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• Using Spotlight as the "database" of an application

  - by vicvicvic

  I'm developing an OS X application to organize "things" (as iTunes is to music and iPhoto to photos). Instead of having my own database and index, I'm considering using Spotlight to essentially serve this purpose. Has anyone tried this? Is it wise? The main benefit, as I see it, would be simplicity and avoiding redundancy. It seems a bit wasteful to implement my own index machinery when OS X comes with one built in. I have little experience working with Spotlight, however. From a user's perspective, I do know that it has been slow and imprecise in older versions of OS X. I also have a gut-feeling that since it's aimed at searching the whole filesystem, using it for "local" purposes becomes hackish. Obviously, my applications's index needs to constantly be up-to-date. Can mdimport be used for this?

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• Best way to handle SQL Server fulltext index updates

  - by tlianza

  Hi all, I have a fulltext index which doesn't need to be immediately up-to-date, I'd like to spare myself the I/O (when I do bulk updates, I see a ton of I/O related to the index) and do the index updates during low usage times (nightly, perhaps even weekly). It seems there are two ways to go about this: Turn off change tracking (SET CHANGE_TRACKING OFF) and add a timestamp field to the indexed table, so that you can run alter fulltext index on <table> start INCREMENTAL population, or Enable change tracking, but set it to MANUAL, so that you can run alter fulltext index on <table> start UPDATE population when you need it updated. Is there a preferred method? I couldn't tell from this overview if there was a performance benefit one way or the other. Tom

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• What is the point in using a "real" database modeling tool?

  - by cdeszaq

  We currently have a 10 year old nasty, spaghetti-code-style SQL Server database that we are soon looking to pretty much re-write from scratch as part of a re-write to a large web application. (The existing application will serve as the functional requirements for the next incarnation of the app). Some have suggested we use Visio to do all the diagramming and to generate the DDL, but others have suggested we use a dedicated database design tool, rather than a diagramming tool that is able to export DDL. Is there any benefit to using "real" DB design tools, such as ModelRight, over general tools like Visio? If so, what are those specific benefits? Edit: In a nutshell, what can real/dedicated tools do that something like Visio can't, and how much do these capabilities matter (from a best-practices standpoint, for example)

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• Is testability alone justification for dependency injection?

  - by fearofawhackplanet

  The advantages of DI, as far as I am aware, are: Reduced Dependencies More Reusable Code More Testable Code More Readable Code Say I have a repository, OrderRepository, which acts as a repository for an Order object generated through a Linq to Sql dbml. I can't make my orders repository generic as it performs mapping between the Linq Order entity and my own Order POCO domain class. Since the OrderRepository by necessity is dependent on a specific Linq to Sql DataContext, parameter passing of the DataContext can't really be said to make the code reuseable or reduce dependencies in any meaningful way. It also makes the code harder to read, as to instantiate the repository I now need to write new OrdersRepository(new MyLinqDataContext()) which additionally is contrary to the main purpose of the repository, that being to abstract/hide the existence of the DataContext from consuming code. So in general I think this would be a pretty horrible design, but it would give the benefit of facilitating unit testing. Is this enough justification? Or is there a third way? I'd be very interested in hearing opinions.

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• Silverlight vs ASP.NET for Business?

  - by Sahat

  Which of these two technologies has bigger demand today? I have plenty of free time this summer so I was thinking of learning either ASP.NET or Silverlight 4, and get an internship this coming Fall. If you've read my other question here on SO "Financial Market Developer Dilemma" then you already know that I am planning to work in the financial industry a few years from now. So my questions are: Which technology would benefit me more in the long term: Silverlight or ASP.NET? Which one pays more $$$? Which one has higher demand? What is the learning curve like for ASP.NET and Silverlight? Thanks in advance!

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• Are there any small scale, durable document/object databases?

  - by Joe Doyle

  I have a few .Net projects that would benefit from using a document/object database opposed to a relational one. I think that db4o would be a good choice, but we're not sure how much the cost is. I'd love to use MongoDB but it's design isn't for small scale, single server applications. Are there other options out there that I just haven't run across for small scale applications? EDIT: So is this a space that doesn't have a good solution, yet? Are there no small scale & durable document databases? Would my best choice be to use MongoDB and set the --syncdelay option set to 1?

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• Backup Client/Server Software that Syncs only the Delta?

  - by Urda

  I have a co-located server, and a desktop computer. I push small things and large ammounts of small files (like my iTunes) into a JungleDisk cloud. If a few files change there, no big deal, the file gets re-uped. For larger files JungleDisk backup isn't helpful. Things like movies and VMware images that change a lot, but I want backed up. Just not to JungleDisk since that would cost me even more money. I am looking for a product, closed or open source (preferably open source) that will sync the change, or delta, to my personal server on a schedule. That way I can keep a copy of my larger things, without paying JungleDisk a ton more since they are in the range of many Gigabytes. Right now these few items are backed up over FTP, and take forever. Both the client and server are windows environments.

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• What virtual machine software for fail-over and snapshots?

  - by consolibyte

  We're looking to virtualize a few machines with the hope that we can: a) Take "snapshots" of a machine to use as backups b) Implement a system where if the software/hardware fails, we can quickly and easily load up an recent snapshot on new hardware and replace the failed machine with a new one. As always, cost is a concern- there's only 3 or 4 servers we're going to do this with, so we don't want to drop $50,000 on this. I'm confused by all of the different virtual machine offerings. Which one is does what I want, and does it easily?

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• Are there pitfalls to using incompatible RAM (frequencies) in motherboards?

  - by osij2is

  I'd like to use 2 x 4GB DDR3 1600 dimms in a motherboard capable of only DDR3 1066. The DDR3 1600 is on sale and the cost is identical to 1066 dimms. It'd be nice to have these faster sticks around should i upgrade the motherboard. I assume the RAM can under clock itself or be changed in the BIOS. While obviously it's less than ideal situation, I don't know if there are other unintended consequences in terms of stability, performance and longevity of the board and said RAM. Am I doing any damage to the memory controller or RAM? I've always bought RAM at the max speed specified for the motherboard and I've never gone over so I'm not sure if there any caveats to this at all. Edit: I intend to use the RAM in pairs. I know that mixing RAM speeds is just a bad idea.

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• Hosts that allow email marketing?

  - by Ghost1227

  I work for a company that heavily relies on email marketing to make money and we're running into a problem. We are trying to spin up a new email server and are finding it difficult to find a hosting company that doesn't explicitly disallow any form of mass mailing, legitimate or otherwise! Our lists are all opt-in, so the legitimacy issues aren't a problem, and we comply 100% with CAN-SPAM laws, but that doesn't seem to matter to hosting companies. Does anyone else have experience in this market? Can anyone suggest hosting companies that either support ESPs or are at least mass-mailing friendly? I've done lookups on most of the big players in the field and it seems that all of them are hosting their own equipment, which is currently cost prohibitive for us.

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• Using WebSphere CloudBurst with PowerVM to AIX virtualization over a cloud

  - by ADD Geek

  hi there we are studying the virtualization option to reduce our datacenter cost, and this research was assigned to me. we looked into alternatives and we almost reached a conclusion that PowerVM is the only option to virtualize pSeries servers. we found no signs of cloud support explicitly mentioned in any document, however there was the mention of CloudBurst. from the videos we watched and the documents we read, it seems that CloudBurst is more oriented towards Application Servers (WebSphere Software). but our environment is not relying only on WebSphere. we have some banking applications, Oracle Databases and MQ/Broaker. the question is: 1- can we virtualize the existing applications (all running AIX) on a cloud running on top of some of the existing servers? (given that we do the sizing properly) 2- is PowerVM to run on top of CloudBurst? 3- if the above solution is applicable, is this some sort of HA solution (since the VM will run on top of multiple physical boxes, while the same physical box will run multiple live images) thanks for your help

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• Dell Vostro 1520 Unable to Read Compact Flash Card with Adapter?

  - by Jim Taylor

  I Purchased the Dell Vostro 1520 a few months ago and recently tried using a PCMCIA adapter for the Compact Flash card my camera uses. I can't get the laptop to find the card. Tried going online to see if a CF card should work, but have not found a clear or definate answer. I do not want to deal with Dell on the phone as even 800 #'s cost me more than it's worth to use. Hoping someone can let me know if I'm wasting my time trying to get the laptop to read my CF card. It's the only type card I have to try the input slot, so can't test to see if the input slot even works. Thanks, -- ‹(•¿•)› Jim

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• Allow single-line accessor (getter/setter) syntax with Checkstyle

  - by Sam3

  We'd like to have trivial Java property accessors using a single line syntax, so they take up much much less space, and are more readable (in terms of 'seeing' the set of accessors quickly). But we do want to enforce multi-line method syntax for everything else in our checkstyle configuration. But I'm not sure how to make this exception for accessors in Checkstyle config and suspect it may not be possible. So we'd like our accessors to look something like this: public String getFoo() { return foo; } public void setFoo(String foo) { this.foo = foo; } [In fact we'd rather not have trivial accessors at all and instead just annotate the private member variables with @Property or something and have the accessors generated for us, since writing endless get and set code delivers no real benefit, but that's a general Java frustration and an aside as far as this question goes.]

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• Entities groups in transactions

  - by Joel

  In the context of "Keys and Entity Groups" article by google: http://code.google.com/appengine/docs/python/datastore/transactions.html 1) "Only use entity groups when they are needed for transactions" 2) "Every entity belongs to an entity group, a set of one or more entities that can be manipulated in a single transaction." It seems like entity groups exist only for the use of transactions, i.e. making one transaction possible between all entities in a group. My question is then why are there parent-child relations between entities and not just a simple declaration of entities to be in a single group (that is defining A,B,C to be in the same group as opposed to defining relations between them "A (parent of) B, B (parent of C)"). What is the benefit from using parent-child relation model when the only purpose is for entities to be in the same group to make transaction possible? Thanks Joel

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• Webserver security, intrusion detection, and file intregrity

  - by enfield

  I would like to add some type of tracking / alerting on some linux webservers running PHP and Apache. In doing searches I have come across a lot of info from 2006-2009. Would like to revisit things and see what others are doing now. The main purpose here is to track when any files are changed and if so alert me somehow. The same goes for IDS and hopefully something that can reside on same server? Since some of these are small scale projects I would prefer opensource/free solutions that are really effective. Although I would still like to hear of other alternatives if someone has the experience and the cost can be justified.

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• Tiny linux box with 2xGbLAN, WLAN and 10MB/s AES throughput?

  - by Nakedible

  I'd like to find a small linux box with the following specifications: Small (mini-ITX size is OK) Fanless Runs Debian At least two gigabit network interfaces WLAN that supports "host ap" with hostapd + mac80211 in AP mode Can encrypt AES at least 10 megabytes per second Total cost $300 or less Solutions from multiple parts also accepted - I can buy an external network card etc. and build the box myself if the components are available. If you don't know about the "host ap" thing, just suggest your solution, I'll find out if I can get that resolved. If I can't get all that, I can possibly skip the "runs Debian" part, and I can definitely skip the hostapd part if the box can be a wireless access point with multiple ESSIDs out of the box. Something like Asus RT-N16 is close - doesn't run Debian easily, and probably doesn't encrypt AES fast enough. Something like Zotac ZBOX HD-ID11 is also close - no idea which WLAN card it has and it lacks second gigabit interface, but otherwise nice.

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• How does the build quality of laptops compare?

  - by pgwillia

  I'm looking to replace my 5 year old laptop. I want my next laptop to endure at least this long. I typically have Thunderbird, Firefox, Eclipse Java IDE, Skype, a ssh session, and Apache Tomcat running. I'm currently running Karmic Ubuntu, but am agnostic about operating system and would move to Win 7 or OS X. I frequently travel with this computer. I also value battery longevity and power conservation (if possible). Above all I'm looking to minimize cost. I think the hardware that best meets my needs is an Intel i7 processor, 8 GB RAM, 100GB @7200 rpm or SSD hardrive, and about 15 inch monitor. These specs are met by most brands. Does anyone know specific pros/cons and build quality for Macbook Pro, Lenovo Thinkpad (W510 or T510), Sony's VPC-F1190, and ASUS G Series G73JH-X1 NoteBook? Are all i7 processors created equal? Do you have other suggestion that meet my needs?

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• Java Framework Choice Question.

  - by Sarang

  We do have many frameworks available in Java. Struts, Swing, JSF 2.0, Spring etc are used as per their priority. Actually, I don't know how many they are as well! But, as I am fresher to Java, even learning after their architecture, I cannot decide which framework can be used with what type of Projects ! Also, I am confused with mixed use of framework like Spring + JSF. What is the benefit to it ? Another thing making me confusing is about the UI components available in market. Like, we do have Primefaces, Ice-faces, MyFaces, Rich-faces. They may or may not have been supporting AJAX in-built. They may contains some bugs as well. What is best choice for Framework + UI component that can directly provide a best feet solution for any project ?

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• immutable strings vs std::string

  - by Caspin

  I've recent been reading about immutable strings, here and here as well some stuff about why D chose immutable strings. There seem to be many advantages. trivially thread safe more secure more memory efficient in most use cases. cheap substrings (tokenizing and slicing) Not to mention most new languages have immutable strings, D2.0, Java, C#, Python, Ruby, etc. Would C++ benefit from immutable strings? Is it possible to implement an immutable string class in c++ (or c++0x) that would have all of these advantages?

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• How to ignore comments when reading a XML file into a XmlDocument?

  - by tunnuz

  Possible duplicate: How to remove all comment tags from XmlDocument Hello, I am trying to read a XML document with C#, I am doing it this way: XmlDocument myData = new XmlDocument(); myData.Load("datafile.xml"); anyway, I sometimes get comments when reading XmlNode.ChildNodes. For the benefit of who's experiencing the same requirement, here's how I did it at the end: /** Validate a file, return a XmlDocument, exclude comments */ private XmlDocument LoadAndValidate( String fileName ) { // Create XML reader settings XmlReaderSettings settings = new XmlReaderSettings(); settings.IgnoreComments = true; // Exclude comments settings.ProhibitDtd = false; settings.ValidationType = ValidationType.DTD; // Validation // Create reader based on settings XmlReader reader = XmlReader.Create(fileName, settings); try { // Will throw exception if document is invalid XmlDocument document = new XmlDocument(); document.Load(reader); return document; } catch (XmlSchemaException) { return null; } } Thank you Tommaso

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• Java is open-source, so what?

  - by typoknig

  Hi all, I always here that Java being open-source is a big benefit, but I fail to see how Java being open-source should draw me to use it as opposed to .NET which is closed-source. This website has some Q&A sections (What is the significance of these developments to the industry? in particular) that give a little info, but is being free the only (or the biggest) advantage to Java being open-source? Since I am a beginner, have any of you pros noticed any major difference since the change was made?

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• Which network performance management software do you use?

  - by Jamie Keeling

  Hello, I am looking at the various options available for network performance management software, some of the solutions I've found so far are: Proprietary: HP - ProCurve Universal: SolarWinds - Orion Open Source: OpenNMS I am trying to discover the benefits of each package over the other and reasons as to why you would go for one (Such as size of the network, overall cost etc..). I'm curious as to which ones other people use and why? Each customer has their own needs and requirements and it would be great to hear some of yours. Thank you for your time.

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• Zero-channel RAID for High Performance MySQL Server (IBM ServeRAID 8k) : Any Experience/Recommendation?

  - by prs563

  We are getting this IBM rack mount server and it has this IBM ServeRAID8k storage controller with Zero-Channel RAID and 256MB battery backed cache. It can support RAID 10 which we need for our high performance MySQL server which will have 4 x 15000K RPM 300GB SAS HDD. This is mission-critical and we want as much bandwidth and performance. Is this a good card or should we replace with another IBM RAID card? IBM ServeRAID 8k SAS Controller option provides 256 MB of battery backed 533 MHz DDR2 standard power memory in a fixed mounting arrangement. The device attaches directly to IBM planar which can provide full RAID capability. Manufacturer IBM Manufacturer Part # 25R8064 Cost Central Item # 10025907 Product Description IBM ServeRAID 8k SAS - Storage controller (zero-channel RAID) - RAID 0, 1, 5, 6, 10, 1E Device Type Storage controller (zero-channel RAID) - plug-in module Buffer Size 256 MB Supported Devices Disk array (RAID) Max Storage Devices Qty 8 RAID Level RAID 0, RAID 1, RAID 5, RAID 6, RAID 10, RAID 1E Manufacturer Warranty 1 year warranty

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• Zend_Cache_Backend_Sqlite vs Zend_Cache_Backend_File

  - by Alekc

  Hi, Currently i'm using Zend_Cache_Backend_File for caching my project (especially responses from external web services). I was wandering if I could find some benefit in migrating the structure to Zend_Cache_Backend_Sqlite. Possible advantages are: File system is well-ordered (only 1 file in cache folder) Removing expired entries should be quicker (my assumption, since zend wouldn't need to scan internal-metadatas for expiring date of each cache) Possible disadvantages: Finding record to read (with files zend check if file exists based on filename and should be a bit quicker) in term of speed. I've tried to search a bit in internet but it seems that there are not a lot of discussion about the matter. What do you think about it? Thanks in advance.

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• Cheap batteries for old laptop

  - by Jeremy French

  I have an old laptop with a kaput battery. I have looked at this question with regards to spares, but most of the sites that are linked too from there have batteries which probably cost more than the laptop is worth. I like keeping the laptop around as a spare, but find it fustrating that it has to be plugged in permanantly. It seems to be that a half good battery would be acceptable for me, for a knock down price. However nothing of the sort seems to exsist. Is there any way to get cheep batteries in such a case? Laptop is a Compaq Presario 900 if that information helps

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