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  • Developing Schema Compare for Oracle (Part 1)

    - by Simon Cooper
    SQL Compare is one of Red Gate's most successful SQL Server tools; it allows developers and DBAs to compare and synchronize the contents of their databases. Although similar tools exist for Oracle, they are quite noticeably lacking in the usability and stability that SQL Compare is known for in the SQL Server world. We could see a real need for a usable schema comparison tools for Oracle, and so the Schema Compare for Oracle project was born. Over the next few weeks, as we come up to release of v1, I'll be doing a series of posts on the development of Schema Compare for Oracle. For the first post, I thought I would start with the main pitfalls that we stumbled across when developing the product, especially from a SQL Server background. 1. Schemas and Databases The most obvious difference is that the concept of a 'database' is quite different between Oracle and SQL Server. On SQL Server, one server instance has multiple databases, each with separate schemas. There is typically little communication between separate databases, and most databases are no more than about 1000-2000 objects. This means SQL Compare can register an entire database in a reasonable amount of time, and cross-database dependencies probably won't be an issue. It is a quite different scene under Oracle, however. The terms 'database' and 'instance' are used interchangeably, (although technically 'database' refers to the datafiles on disk, and 'instance' the running Oracle process that reads & writes to the database), and a database is a single conceptual entity. This immediately presents problems, as it is infeasible to register an entire database as we do in SQL Compare; in my Oracle install, using the standard recommended options, there are 63975 system objects. If we tried to register all those, not only would it take hours, but the client would probably run out of memory before we finished. As a result, we had to allow people to specify what schemas they wanted to register. This decision had quite a few knock-on effects for the design, which I will cover in a future post. 2. Connecting to Oracle The next obvious difference is in actually connecting to Oracle – in SQL Server, you can specify a server and database, and off you go. On Oracle things are slightly more complicated. SIDs, Service Names, and TNS A database (the files on disk) must have a unique identifier for the databases on the system, called the SID. It also has a global database name, which consists of a name (which doesn't have to match the SID) and a domain. Alternatively, you can identify a database using a service name, which normally has a 1-to-1 relationship with instances, but may not if, for example, using RAC (Real Application Clusters) for redundancy and failover. You specify the computer and instance you want to connect to using TNS (Transparent Network Substrate). The user-visible parts are a config file (tnsnames.ora) on the client machine that specifies how to connect to an instance. For example, the entry for one of my test instances is: SC_11GDB1 = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = simonctest)(PORT = 1521)) ) (CONNECT_DATA = (SID = 11gR1db1) ) ) This gives the hostname, port, and SID of the instance I want to connect to, and associates it with a name (SC_11GDB1). The tnsnames syntax also allows you to specify failover, multiple descriptions and address lists, and client load balancing. You can then specify this TNS identifier as the data source in a connection string. Although using ODP.NET (the .NET dlls provided by Oracle) was fine for internal prototype builds, once we released the EAP we discovered that this simply wasn't an acceptable solution for installs on other people's machines. Due to .NET assembly strong naming, users had to have installed on their machines the exact same version of the ODP.NET dlls as we had on our build server. We couldn't ship the ODP.NET dlls with our installer as the Oracle license agreement prohibited this, and we didn't want to force users to install another Oracle client just so they can run our program. To be able to list the TNS entries in the connection dialog, we also had to locate and parse the tnsnames.ora file, which was complicated by users with several Oracle client installs and intricate TNS entries. After much swearing at our computers, we eventually decided to use a third party Oracle connection library from Devart that we could ship with our program; this could use whatever client version was installed, parse the TNS entries for us, and also had the nice feature of being able to connect to an Oracle server without having any client installed at all. Unfortunately, their current license agreement prevents us from shipping an Oracle SDK, but that's a bridge we'll cross when we get to it. 3. Running synchronization scripts The most important difference is that in Oracle, DDL is non-transactional; you cannot rollback DDL statements like you can on SQL Server. Although we considered various solutions to this, including using the flashback archive or recycle bin, or generating an undo script, no reliable method of completely undoing a half-executed sync script has yet been found; so in this case we simply have to trust that the DBA or developer will check and verify the script before running it. However, before we got to that stage, we had to get the scripts to run in the first place... To run a synchronization script from SQL Compare we essentially pass the script over to the SqlCommand.ExecuteNonQuery method. However, when we tried to do the same for an OracleConnection we got a very strange error – 'ORA-00911: invalid character', even when running the most basic CREATE TABLE command. After much hair-pulling and Googling, we discovered that Oracle has got some very strange behaviour with semicolons at the end of statements. To understand what's going on, we need to take a quick foray into SQL and PL/SQL. PL/SQL is not T-SQL In SQL Server, T-SQL is the language used to interface with the database. It has DDL, DML, control flow, and many other nice features (like Turing-completeness) that you can mix and match in the same script. In Oracle, DDL SQL and PL/SQL are two completely separate languages, with different syntax, different datatypes and different execution engines within the instance. Oracle SQL is much more like 'pure' ANSI SQL, with no state, no control flow, and only the basic DML commands. PL/SQL is the Turing-complete language, but can only do DML and DCL (i.e. BEGIN TRANSATION commands). Any DDL or SQL commands that aren't recognised by the PL/SQL engine have to be passed back to the SQL engine via an EXECUTE IMMEDIATE command. In PL/SQL, a semicolons is a valid token used to delimit the end of a statement. In SQL, a semicolon is not a valid token (even though the Oracle documentation gives them at the end of the syntax diagrams) . When you execute the command CREATE TABLE table1 (COL1 NUMBER); in SQL*Plus the semicolon on the end is a command to SQL*Plus to execute the preceding statement on the server; it strips off the semicolon before passing it on. SQL Developer does a similar thing. When executing a PL/SQL block, however, the syntax is like so: BEGIN INSERT INTO table1 VALUES (1); INSERT INTO table1 VALUES (2); END; / In this case, the semicolon is accepted by the PL/SQL engine as a statement delimiter, and instead the / is the command to SQL*Plus to execute the current block. This explains the ORA-00911 error we got when trying to run the CREATE TABLE command – the server is complaining about the semicolon on the end. This also means that there is no SQL syntax to execute more than one DDL command in the same OracleCommand. Therefore, we would have to do a round-trip to the server for every command we want to execute. Obviously, this would cause lots of network traffic and be very slow on slow or congested networks. Our first attempt at a solution was to wrap every SQL statement (without semicolon) inside an EXECUTE IMMEDIATE command in a PL/SQL block and pass that to the server to execute. One downside of this solution is that we get no feedback as to how the script execution is going; we're currently evaluating better solutions to this thorny issue. Next up: Dependencies; how we solved the problem of being unable to register the entire database, and the knock-on effects to the whole product.

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  • Oracle GoldenGate 11gR2 New Feature: Integrated Capture

    - by Doug Reid
    0 false 18 pt 18 pt 0 0 false false false /* 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-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Times New Roman"; mso-ascii-font-family:Cambria; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Cambria; mso-hansi-theme-font:minor-latin;} With the release of Oracle GoldenGate 11gR2, the Product Management team is very excited about the addition of Integrated Capture for the Oracle platform. Integrated capture is unique in the industry and unique to the Oracle database. It is not available on any other database platform. This new feature moves GoldenGate’s capture capabilities closer to the Oracle Database engine and is the foundation for Oracle GoldenGate on the Oracle Database platform over the long term. It is important to note that Integrated Capture does not replace our classic Capture process. Both are available on the Oracle Database platform. The Integrated Capture mechanism relies on Oracle’s internal log parsing and processing to capture DML transactions. By moving closer to the Oracle Database engine, Oracle GoldenGate can take advantage of new Oracle Database features and functionality more quickly. For example, this new mechanism allows GoldenGate to support advanced features such as compression. Integrated Capture provides support for all flavors of Oracle compression, including hybrid columnar compression (EHCC) on Exadata, where as our “Classic” capture would not. Integrated Capture supports two different deployment configurations; On-Source and Downstream. The on-source deployment model is what most customers are familiar with. Oracle GoldenGate is executing on the database server capturing changes in real time. This is the default deployment method. The other option is downstream, where the source database and the Oracle GoldenGate Capture process are on different machines. This method effectively off-loads the processing requirements to a second machine. Customers may choose which option they prefer based on their requirements.   Additional information on Integrated Capture can be found in our documentation and the white paper “Oracle GoldenGate for Oracle”.

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  • Squid/Kerberos authentication with only Linux

    - by user28362
    Hi, I would like to know if it possible to let a Windows Xp machine authenticate to Squid (Linux) using Kerberos without the need of an Active Directory domain. I only want to create a Kerberos ticket on the client side, which should give the client access to squid (using I.E.). I only found tutorials about configuring A.D./Squid, not an environment with only Linux servers. Thanks Update: The kerberos setup is correctly done, the proxy and client can get tickets. As for the browser (FF/IE), I get: ERROR Cache Access Denied While trying to retrieve the URL: http://www.google.com/ The following error was encountered: * Cache Access Denied. Sorry, you are not currently allowed to request: http://www.google.com/ from this cache until you have authenticated yourself. In kerberos, I get: squid_kerb_auth: Got 'YR ElRNTVMTUABBAABAB4IIogAAAAAAAAAAAAAAAAAAAAAFASgDAAAADw==' from squid (length: 59). squid_kerb_auth: parseNegTokenInit failed with rc=101 squid_kerb_auth: received type 1 NTLM token This message is strange, as I didn't configure NTLM. It looks like the browser uses the wrong authentication methode.

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  • Pitivi video editor (gstreamer errors)

    - by The Programmer
    The error messages are not helpful in diagnosing what's broken here: What can be done to make Pitivi and gstreamer work better together? Should I just give up on Pitivi and go with another tool? ERROR [15963] [0x7fb986aed700] "" pipeline Sep 18 19:31:14 _errorObject: error from /GstPipeline:pipeline1/GstBin:bin1/GnlComposition:gnlcomposition3/GnlSource:gnlsource: AudioTestSourceFactory3/GstBin:bin5/GstAudioTestSrc:real-audiotestsrc (main.GstAudioTestSrc): GStreamer encountered a general stream error. (gstbasesrc.c(2507): gst_base_src_loop (): /GstPipeline:pipeline1/GstBin:bin1/GnlComposition:gnlcomposition3/GnlSource:gnlsource: AudioTestSourceFactory3/GstBin:bin5/GstAudioTestSrc:real-audiotestsrc: streaming task paused, reason not-negotiated (-4)) (/usr/lib/pitivi/python/pitivi/log/loggable.py:30)

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  • CodePlex Daily Summary for Saturday, June 07, 2014

    CodePlex Daily Summary for Saturday, June 07, 2014Popular ReleasesSFDL.NET: SFDL.NET (2.2.9.3): Changelog: Retry Bugfix (Error Counter wurde nicht korrekt zurückgesetzt) Neue Einstellung: Retry Wartezeit ist nun EinstellbarLoad Runner - HTTP Pressure Test Tool: Load Runner 1.2: 1. added support for distributed load test (read documentation for details) 2. added detail documentationAspose for Apache POI: Aspose.Words vs Apache POI WP - v 1.1: Release contain the Code Comparison for Features in Apache POI WP SDK and Aspose.Words What's New ?Following Examples: Working with Headers Working with Footers Access Ranges in Document Delete Ranges in Document Insert Before and After Ranges Feedback and Suggestions Many more examples are yet to come here. Keep visiting us. Raise your queries and suggest more examples via Aspose Forums or via this social coding site.babelua: 1.5.7.0: V1.5.7.0 - 2014.6.6Stability improvement: use "lua scripts folder" as lua search path when debugging;SEToolbox: SEToolbox 01.033.007 Release 1: Fixed breaking changes in Space Engineers in latest update. Installation of this version will replace older version.Virto Commerce Enterprise Open Source eCommerce Platform (asp.net mvc): Virto Commerce 1.10: Virto Commerce Community Edition version 1.10. To install the SDK package, please refer to SDK getting started documentation To configure source code package, please refer to Source code getting started documentation This release includes bug fixes and improvements (including Commerce Manager localization and https support). More details about this release can be found on our blog at http://blog.virtocommerce.com.NPOI: NPOI 2.1: Assembly Version: 2.1.0 New Features a. XSSFSheet.CopySheet b. Excel2Html for XSSF c. insert picture in word 2007 d. Implement IfError function in formula engine Bug Fixes a. fix conditional formatting issue b. fix ctFont order issue c. fix vertical alignment issue in XSSF d. add IndexedColors to NPOI.SS.UserModel e. fix decimal point issue in non-English culture f. fix SetMargin issue in XSSF g.fix multiple images insert issue in XSSF h.fix rich text style missing issue in XSSF i. fix cell...51Degrees - Device Detection and Redirection: 3.1.2.3: Version 3.1 HighlightsDevice detection algorithm is over 100 times faster. Regular expressions and levenshtein distance calculations are no longer used. The device detection algorithm performance is no longer limited by the number of device combinations contained in the dataset. Two modes of operation are available: Memory – the detection data set is loaded into memory and there is no continuous connection to the source data file. Slower initialisation time but faster detection performanc...CS-Script for Notepad++ (C# intellisense and code execution): Release v1.0.27.0: CodeMap now indicates the type name for all members Implemented running scripts 'as administrator'. Just add '//css_npp asadmin' to the script and run it as usual. 'Prepare script for distribution' now aggregates script dependency assemblies. Various improvements in CodeSnipptet, Autcompletion and MethodInfo interactions with each other. Added printing line number for the entries in CodeMap (subject of configuration value) Improved debugging step indication for classless scripts ...Kartris E-commerce: Kartris v2.6003: Bug fixes: Fixed issue where category could not be saved if parent categories not altered Updated split string function to 500 chars otherwise problems with attribute filtering in PowerPack Improvements: If a user has group pricing below that available through qty discounts, that will show in place of the qty discountClosedXML - The easy way to OpenXML: ClosedXML 0.72.3: 70426e13c415 ClosedXML for .Net 4.0 now uses Open XML SDK 2.5 b9ef53a6654f Merge branch 'master' of https://git01.codeplex.com/forks/vbjay/closedxml 727714e86416 Fix range.Merge(Boolean) for .Net 3.5 eb1ed478e50e Make public range.Merge(Boolean checkIntersects) 6284cf3c3991 More performance improvements when saving.DNN Blog: 06.00.07: Highlights: Enhancement: Option to show management panel on child modules Fix: Changed SPROC and code to ensure the right people are notified of pending comments. (CP-24018) Fix: Fix to have notification actions authentication assume the right module id so these will work from the messaging center (CP-24019) Fix: Fix to issue in categories in a post that will not save when no categories and no tags selectedcsv2xlsx: Source code: Source code of applicationFamily Tree Analyzer: Version 4.0.0.0-beta5: This major release introduces a significant new feature the ability to search the UK Ordnance Survey 50k Gazetteer for small placenames that often don't appear on a modern Google Map. This means significant numbers of locations that were previously not found by Google Geocoding will now be found by using OS Geocoding. In addition I've added support for loading the Scottish 1930 Parish boundary maps, whilst slightly different from the parish boundaries in use in the 1800s that are familiar to...TEncoder: 4.0.0: --4.0.0 -Added: Video downloader -Added: Total progress will be updated more smoothly -Added: MP4Box progress will be shown -Added: A tool to create gif image from video -Added: An option to disable trimming -Added: Audio track option won't be used for mpeg sources as default -Fixed: Subtitle position wasn't used -Fixed: Duration info in the file list wasn't updated after trimming -Updated: FFMpegVeraCrypt: VeraCrypt version 1.0d: Changes between 1.0c and 1.0d (03 June 2014) : Correct issue while creating hidden operating system. Minor fixes (look at git history for more details).Microsoft Web Protection Library: AntiXss Library 4.3.0: Download from nuget or the Microsoft Download Center This issue finally addresses the over zealous behaviour of the HTML Sanitizer which should now function as expected once again. HTML encoding has been changed to safelist a few more characters for webforms compatibility. This will be the last version of AntiXSS that contains a sanitizer. Any new releases will be encoding libraries only. We recommend you explore other sanitizer options, for example AntiSamy https://www.owasp.org/index....ConEmu - Windows console with tabs: ConEmu 140602 [Alpha]: ConEmu - developer build x86 and x64 versions. Written in C++, no additional packages required. Run "ConEmu.exe" or "ConEmu64.exe". Some useful information you may found: http://superuser.com/questions/tagged/conemu http://code.google.com/p/conemu-maximus5/wiki/ConEmuFAQ http://code.google.com/p/conemu-maximus5/wiki/TableOfContents If you want to use ConEmu in portable mode, just create empty "ConEmu.xml" file near to "ConEmu.exe" Tweetinvi a friendly Twitter C# API: Tweetinvi 0.9.3.x: Timelines- Added all the parameters available from the Timeline Endpoints in Tweetinvi. - This is available for HomeTimeline, UserTimeline, MentionsTimeline // Simple query var tweets = Timeline.GetHomeTimeline(); // Create a parameter for queries with specific parameters var timelineParameter = Timeline.CreateHomeTimelineRequestParameter(); timelineParameter.ExcludeReplies = true; timelineParameter.TrimUser = true; var tweets = Timeline.GetHomeTimeline(timelineParameter); Tweetinvi 0.9.3.1...Sandcastle Help File Builder: Help File Builder and Tools v2014.5.31.0: General InformationIMPORTANT: On some systems, the content of the ZIP file is blocked and the installer may fail to run. Before extracting it, right click on the ZIP file, select Properties, and click on the Unblock button if it is present in the lower right corner of the General tab in the properties dialog. This release completes removal of the branding transformations and implements the new VS2013 presentation style that utilizes the new lightweight website format. Several breaking cha...New Projects.NET Extended Framework: .NET Extended FrameworkActivity Diagram: This is an attempt to parse C# Operation source and convert them into UML Activity Diagrams. The development of a suitable diagram editor is the next priorityBango Payment Flow in-app payments: Bango Payment Flow in-app paymentsDeckEditor: ?????????????????????????????????。 ?????????、CSV????、???????????。demodjango: just a demo project to record how to using djangoExport Bugs: This application will export all the bugs in a current project from TFS. It also has the option to export all attachments in the current projectFantom - Expression Based Dynamic Language Manager: Easy Dynamic Language (over MSSQL) Management for Asp.Net Web Forms. Very easy create dynamic multi language Asp.Net web site.JIRAShell: Provides PowerShell cmdlets for working with JIRA.PipeUtil: PipeUtil is a library that simplifies use the feature PIPE windows. Has the capability of client and server with threads support.Post Deployment Smoke Tester: This tool enables you to easily carry out post deployment smoke tests against your installed deployments to determine if your environment is in a good state.Quan Ly Dang Ki Internet: quan ly dang ki internetToolKD: ToolKD console application designed to change the binary code for directories that are used KitchenDraw program. Wiki Parsing Service: A web service to Parse wiki mark-up to HTML and vice versaXBee-API for .NET: This is .NET library for communication with XBee/XBee-Pro series 1 (IEEE 802.15.4) and series 2 (ZB/ZigBee Pro) OEM RF Modules. XPinterest: XPinterestZSoft-CMS: the project is going to use a new approach other than regular modular cms es.

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  • How do I make my application startable from the terminal?

    - by Ralf Hersel
    I've created several Python applications wherefore I know how to create a DEB and how to push an application into my PPA in Launchpad. What I never found out is how to make the application startable from the terminal by just entering its name like you use to do with any other Linux application. I guess that I have to create a link to the application's shell script in /usr/bin/ but I don't know how to do this in my rules file which looks like this: #!/usr/bin/make -f # -*- makefile -*- %: dh $@ override_dh_install: dh_install nota/* /usr/share/nota/ dh_install applications/nota.desktop /usr/share/applications/

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  • Quick Question, robots.txt Disallow: /*/ does what exactly?

    - by Exit
    A SEO firm suggested changing the robots.txt to: User-agent: * Disallow: /*/ Allow: /ims/ I'm not sure what that would do, but my guess is that is would tell all robots to index nothing but the ims folder. I understand the wildcard, but I'm confused by the slashes and don't know how they would play out in conjunction with the wildcard. * Update * I didn't mention that there is a sitemap listed in the robots.txt file, but according to one tech blogger, he realized that sitemaps trump robots exclusions. So, even though this says in Google Webmaster Tools that everything with a trailing slash will not be indexed, the sitemap contains the important links. I did notice that the link count on Google went from 360 to 336, and the sitemap links under the URL scaled back to 3 from 6. I'm not sure the cause or what links were removed, though. Perhaps it cleaned out garbage. I'm still clueless why they would add in 'Allow: /ims/', that seems pointless. And a quick list of what would index according to the robots rules above (withouth the sitemap) using /*/: domain.com Indexed domain.com/page.html Indexed domain.com/folder/ Not Indexed domain.com/folder/page.html Not Indexed

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  • Develop 3d game for iphone & android in single code

    - by lajpat
    I have to make a 3d game on the lines of this app 3D Chess I want to make this app for both android & iphone by writing a single code. Of course little native code will be required to be done. I want to ensure that entire logic & animation code is written only once. What software does one suggest to achieve this since I am not a tight schedule. I came across Corona but I am not sure if such game can be made using it. Others I found Unity & Shiva. I am not experience in 3D game so please if someone can help Thanks Lajpat

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  • My website is infected, I restored a backup of the uninfected files, how long will it take to un-mark as dangerous?

    - by Cyclone
    My website www.sagamountain.com was recently infected by a malware distributor (or at least I think it may have been). I have removed all external content, google ads, firefly chat, etc. I uploaded a backup from a few weeks ago, when there was no issue. I patched the SQL injection hole. Now, how long will it take to unmark it as dangerous? Where can I contact google? I am not sure if this is the right place to post it, but since it may have been a server issue I may as well. Can sites inject base64 code via a virus on the whole server, or is it only via sql injection? Thanks for the help, viruses freak me out. Is there an online virus scanner that can scan my page and tell me what is wrong?

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  • Using Competition Information to Plan Your SEO Strategy

    There is no doubt about it, there is no better feeling than beating out your competition in search engine placement. It generally takes a certain length of time, but that day when you climb one step above your competition is a sweet victory. The easiest way to do this is to analyse just what exactly your competition is doing, and do it better.

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  • Bad Effects From Bad Neighbors

    There are websites who make use of ethical SEO but still don't reach the top positions of the search engine results. The main reason why this situation happens can be chosen from the three: sandbox effect, over optimization or bad neighborhood.

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  • Question about MochaHost.com Hosting Plans [duplicate]

    - by Wassim
    This question already has an answer here: How to find web hosting that meets my requirements? 5 answers This is not an advertising, I've just found this website (MochaHost) that offers a great things just for 3$/m like : 2 LifeTime FREE Domains UNLIMITED Space and bandwidth SVN (subversion) support SSH access PHP 5, Perl, Python, and Rails I need to know if any of you had taken from them a hosting plans, what do you think about it?

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  • Should a website be on a topic?

    - by Rana Prathap
    I run an online writers' community where authors publish their literature works and other members of the community read and comment on them. The authors write a wide variety of literature pieces(such as haikus, stories, poems, scientific articles, personal narratives) on a wide variety of topics(about sun and anything under it). My intention of providing the authors with search engine traffic is largely affected by the non existence of topical focus of the website(or so I think). Is there a way to overcome this problem?

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  • Free Cloud Mind Map Solution

    - by Zekta Chan
    As a Software Engineer we had a lot of discussion on SE design. Although we sync every document on the development process on Google Doc, mind map just didn’t fit in Google doc yet. The best we can do is to store a copy and share it online. To me, Mind map is an ir-replaceable piece of tools (yet) as agile note taking tools. And an eFormat is even greater than a paper one, due to the portability and extensibility. Does anyone have a good solution on “cloud-sharing” mind map? (We are using FreeMind at the moment) Thanks

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  • What is recommended minimum object size for gzip benefits?

    - by utt73
    I'm working on improving page speed display times, and one of the methods is to gzip content from the webserver. Google recommends: Note that gzipping is only beneficial for larger resources. Due to the overhead and latency of compression and decompression, you should only gzip files above a certain size threshold; we recommend a minimum range between 150 and 1000 bytes. Gzipping files below 150 bytes can actually make them larger. We serve our content through Akamai, using their network for a proxy and CDN. What they've told me: Following up on your question regarding what is the minimum size Akamai will compress the requested object when sending it to the end user: The minimum size is 860 bytes. My reply: What is the reason(s) for why Akamai's minimum size is 860 bytes? And why, for example, is this not the case for files Akamai serves for facebook? (see below) Google recommends to gzip more agressively. And that seems appropriate on our site where the most frequent hits, by far, are AJAX calls that are <860 bytes. Akamai's response: The reasons 860 bytes is the minimum size for compression is twofold: (1) The overhead of compressing an object under 860 bytes outweighs performance gain. (2) Objects under 860 bytes can be transmitted via a single packet anyway, so there isn't a compelling reason to compress them. So I'm here for some fact checking. Is the 860 byte limit due to packet size the end of this reasoning? Why would high traffic sites push this lower/closer to the 150 byte limit... just to save on bandwidth costs, or is there a performance gain in doing so?

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  • alias with parameters

    - by dustyprogrammer
    I was recently starting to setup my usual alias. I ended up needing to pass more information than my alias originally needed $ alias runserver = 'python manage.py runserver' $ runserver 80 // turns out you need sudo $ sudo runserver 80 $ sudo: runserver: command not found Now as I was writing this i realized maybe the alias isn't set for root. Could that be it? If not, could someone explain why this doesn't work. Please and thank you

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  • How to prevent duplication of content on a page with too many filters?

    - by Vikas Gulati
    I have a webpage where a user can search for items based on around 6 filters. Currently I have the page implemented with one filter as the base filter (part of the url that would get indexed) and other filters in the form of hash urls (which won't get indexed). This way the duplication is less. Something like this example.com/filter1value-items#by-filter3-filter3value-filter2-filter2value Now as you may see, only one filter is within the reach of the search engine while the rest are hashed. This way I could have 6 pages. Now the problem is I expect users to use two filters as well at times while searching. As per my analysis using the Google Keyword Analyzer there are a fare bit of users that might use two filters in conjunction while searching. So how should I go about it? Having all the filters as part of the url would simply explode the number of pages and sticking to the current way wouldn't let me target those users. I was thinking of going with at max 2 base filters and rest as part of the hash url. But the only thing stopping me is that it would lead to duplication of content as per Google Webmaster Tool's suggestions on Url Structure.

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  • Do you know a good html mailing list management software with admin levels?

    - by SirG
    I'm basically looking for a program/app/script (can be commercial) which I can ideally install on a windows server (we can run asp, asp.net php mssql) we have different groups of people who send newsletters to web members, I want to bring it all into one app which I can monitor and control. Ideally it would be able to create html newsletters, (with some templates) track emails and click throughs. Manage email lists subscribe/unsubscribes. And importantly have different levels of admin, so a newsletter creator could log in and create and send off an email, it goes into a queue where a communications editor can have an overview of all newsletters and approve the sending of the emails or edit them before they are sent off. before I start coding something up myself I thought I'd ask if anyone has any advice! Cheers!

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  • Upgarde from Asp.Net MVC 1 to MVC 2 - how to and issues with JsonRequestBehavior

    - by Renso
    Goal Upgrade your MVC 1 app to MVC 2 Issues You may get errors about your Json data being returned via a GET request violating security principles - we also address this here. This post is not intended to delve into why the Json GET request is or may be an issue, just how to resolve it as part of upgrading from MVC1 to 2. Solution First remove all references from your projects to the MVC 1 dll and replace it with the MVC 2 dll. Now update your web.config file in your web app root folder by simply changing references to assembly="System.Web.Mvc, Version 1.0.0.0 to Version 2.0.0.0, there are a couple of references in your config file, here are probably most of them you may have:         <compilation debug="true" defaultLanguage="c#">             <assemblies>                        <add assembly="System.Web.Mvc, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />             </assemblies>         </compilation>           <pages masterPageFile="~/Views/Masters/CRMTemplate.master" pageParserFilterType="System.Web.Mvc.ViewTypeParserFilter, System.Web.Mvc, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" pageBaseType="System.Web.Mvc.ViewPage, System.Web.Mvc, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" userControlBaseType="System.Web.Mvc.ViewUserControl, System.Web.Mvc, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" validateRequest="False">             <controls>                 <add assembly="System.Web.Mvc, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" namespace="System.Web.Mvc" tagPrefix="mvc" />   Secondly, if you return Json objects from an ajax call via the GET method you ahve several options to fix this depending on your situation: 1. The simplest, as in my case I did this for an internal web app, you may simply do:             return Json(myObject, JsonRequestBehavior.AllowGet);   2. In Mvc if you have a controller base you could wrap the Json method with:         public new JsonResult Json(object data)         {             return Json(data, "application/json", JsonRequestBehavior.AllowGet);                    }   3. The most work would be to decorate your Actions with:         [AcceptVerbs(HttpVerbs.Get)]   4. Another tnat is also a lot of work that needs to be done to every ajax call returning Json is:                             msg = $.ajax({ url: $('#ajaxGetSampleUrl').val(), dataType: 'json', type: 'POST', async: false, data: { name: theClass }, success: function(data, result) { if (!result) alert('Failure to retrieve the Sample Data.'); } }).responseText;   This should cover all the issues you may run into when upgrading. Let me kow if you run into any other ones.

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  • How to Enable User-Specific Wireless Networks in Windows 7

    - by The Geek
    Wireless network settings in Windows 7 are global across all users, but there’s a little-known option that lets you switch them to per-user, so each user has access to only the networks they are allowed to connect to. Here’s how it all works. How is this useful? Maybe you want to prevent a particular user from accessing the internet—if you don’t give them the wireless password, they won’t be able to get online. This could be very useful if you’ve got mini-people playing games on the family PC, but you don’t want them getting online Latest Features How-To Geek ETC How to Enable User-Specific Wireless Networks in Windows 7 How to Use Google Chrome as Your Default PDF Reader (the Easy Way) How To Remove People and Objects From Photographs In Photoshop Ask How-To Geek: How Can I Monitor My Bandwidth Usage? Internet Explorer 9 RC Now Available: Here’s the Most Interesting New Stuff Here’s a Super Simple Trick to Defeating Fake Anti-Virus Malware The Citroen GT – An Awesome Video Game Car Brought to Life [Video] Final Man vs. Machine Round of Jeopardy Unfolds; Watson Dominates Give Chromium-Based Browser Desktop Notifications a Native System Look in Ubuntu Chrome Time Track Is a Simple Task Time Tracker Google Sky Map Turns Your Android Phone into a Digital Telescope Walking Through a Seaside Village Wallpaper

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