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  • Update multiple rows with known keys without inserting new rows if nonexistent keys are found

    - by Kirzilla
    Hello, Let's imagine that we have table items... table: items item_id INT PRIMARY AUTO_INCREMENT title VARCHAR(255) views INT Let's imagine that it is filled with something like (1, item-1, 10), (2, item-2, 10), (3, item-3, 15) I want to make multi update view for this items from data taken from this array [item_id] = [views] '1' => '50', '2' => '60', '3' => '70', '5' => '10' IMPORTANT! Please note that we have item_id=5 in array, but we don't have item_id=5 in database. I can use INSERT ... ON DUPLICATE KEY UPDATE, but this way image_id=5 will be inserted into talbe items. How to avoid inserting new key? I just want item_id=5 be skipped because it is not in table. Of course, before execution I can select existing keys from items table; then compare with keys in array; delete nonexistent keys and perform INSERT ... ON DUPLICATE KEY UPDATE. But maybe there is some more elegant solutions? Thank you.

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  • PostgreSQL, Foreign Keys, Insert speed & Django

    - by Miles
    A few days ago, I ran into an unexpected performance problem with a pretty standard Django setup. For an upcoming feature, we have to regenerate a table hourly, containing about 100k rows of data, 9M on the disk, 10M indexes according to pgAdmin. The problem is that inserting them by whatever method literally takes ages, up to 3 minutes of 100% disk busy time. That's not something you want on a production site. It doesn't matter if the inserts were in a transaction, issued via plain insert, multi-row insert, COPY FROM or even INSERT INTO t1 SELECT * FROM t2. After noticing this isn't Django's fault, I followed a trial and error route, and hey, the problem disappeared after dropping all foreign keys! Instead of 3 minutes, the INSERT INTO SELECT FROM took less than a second to execute, which isn't too surprising for a table <= 20M on the disk. What is weird is that PostgreSQL manages to slow down inserts by 180x just by using 3 foreign keys. Oh, disk activity was pure writing, as everything is cached in RAM; only writes go to the disks. It looks like PostgreSQL is working very hard to touch every row in the referred tables, as 3MB/sec * 180s is way more data than the 20MB this new table takes on disk. No WAL for the 180s case, I was testing in psql directly, in Django, add ~50% overhead for WAL logging. Tried @commit_on_success, same slowness, I had even implemented multi row insert and COPY FROM with psycopg2. That's another weird thing, how can 10M worth of inserts generate 10x 16M log segments? Table layout: id serial primary, a bunch of int32, 3 foreign keys to small table, 198 rows, 16k on disk large table, 1.2M rows, 59 data + 89 index MB on disk large table, 2.2M rows, 198 + 210MB So, am I doomed to either drop the foreign keys manually or use the table in a very un-Django way by defining saving bla_id x3 and skip using models.ForeignKey? I'd love to hear about some magical antidote / pg setting to fix this.

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  • Joining Tables Based on Foreign Keys

    - by maestrojed
    I have a table that has a lot of fields that are foreign keys referencing a related table. I am writing a script in PHP that will do the db queries. When I query this table for its data I need to know the values associated with these keys not the key. How do most people go about this? A 101 way to do this would be to query this table for its data including the foreign keys and then query the related tables to get each key's value. This could be a lot of queries (~10). Question 1: I think I could write 1 query with a bunch of joins. Would that be better? This approach also requires the querying script to know which table fields are foreign keys. Since I have many tables like this but all with different fields, this means writing nice generic functions is hard. MySQL InnoDB tables allow for foreign constraints. I know the database has these set up correctly. Question 2: What about the idea of querying the table and identifying what the constraints are and then matching them up using whatever process I decide on from Question 1. I like this idea but never see it being used in code. Makes me think its not a good idea for some reason. I would use something like SHOW CREATE TABLE tbl_name; to find what constraints/relationships exist for that table. Thank you for any suggestions or advice.

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  • WPF MediaElement pauses when trying to play Windows Media Center recording

    - by eborlas
    I have an WPF application that starts a live tv recording using Windows Media Center, using the Windows Media Center SDK, waits 2 minutes and then plays the currently recording file (.wtv) in a WPF MediaElement. The problem is that the video visual will freeze and it is not consistent on when it happens. I have looked into it and discovered that the timeline is still moving so the MediaElement still thinks that the video is playing. This happens only when trying to play a video file that is currently being recorded, previously recorded shows play just fine. Both Media Center and Media Player can play those files without any hiccups; it is only the WPF MediaElement that has this problem. Any help would be appreciated.

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  • Windows Media Center, setting referer header

    - by Sha Le
    Hi I asked this question in SuperUser, posting here as well (http://superuser.com/questions/225671/windows-media-center-setting-referer-header). Is there a way to add REFERER header for any RTSP streams within Windows Media Center, I learned that REFERER header is only added when Windows Media Player is in a embed state. But I want to know that's true and also is there any plugin/addon. Thanks in advance.

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  • How to create custom media type in WordPress?

    - by OJ2
    I have some custom media (special map points for example) I want to associate custom data player with it and place its instances in media library (so them to be accessible in media gallery), keeping possibility to edit it any time user wants to. how to do it? Sorry for my Eng.Lang feel free to edit this Question.

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  • Is the location of SSH keys on Windows fixed?

    - by user16654
    I read an article: Determine whether you've already generated SSH keys which says that ssh in Windows, keys are in C:\Documents and Settings\userName\Application Data\SSH\UserKeys\ but I have found the keys to be in C:\Documents and Settings\userName\Application Data.SSH . Is there a setting to determine where to put these keys or am I reading the wrong documentation or what?

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  • Create automatically table that is composed by its primery key and 2 other foreign keys

    - by user210481
    I have table A with a primary id, a table B with a primary key id also and another table C with a primary key id and rows Aid and Bid where Aid and Bid are foreign keys of C and the primary keys of A and B respectively. One way of populating these DB would be populating table A, table B and table C separately. I would like to know if there is a more clever way of doing it, where I could populate A first and at the same time I populate B, I can indicate that an entry in C should be also created. Any idea and suggestion on how to populate them is welcome. I'm trying to take advantage of the foreign keys structure Thanks

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  • Working with foreign keys - cannot insert

    - by Industrial
    Hi everyone! Doing my first tryouts with foreign keys in a mySQL database and are trying to do a insert, that fails for this reason: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails Does this mean that foreign keys restrict INSERTS as well as DELETES and/or UPDATES on each table that is enforced with foreign keys relations? Thanks! Updated description: Products ---------------------------- id | type ---------------------------- 0 | 0 1 | 3 ProductsToCategories ---------------------------- productid | categoryid ---------------------------- 0 | 0 1 | 1 Product table has following structure CREATE TABLE IF NOT EXISTS `alpha`.`products` ( `id` MEDIUMINT UNSIGNED NOT NULL AUTO_INCREMENT , `type` TINYINT(2) UNSIGNED NOT NULL DEFAULT 0 , PRIMARY KEY (`id`) , CONSTRAINT `prodsku` FOREIGN KEY (`id` ) REFERENCES `alpha`.`productsToSku` (`product` ) ON DELETE CASCADE, ON UPDATE CASCADE) ENGINE = InnoDB;

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  • Cheap dvr media server

    - by Tester101
    I would like to build a new computer to be used as a DVR and media server. I am thinking of using mythtv as the DVR software, but short of that decision I am completely open to suggestions. Requirements: Must be cheap. Must have low power consumption (since it will always be on). Should be quiet. Should be small. I'm really not sure where to start with this project, and am open to any hardware/software suggestions. Is it possible to build a small quiet and cheap system? *Keep in mind I am working on this project because I am tired of Cable rate increases, but I can't imagine living without a DVR so cost is very important and I would like the system to be sub $200.00. The system also needs to handle the new digital broadcast system. Thanks for the help,

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  • Changing Windows Media Center StartRecording Task Scheduler options

    - by T Reddy
    Hi, I'm experiencing some occasional crashes waking from sleep and I believe it may be related to the Corsair SSD F40GB2 as my boot disk...or the new Ceton tuner I recently installed... I dunno what the real problem is as I can't reproduce the problem manually. I read somewhere that I should not allow the hard disks to sleep...so I'm trying that in the meantime... At any rate, I don't really care that the computer crashes so long as WMC will start recording the task as soon as possible...the task is scheduled to wake the computer 5 minutes before the recording starts. I noticed that there is a StartRecording param in the Media Center folder in Task Scheduler. There is an option (currently unchecked) that will retry a failed task. I would like to know if there is a way to enable that checkbox. My hope is that if my PC crashes when waking up for this task, that after it reboots the task will trigger again and start recording. Thanks!

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  • Windows Media Center says "Searching for tuners" when I try to play live TV

    - by Louis
    After upgrading from Windows 8 Pro with Media Center to the 8.1 preview, I need some help in being able to watch live TV again. When I try to now, it says Please Wait. Searching for tuners. I tried reinstalling the software for the Hauppauge WinTV DCR-2650 TV tuner, and upgrading the firmware for both the tuner and the Cisco STA-1520 tuning adapter. I also tried swapping around the USB ports, cold-booting the devices, and running the Set Up TV Signal setting in WMC, but that says The TV signal cannot be configured because a TV tuner was not detected. Both devices look fine in Device Manager, reporting the "This device is working properly" status. I'm not sure if this is related, but I did have some network connectivity issues immediately after upgrading to Windows 8.1 where my either my subnet mask or default gateway was missing, and since the TV tuner shows up as a network device, I wonder if that might be related. However, I really don't know how those settings should look and Hyper-V sort of further complicates things with the virtual Ethernet adapters:

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  • What is a usable throughput for a home media server

    - by Craig
    I am looking to setup a home server that will act as a media server. This will include both video (possibly HD) and audio. The clients will be a fun mix of hardware but that is a different question. What I want to know is what is the minimum throughput for streaming video without hitches? Is there a "sweet" spot for throughput (price vs. throughput)? I am determining my budget for this "upgrade" and I need to evaluate wether or not upgrading to a 1 Gbps home LAN is required. Sure, it would be sweet and easily handle the traffic but I don't want to do it unless it is necesary.

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  • Windows 8 Media Center Pack Install Fails with DoTransmogrify failed due to error 0x80070011

    - by Conrad Frix
    When I attempt to use Add Features to install the Windows 8 Media Center pack I get the "Something Went Wrong" Message Checking %localappdata%\Microsoft\Windows\Windows Anytime Upgrade\Upgrade.log I can see the following error block 2012-10-27 18:43:13, Error WAU DoTransmogrify failed due to error 0x80070011. 2012-10-27 18:43:13, Error WAU UpgradeSKU failed. Exiting. 2012-10-27 18:43:13, Error WAU The worker process exited unexpectedly 2012-10-27 18:43:13, Error WAU Something went wrong 2012-10-27 18:43:13, Error WAU Close this wizard and try again. My understanding is that 0x80070011 means Error_Not_Same_Device. I think this may be related to the fact that C:\Users is a junction point to D:\Users Do I have to move my users directory back? Is there a workaround?

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  • Getting triple-tap for Gyration Media Center remote working in Windows shell

    - by Lunatik
    I have this Gyration remote which, out of the box, does not support triple-tap for text entry outside of Media Center; only numbers can be entered in the Windows shell. Gyration have a patch that supposedly allows this, but it hasn't worked for me. I'm not alone in this regard it seems though. I've seem some discussion on removing and reinstalling USB devices to get this working, but nothing I'd really trust not to screw something else up. Does anyone have any tips for getting this functionality working properly?

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  • Using a sky card in Media Center

    - by Jonathan
    I'm not 100% is this SU suitable but oh well. I'm wondering if it's possible to get a slot of some kind to put my Sky Card into a Media Center PC and then be able to have a triple or dual tuner, and connect to the satelitte dish, allowing me to record 3 and watch a previously recorded. Also it would mean access to Youtube and things easily, with only one box. Also would this be legal or is it similar to Apple where you can only use Mac OSX on boxes with the Apple Logo on?

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  • Inconsistent black levels in windows 7 media center

    - by James G
    I've got a HTPC running windows 7 64bit, hooked up to a Samsung LCD TV. My problem is different types of video are displaying different black levels on the TV. When I play a bluray through Arcsoft Total Media Theater I have to set the "HDMI Black Level" to "normal" in the TV picture options menu. When I play recorded TV through WMC I have to set it to "low" otherwise the black colors on the video are washed out and grey. Is there any way to configure the system so all videos are displayed with the same black level? The hdmi black level setting is deep in Samsung's menus so it's becoming a chore to keep switching it everytime I watch a different type of video. I'm using an ATI 4670 graphics card with HDMI output going straight to the TV. In the ATI catalyst control center I've got pixel format set to RGB 4:4:4 (Full RGB) since the TV wont allow me to change the HDMI black level if I choose one of the other settings.

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  • VLC Media Server

    - by Josh
    We are using VLC on ubuntu, and trying to set up a streaming media server. We have the http interface working fine from remote computers, and we can also see the video playing as text if we don't screen VLC. Our problem is the output streaming. When we use the main VLC page you get when you goto the servers IP it does not save the output MRL (refreshing page it will go away, even after clicking save.) We tried to VLM page and it appears to work fine from the http page (it buffers, plays, timers go up when not paused, etc.) However, we still cannot connect remotely with a VLC client. The output parameters do save properly on the VLM page. We are noobs when it comes to this. Does anyone have a very to the point procedure of getting a file X to play and stream on ubuntu using VLC assuming VLC is installed?

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  • Windows 8.1 won't accept my Media Center Pack Product Key

    - by Daniel
    I just installed Windows 8.1 Pro as an upgrade from an ISO torrent. I was able to activate my original Windows 8 key successfully. However, I tried to activate my Media Center Pack key that I purchased for Windows 8 and it errors out the first try. When I try to activate it again, it then says "This key won't work. Check it and try again, or try a different key.". Do I have to purchase the key again? Thanks

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  • Microsoft Keyboard(8000) play button opens Windows Media Player rather than Zune on Windows 7

    - by Chance
    Im currently using the Microsoft 8000 keyboard on Windows 7 and before installing Microsoft's Keyboard application, it was opening Zune and playing music with the play button. After installation, it is now opening Windows Media Player rather than Zune. If I have Zune open and press play, it will open WMP and upon pressing it again, will kick off the play command in Zune. I've checked the default programs in the control panel and have set Zune as default for all available but that hasn't changed anything. Has anyone run into this before? I'm a bit stumped as googling does not produce any relevant results. Thanks!

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  • Sync Music to External Hard Drive with Windows Media Player

    - by dtbarne
    I'd like to sync my music from my internal hard drive to an external hard drive. Windows Media Player doesn't recognize my USB external hard drive as a syncable device. If I plug in any USB flash drive, it shows up as a device, but I can't seem to get it to recognize my external hard drive. Per some googling suggestions, the only suggestion I came across was to try enabling the "Portable Device Enumerator" service, but that yielded no luck. Is there any way to sync my music from WMP to an external hard drive?

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  • Windows Media Player 11 Not Detecting Autoplaylists

    - by tuna
    Every time I open Windows Media Player it fails to detect my autoplaylists stored in <my music library dir>\Playlists. This appears to lead to sync problems since I (exclusively) use autoplaylists to sync music to my mobile. As WMP 11 fails to find the any sync autoplaylists it infuriatingly seems to decide that I want no music at all on my phone and proceeds to delete all my music off my phone. I guess these are two seperate problems but it seems to me they are related. If anyone can shed any light on a fix, that would be much appreciated. Many thanks

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  • Laptop changes closing lid power options based on media/music playing

    - by Backdraft
    Hi, This is on a Lenovo X60 running Windows 7 Professional. This is just a pet peeve of mine, but I was wondering if it were somehow possible to have my laptop autodetect whether any media/music is playing on and change/switch the "Close lid" options under Power Options, ie. when something is playing change state to "Do Nothing" otherwise change state to "Sleep". I guess I can probably set a some key combo up with AutoHotKey to do it, but was hoping Windows could detect and switch my Power Options automatically. Thanks.

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