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• SQL 2008 Mirroring, how to failover from the mirror database?

  - by Luis

  I have configured a database mirroring setup in SQL 2008 using the High-safety, Synchronous mode, without automatic failover. I don't have a Witness instance. Regarding high availability, I understand Mirroring is a better strategy than Log Shipping (faster and smoother failover), and cheaper than Clustering (because of license and hardware costs). According to the MS docs, to do the failover you need to access to the Principal database and in the "Mirror" options click the "Failover" button. But I want to do this from the Mirror database, because what would be the benefit as all this setup is being done in case the Principal server knocks down? Evidently I am missing something. If Mirroring is not a solution for server downtime (as would be Clustering, if I understand correctly), then which practical (i.e. real world examples) cases would benefit from Mirroring for high-availability purposes? Thank you very much for your response! I really need some enlightment.

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• Naming conventions: camelCase versus underscore_case ? what are your thoughts about it? [closed]

  - by poelinca

  I've been using underscore_case for about 2 years and I recently switched to camelCase because of the new job (been using the later one for about 2 months and I still think underscore_case is better suited for large projects where there are alot of programmers involved, mainly because the code is easier to read). Now everybody at work uses camelCase because (so they say) the code looks more elegant . What are you're thoughts about camelCase or underscore_case p.s. please excuse my bad english Edit Some update first: platform used is PHP (but I'm not expecting strict PHP platform related answers , anybody can share their thoughts on which would be the best to use , that's why I came here in the first place) I use camelCase just as everibody else in the team (just as most of you recomend) we use Zend Framework which also recommends camelCase Some examples (related to PHP) : Codeigniter framework recommends underscore_case , and honestly the code is easier to read . ZF recomends camelCase and I'm not the only one who thinks ZF code is a tad harder to follow through. So my question would be rephrased: Let's take a case where you have the platform Foo which doesn't recommend any naming conventions and it's the team leader's choice to pick one. You are that team leader, why would you pick camelCase or why underscore_case? p.s. thanks everybody for the prompt answers so far

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• IIS reveals internal IP address in content-location field - fix

  - by saille

  Referring: http://support.microsoft.com/kb/q218180/, there is a known issue in IIS4/5/6 whereby it will reveal the internal IP of a web server in the content-location field of the HTTP header. We have IIS 6. I have tried the fix suggested, but it has not worked. The website is configured to send all requests to ASP.NET, and I am wondering if this is why the fix, which addresses IIS configuration, has not worked for us. If this is the case, how would we fix this in ASP.NET? We need to fix this issue in order to pass a security audit.

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• Gre tunnel Linux Cisco

  - by mezgani

  I've created a GRE tunnel between LAN A and LAN B. LAN A is behind a router, and LAN B is behind a Linux box and this box has a pppoe interface. When i do tcpdump on Linux box i see that the traffic is routerd to Linux box (tunnel end), so my need is routing the tunnel traffic to internet. I've added these rules to my iptables script, and i stay unable to connect to internet from LAN A Permitting Linux to act as router (necessary to forward packets) echo "1" /proc/sys/net/ipv4/ip_forward iptables -A INPUT -p 47 -j ACCEPT iptables -A FORWARD -i ppp0 -j ACCEPT iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -t nat -A POSTROUTING -o gre0 -j MASEQUARADE What i've forgot to set in this case?

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• My Windows 8 computer does not come out of Standby

  - by Jikag

  My computer will not come out out of standby. It has had this issue ever since I bought it ~4 years ago. When I purchased it, It came with Vista, I have since upgraded it to 7 and now 8 Pro, each time hoping that it would fix the problem, each time finding that it did not. My computer is an HP Pavilion Model #: m9500y. The computer goes into standby, but does not come out of it properly. If Hybrid sleep in on, it does not respond at all. If Hybrid sleep is off, It comes out and I can see the desktop for a bit, but then the screen goes black again and I have to reboot. I have tried Running a sfc, and a chkdsk in case it's a corrupted file, but it hasn't helped. This isn't too serious an issue because I can just shutdown my computer and turn it on the old fashioned way, but it is annoying and I would appreciate some advice going forward as I'm currently stumped.

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• mpirun -np N, what if N is larger than my core number?

  - by Daniel

  Say I have a 4-core workstation, what would linux (Ubuntu) do if I execute mpirun -np 9 XXX Q1. Will 9 run immediately together, or they will run 4 after 4? Q2. I suppose that using 9 is not good, because the remainder 1, it will make the computer confused, (I don't know is it going to be confused at all, or the "head" of the computer will decide which core among the 4 cores will be used?) Or it will be randomly picked. Who decide which one core to call? Q3. If I feel my cpu is not bad and my ram is okay and large enough, and my case is not very big. Is it a good idea in order to fully use my cpu and ram, that I do mpirun -np 8 XXX, or even mpirun -np 12 XXX. Q4. Who decides all of these effciency optimization, Ubuntu, or linux, or motherboard or cpu? Your enlightenment would be really appreciated.

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• LINQ: Single vs. SingleOrDefault

  - by Paulo Morgado

  Like all other LINQ API methods that extract a scalar value from a sequence, Single has a companion SingleOrDefault. The documentation of SingleOrDefault states that it returns a single, specific element of a sequence of values, or a default value if no such element is found, although, in my opinion, it should state that it returns a single, specific element of a sequence of values, or a default value if no such element is found. Nevertheless, what this method does is return the default value of the source type if the sequence is empty or, like Single, throws an exception if the sequence has more than one element. I received several comments to my last post saying that SingleOrDefault could be used to avoid an exception. Well, it only “solves” half of the “problem”. If the sequence has more than one element, an exception will be thrown anyway. In the end, it all comes down to semantics and intent. If it is expected that the sequence may have none or one element, than SingleOrDefault should be used. If it’s not expect that the sequence is empty and the sequence is empty, than it’s an exceptional situation and an exception should be thrown right there. And, in that case, why not use Single instead? In my opinion, when a failure occurs, it’s best to fail fast and early than slow and late. Other methods in the LINQ API that use the same companion pattern are: ElementAt/ElementAtOrDefault, First/FirstOrDefault and Last/LastOrDefault.

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• the right way to do deployment with capistrano

  - by com

  I look for good practices for deploying with capistrano. I would like to start out with a short description how I used to do deployment. capistrano is installed locally on a developer's computer. I deploy thought gateway with capistrano option :gateway. Firstly, I thought that with :gateway option I need to have ssh connection only to gateway host, but it turns out that I need ssh connection (public key) to all hosts where I want to deploy to. I would like to find a convenient and secure way to deploy application. For example, in case when new developer starts working, is much more convinient to put his *public_key* only on gateway server and not on all applications servers. On the other hand I don't want him to have any connection to servers in particular ssh to gateway, just because he is developer, he needs to do only deployments. If you are aware of good practices for deploying with capistrano, please, let us know.

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• Disabling a touchpad in Windows

  - by Shamaoke

  I want to permanently disable a touchpad in Windows running on my laptop, since firstly, I use a mouse, and secondly, when I work, I often touch it accidentally what causes definite inconviniences. I tried the following approaches to disable it but with no result: Turned it off through BIOS — there's no such function there; Turned it off through the touchpad configuration utility — there's no such function there; Turned it off through the device manager — the disable button is inactive; Turned it off through a hotkey (Fn + F1 in my case) — the hotkey doesn't work; Uninstalled the proprietary driver — Windows automatically downloaded the standard driver; Uninstalled the standard driver and turned off the automatic driver download function (Win + R ? "systempropertiesadvanced" ? Hardware ? Device Installation Settings) — all the same, Windows downloaded and installed the driver. How can I disable a touchpad? Windows 7; the Alps touchpad.

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• Why class 'SQLiteDatabase' is not found in /var/www/*.php?

  - by Roman

  I am trying to use sqlite from PHP. I have the following simple code: <?php $db = new SQLiteDatabase("test2.sdb"); unset($db); ?> As the result of this code (which I execute in the command line "php test2.php") I get: Fatal error: Class 'SQLiteDatabase' not found in /var/www/test2.php on line 3 Does anybody know how can I make PHP able to use sqlite? P.S. Here I found out that "SQLite support is enabled by default on a standard Linux PHP compilation starting with PHP 5.0." And I have "PHP Version = 5.2.6-2ubuntu4.6". So, sqlite should be enabled unless the "--disable-sqlite". In my case output of "phpinfo();" does not contain "sqlite" at all.

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• Instructor Insight: Using the Container Database in Oracle Database 12 c

  - by Breanne Cooley

  The first time I examined the Oracle Database 12c architecture, I wasn’t quite sure what I thought about the Container Database (CDB). In the current release of the Oracle RDBMS, the administrator now has a choice of whether or not to employ a CDB. Bundling Databases Inside One Container In today’s IT industry, consolidation is a common challenge. With potentially hundreds of databases to manage and maintain, an administrator will require a great deal of time and resources to upgrade and patch software. Why not consider deploying a container database to streamline this activity? By “bundling” several databases together inside one container, in the form of a pluggable database, we can save on overhead process resources and CPU time. Furthermore, we can reduce the human effort required for periodically patching and maintaining the software. Minimizing Storage Most IT professionals understand the concept of storage, as in solid state or non-rotating. Let’s take one-to-many databases and “plug” them into ONE designated container database. We can minimize many redundant pieces that would otherwise require separate storage and architecture, as was the case in previous releases of the Oracle RDBMS. The data dictionary can be housed and shared in one CDB, with individual metadata content for each pluggable database. We also won’t need as many background processes either, thus reducing the overhead cost of the CPU resource. Improve Security Levels within Each Pluggable Database  We can now segregate the CDB-administrator role from that of the pluggable-database administrator as well, achieving improved security levels within each pluggable database and within the CDB. And if the administrator chooses to use the non-CDB architecture, everything is backwards compatible, too.  The bottom line: it's a good idea to at least consider using a CDB. -Christopher Andrews, Senior Principal Instructor, Oracle University

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• Switch HTTP Virtual Host to HTTPS Virtual Host

  - by Kumar

  We are using apache web server with RHEL 6.4. Currently we configured Name based virtual host on server. Enabled "Namebased Virtualhost *:80" and created /etc/httpd/conf.d/example-com.conf <VirtualHost *:80> ServerAdmin [email protected] DocumentRoot /var/www/vhost/example.com/public_html ServerName www.example.com ServerAlias example.com ErrorLog /var/log/httpd/vhosts/example-com-error_log CustomLog /var/log/httpd/vhosts/example-com-access_log common </VirtualHost> I've located my ssl certificates by /etc/httpd/conf.d/ssl.conf In this case how can I switch 80 site to 433 and also redirect all requests to 80 to 443

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• Generating Normal map from a Image with a given Albedo map

  - by snape

  I am working on a research problem part of which involves generating normal map from a given image of a rusted object. I searched the internet for techniques to achieve the above and apparently crazybump is mentioned a lot. I tried it but it didn't produce the desirable effects. Also I am looking for a method which draws inspiration from an existing research paper not some closed source software. I turned my attention to the technique described in the this paper. Results from this technique are satisfactory for normal objects because of bias in the training data but it doesn't work very well in the case of rusted objects. After this I focussed my attention on generating Albedo map (the above problem would become more solvable if Albedo map is obtained). Fortunately I am able to generate pretty good albedo maps for images of rusted objects. I used this paper's approach to generate Albedo maps. Now I want to know a good technique to get Normal map given an image and it's corresponding Albedo map. To give you an idea of what kind of images I am working with I am attaching a sample. Links to research material would be really appreciated. Thanks!

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• Connecting Small business network to Azure Site to Site VPN

  - by MarkKGreenway

  Would like to have connectivity between azure virtual machines and on LAN users. My current network has a Cisco ISA550 connected to the WAN (one Ethernet cable into the office the fiber transceiver is on a different floor)and any public servers can be one-to one NAT-ed to have a public and private IP. What is the best way to get a reliable connection. Between end users and the cloud? I want to know the preferred on site endpoint. Do the azure vm's have to have a local ip in the LAN subnet? (Right now 10.10.0.0/20 or 255.255.240.0 to give room if this is the case). If in purchased an asa550 would I put it behind or in front of the isa550. Would it be ahead or peer with the users switches? What is the best way to get a reliable connection. Between end users and the cloud servers?

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• Is there a webproxy via email?

  - by mafutrct

  This is probably a bit weird, and I don't think it exists yet. I'm basically asking for a program that, upon receiving a request via email, downloads a html page and sends it via email, possibly changing the links inside the page into outgoing emails to this program asking for another page. This is certainly one of the most crude ways of accessing the web, and obviously fails at anything beyond the most basic stuff. But it may still be useful to those that can send email, but can't access the web due to company policy or whatever reason. In the (likely) case this does not exist, I'd be interested to write such a proxy.

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• PHP 5.4 not available for windows + Apache?

  - by user410932

  I'd like to install the new PHP 5.4 on my Windows machine. I'm running Apache 2.2 on it. Reading the info on http://windows.php.net/download/, it says "If you are using PHP with Apache 1 or Apache2 from apache.org you need to use the VC6 versions of PHP". I guess I'm in that case, I just donloaded Apache from apache.org. However, there are no VC6 versions available of PHP 5.4, not even of PHP 5.3. How can I install PHP 5.4 on my Windows machine then ?

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• Excel 2010: if( , , "") not treated the same as blank for pivot table group by date

  - by Confused

  I'm trying to group by date in an Excel 2010 pivot table. The column with dates (i.e., the one want to group by), should be the latest date of 2 other columns if neither is null, or blank. i.e., with a formula like: =IF(AND(A4 <> "", B4 <> ""), MAX(A4,B4), "") Normally, this ""in the IF() formula acts the same as an empty cell. In this case, it is preventing me from grouping by date in the Pivot Table. If I filter the date column by (Blanks), then clear the contents of all those cells, then the pivot table does group by date ok. i.e., "" is not being treated the same as an empty cell.

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• OEPE with ADF binding support available: Total Eclipse

  - by Frank Nimphius

  The current release of Oracle Enterprise Pack for Eclipse, though in technology preview, brings Oracle ADF binding to the Eclipse IDE. You can download the Software from the link below: Oracle Enterprise Pack for Eclipse (12.1.1.1.0) Technical Preview New June 2012 Certified on Windows 7/XP/Vista, MacOS, and Linux. Supported on JDK 6. For many Eclipse users, ADF is new and therefore I expect them to need guidance and help in case they run into issues they don't know how to recover from. Similar, ADF users familiar with Oracle JDeveloper that want to give OEPE a try, will find things different in Eclipse and thus may have questions.  For both audiences I suggest to post issues to the OEPE forum on the Oracle Technology Network: I'll extend my OTN monitoring to include the OEPE forum on a daily basis to learn about developer needs, requirements and - of course - to catch bugs that need to be filed. From my side this is a part-time involvement, which means that the more ADF questions show on the forum, the more help I could need in answering them. The OTN forum for JDeveloper in my opnion wouldn't be the right place to go to unless the question is a generic ADF question that is not dependent on the integration in Eclipse. Here's the OEPE forum link for a start https://forums.oracle.com/forums/forum.jspa?forumID=578 Frank

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• Problem with WCF-SQL Adapter

  - by Paul Petrov

  When using WCF receive adapter with SQL binding in Polling mode please be aware of the following problem. Problem: At some regular but seemingly random intervals the application stops processing new requests, places a lock on the database and prevent other application from accessing it. Initially it looked like DTC issue, as it was distributed transaction that stalled most of the time. Symptoms: Orchestration instances in Dehydrated state, receive location not picking up new messages, exclusive locks on database tables, errors in DTC trace. Cause: Microsoft has confirmed that there is a bug in the WCF-SQL adapter. In the receive adapter binding configuration there's receiveTimeout property set to 10 minutes by default. If during this period data is not found in the table the adapter would start new thread and allocate more memory without releasing old resources. Thus if there's no new data in the table for a long time a new thread will be created in the host instance every 10 minutes until it reaches threshold (1000) and then there's no threads left for this host instance and it can't start/complete any tasks. Then this host instance won't be able to do anything. If other artifacts are hosted in the instance they will suffer consequences as well. Solution: - Set receiveTimeout to the maximum time 24.20:31:23.6470000. - Place WCF-SQL receive locations in separate host to provide its own thread pool and eliminate impact on other processes - Ensure WCF-SQL dedicated host instances are restarted at interval less or equal to receiveTimeout to flush threads and memory - Monitor performance counters Process/Thread Count/BTSNTSvc{n} for thread count trend and respond to alert if it grows by restarting host instance If you use WCF-SQL Adapter in the Notification mode then make sure to remove sqlAdapterInboundTransactionBehavior otherwise this location will exhibit the same issue. In this case though, setting receiveTimeout doesn't help and new thread will be created at default intervals (10 min) ignoring maximum setting.

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• OpenSSH SFTP server with chroot()

  - by HannesFostie

  I am currently setting up an SFTP server but there is one detail I can't seem to figure out. When I add a user, I would like him to connect using his client and be able to write in his "root dir" right away. My Match case for the SFTP-users group currently has ChrootDirectory set as "/home/%u", and inside that directory I have to have a subdirectory owned by the user, while /home/%u itself is owned by root. Next to that, the "root dir" also has a couple files, .bashrc to name one. Is it possible to put these files somewhere else, remove them, or at least make them invisible to the user? Thanks

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• Smart defaults [SSDT]

  - by jamiet

  I’ve just discovered a new, somewhat hidden, feature in SSDT that I didn’t know about and figured it would be worth highlighting here because I’ll bet not many others know it either; the feature is called Smart Defaults. It gets around the problem of adding a NOT NULLable column to an existing table that has got data in it – previous to SSDT you would need to define a DEFAULT constraint however it does feel rather cumbersome to create an object purely for the purpose of pushing through a deployment – that’s the situation that Smart Defaults is meant to alleviate. The Smart Defaults option exists in the advanced section of a Publish Profile file: The description of the setting is “Automatically provides a default value when updating a table that contains data with a column that does not allow null values”, in other words checking that option will cause SSDT to insert an arbitrary default value into your newly created NON NULLable column. In case you’re wondering how it does it, here’s how: SSDT creates a DEFAULT CONSTRAINT at the same time as the column is created and then immediately removes that constraint: ALTER TABLE [dbo].[T1]    ADD [C1] INT NOT NULL,         CONSTRAINT [SD_T1_1df7a5f76cf44bb593506d05ff9a1e2b] DEFAULT 0 FOR [C1];ALTER TABLE [dbo].[T1] DROP CONSTRAINT [SD_T1_1df7a5f76cf44bb593506d05ff9a1e2b]; You can then update the value as appropriate in a Post-Deployment script. Pretty cool! On the downside, you can only specify this option for the whole project, not for an individual table or even an individual column – I’m not sure that I’d want to turn this on for an entire project as it could hide problems that a failed deployment would highlight, in other words smart defaults could be seen to be “papering over the cracks”. If you think that should be improved go and vote (and leave a comment) at [SSDT] Allow us to specify Smart defaults per table or even per column. @Jamiet

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• IIS reveals internal IP address in content-location field

  - by saille

  Referring: http://support.microsoft.com/kb/q218180/, there is a known issue in IIS4/5/6 whereby it will reveal the internal IP of a web server in the content-location field of the HTTP header. We have IIS 6. I have tried the fix suggested, but it has not worked. The website is configured to send all requests to ASP.NET, and I am wondering if this is why the fix, which addresses IIS configuration, has not worked for us. If this is the case, how would we fix this in ASP.NET? We need to fix this issue in order to pass a security audit.

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• AABB Sweeping, algorithm to solve "stacking box" problem

  - by Ivo Wetzel

  I'm currently working on a simple AABB collision system and after some fiddling the sweeping of a single box vs. another and the calculation of the response velocity needed to push them apart works flawlessly. Now on to the new problem, imagine I'm having a stack of boxes which are falling towards a ground box which isn't moving: Each of these boxes has a vertical velocity for the "gravity" value, let's say this velocity is 5. Now, the result is that they all fall into each other: The reason is obvious, since all the boxes have a downward velocity of 5, this results in no collisions when calculating the relative velocity between the boxes during sweeping. Note: The red ground box here is static (always 0 velocity, can utilize spatial partitioning ), and all dynamic static collisions are resolved first, thus the fact that the boxes stop correctly at this ground box. So, this seems to be simply an issue with the order the boxes are sweept against each other. I imagine that sorting the boxes based on their x and y velocities and then sweeping these groups correctly against each other may resolve this issues. So, I'm looking for algorithms / examples on how to implement such a system. The code can be found here: https://github.com/BonsaiDen/aabb The two files which are of interest are [box/Dynamic.lua][3] and [box/Manager.lua][4]. The project is using Love2D in case you want to run it.

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• How to re-add a missing font

  - by WEFX

  I recently upgraded from Office 2007 to 2010, and that went fairly smoothly. However, afterwards, my Calibri font was gone, so my Word and Outlook started using the next available font in the list... Comic Sans! I browsed to Control Panel Fonts, and saw that there was no longer a Calibri listing. I know that one way to recover a missing font is to just copy the missing font files from another computer. In my case, the four files I needed were: calibri.ttf, //regular calibrib.ttf, //bold calibrii.ttf, //italics calibriz.ttf, //bold and italics However, once I attempted to copy-and-paste these files to my computer, I realized these files were already on my problem computer; they never really got erased. I don't know why they aren't working in Office, and they aren't listed in Control Panel Fonts.

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• rsync error: some files/attrs were not transferred

  - by Daniel Ball

  Using rsync(ubuntu) and a DeltaCopy server on W2K3 to back up some of the data on the file server before I migrate from W2K3 to Ubuntu server. After it completed I ran a dry run just in case something had been missed or changed ... I got the following: sudo rsync -az -n 198.3.9.25::Music /mnt/raid/music [sudo] password for daniel: file has vanished: "?????\#267????" (in Music) file has vanished: "????????" (in Music) ... rsync error: some files/attrs were not transferred (see previous errors) (code 23) at main.c(1526) [generator=3.0.7] I just want to make sure I'm reading it right, that somehow there are files on the receiving end that aren't on the sending?

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