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• SQL SERVER – Finding Size of a Columnstore Index Using DMVs

  - by pinaldave

  Columnstore Index is one of my favorite enhancement in SQL Server 2012. A columnstore index stores each column in a separate set of disk pages, rather than storing multiple rows per page as data traditionally has been stored. In case of the row store indexes multiple pages will contain multiple rows of the columns spanning across multiple pages. Whereas in case of column store indexes multiple pages will contain (multiple) single columns.  Columnstore Indexes are compressed by default and occupies much lesser space than regular row store index by default. One of the very common question I often see is need of the list of columnstore index along with their size and corresponding table name. I quickly re-wrote a script using DMVs sys.indexes and sys.dm_db_partition_stats. This script gives the size of the columnstore index on disk only. I am sure there will be advanced script to retrieve details related to components associated with the columnstore index. However, I believe following script is sufficient to start getting an idea of columnstore index size.  SELECT OBJECT_SCHEMA_NAME(i.OBJECT_ID) SchemaName, OBJECT_NAME(i.OBJECT_ID ) TableName, i.name IndexName, SUM(s.used_page_count) / 128.0 IndexSizeinMB FROM sys.indexes AS i INNER JOIN sys.dm_db_partition_stats AS S ON i.OBJECT_ID = S.OBJECT_ID AND I.index_id = S.index_id WHERE  i.type_desc = 'NONCLUSTERED COLUMNSTORE' GROUP BY i.OBJECT_ID, i.name Here is my introductory article written on SQL Server Fundamentals of Columnstore Index. Create a sample columnstore index based on the script described in the earlier article. It will give the following results. Please feel free to suggest improvement to script so I can further modify it to accommodate enhancements. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Index, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology Tagged: ColumnStore Index

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• Transient VO : Powerful J2EE Design Pattern

  - by Vijay Mohan

  We had a use-case wherein, the communication has to happen between regions residing under differenet taskfows. Essentially, they had a common set of parameters to be used. Initially, we resorted to the  use of pageFlowScope variables, but they are tightly coupled with the individual task flows. So, how the communication has to happen..?Some of the alternatives that we brainstormed into are - 1.usage of adf contextual event - This is a powerful feature indeed for such use-cases, but there is a considerable cost involved with it. So, before resorting to it, you have to make sure that you have good enough reason to use it.It actually does a server roundtrip and also the issue of an event and listening part to it is also something which requires your attention !!2.Use a transientVO with shared data control scope - with shared data control scope, the transient VO rows would be persistent across the task flows in your application. All you have to do is to create the attributes in the transientVO(prefereably with the same names - for the ease of conversion) and create some utility methods in VOImpl for creating row, updating row and deleting a row. You also have to make sure that the vo row is initialized per http request( this you can do in a bookmark method of your index.jspx - residing in adfc-config.xml), else the ui fields binded to the transient vo attributes won't render in UI.Hope, this helps and this should be a common use-case across apps.

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• How can I move along an angled collision at a constant speed?

  - by Raven Dreamer

  I have, for all intents and purposes, a Triangle class that objects in my scene can collide with (In actuality, the right side of a parallelogram). My collision detection and resolution code works fine for the purposes of preventing a gameobject from entering into the space of the Triangle, instead directing the movement along the edge. The trouble is, the maximum speed along the x and y axis is not equivalent in my game, and moving along the Y axis (up or down) should take twice as long as an equivalent distance along the X axis (left or right). Unfortunately, these speeds apply to the collision resolution too, and movement along the blue path above progresses twice as fast. What can I do in my collision resolution to make sure that the speedlimit for Y axis movement is obeyed in the latter case? Collision Resolution for this case below (vecInput and velocity are the position and velocity vectors of the game object): // y = mx+c lowY = 2*vecInput.x + parag.rightYIntercept ; ... else { // y = mx+c // vecInput.y = 2(x) + RightYIntercept // (vecInput.y - RightYIntercept) / 2 = x; //if velocity.Y (positive) greater than velocity.X (negative) //pushing from bottom, so push right. if(velocity.y > -1*velocity.x) { vecInput = new Vector2((vecInput.y - parag.rightYIntercept)/2, vecInput.y); Debug.Log("adjusted rightwards"); } else { vecInput = new Vector2( vecInput.x, lowY); Debug.Log("adjusted downwards"); } }

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• Apache 2 Symbolic link not allowed or link target not accessible

  - by djechelon

  While the title of this question matches an already asked question, in my case I already set Options +FollowSymLinks. The setup is the following: my hosting setup includes htdocs/ directory that is the default document root for HTTP websites and htdocs-secure that is for HTTPS. They are meant for sites that need a different HTTPS version. In case both share the same files I create a link from htdocs-secure to htdocs by ln -s htdocs htdocs-secure but here comes the problem! Log still says Symbolic link not allowed or link target not accessible: /path/to/htdocs-secure Vhost fragment Header always set Strict-Transport-Security "max-age=500" DocumentRoot /path/to/htdocs-secure <Directory "/path/to/htdocs-secure"> allow from all Options +FollowSymLinks </Directory> I think it's a correct setup. The HTTP version of the site is accessible, so it doesn't look like a permission problem. How to fix this? [Add] other info: I use MPM-itk and I set AssignUserId to the owner/group of both the directories

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• What's so difficult about SVN merges? [closed]

  - by Mason Wheeler

  Possible Duplicate: I’m a Subversion geek, why should I consider or not consider Mercurial or Git or any other DVCS? Every once in a while, you hear someone saying that distributed version control (Git, HG) is inherently better than centralized version control (like SVN) because merging is difficult and painful in SVN. The thing is, I've never had any trouble with merging in SVN, and since you only ever hear that claim being made by DVCS advocates, and not by actual SVN users, it tends to remind me of those obnoxious commercials on TV where they try to sell you something you don't need by having bumbling actors pretend that the thing you already have and works just fine is incredibly difficult to use. And the use case that's invariably brought up is re-merging a branch, which again reminds me of those strawman product advertisements; if you know what you're doing, you shouldn't (and shouldn't ever have to) re-merge a branch in the first place. (Of course it's difficult to do when you're doing something fundamentally wrong and silly!) So, discounting the ridiculous strawman use case, what is there in SVN merging that is inherently more difficult than merging in a DVCS system?

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• How to deal with colleagues refuse to follow practices?

  - by Adrian Shum

  I was discussing with another colleague about what we should be used when an DB entity is referring to another. I don't think there is any good reason to break the practice of putting the Primary Key in the referring entity. However, one of my colleague says: "You should use a surrogate key in the entity, but it is better to put the human-readable natural key in the referring entity. As long it is unique, it is fine and it is easier when you are doing support or maintenance job" I know it will works, but obviously it is not a good practice you are putting a non-PK unique column as "foreign key", just for gaining a bit of ease in writing SQL during support as we can have less table join. Though I mentioned the his approach is conceptual incorrect, and causing problem too practically etc, he seems rather trade off correctness in data model in exchange of ease of maintenance. And he said: "I know it is not good practice, but good practice is not golden rule" Honestly I feel frustrated when dealing with something like this. I know there are always case that we should break some rule or practice, but doubtless it is not such case now. What will you when you are facing situation like this? Please assume yourself being a senior developer which is expected to contribute in misc development direction and convention.

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• Why does bash invocation differ on AIX when using telnet vs ssh

  - by Philbert

  I am using an AIX 5.3 server with a .bashrc file set up to echo "Executing bashrc." When I log in to the server using ssh and run: bash -c ls I get: Executing bashrc . .. etc.... However, when I log in with telnet as the same user and run the same command I get: . .. etc.... Clearly in the telnet case, the .bashrc was not invoked. As near as I can tell this is the correct behaviour given that the shell is non-interactive in both cases (it is invoked with -c). However, the ssh case seems to be invoking the shell as interactive. It does not appear to be invoking the .profile, so it is not creating a login shell. I cannot see anything obviously different between the environments in the two cases. What could be causing the difference in bash behaviour?

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• Email notification and mail server

  - by Jerr Wu

  I am building a web application with email notification just like Facebook, which will host in http://www.linode.com/. When a user A comment to a post, the poster will get an email notification from '[email protected]' with the comment message written by user A. (Not spam) I really like Google Apps but they have sending limits 2000 sending per day, that is not suit for my case becuz I cannot have sending limits. There will be many email notifications. http://support.google.com/a/bin/answer.py?hl=en&answer=166852 I also need company email accounts for team members use which I prefer Google Apps. My web application will host in linode, I am considering "Amazon Simple Notification Service" for the email notification. My questions are Any other recommend email service provider suits my case for me? Can I bind company email accounts(ex: [email protected]) with Google Apps and bind [email protected] with other email service provider?

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• OWB/ODI Users: Last Chance to Submit and Vote On Sessions for OpenWorld 2010

  - by antonio romero

  Now is the last chance for OWB and ODI users to propose new ETL/DW/DI sessions for OpenWorld! Oracle OpenWorld 2010 "Suggest a Session" lets members of the Oracle Mix community submit and vote on papers/talks for OpenWorld. The most popular session proposals will be included in the conference program. One promising OWB-related topic has already been submitted: Case Study: Real-Time Data Warehousing and Fraud Detection with Oracle 11gR2 Dr. Holger Friedrich and consultants from sumIT AG in Switzerland built a real-time data warehouse and accompanying BI system for real-time online fraud detection with very limited resources and a short schedule. His presentation will cover: How sumIT AG efficiently loads complex data feeds in real time in Oracle 11gR2 using, among others, Advanced Queues and XML DB How they lowered costs and sped up development, by leveraging the DBs development features including Oracle Warehouse Builder How they delivered a production-ready solution in a few short months using only three part-time developers Come vote for this proposal, on Oracle Mix: https://mix.oracle.com/oow10/proposals/10566-case-study-real-time-data-warehousing-and-fraud-detection-with-oracle-11gr2  I have already invited members of the OWB/ODI Linkedin group (with over 1400 members) to come vote on topics like this one and propose their own. If enough of us vote on a few topics, we are sure to get some on the agenda!  And if you have your own topics, using the Suggest-a-Session instructions here: http://wiki.oracle.com/page/Oracle+OpenWorld+2010+Suggest-a-Session If you propose a topic, don't forget to come to Linkedin and promote it! I have already sent the members of the Linkedin group an email announcement about this, and I will send another in a week, with links to all topics submitted. Thanks, all!

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• Permission based Authorization vs. Role based Authorization - Best Practices - 11g

  - by Prakash Yamuna

  In previous blog posts here and here I have alluded to the support in OWSM for Permission based authorization and Role based authorization support. Recently I was having a conversation with an internal team in Oracle looking to use OWSM for their Web Services security needs and one of the topics was around - When to use permission based authorization vs. role based authorization? As in most scenarios the answer is it depends! There are trade-offs involved in using the two approaches and you need to understand the trade-offs and you need to understand which trade-offs are better for your scenario. Role based Authorization: Simple to use. Just create a new custom OWSM policy and specify the role in the policy (using EM Fusion Middleware Control). Inconsistent if you have multiple type of resources in an application (ex: EJBs, Web Apps, Web Services) - ex: the model for securing EJBs with roles or the model for securing Web App roles - is inconsistent. Since the model is inconsistent, tooling is also fairly inconsistent. Achieving this use-case using JDeveloper is slightly complex - since JDeveloper does not directly support creating OWSM custom policies. Permission based Authorization: More complex. You need to attach both an OWSM policy and create OPSS Permission authorization policies. (Note: OWSM leverages OPSS Permission based Authorization support). More appropriate if you have multiple type of resources in an application (ex: EJBs, Web Apps, Web Services) and want a consistent authorization model. Consistent Tooling for managing authorization across different resources (ex: EM Fusion Middleware Control). Better Lifecycle support in terms of T2P, etc. Achieving this use-case using JDeveloper is slightly complex - since JDeveloper does not directly support creating/editing OPSS Permission based authorization policies.

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• How can I move a polygon edge 1 unit away from the center?

  - by Stephen

  Let's say I have a polygon class that is represented by a list of vector classes as vertices, like so: var Vector = function(x, y) { this.x = x; this.y = y; }, Polygon = function(vectors) { this.vertices = vectors; }; Now I make a polygon (in this case, a square) like so: var poly = new Polygon([ new Vector(2, 2), new Vector(5, 2), new Vector(5, 5), new Vector(2, 5) ]); So, the top edge would be [poly.vertices[0], poly.vertices[1]]. I need to stretch this polygon by moving each edge away from the center of the polygon by one unit, along that edge's normal. The following example shows the first edge, the top, moved one unit up: The final polygon should look like this new one: var finalPoly = new Polygon([ new Vector(1, 1), new Vector(6, 1), new Vector(6, 6), new Vector(1, 6) ]); It is important that I iterate, moving one edge at a time, because I will be doing some collision tests after moving each edge. Here is what I tried so far (simplified for clarity), which fails triumphantly: for(var i = 0; i < vertices.length; i++) { var a = vertices[i], b = vertices[i + 1] || vertices[0]; // in case of final vertex var ax = a.x, ay = a.y, bx = b.x, by = b.y; // get some new perpendicular vectors var a2 = new Vector(-ay, ax), b2 = new Vector(-by, bx); // make into unit vectors a2.convertToUnitVector(); b2.convertToUnitVector(); // add the new vectors to the original ones a.add(a2); b.add(b2); // the rest of the code, collision tests, etc. } This makes my polygon start slowly rotating and sliding to the left, instead of what I need. Finally, the example shows a square, but the polygons in question could be anything. They will always be convex, and always with vertices in clockwise order.

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• optimizing file share performance on Win2k8?

  - by Kirk Marple

  We have a case where we're accessing a RAID array (drive E:) on a Windows Server 2008 SP2 x86 box. (Recently installed, nothing other than SQL Server 2005 on the server.) In one scenario, when directly accessing it (E:\folder\file.xxx) we get 45MBps throughput to a video file. If we access the same file on the same array, but through UNC path (\server\folder\file.xxx) we get about 23MBps throughput with the exact same test. Obviously the second test is going through more layers of the stack, but that's a major performance hit. What tuning should we be looking at for making the UNC path be closer in performance to the direct access case? Thanks, Kirk (corrected: it is CIFS not SMB, but generalized title to 'file share'.) (additional info: this happens during the read from a single file, not an issue across multiple connections. the file is on the local machine, but exposed via file share. so client and file server are both same Windows 2008 server.)

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• need explanation on amortization in algorithm

  - by Pradeep

  I am a learning algorithm analysis and came across a analysis tool for understanding the running time of an algorithm with widely varying performance which is called as amortization. The autor quotes " An array with upper bound of n elements, with a fixed bound N, on it size. Operation clear takes O(n) time, since we should dereference all the elements in the array in order to really empty it. " The above statement is clear and valid. Now consider the next content: "Now consider a series of n operations on an initially empty array. if we take the worst case viewpoint, the running time is O(n^2), since the worst case of a sigle clear operation in the series is O(n) and there may be as many as O(n) clear operations in the series." From the above statement how is the time complexity O(n^2)? I did not understand the logic behind it. if 'n' operations are performed how is it O(n ^2)? Please explain what the autor is trying to convey..

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• Variable naming conventions?

  - by Ziv

  I've just started using ReSharper (for C#) and I kind of like its code smells finder, it shows me some things about my writing that I meant to fix a long time ago (mainly variable naming conventions). It caused me to reconsider some of my naming conventions for methods and instance variables. ReSharper suggests that instance variable be lower camel case and begin with an underscore. For a while I meant to make all my local variables lower camel case but is the underscore necessary? Do you find it comfortable? I don't like this convention but I also haven't tried it yet, what is you opinion of it? The second thing it prompted me to re-evaluate is my naming conventions for GUI event handlers. I usually use the VS standard of ControlName_Action and my controls usually use hungarian notation (as a suffix, to help clarify in code what is visible to the user and what isn't when dealing with similarly named variable) so I end up with OK_btn_Click(), what is your opinion of that? Should I succumb to the ReSharper convention or there are other equally valid options?

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• Installing Windows 8 over Windows 7 with Ubuntu installed using wubi (both on `C:\`)

  - by peat-ar

  Current state I'm using both - Ubuntu (installed via Wubi on the same drive as Windows) and Windows 7 - quite frequently. I just bought the upgrade to Windows 8 and was curious to try it out, however I'm quite insecure whether Windows 8's "secure boot" will exclude my current Ubuntu installation and if it's even possible to keep it. So... is there any way to upgrade to Windows 8 without overwriting Ubuntu? (I really don't want to reinstall it, as a lot of customization has been done here and taking backups and all would get pretty wearing (same case for Windows 7 - if possible, I'd like to keep my files)) This is not a dublicate of Installing Windows 8 over Windows 7 with Ubuntu installed using wubi? because this question only deals with the case when Ubuntu has been installed on (e.g.) D:\ (while Windows is being installed on C:\)

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• If-Modified-Since vs If-None-Match

  - by Roger

  This question is based on this article response header HTTP/1.1 200 OK Last-Modified: Tue, 12 Dec 2006 03:03:59 GMT ETag: "10c24bc-4ab-457e1c1f" Content-Length: 12195 request header GET /i/yahoo.gif HTTP/1.1 Host: us.yimg.com If-Modified-Since: Tue, 12 Dec 2006 03:03:59 GMT If-None-Match: "10c24bc-4ab-457e1c1f" HTTP/1.1 304 Not Modified In this case browser is sending both If-None-Match and If-Modified-Since. My question is on the server side do I need to match BOTH etag and If-Modified-Since before I send 304. Or Should I just look at etag and send 304 if etag is a match. In this case I am ignoring If-Modified-Since .

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• Big project layout : adding new feature on multiple sub-projects

  - by Shiplu

  I want to know how to manage a big project with many components with version control management system. In my current project there are 4 major parts. Web Server Admin console Platform. The web and server part uses 2 libraries that I wrote. In total there are 5 git repositories and 1 mercurial repository. The project build script is in Platform repository. It automates the whole building process. The problem is when I add a new feature that affects multiple components I have to create branch for each of the affected repo. Implement the feature. Merge it back. My gut feeling is "something is wrong". So should I create a single repo and put all the components there? I think branching will be easier in that case. Or I just do what I am doing right now. In that case how do I solve this problem of creating branch on each repository?

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• Outlook attachment save prompt behavior

  - by kara-marfia

  It seems they've put some Clippy-like behavior into Outlook 07. Assume you open an email message and open its attachment, given that you make no changes to the message or the attachment. If you close the attachment, then close the email - works as expected Close email - prompted to save changes to attachment I have some clerical users, and they tend to believe what the computer tells them. In this case, I'm having a hard time determining the reason someone determined that Outlook should lie in this case, and prompt someone to save a file that hasn't changed. Regardless, I've only been able to find examples of people failing to find a fix for this. Anyone have ideas? edit: I should have clarified, I suppose I'm looking for a workarounnd, as it's consistently reproduceable for any machine, and I suspect is therefore "working as intended"

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• Are More Comments Better in High-Turnover Environments?

  - by joshin4colours

  I was talking with a colleague today. We work on code for two different projects. In my case, I'm the only person working on my code; in her case, multiple people work on the same codebase, including co-op students who come and go fairly regularly (between every 8-12 months). She said that she is liberal with her comments, putting them all over the place. Her reasoning is that it helps her remember where things are and what things do since much of the code wasn't written by her and could be changed by someone other than her. Meanwhile, I try to minimize the comments in my code, putting them in only in places with a unobvious workaround or bug. However, I have a better understanding of my code overall, and have more direct control over it. My opinion in that comments should be minimal and the code should tell most of the story, but her reasoning makes sense too. Are there any flaws in her reasoning? It may clutter the code but it ultimately could be quite helpful if there are many people working on it in the short- to medium-run.

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• Oracle at Work videó: Banca Transilvania, Exadata és Exalogic, alkalmazások és adattárház

  - by user645740

  Az ORACLE AT WORK videók sorában most a Banca Transilvania romániai bank felso vezetoi osztják meg gyakorlati tapasztalataikat az Exadata Database Machine és az Exalogic megoldások banki muködésérol. Videó link: Video Case Study with Banca Transilvania.    A kolozsvári székhelyu Banca Transilvania a harmadik legnagyobb bank Romániában, 1,5 millió aktív ügyfelet kezel, a bank növekszik. Amikor 1999-ben megjelent a II. generációs Exadata V2-es sorozat, ebbol a Banca Transilvania volt az elso banki vásárló a világon. Eloször az adattárházukat helyezték át Exadatára, hatalmas teljesítmény ugrást tapasztaltak, amit az üzlet ki is tudott használni, több riport, extrém jó válaszidokkel, gyorsabb batch futások. A cél a banki architektúra Exadata és Exalogic rendszerre történo konszolidálása. A videóban az Exadata + Exalogic megoldásuk elonyeirol a Banca Transilvania vezetoi beszélnek: Robert C. Rekkers, CEO;  Leontin Toderici, COO;  Marius Ursuti, IT Director. az alkalmazásaikat Oracle-ön konszolidálják kártya rendszer új core-banking rendszer: FLEXCUBE is az Exadatán fog muködni, ez segíti a bankot a növekedésben, a növekvo ügyfélszám, tranzakciók kezelésében Siebel CRM tesztelik az Exa architektúrán az Oracle E-Business Suite alkalmazásokat is legjobb teljesítmény Oracle adatbázisokra, kisebb válaszidok, adattárház és Oracle OLAP: költségcsökkenés, 30-szor gyorsabb muködés Exalogic: alkalmazásszerverek konszolidációja WebLogic szerveren a bank tesztjei is azt mutatják, hogy az Exalogic elonyei még jobban kidomborodnak az Exadata használatával együtt a gépek beállítását követoen 24 órán belül már kezdhetik a munkát, az elore telepített szoftverekkel, a gyárilag alaposan tesztelt és hangolt gépekkel egyszerubb architektúra, ennek menedzsmentje is kisebb költségu általánosan minden rendszer bevezetési ideje lecsökken az Exa architektúrán lehetové teszi új termékek és szolgáltatások gyorsabb bevezetését költségcsökkentés, teljes költség, Total Cost csökkent kiemelték az Oracle Corporation  felkészült csapatának rugalmasságát az Oracle folyamatos fejlesztése, innovációja, supportja Videó link: Video Case Study with Banca Transilvania.

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• Is data on RAM memory recoverable?

  - by Ehsan Mamakani

  Imagine you're working on your computer and suddenly the electricity goes out is there a way to recover the data lost in this case?

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• Windows 2003 shutdown instead of reboot

  - by The_cobra666

  Hi all, I've got a very strange problem. On the net I can only find problems with Server 2003 pc's, that reboot instead of shutting down, but in my case... (go figure) it does the opposite. When I choose to reboot, the system shutdown. Yes I am sure I used the reboot button. It happens via start == reboot and it happens when clicking on the reboot button when the update's have been installed. Nothing changed to the system's hardware. Only update's have been installed on the system. I did notice something odd in the logs when rebooting: Description: Timed out sending notification of target device change to window of "C:\WINDOWS\Explorer.EXE" KB: http://support.microsoft.com/kb/924390 They talk about a removable drive, but in my case, it's explorer.exe :s it appears 4 times. OS: Windows Server 2003 R2. Services: AD, DNS, DHCP, WSUS. Thanks in advance! Greetings from Belgium Shane

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• SMTP host name vs. domain in "From:" address vis-a-vis Email Deliverability

  - by Jared Duncan

  I'm trying to implement (or make sure that I'm correctly following) email sending best practices to improve deliverability, but the role of the smtp server's host name vs the domain name of the From: email address seems to be unclear, even after reading dozens of people's articles/input. Specifically, I understand that to satisfy the reverse DNS check, there must be a PTR record for the IP address of the sending machine that yields a domain name that matches the host name of the sending machine / SMTP server. Some say it needs to match the one given by the "hostname" command, most say it's the one provided with the HELO / EHLO statement, and this guy even says they MUST be the same (according to / enforced by what, I don't know; that's only a minor point of confusion, anyhow). First, what I can't find anywhere is whether or not the domain name of the From: email address needs to match the domain name of the SMTP server. So in my case, I have a VPS with linode. It primarily hosts a particular domain of mine, example.com, but I also sometimes do work on other projects: foo.com and bar.com. So what I'm wondering is if I can just leave the default linode PTR record (which resolves to abc.def.linode.com), make sure that abc.def.linode.com is what my mail server (qmail) is configured to say at HELO, and then proceed to use it to send out emails for example.com, foo.com, et al. If so, then I am confused by the advice given here, specifically (in a listing of bad case scenarios): No SPF record for the domain being used in the HELO command Why would THAT domain need an SPF record? And if it does, which domain should it provide whitelisting for: the HELO domain, or the domain of the From: email address (envelope sender)? Also, which domain would need to accept mail sent to [email protected]? If the domains must be the same, that would seem rather limiting to me, because then for every domain you wanted to send email from, you'd have to get another IP address for it. It would also compromise or ruin one's ability to do non-email sending things (e.g. wget) relatively anonymously. However, the upside--if this is the case--is that it would make for a far less confusing setup. I'm currently using the linode.com SMTP+PTR domain and example.com From: address combination without much of any deliverability issue, but my volume is very low and I'd like to know if someone out there has experience with larger volumes and has specifically tested the difference and/or has inside knowledge and/or has an authoritative answer (and source) for this particular question. I'm happy to clarify anything, let me know. Thanks in advance.

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• Pattern for Accessing MySQL connection

  - by Dipan Mehta

  We have an application which is C++ trying to access MySQL database. There are several (about 5 or so) threads in the application (with Boost library for threading) and in each thread has a few objects, each of which is trying to access Database for its' own purpose. It has a simple ORM kind of model but that really is not an important factor here. There are three potential access patterns i can think of: There could be single connection object per application or thread and is shared between all (or group). The object needs to be thread safe and there will be contentions but MySQL will not be fired with too many connections. Every object could initiate connection on its own. The database needs to take care of concurrency (which i think MySQL can) and the design could be much simpler. There could be two possibilities here. a. either object keeps a persistent connection for its life OR b. object initiate connection as and when needed. To simplify the contention as in case of 1 and not to create too many sockets as in case of 2, we can have group/set based connections. So there could be there could be more than one connection (say N), each of this connection could be shared connection across M objects. Naturally, each of the pattern has different resource cost and would work under different constraints and objectives. What criteria should i use to choose the pattern of this for my own application? What are some of the advantages and disadvantages of each of these pattern over the other? Are there any other pattern which is better? PS: I have been through these questions: mysql, one connection vs multiple and MySQL with mutiple threads and processes But they don't quite answer exactly what i am trying to ask.

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• Inserting HTML code with jquery

  - by J. Robertson

  One of our web applications is a page that takes in a serial number and various information is returned and displayed to the user. The serial is passed via AJAX, and based on the response, one of the following can happen - An error message is shown A new form replaces the previous form Now, the way I am handling this is to use jQuery to destroy (using $.remove()) the table that displayed the initial serial form, then I'm appending another html table that contains another form. Right now I am including that additional form as part of the html source, and just setting it to display:none, then using jQuery to show it when appropriate. However, I don't like this approach because if someone views source on the page, they can see that table html code that is not being displayed. My next thought would be to use AJAX to read in another HTML file, and append it that way. However, I am trying to keep down the number of files this project uses, and since most pages in our project will use AJAX, I could see a case where there are multiple files containing HTML snippets - and that feels sloppy to me. What is the best way to handle a case where multiple html elements are being shown and removed with jQuery?

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