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  • Lost all non-linux hard drives

    - by Rick
    I've somehow lost access to all my non-linux drives. I'm not sure how. I have two other hard drives set up (a windows boot and an external usb I was using under windowsxp). A few days ago I could access both under linux with no problem. Now, I see them listed under media, but when I click on them, nothing is there (same thing happens when I go there in a term window). Now, the computer (under linux) sees them, but I can't see anything in them. (in nautilus it shows "(Empty)") Any ideas what happened or how to get access to them again? My guesses as to what might have caused it: -I was trying to set up AdobeAIR (unsuccessfully) and had to make and remove a couple of symbolic links. Never got that to work but maybe links I made or removed did something? -I was also trying to set up nautilus so that I could enter it with sudo permission. I also didn't figure out how to do that successfully, but maybe something I did while trying messed it up? (I think I installed and uninstalled nautilus-actions configuration tool). Note: I'm working on a relatively new install of 12.04

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  • Can Tornado communicate with Cassandra, in Non-blocking asynchronous style?

    - by takaomag
    I'm working on a web project, which have to process so many client requests. So I am considering to use Cassandra and tornado. Tornado seems to have a build-in client(tornado.httpclient.AsyncHTTPClient), which can do http Non-Blocking request. But, Cassandra uses Thrift protocol. Using Thrift, Tornado seems to be blocked while quering to Cassandra. Has anyone got expereince? Please suggest how should I do. Or, is there any add-on module for this purpose? Thanks.

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  • Can't figure out how to list all the people that don't live in same City as...

    - by AspOnMyNet
    I’d like to list all the people ( Person table ) that don’t live in same city as those cities listed in Location table. Thus, if Location table holds a record with City=’New York’ and State=’Moon’, but Person table holds a record with FirstName=’Someone’, City=’New York’ and Location=’Mars’, then Someone is listed in the resulting set, since she lives in New York located on Mars and not New York located on Moon, thus we’re talking about different cities with the same name. I tried solving it with the following query, but results are wrong: SELECT Person.FirstName, Person.LastName, Person.City, Person.State FROM Person INNER JOIN Location ON (Person.City <> Location.City AND Person.State = Location.State) OR (Person.City = Location.City AND Person.State <> Location.State) OR (Person.City <> Location.City AND Person.State <> Location.State) ORDER BY Person.LastName; Any ideas?

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  • Why ????? is displayed instead of non-english characters?

    - by smhnaji
    I first created a simple HTML page that uses UTF-8 as its character encoding. Then I moved the HTML content as a view in codeigniter and it was still ok (I had used non-english characters that were ok as always) I added a simple dynamic functionality (there is a contact us form in it that emails users feedback to site admin). Please note that the characters were ok at localhost (which is a LAMP server running on Ubuntu 12.04 LTS) Strange is that when I uploaded the app to server, all persian characters are shown as ???? (For example ??? (which means Name) is shown ??? and so so...) I have not even connected to mysql or any other DBMS. It's the only page in the website (it's more an under construction page) and nothing else has been used in it. Maybe I should state that I have also used session library to thank the user after his feedback was sent to admins, nothing else. I have really no idea about the problem. UPDATE Now I can see that the problem is only with cPanel. On Directadmin I can see that everything is normal. Both Chromium and Firefox DO use UTF-8 as page's character encoding. URL is http://WEBSITE.COM/dmf/dynamic/ (dmf is the abbreviation of the project name!). There is nothing non-english in the URL. The page's code is as follows: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>??? ???????</title> <link rel="stylesheet" type="text/css" href="<?php echo base_url('template/css/style.css'); ?>" /> <!-- 1. jquery library --> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"> </script> <!-- 2. flowplayer --> <script src="http://releases.flowplayer.org/5.1.1/flowplayer.min.js"></script> <!-- 3. skin --> <link rel="stylesheet" type="text/css" href="http://releases.flowplayer.org/5.1.1/skin/minimalist.css" /> </head> <body> <div id="wrapper"> <header> <h1>??? ???????</h1> </header> <section id="box-container"> <?php echo form_open('contact', "id='contact-us'"); echo form_fieldset('???? ?? ??'); if ($this->session->userdata('mailsent')) { echo '<div>??????? ???? ??? ????? ??</div>'; $this->session->sess_destroy(); } echo '<input tabindex="1" id="name-in" value="???" type="text" name="name"/> <input tabindex="2" id="mail-in" value="?????" type="email" name="email"/> <textarea tabindex="3" id="content-in" name="message">???????</textarea> <input tabindex="4" id="submit" type="submit" value="?????" />'; echo '<div class="clear"></div>'; echo form_fieldset_close(); echo form_close(); ?> <div id="sms-comp"> <h2>?????? ??????</h2> <p> <span id="comp-title">?? ??? ????</span> ???? ??????? ???? ??? </p> </div> <div id="last-program"> <h2>?????? ????? ??????</h2> <div class="flowplayer"> <video id="my_video_1" width="212" height="126" poster="<?php echo base_url('template/images/img.jpg'); ?>" controls="controls" src="http://archive.org/download/Pbtestfilemp4videotestmp4/video_test.ogv" type='video/mp4'> </video> </div> </div> <div class="clear"></div> </section> </div> <footer> ????? ? ????? : <a href="http://powered-by.com/" target="_blank">????? ???</a> </footer> </body> </html>

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  • Postgres : Post statement (or insert) asynchronous, non-blocking processing.

    - by Hassan Syed
    I'm wondering if it is possible, that after a collection of rows is inserted, to initiate an operation that is executed asynchronously, is non-blocking, and doesn't need to inform the originator of the request - of the result. I am working with large amounts of events and I can guarantee that the post-insert logic will not fail -- I just want to have a single insert thread in my event-sources, and I want this thread to keep flying without blocking, and without being responsible for any post-delivery book-keeping. I can tell you that I would potentially have a 100 of these jobs executing concurrently and each job might operate on 5 tables with anywhere between 200-1000 inserts on each of these tables. A hint in the right direction should be enough.

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  • How can I handle validation of non-latin script input in PHP?

    - by Matt
    I am trying to adapt a php application to handle non-latin scripts (specifically: Japanese, simplified Chinese and Arabic). The app's data validation routines make frequent use of regular expressions to check input, but I am not sure how to adapt the \w character type to other languages without installing additional locales on the system (which I cannot rely on). Previous developers to have worked on the app have simply added needed characters to the regexes as the number of languages we supported grew (you frequently see "[\wÀÁÂÃÄÅÆÇÈÉ... etc" in the code), but I can't really do this for all the alphabets I need to support now. Does anybody out there have some advice on how to tackle this?

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  • Which non-clustered index should I use?

    - by Junior Mayhé
    Here I am studying nonclustered indexes on SQL Server Management Studio. I've created a table with more than 1 million records. This table has a primary key. CREATE TABLE [dbo].[Customers]( [CustomerId] [int] IDENTITY(1,1) NOT NULL, [CustomerName] [varchar](100) NOT NULL, [Deleted] [bit] NOT NULL, [Active] [bit] NOT NULL, CONSTRAINT [PK_Customers] PRIMARY KEY CLUSTERED ( [CustomerId] ASC )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] ) ON [PRIMARY] This is the query I'll be using to see what execution plan is showing: SELECT CustomerName FROM Customers Well, executing this command with no additional non-clustered index, it leads the execution plan to show me: I/O cost = 3.45646 Operator cost = 4.57715 Now I'm trying to see if it's possible to improve performance, so I've created a non-clustered index for this table: 1) First non-clustered index CREATE NONCLUSTERED INDEX [IX_CustomerID_CustomerName] ON [dbo].[Customers] ( [CustomerId] ASC, [CustomerName] ASC )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] GO Executing again the select against Customers table, the execution plan shows me: I/O cost = 2.79942 Operator cost = 3.92001 It seems better. Now I've deleted this just created non-clustered index, in order to create a new one: 2) First non-clustered index CREATE NONCLUSTERED INDEX [IX_CustomerIDIncludeCustomerName] ON [dbo].[Customers] ( [CustomerId] ASC ) INCLUDE ( [CustomerName]) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] GO With this new non-clustered index, I've executed the select statement again and the execution plan shows me the same result: I/O cost = 2.79942 Operator cost = 3.92001 So, which non-clustered index should I use? Why the costs are the same on execution plan for I/O and Operator? Am I doing something wrong or this is expected? thank you

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  • Optimistic non-locking copy of InnoDB .frm files

    - by jothir
    MySQL Enterprise Backup(MEB) does hot backup of innodb data and log files. Till MEB 3.6.1, the user backs up the only innodb tables in a 3 step process: STEP 1. Take backup using --only-innodb option STEP 2. Temporarily make the table read only by executing “FLUSH TABLES WITH READ LOCK” MEB 3.7.0 has an enhancement to innodb file copying. The .frm files gets copied along with the hot backup done for innodb files. I would like to make the blog a little interactive by explaining the feature as answers: 1. What are these .frm files? The files containing the metadata, such as the table definition, of a MySQL table. For backups, the full set of .frm files are always required along with the backup data, to be able to restore tables that are altered or dropped after the backup. 2. Can the .frm files not be copied by MEB itself? --only-innodb-with-frm is the new option introduced in MEB 3.7.1 to do a copy of .frm files without locking the tables during backup operation itself. This is to reduce the pain of manually copying the .frm files. The option is intended for backups where you can ensure that no ALTER TABLE, CREATE TABLE, DROP TABLE, or other DDL statements modify the .frm files for InnoDB tables during the backup operation. 3. How is data consistency ensured? MEB does validation of the .frm files after copying by comparing with the server directory to see if the timestamps of any of the .frm files is greater than the saved system time (check .frm time).  This change in timestamp of the .frm files will show if a table is altered during the process of backup. The total number of frm files in the server directory is also verified against the copied contents. If the number of .frm files is less compared to server directory, it shows that table/tables have been dropped during the process of backup. If the number of .frm files is more compared to server directory, it shows that new table/tables have been created during backup operation. 4. How does MEB handle data inconsistency? MEB copies the .frm files through several iterations,  does the validation and throws a WARNING if there is any inconsistency found in .frm files at the end of backup operation. This means the user is warned of some DDL operations that had occurred during backup operation, and has to manually copy the .frm files or do a backup again. 5. What is the option and explain its usage? The option introduced is --only-innodb-with-frm which does optimistic copy of .frm files without locking. This can be used when the user wants to backup only innodb tables along with .frm files. The option can take one of the 2 values: all | related. --only-innodb-with-frm=all does copy of all .frm files of all innodb tables. --only-innodb-with-frm=related works in conjunction with --include option.This is to allow partial backup of .frm files corresponding to the tables specified in --include. Let me show the usage with example output: ./mysqlbackup -uroot --backup-dir=/logs/backupWithFrmAll --only-innodb-with-frm=all backup MySQL Enterprise Backup version 3.7.1 [2012/06/05] Copyright (c) 2003, 2012, Oracle and/or its affiliates. All Rights Reserved. INFO: Starting with following command line ... ./mysqlbackup -uroot --backup-dir=/logs/backupWithFrmAll        --only-innodb-with-frm=all backup INFO: Got some server configuration information from running server. IMPORTANT: Please check that mysqlbackup run completes successfully.            At the end of a successful 'backup' run mysqlbackup            prints "mysqlbackup completed OK!". --------------------------------------------------------------------                       Server Repository Options: --------------------------------------------------------------------  datadir                          =  /mysql/trydb/  innodb_data_home_dir             =    innodb_data_file_path            =  ibdata1:10M:autoextend  innodb_log_group_home_dir        =  /mysql/trydb/  innodb_log_files_in_group        =  2  innodb_log_file_size             =  5242880 --------------------------------------------------------------------                       Backup Config Options: --------------------------------------------------------------------  datadir                          =  /logs/backupWithFrmAll/datadir  innodb_data_home_dir             =  /logs/backupWithFrmAll/datadir  innodb_data_file_path            =  ibdata1:10M:autoextend  innodb_log_group_home_dir        =  /logs/backupWithFrmAll/datadir  innodb_log_files_in_group        =  2  innodb_log_file_size             =  5242880 mysqlbackup: INFO: Unique generated backup id for this is 13451979804504860 mysqlbackup: INFO: Uses posix_fadvise() for performance optimization. mysqlbackup: INFO: System tablespace file format is Antelope. mysqlbackup: INFO: Found checkpoint at lsn 1656792. mysqlbackup: INFO: Starting log scan from lsn 1656320. 120817 15:36:22 mysqlbackup: INFO: Copying log... 120817 15:36:22 mysqlbackup: INFO: Log copied, lsn 1656792.          We wait 1 second before starting copying the data files... 120817 15:36:23 mysqlbackup: INFO: Copying /mysql/trydb/ibdata1 (Antelope file format). 120817 15:36:23 mysqlbackup: INFO: Copying /mysql/trydb/innodb1/table2.ibd (Antelope file format). 120817 15:36:23 mysqlbackup: INFO: Copying /mysql/trydb/innodb1/table3.ibd (Antelope file format). 120817 15:36:23 mysqlbackup: INFO: Copying /mysql/trydb/innodb1/table1.ibd (Antelope file format). mysqlbackup: INFO: Opening backup source directory '/mysql/trydb/' 120817 15:36:23 mysqlbackup: INFO: Starting to backup .frm files in the subdirectories of /mysql/trydb/ mysqlbackup: INFO: Copying innodb data and logs during final stage ... mysqlbackup: INFO: A copied database page was modified at 1656792.          (This is the highest lsn found on page)          Scanned log up to lsn 1656792.          Was able to parse the log up to lsn 1656792.          Maximum page number for a log record 0 mysqlbackup: INFO: Copying non-innodb files took 2.000 seconds 120817 15:36:25 mysqlbackup: INFO: Full backup completed! mysqlbackup: INFO: Backup created in directory '/logs/backupWithFrmAll' -------------------------------------------------------------   Parameters Summary          -------------------------------------------------------------   Start LSN                  : 1656320   End LSN                    : 1656792 ------------------------------------------------------------- mysqlbackup completed OK! bash$ ls /logs/backupWithFrmAll/datadir/innodb1/ table1.frm  table1.ibd  table2.frm  table2.ibd  table3.frm  table3.ibd Here the backup directory contains all the .frm files of all the innodb tables. ./mysqlbackup -uroot --backup-dir=/logs/backupWithFrm --include="innodb1.table3.*" --only-innodb-with-frm=related backup MySQL Enterprise Backup version 3.7.1 [2012/06/05] Copyright (c) 2003, 2012, Oracle and/or its affiliates. All Rights Reserved. INFO: Starting with following command line ... ./mysqlbackup -uroot --backup-dir=/logs/backup371frm        --include=innodb1.table3.* --only-innodb-with-frm=related backup INFO: Got some server configuration information from running server. IMPORTANT: Please check that mysqlbackup run completes successfully.            At the end of a successful 'backup' run mysqlbackup            prints "mysqlbackup completed OK!". --------------------------------------------------------------------                       Server Repository Options: --------------------------------------------------------------------  datadir                          = /mysql/trydb/  innodb_data_home_dir             =    innodb_data_file_path            =  ibdata1:10M:autoextend  innodb_log_group_home_dir        =  /mysql/trydb  innodb_log_files_in_group        =  2  innodb_log_file_size             =  5242880 --------------------------------------------------------------------                       Backup Config Options: --------------------------------------------------------------------  datadir                          =  /logs/backupWithFrm/datadir  innodb_data_home_dir             =  /logs/backupWithFrm/datadir  innodb_data_file_path            =  ibdata1:10M:autoextend  innodb_log_group_home_dir        =  /logs/backupWithFrm/datadir  innodb_log_files_in_group        =  2  innodb_log_file_size             =  5242880 mysqlbackup: INFO: Unique generated backup id for this is 13451973458118162 mysqlbackup: INFO: Uses posix_fadvise() for performance optimization. mysqlbackup: INFO: The --include option specified: innodb1.table3.* mysqlbackup: INFO: System tablespace file format is Antelope. mysqlbackup: INFO: Found checkpoint at lsn 1656792. mysqlbackup: INFO: Starting log scan from lsn 1656320. 120817 15:25:47 mysqlbackup: INFO: Copying log... 120817 15:25:47 mysqlbackup: INFO: Log copied, lsn 1656792.          We wait 1 second before starting copying the data files... 120817 15:25:48 mysqlbackup: INFO: Copying /mysql/trydbibdata1 (Antelope file format). 120817 15:25:49 mysqlbackup: INFO: Copying /mysql/trydbinnodb1/table3.ibd (Antelope file format). mysqlbackup: INFO: Opening backup source directory '/mysql/trydb' 120817 15:25:49 mysqlbackup: INFO: Starting to backup .frm files in the subdirectories of /mysql/trydb mysqlbackup: INFO: Copying innodb data and logs during final stage ... mysqlbackup: INFO: A copied database page was modified at 1656792.          (This is the highest lsn found on page)          Scanned log up to lsn 1656792.          Was able to parse the log up to lsn 1656792.          Maximum page number for a log record 0 mysqlbackup: INFO: Copying non-innodb files took 2.000 seconds 120817 15:25:51 mysqlbackup: INFO: Full backup completed! mysqlbackup: INFO: Backup created in directory '/logs/backupWithFrm' -------------------------------------------------------------   Parameters Summary          -------------------------------------------------------------   Start LSN                  : 1656320   End LSN                    : 1656792 ------------------------------------------------------------- mysqlbackup completed OK! bash$ ls /logs/backupWithFrm/datadir/innodb1/ table3.frm table3.ibd Thus the backup directory contains only the .frm file matching the innodb table name specified in --include option. In a nutshell, we present our great new option --only-innodb-with-frm which is a true hot InnoDB-only backup with .frm files, but with an additional check, if any DDL happened during the backup. If a DDL has happened, the DBA can decide if to repeat the backup, or to live with the potential inconsistency. This is the ideal solution for users that have all their "real" data in InnoDB and seldom change their schemas. You may also like: http://dev.mysql.com/doc/mysql-enterprise-backup/3.7/en/backup-partial-options.html   STEP 3. Manually copy the .frm files of innodb tables to the destination directory where backup is stored.

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  • Idea for a user friendly/non technical RAD tool for performing queries and reports on Database

    - by pierocampanelli
    I am investigating for a tool that allows a user to perform in a user friendly way queries to database for extracting datas and creating reports. Primary requirement is that we can't know queries users are going to do. So we need to design a flexible UI allowing them to specify in a non technical way. My question is: do you know any tool that does something similar? Have you some inspiring user interface?

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  • Books on hiring technical people?

    - by Mark Gibaud
    I've just finished reading "Smart, and Gets Things Done" and while entertaining and byte-sized ;-) I found it a little US-centric and slightly less applicable to workplaces that are "only" above-average instead of rockstar--at-work places. I'm looking for more books on how to hire technical people. The only other one that has been recommended is Hiring the Best Knowledge Workers... Can anyone recommend any more?

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  • As3: Plotting text as in technical drawings

    - by Cambiata
    Hi! Flash/Actionscript 3 lack the possibility to "draw" text to a displayobject graphics - a textfield has to be created, added and set. This is rather clumsy and time consuming. In the wait for simple and stable alternatives (for example http://lab.polygonal.de/2009/12/15/font-rendering-with-the-fp10-drawing-api/), is there a class or library for simply plotting text strings using graphical primitives (lines), something like the text is "drawn" on plotted technical drawings?

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  • Is speed reading good for technical / programming books?

    - by Ekkapop
    I will register as graduate student, and my friend has suggested I attend a speed reading class. (He is MBA student). I don't know whether it is good to attend this course or not, but at this moment almost of my textbook required time to think about its content. Has anyone applied speed reading with technical books? Is it good to attend this course?

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  • Resources on technical GUI design

    - by Thomas Lötzer
    Hi, I am looking for recommendations on resources (both books and websites) on designing GUI applications. By designing I mean the technical design (when and how to use data binding, when should MVC/MVP be used, what functionality should go into the model, the view, the controller/presenter, how can different parts of the UI best be kept in sync ...), not the screen design of which button goes where or how the interaction with the user should take place. Thanks, Thomas

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  • How to do more programming/technical stuff?

    - by Bell
    I working as an IT consultant and I am currently doing functional stuff like requirements gathering, documentations and writing test specs etc. I kind of sick of this kind of job scope and wish to do more programming/ design / technical stuff. Because I get more satisfaction doings the things rather than telling other to do Anyone in the same dilemma as me and any suggestions on how to get on with working life?

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  • Turn Non-Resizeable Windows into Rezieable Windows

    - by Asian Angel
    Are you frustrated with Windows app windows that can not be resized at all? Now you can apply some “attitude adjustment” and resize those windows with ResizeEnable. Before Everyone is familiar with the many app windows in their Windows OS that simply can not be resized. What you need is cooperation, not attitude. For our example we chose the “Taskbar and Start Menu Properties Window”…notice the cursor in the lower right corner. No resizing satisfaction available at all… After The program comes in a zip file with three files as shown here. Once you have unzipped the program place it in an appropriate “Program Files Folder”, create a shortcut, and you are ready to go. There will be a “System Tray Icon” with only two “Context Menu” items…“About & Quit”. Here is a quick look at the “About Window” that tells you exactly what ResizeEnable does. Notice that it does state that you may occasionally have a window that may not respond correctly. Now back to our “Taskbar and Start Menu Properties Window”. Notice the resizing cursor in the lower right corner….time for some fun! During our test the “Taskbar and Start Menu Properties Window” was suddenly a dream to resize. Daring to stretch the window even further…now that is what you call “stretching” the window out in comparison to its’ original size! Think of all the windows that will be much easier to work with now… Conclusion If you have been frustrated with non-resizeable windows then ResizeEnable will certainly bring a smile to your face as you watch those windows suddenly become a lot more cooperative. This is definitely one app that is worth adding to your system. Links Download ResizeEnable (zip file) Similar Articles Productive Geek Tips Quick Tip: Resize Any Textbox or Textarea in FirefoxTurn on Remote Desktop in Windows 7 or VistaSave 1-4% More Battery Life With Windows Vista Battery SaverQuick Tip: Disable Search History Display in Windows 7Turn Off Windows Explorer Click Sounds in Windows 7 or Vista TouchFreeze Alternative in AutoHotkey The Icy Undertow Desktop Windows Home Server – Backup to LAN The Clear & Clean Desktop Use This Bookmarklet to Easily Get Albums Use AutoHotkey to Assign a Hotkey to a Specific Window Latest Software Reviews Tinyhacker Random Tips Revo Uninstaller Pro Registry Mechanic 9 for Windows PC Tools Internet Security Suite 2010 PCmover Professional New Stinger from McAfee Helps Remove ‘FakeAlert’ Threats Google Apps Marketplace: Tools & Services For Google Apps Users Get News Quick and Precise With Newser Scan for Viruses in Ubuntu using ClamAV Replace Your Windows Task Manager With System Explorer Create Talking Photos using Fotobabble

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  • What are the most commonly used enterprise Java technologies, and what would you want a non technical audience to understand about them?

    - by overstood
    I have been asked to give a presentation to a non-technical audience on what Java technologies are currently being used in the enterprise world. The goal is to give this non-technical audience the background they need to understand what engineers are talking about. It's part of a broader series of talks that I'm giving. I'm primarily a .NET and C++ dev, so I thought I'd try to get some input from some Java devs. What technologies do you use? What Java related acronyms would you like to be able to use around non-coders? What would you like non-coders to understand about them?

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  • Movement prediction for non-shooters

    - by ShadowChaser
    I'm working on an isometric (2D) game with moderate-scale multiplayer - 20-30 players. I've had some difficulty getting a good movement prediction implementation in place. Right now, clients are authoritative for their own position. The server performs validation and broad-scale cheat detection, and I fully realize that the system will never be fully robust against cheating. However, the performance and implementation tradeoffs work well for me right now. Given that I'm dealing with sprite graphics, the game has 8 defined directions rather than free movement. Whenever the player changes their direction or speed (walk, run, stop), a "true" 3D velocity is set on the entity and a packet it sent to the server with the new movement state. In addition, every 250ms additional packets are transmitted with the player's current position for state updates on the server as well as for client prediction. After the server validates the packet, it gets automatically distributed to all of the other "nearby" players. Client-side, all entities with non-zero velocity (ie/ moving entities) are tracked and updated by a rudimentary "physics" system - basically nothing more than changing the position by the velocity according to the elapsed time slice (40ms or so). What I'm struggling with is how to implement clean movement prediction. I have the nagging suspicion that I've made a design mistake somewhere. I've been over the Unreal, Half-life, and all other movement prediction/lag compensation articles I could find, but they all seam geared toward shooters: "Don't send each control change, send updates every 120ms, server is authoritative, client predicts, etc". Unfortunately, that style of design won't work well for me - there's no 3D environment so each individual state change is important. 1) Most of the samples I saw tightly couple movement prediction right into the entities themselves. For example, storing the previous state along with the current state. I'd like to avoid that and keep entities with their "current state" only. Is there a better way to handle this? 2) What should happen when the player stops? I can't interpolate to the correct position, since they might need to walk backwards or another strange direction if their position is too far ahead. 3) What should happen when entities collide? If the current player collides with something, the answer is simple - just stop the player from moving. But what happens if two entities take up the same space on the server? What if the local prediction causes a remote entity to collide with the player or another entity - do I stop them as well? If the prediction had the misfortune of sticking them in front of a wall that the player has gone around, the prediction will never be able to compensate and once the error gets to high the entity will snap to the new position.

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  • reference list for non-IT driven algorithmic patterns

    - by Quicker
    I am looking for a reference list for non-IT driven algorithmic patterns (which still can be helped with IT implementations of IT). An Example List would be: name; short desc; reference Travelling Salesman; find the shortest possible route on a multiple target path; http://en.wikipedia.org/wiki/Travelling_salesman_problem Ressource Disposition (aka Regulation); Distribute a limited/exceeding input on a given number output receivers based on distribution rules; http://database-programmer.blogspot.de/2010/12/critical-analysis-of-algorithm-sproc.html If there is no such list, but you instantly think of something specific, please 'put it on the desk'. Maybe I can compile something out of the input I get here (actually I am very frustrated as I did not find any such list via research by myself). Details on Scoping: I found it very hard to formulate what I want in a way everything is out that I do not need (which may be the issue why I did not find anything at google). There is a database centric definition for what I am looking for in the section 'Processes' of the second example link. That somehow fits, but the database focus sort of drifts away from the pattern thinking, which I have in mind. So here are my own thoughts around what's in and what's out: I am NOT looking for a foundational algo ref list, which is implemented as basis for any programming language. Eg. the php reference describes substr and strlen. That implements algos, but is not what I am looking for. the problem the algo does address would even exist, if there were no computers (or other IT components) the main focus of the algo is NOT to help other algo's chances are high, that there are implementions of the solution or any workaround without any IT support out there in the world however the algo could be benefitialy implemented/fully supported by a software application = means: the problem of the algo has to be addressed anyway, but running an algo implementation with software automates the process (that is why I posted it on stackoverflow and not somewhere else) typically such algo implementations have more than one input field value and more than one output field value - which implies it could not be implemented as simple function (which is fixed to produce not more than one output value) in a normalized data model often times such algo implementation outputs span accross multiple rows (sometimes multiple tables), whereby the number of output rows depends on the input paraters and rows in the table(s) at start time - which implies that any algo implementation/procedure must interact with a database (read and/or write) I am mainly looking for patterns, not for specific implementations. Example: The Travelling Salesman assumes any coordinates, however it does not say: You need a table targets with fields x and y. - however sometimes descriptions are focussed on examples with specific implementations very much - no worries, as long as the pattern gets clear

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  • How to resize / enlarge / grow a non-LVM ext4 partition

    - by Mischa
    I have already searched the forums, but couldnt find a good suitable answer: I have an Ubuntu Server 10.04 as KVM Host and a guest system, that also runs 10.04. The host system uses LVM and there are three logical volumes, which are provided to the guest as virtual block devices - one for /, one for /home and one for swap. The guest had been partitioned without LVM. I have already enlarged the logical volume in the host system - the guest successfully sees the bigger virtual disk. However, this virtual disk contains one "good old" partition, which still has the old small size. The output of fdisk -l is me@produktion:/$ LC_ALL=en_US sudo fdisk -l Disk /dev/vda: 32.2 GB, 32212254720 bytes 255 heads, 63 sectors/track, 3916 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000c8ce7 Device Boot Start End Blocks Id System /dev/vda1 * 1 3917 31455232 83 Linux Disk /dev/vdb: 2147 MB, 2147483648 bytes 244 heads, 47 sectors/track, 365 cylinders Units = cylinders of 11468 * 512 = 5871616 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000f2bf7 Device Boot Start End Blocks Id System /dev/vdb1 1 366 2095104 82 Linux swap / Solaris Partition 1 has different physical/logical beginnings (non-Linux?): phys=(0, 32, 33) logical=(0, 43, 28) Partition 1 has different physical/logical endings: phys=(260, 243, 47) logical=(365, 136, 44) Disk /dev/vdc: 225.5 GB, 225485783040 bytes 255 heads, 63 sectors/track, 27413 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00027f25 Device Boot Start End Blocks Id System /dev/vdc1 1 9138 73398272 83 Linux The output of parted print all is Model: Virtio Block Device (virtblk) Disk /dev/vda: 32.2GB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 1049kB 32.2GB 32.2GB primary ext4 boot Model: Virtio Block Device (virtblk) Disk /dev/vdb: 2147MB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 1049kB 2146MB 2145MB primary linux-swap(v1) Model: Virtio Block Device (virtblk) Disk /dev/vdc: 225GB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 1049kB 75.2GB 75.2GB primary ext4 What I want to achieve is to simply grow or resize the partition /dev/vdc1 so that it uses the whole space provided by the virtual block device /dev/vdc. The problem is, that when I try to do that with parted, it complains: (parted) select /dev/vdc Using /dev/vdc (parted) print Model: Virtio Block Device (virtblk) Disk /dev/vdc: 225GB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 1049kB 75.2GB 75.2GB primary ext4 (parted) resize 1 WARNING: you are attempting to use parted to operate on (resize) a file system. parted's file system manipulation code is not as robust as what you'll find in dedicated, file-system-specific packages like e2fsprogs. We recommend you use parted only to manipulate partition tables, whenever possible. Support for performing most operations on most types of file systems will be removed in an upcoming release. Start? [1049kB]? End? [75.2GB]? 224GB Error: File system has an incompatible feature enabled. Compatible features are has_journal, dir_index, filetype, sparse_super and large_file. Use tune2fs or debugfs to remove features. So what can I do? This is a headless production system. What is a safe way to grow this partition? I CAN unmount it, though - so this is not the problem.

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  • OBI10g will be Non-Qualifying for OPN Specialisation in September 2013

    - by Mike.Hallett(at)Oracle-BI&EPM
    aboteste 12.00 Just to alert you, that OPN Specialisation is software version-specific: so as we bring out new product versions, so the specialisation crtiteria and exam needs to keep updated to the new version. Specifically for our analytics partners, be aware that your “OBI10g Specialisation” credentials will be Non-Qualifying for OPN Specialisation in September 2013. Therefore to keep your profile up to date please start now to take the latest OBI11g exams and apply to OPN to upgrade to “OBI11g Specialisation”. Find out more about the new version OBI11g Exams to update your OPN Specialisation @ OPN Exam for OBI Suite 11g is Now LIVE, and more generally the Update on BI & EPM Specializations and Knowledge Zones. aboteste 12.00 Normal 0 false false false EN-GB X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin-top:0cm; mso-para-margin-right:0cm; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi; mso-fareast-language:EN-US;} And to help you pass, see the Oracle Business Intelligence Foundation Suite 11 Essentials Exam Study Guide. Also check the documents on OPN for Frequently Asked Questions for Product Version Specialization and the latest Specializations Catalog. Normal 0 false false false EN-GB X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin-top:0cm; mso-para-margin-right:0cm; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi; mso-fareast-language:EN-US;}

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  • Determine duplicate record for duplicate and non-duplicate records

    - by gibboo
    I have a files containing both duplicate and non-duplicate records. The file is already sorted by a key. I want to determine those records that are duplicate and records that are non-duplicate. If duplicate the record is moved to a duplicate file and if non-duplicate that will be moved to valid file. I am using COBOL, and occurence of records for duplicate and non-duplicate is more than twice.

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