. So object's metadata (description, classes, call them like you want :) )could be changed. The database should store objects schemas and instances of these objects. What's the best way to organise a relational database structure to store data mentioned above? Currently I see only two ways: 1) Store objects schemas in a few tables: schema general data,schema properties, possible properties types. Store instances in their tables: instance general data, a few tables - per each type from possible properties types table to store instance properties data. And so on. 2) store objects schemas like in p1 but store instances like XML files in one table: one table for general instance info and one table with instance XML. please, don't ask why/for what I need this. Just need to store custom objects and DB should work fast :)

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  • What is the most efficient way to store and access images

    - by MT
    I am working on a project which has to store tens and thousands of images on a server and let the users access them. I need the most efficient method to store these images and to retrieve them. Also, I need information about which technology I should opt. I haven't started the project yet. So, I am thinking between PHP w/ CodeIgniter and Ruby on Rails. PS: The site is something similar to Flickr except that the images are uploaded only by the Authors of the content, and not by the users.

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  • How to store and retrieve pictures using PHP?

    - by user1276898
    I am building a webpage using PHP to search within my database. I am able to do a query and get the data to show on my page. I also have a picture that is related to each record. Let's say something like a picture ID for each employee. I am wondering what is the best way to store and retrieve pictures in order to get it show using PHP. Is there a way to store all the pictures in the subfolder like " image" and retrieve the pictures using PHP? I tried to search around on the internet, but I get confused. Also, when I type something in the search box and click the button, is there a way to keep the input in the search box without erasing it? Thank you very much.

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  • Django store regular expression in DB which then gets evaluated on page

    - by John
    Hi, I want to store a number of url patterns in my django model which a user can provide parameters to which will create a url. For example I might store these 3 urls in my db where %s is the variable parameter provided by the user: www.thisissomewebsite.com?param=%s www.anotherurl/%s/ www.lastexample.co.uk?param1=%s&fixedparam=2 As you can see from these examples the parameter can appear anywhere in the string and not in a fixed position. I have 2 models, one holds the urls and one holds the variables: class URLPatterns(models.Model): pattern = models.CharField(max_length=255) class URLVariables(models.Model): pattern = models.ForeignKey(URLPatterns) param = models.CharField(max_length=255) What would be the best way to generate these urls by replacing the %s with the variable in the database. would it just be a simple replace on the string e.g: urlvariable = URLVariable.objects.get(pk=1) pattern = url.pattern url = pattern.replace("%s", urlvariable.param) or is there a better way? Thanks

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  • Store multiple XML files in Android

    - by Federico Perez
    I am developing a survey android app so that: Each survey is downloaded from server as XML file. A survey can have multiple versions (new survey, new XML). When a new XML is downloaded it should overwrite its corresponding previous XML. I would like to store the files in a sqlite database. How can I insert my files into the db? Should I use BLOB or store the content of the XML as string? In any case how should I do it?

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  • Calculating number of online visitors?

    - by Syom
    i need to show the number of online visitors, but there is a problem with selecting algoritm to do it! maybe i must create a table in DB, where i'll store ip addresses of visitors and time of visit! by so i can show the count of ip addresses, which's time = NOW() - 10 minutes, for example...("now()-10 minutes" is just to show the logic, i know that this is not a function:) is this goog way to go? or maybe it's better to use AJAX methods to store the data? please give me an idea. Thanks

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  • Free space not reclaimed after online resizing ext4 in Ubuntu 9.10

    - by TiansHUo
    My root partition was filling up, with only 500 mbs left, I wanted to resize my root partition from 20 Gb to 40Gb So I resized my partition by using these steps: Using Gparted to resize another partition to give space for the EXT4 Using fdisk, deleting the root partition (on /dev/sda2), and creating it again using the new size resize2fs /dev/sda2 Updating grub2 But now the problem is that although I can boot in my new partition and the new partition shows it is 40Gb, but the free size was still 500mb. So I booted from a LiveCD and checked with e2fsck -p /dev/sda2, it reported clean. So I added the -f flag (force check), still, the drive is full.

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  • KVM online disk resize?

    - by Eil
    We're evaluting KVM for Linux virtualization on a few projects. All is going well so far. But one of our requirements is the ability to add disk space to a running guest without rebooting or taking it offline. Is this possible with KVM? The only thing I've found so far (but have not tested yet) is the ability to hotplug disks into the machine. If I go this route, then I could always add the new disk to an LVM volume group on the guest and then extend the chosen logical volume. The biggest downside to this approach is that over time we might end up with guests having variable numbers of virtual disks. The "real" disk space would be provided to the host over a SAN, so we can always add more space to the host whenever.

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  • MySQL replication hung after slave goes offline and comes back online again

    - by Ed Manet
    I have a master server and several slave servers replicating a single database. I am using in MySQL 5.0 in SLES 11. During fault tolerance testing I found that when the slave's network connection is broken (cable un-plugged) and then restored, replication hangs. It shows no errors and the slave appears to be running but the Read_Master_Log_Pos and Exec_Master_Log_Pos values do not match the log postion on the master server. The Slave_IO_State is "Waiting for master to send event". The Slave_IO_Running and Slave_SQL_Running values are both are "Yes". The Master_Log_File and Relay_Master_Log_File match. If I stop and start the slave or restart the mysql daemon, replication starts working again. Any ideas on what I can do about this?

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  • Where does apache store initialization state for mod_proxy_balancer

    - by khoxsey
    I run apache2 on Ubuntu as a caching load-balancing reverse proxy in front of a group of application servers. I have noticed that the balancer maintains some state for some of the attributes visible in /balancer-manager such as whether an IP is enabled/disabled, load factor, etc. My site has periods of high (and low) usage, and recently as I added a new server to the working group I noticed that the load balancer picked up the new server but had it set to Disabled. I'm curious where that data is stored, and/or how it is initialized.

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  • Why can't I install apps on Windows 8 using specific dial-up modem connections?

    - by Vincent of Earth
    This problem has persisted since I first tried out Windows 8 Consumer Preview, and also affects Windows 8, Windows 8.1 Preview, and Windows 8.1. Specifically, the problem occurs when I try to install apps from the Windows Store on a Globe Tattoo Broadband or Smart Bro dial-up connection (two common ways of connecting to the internet in the Philippines). I can confirm that this isn't a problem with my copy of Windows or my Microsoft account because I was able to install any app on other connections like public WiFi. This problem has persisted on three different dongles and two different computers. So why can't I install apps on those two specific types of connections?

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  • Can't find created directory on zfs

    - by maniat1k
    I'm using openSUSE 13.1. I created a new directory on a zpool zfs create zpgd0/iSCSI -o compression=lz4 -o atime=off but I'm not looking on that... So I do it again but I'm getting... zfs create zpgd0/iSCSI -o compression=lz4 -o atime=off cannot create 'zpgd0/iSCSI': dataset already exists adding some data zpool history History for 'zpgd0': 2014-08-11.13:38:21 zpool create -f zpgd0 raidz2 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0490461 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0603473 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0606817 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0670246 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0673599 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0715212 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0722699 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0731193 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0732862 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0806663 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0807385 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0816943 2014-08-11.14:13:09 zpool set autoexpand=on zpgd0 2014-08-11.14:14:32 zfs create zpgd0/espacio 2014-08-19.11:47:47 zfs create zpgd0/iSCSI -o compression=lz4 -o atime=off zpool status -v pool: zpgd0 state: ONLINE scan: none requested config: NAME STATE READ WRITE CKSUM zpgd0 ONLINE 0 0 0 raidz2-0 ONLINE 0 0 0 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0490461 ONLINE 0 0 0 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0603473 ONLINE 0 0 0 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0606817 ONLINE 0 0 0 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0670246 ONLINE 0 0 0 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0673599 ONLINE 0 0 0 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0715212 ONLINE 0 0 0 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0722699 ONLINE 0 0 0 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0731193 ONLINE 0 0 0 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0732862 ONLINE 0 0 0 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0806663 ONLINE 0 0 0 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0807385 ONLINE 0 0 0 scsi-SATA_WDC_WD4001FAEX-0_WD-WMC1F0816943 ONLINE 0 0 0 errors: No known data errors I have no errors but the folder does not appear, so what Can I do? sorry add it zfs list NAME USED AVAIL REFER MOUNTPOINT zpgd0 933K 35,5T 54,7K /zpgd0 zpgd0/iSCSI 54,7K 35,5T 54,7K /zpgd0/iSCSI

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  • Installing/Uninstalling Windows 8 UI Apps in Windows 8 for all users

    - by Donotalo
    I'm using Windows 8 Pro 64 bit quite a while now. My account is the only Administrator account on the PC. There are 2 other standard (and local) accounts. I've noticed that if I install an app from Windows Store, that app is only available from my start screen. Also when I uninstall an app that's common for all users (e.g., Finance), it only uninstalled from my account. I want to install app and want it to be available for all users. When I'll uninstall an app, it should be removed for all users. No other user should have access to it. Just like installing/uninstalling programs on previous versions of Windows. How can I do that?

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  • Where does Picasa store albums?

    - by Dan
    For people searching, the question might also be phrased: How do I restore Picasa albums from backup? When I reinstalled my computer and restored my photos from backup, some of my albums showed up, but many didn't. I've found the following info: Picasa on Windows stores (stored?) album info in these places: Vista: C:\Users\<myaccount>\AppData\Local\Google\Picasa2Albums\ XP: C:\Documents and Settings\<myaccount>\Local Settings\Application Data\google\Picasa2Albums\ I restored that folder and was still missing many of my albums. That folder also contained a folder of backups, but the most recent one was from a long time ago and I've created albums since then. According to https://support.google.com/picasa/bin/picasa.google.com/support/bin/static.py?hl=en&page=release_notes.cs, since the Dec 8, 2011 build, Picasa saves album info in .ini file(s). This probably explains the albums that I do see. http://katelharrison.blogspot.com/2012/01/how-to-restore-picasa-albums-mac.html has some great info on restoring albums on Macs, but the folder structure seems to be different there than on Windows.

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  • Backing up an online database

    - by Veejay
    I havea 70MB db of my website which is hosted with a provider. I am able to access my db using SSMS 2008 remotely. On a running website, which is the best way I can back up the db locally on machine Thanks

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  • Online Source for Rackmount Server Shipping Box

    - by prs563
    Hi guys, I have three Dell rackmount servers (2 2U, 1 4U) that I need to ship from Las Vegas to New York. Old shipping boxes that came with the servers were discarded sometime ago. Where can I buy some that fit nicely and can be shipped by UPS or Fedex? I've tried UPS, Fedex, and Uhaul already. Thanks in advance.

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  • Utility to store/cache all web pages and YouTube videos

    - by jonathanconway
    I found myself in the following situation. I'm travelling abroad with my laptop. I connect to a WiFi point and do a bit of browsing and play a YouTube video or two. Then I disconnect and hop on either a plane or taxi. Now I want to go back to some of the webpages I was browsing before and continue reading them, or watch some more of that YouTube video. Unfortunately it seems like none of these resources are cached, or if they are, I have no idea how to access them. Here's what I'd like: A utility that starts when my computer boots and sits in the background, silently caching all the web pages that I view. Not only that, but also the resources such as YouTube videos. Later, when I re-navigate to a site while disconnected, the browser automatically pulls the pages from my cache rather than giving me a 404 error. Or I can click an icon in the system tray and see a list of all the pages/videos in the cache and view any that I like. I'm sure Internet Explorer had a feature like this at some point, like "Offline Mode" or something. But these days it doesn't seem to work. Even when I select that option I still can't view pages that I'm certain I downloaded before. So has the utility I'm talking about been developed yet?

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  • Will adding a SSD cache device to my ZFS storage improve performance?

    - by Sysadminicus
    The server has 4GB of RAM and my zpool is made up of 15.5k SAS drives arranged like this: NAME STATE READ WRITE CKSUM tank ONLINE 0 0 0 raidz1-0 ONLINE 0 0 0 c0t2d0 ONLINE 0 0 0 c0t3d0 ONLINE 0 0 0 c0t4d0 ONLINE 0 0 0 c0t5d0 ONLINE 0 0 0 c0t6d0 ONLINE 0 0 0 c0t7d0 ONLINE 0 0 0 c0t8d0 ONLINE 0 0 0 raidz1-1 ONLINE 0 0 0 c0t10d0 ONLINE 0 0 0 c0t11d0 ONLINE 0 0 0 c0t12d0 ONLINE 0 0 0 c0t13d0 ONLINE 0 0 0 c0t14d0 ONLINE 0 0 0 spares c0t9d0 AVAIL c0t1d0 AVAIL The primary use is as an NFS store for a couple VMWare ESXi servers. I can't do any "true" benchmarks because this is a production system (no budget for test systems), but using dd and bonnie++ I can't get more than ~40-50MB/s writes and ~70-90MB/s reads. It seems I should be able to do much better, but I'm not sure where to optimize. Based on what I've read, I think dropping in a OCZ Vertex 2 Pro SSD as my L2ARC is going to be the best bang-for-the-buck to improve througput. Is there something else I should be looking into to help performance? If not... How do I know how big a cache device I need? Am I safe with only a single SSD as my cache device?

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  • Online Backup strategy for family individuals

    - by marlon brando
    The majority of my family, including myself, uses Dropbox and Syncplicity free accounts for our syncing needs. However our backup strategy is pretty non-existent, we all have access (via webDav) to our qnap nas located at home, however we copy files accross when we can remember to do so, terrible I know. Is there tools like CrashPlan or Spideroak that allows each the accomodation of each family members syncing and back-up needs under one main account? I'm not sure how this would work, as each family member would need a seperate sub-account or would I manage each computer's syncing and backup lists from a single account? Any thoughts?

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