key value store - Page 44

How do I rename a primary key column in MySQL?

- by Vinicius

How do I rename a primary key column in MySQL?

Why can I create a table with PRIMARY KEY on a nullable column?

The following code creates a table without raising any errors: CREATE TABLE test( ID INTEGER NULL, CONSTRAINT PK_test PRIMARY KEY(ID) ) Note that I cannot insert a NULL, as expected: INSERT INTO test VALUES(1),(NULL) ERROR: null value in column "id" violates not-null constraint DETAIL: Failing row contains (null). ********** Error ********** ERROR: null value in column "id" violates not-null constraint SQL state: 23502 Detail: Failing row contains (null). Why can I create a table with a self-contradictory definition? ID column is explicitly declared as NULLable, and it is implicitly not nullable, as a part of the PRIMARY KEY. Does it make sense? Edit: would it not be better if this self-contradictory CREATE TABLE just failed right there?

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How to create a voldemort store?

- by Pankaj

I am trying to understand the Voldemort java API. I am new to non relational databases, so as I understand, Voldemort's store can be compared to a table in relational model. I saw the following code in the documentation. String bootstrapUrl = "tcp://localhost:6666"; StoreClientFactory factory = new SocketStoreClientFactory(new ClientConfig().setBootstrapUrls(bootstrapUrl)); // create a client that executes operations on a single store StoreClient client = factory.getStoreClient("test"); Here, we got a Store client based on the an existing store (test). How can I actually create a store for Voldemort through java?

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Using Rails, how can I set my primary key to not be an integer-typed column?

- by Rudd Zwolinski

I'm using Rails migrations to manage a database schema, and I'm creating a simple table where I'd like to use a non-integer value as the primary key (in particular, a string). To abstract away from my problem, let's say there's a table employees where employees are identified by an alphanumeric string, e.g. "134SNW". I've tried creating the table in a migration like this: create_table :employees, {:primary_key => :emp_id} do |t| t.string :emp_id t.string :first_name t.string :last_name end What this gives me is what seems like it completely ignored the line t.string :emp_id and went ahead and made it an integer column. Is there some other way to have rails generate the PRIMARY_KEY constraint (I'm using PostgreSQL) for me, without having to write the SQL in an execute call? NOTE: I know it's not best to use string columns as primary keys, so please no answers just saying to add an integer primary key. I may add one anyway, but this question is still valid.

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jQuery, wont change value but will change any othere attribute...

- by Phil Jackson

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Running emacs in GNU Screen overrides .emacs settings for [home] key binding in FreeBSD 8.2

- by javanix

If I use the following .emacs file, I am able to go to the beginning/end of the current line using the home/end keys as I would expect. (keyboard-translate ?\C-h ?\C-?) (add-to-list 'load-path "/home/sam/programs/go/go/misc/emacs/" t) (require 'go-mode-load) (global-set-key [kp-home] 'beginning-of-line) ; [Home] (global-set-key [home] 'beginning-of-line) ; [Home] (global-set-key [kp-end] 'end-of-line) ; [End] (global-set-key [end] 'end-of-line) ; [End] However, if I open up a screen session it does not function like this (the [home] key still brings me to the beginning of the buffer for some reason). Here is my .screenrc file if anyone can spot anything funky in there: term xterm defutf8 on defflow off startup_message off # terminfo and termcap for nice 256 color terminal # allow bold colors - necessary for some reason attrcolor b ".I" # tell screen how to set colors. AB = background, AF=foreground termcapinfo xterm 'Co#256:AB=\E[48;5;%dm:AF=\E[38;5;%dm' #use bash as the default login shell defshell -bash

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Refurbished System Windows License Key and OEM Media

- by Timothy R. Butler

According to this question, it is legal to use a Windows 7 OEM license that is presently installed as a 32-bit install with a 64-bit version of Windows 7. With that in mind, I purchased several refurbished systems through TigerDirect. When I received the computers today, I found that they have a Windows 7 license key attached to them that says it is a "refurbished key." A flyer in the box also seemed to imply that this key would not work with regular OEM media. Has anyone tried using regular OEM media with a refurbished key? I had hoped to create a new 64-bit WIM image that I could use on these systems, but I don't want to try replacing the default install with this new 64-bit install only to find that the key won't validate. If it requires a special customized image, is it possible to convert another type of Windows 7 disc into the required sort much as one can convert a retail disc to an OEM one (and vise versa)?

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Compose key on Windows

- by Craig McQueen

On Linux, the Compose key is a great way to enter many symbols. E.g. m-dash — by pressing Compose then --- ö by pressing Compose then :o Euro € by pressing Compose then C= (The Compose key function can be assigned to various keyboard keys, such as right/left Alt, right/left Windows key.) I really miss the Compose key when using Windows. I've looked but so far haven't found any way to get equivalent Compose key functionality on Windows. Does anyone know of how to do it?

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Find the product key I entered for MS Office on Mac

- by Rick Reynolds

I have several legal license keys for Office:mac 2008. I want to do a quick audit of the two machines I've installed office on and verify which license keys are being used where. But I don't see the license key anywhere on the about dialog (or elsewhere). I've seen other postings on the 'net directing me to look at various .plist files, but those only give me the "Product ID" which is different from the license key (which MS calls the "Product Key" on the little sticker). Is there a way outside of calling MS to correlate the Product Key (which is required for installation and is the real license key) to the Product ID I see in the app itself?

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Heroku SSL: Pem is invalid / Key doesn't match the Pem certificate

- by Jane

I bought a Gandi.net SSL certificate and I'm following this tutorial. I created the key file. then transformed it to CSR then added it to Gandi website and waited for the CRT. then removed the password from the key === result : [FINAL KEY] then merged the CRT and the FINAL KEY into one file == result : [FINAL PEM] then heroku ssl:add final_pem final_key --app app_name and... got Pem is invalid / Key doesn't match the Pem certificate. I tried 3 times and I really don't know what's going one. Can you help ?

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SSH use only my password, Ignore my ssh key, don't prompt me for a passphrase

- by Stefan Lasiewski

This is a question regarding the OpenSSH client on Linux, MacOSX and FreeBSD. Normally, I log into systems using my SSH key. Occasionally, I want my SSH client to ignore my SSH key and use a password instead. If I 'ssh hostname', my client prompts me for the Passphrase to my SSH key which is an annoyance. Instead, I want the client to simply ignore my SSH key, so that the server will ask me for my password instead. I tried the following, but I am still prompted for the passphrase to my SSH key. After this, I am prompted for my password. ssh -o PreferredAuthentications=password host.example.org I want to do this on the client side, without any modification of the remote host.

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Known Hosts ECDSA Host Key Multiple Domains on One IP

- by Jonah

Hello, world!, I have a VPS set up with multiple domain names pointing to it. Arbitrarily, I like to access it via SSH through the domain name I'm dealing with. So for example, if I'm doing something with example1.com, I'll log in with ssh [email protected], and if I'm working with example2.com, I'll log in with ssh [email protected]. They both point to the same user on the same machine. However, because SSH keeps track of the server's fingerprint, it tells me that there is an offending host key, and makes me confirm access. $ ssh [email protected] Warning: the ECDSA host key for 'example2.com' differs from the key for the IP address '123.123.123.123' Offending key for IP in /home/me/.ssh/known_hosts:33 Matching host key in /home/me/.ssh/known_hosts:38 Are you sure you want to continue connecting (yes/no)? Is there a way to ignore this warning? Thanks!

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Remap Apple MacBook Eject key in Windows?

- by user1238528

I have a MacBook with Windows 7 on it as my daily driver. My MacBook has a nearly useless Eject key, but I wish it was a forward delete key. KeyRemap4Macboook works great in OS X. Is there any software that is equivalent in Windows? I have tried KeyTweaks and HotKeys and neither of them will recognize the Eject key. I looked it up and I think it is key 161. Is there any way to make the key into a more useful forward delete? Could I just go into the registry and do it that way?

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Enter / Return key stops working

- by andygrunt

I have a Dell Latitude E5400 laptop running Windows 7. Everything runs fine on it for days then I suddenly notice the enter/return key is no longer working e.g. I could be writing an email, press enter for a new line but it doesn’t ‘register’ – so no new line. I thought it might be some dirt under the key perhaps so I tried running the Windows onscreen keyboard but the Enter key on that doesn’t work either. A reboot always fixes the problem but it’s a pain. Any ideas a) how to fix it and b) out of interest, is there some other key combination that I can use as an alternative to using the Enter key when I need to?

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sudo su - username while keeping ssh key forwarding

- by Florian Schulze

If I have a server A into which I can login with my ssh key and I have the ability to "sudo su - otheruser", I lose key forwarding, because the env variables are removed and the socket is only readable by my original user. Is there a way I can bridge the key forwarding through the "sudo su - otheruser", so I can do stuff on a server B with my forwarded key (git clone and rsync in my case)? The only way I can think of is adding my key to authorized_keys of otheruser and "ssh otheruser@localhost", but that's cumbersome to do for every user and server combination I may have.

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Enter / Return key stops working

- by andygrunt

I have a Dell Latitude E5400 laptop running Windows 7. Everything runs fine on it for days then I suddenly notice the enter/return key is no longer working e.g. I could be writing an email, press enter for a new line but it doesn’t ‘register’ – so no new line. I thought it might be some dirt under the key perhaps so I tried running the Windows onscreen keyboard but the Enter key on that doesn’t work either. A reboot always fixes the problem but it’s a pain. Any ideas a) how to fix it and b) out of interest, is there some other key combination that I can use as an alternative to using the Enter key when I need to? UPDATE: Thanks to CarlF's suggestion, I tried exiting running programmes and found it seems to be a problem with PhraseExpress.

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Cannot use `su` or `sudo` after set up key-based access to SSH

- by OrangeTux

I'm following this tuturial to setup key-based access to the SSH I created a user. I add copy the key to the client via ssh-copy-id <username>@<host> Becasuse ssh <username>@<host> still prompts for a password I run ssh-add on the local machine. The terminal doens't prompt for a password, I can login without using a password. But I cannot run su anymore. Every input for the password results in Authentication failure. I tried it again. But before coping the key, I added to the sudoer file. Copied key, ssh-add. But now I cannot login to my SSH shell att all? How can I setup a key-based SSH access with the possibiluty to use su or sudo?

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XSLT: Get node where one certain value is present

- by Kim Andersen

Hi there I have the following XML: <data> <page id="1118"> <itms> <values> <value>1104</value> </values> </itms> </page> <page id="1177"> <itms> <values> <value>1273</value> <value>1215</value> </values> </itms> </page> </data> I need to get the @id from the < page , where a certain value is present in one of the < value -tags. The id that need to be in the < value is kept in this: $itm/@id. This means that if my $itm/@id is equal to 1273, I need to get 1177 returned. I'm not quite sure how to achieve this. Actually I could have XML that looks like this as well: <data> <page id="1118"> <itms> <values> <value>1104</value> </values> </itms> </page> <page id="1177"> <itms> <values> <value>1273</value> <value>1215</value> </values> </itms> </page> <page id="1352"> <itms> <values> <value>1242</value> <value>1273</value> </values> </itms> </page> </data> If that's the case, I need the latest id, so this means that if the $itm/@id matches values in more < page 's, then I need to grab the value from the latest page. I the above case that would be 1352. Hope this makes sense to you guys. And by the way, I work with Umbraco CMS if that does any difference. Best Regards, Kim

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Key ATG architecture principles

- by Glen Borkowski

Overview The purpose of this article is to describe some of the important foundational concepts of ATG. This is not intended to cover all areas of the ATG platform, just the most important subset - the ones that allow ATG to be extremely flexible, configurable, high performance, etc. For more information on these topics, please see the online product manuals. Modules The first concept is called the 'ATG Module'. Simply put, you can think of modules as the building blocks for ATG applications. The ATG development team builds the out of the box product using modules (these are the 'out of the box' modules). Then, when a customer is implementing their site, they build their own modules that sit 'on top' of the out of the box ATG modules. Modules can be very simple - containing minimal definition, and perhaps a small amount of configuration. Alternatively, a module can be rather complex - containing custom logic, database schema definitions, configuration, one or more web applications, etc. Modules generally will have dependencies on other modules (the modules beneath it). For example, the Commerce Reference Store module (CRS) requires the DCS (out of the box commerce) module. Modules have a ton of value because they provide a way to decouple a customers implementation from the out of the box ATG modules. This allows for a much easier job when it comes time to upgrade the ATG platform. Modules are also a very useful way to group functionality into a single package which can be leveraged across multiple ATG applications. One very important thing to understand about modules, or more accurately, ATG as a whole, is that when you start ATG, you tell it what module(s) you want to start. One of the first things ATG does is to look through all the modules you specified, and for each one, determine a list of modules that are also required to start (based on each modules dependencies). Once this final, ordered list is determined, ATG continues to boot up. One of the outputs from the ordered list of modules is that each module can contain it's own classes and configuration. During boot, the ordered list of modules drives the unified classpath and configpath. This is what determines which classes override others, and which configuration overrides other configuration. Think of it as a layered approach. The structure of a module is well defined. It simply looks like a folder in a filesystem that has certain other folders and files within it. Here is a list of items that can appear in a module: MyModule: META-INF - this is required, along with a file called MANIFEST.MF which describes certain properties of the module. One important property is what other modules this module depends on. config - this is typically present in most modules. It defines a tree structure (folders containing properties files, XML, etc) that maps to ATG components (these are described below). lib - this contains the classes (typically in jarred format) for any code defined in this module j2ee - this is where any web-apps would be stored. src - in case you want to include the source code for this module, it's standard practice to put it here sql - if your module requires any additions to the database schema, you should place that schema here Here's a screenshots of a module: Modules can also contain sub-modules. A dot-notation is used when referring to these sub-modules (i.e. MyModule.Versioned, where Versioned is a sub-module of MyModule). Finally, it is important to completely understand how modules work if you are going to be able to leverage them effectively. There are many different ways to design modules you want to create, some approaches are better than others, especially if you plan to share functionality between multiple different ATG applications. Components A component in ATG can be thought of as a single item that performs a certain set of related tasks. An example could be a ProductViews component - used to store information about what products the current customer has viewed. Components have properties (also called attributes). The ProductViews component could have properties like lastProductViewed (stores the ID of the last product viewed) or productViewList (stores the ID's of products viewed in order of their being viewed). The previous examples of component properties would typically also offer get and set methods used to retrieve and store the property values. Components typically will also offer other types of useful methods aside from get and set. In the ProductViewed component, we might want to offer a hasViewed method which will tell you if the customer has viewed a certain product or not. Components are organized in a tree like hierarchy called 'nucleus'. Nucleus is used to locate and instantiate ATG Components. So, when you create a new ATG component, it will be able to be found 'within' nucleus. Nucleus allows ATG components to reference one another - this is how components are strung together to perform meaningful work. It's also a mechanism to prevent redundant configuration - define it once and refer to it from everywhere. Here is a screenshot of a component in nucleus: Components can be extremely simple (i.e. a single property with a get method), or can be rather complex offering many properties and methods. To be an ATG component, a few things are required: a class - you can reference an existing out of the box class or you could write your own a properties file - this is used to define your component the above items must be located 'within' nucleus by placing them in the correct spot in your module's config folder Within the properties file, you will need to point to the class you want to use: $class=com.mycompany.myclass You may also want to define the scope of the class (request, session, or global): $scope=session In summary, ATG Components live in nucleus, generally have links to other components, and provide some meaningful type of work. You can configure components as well as extend their functionality by writing code. Repositories Repositories (a.k.a. Data Anywhere Architecture) is the mechanism that ATG uses to access data primarily stored in relational databases, but also LDAP or other backend systems. ATG applications are required to be very high performance, and data access is critical in that if not handled properly, it could create a bottleneck. ATG's repository functionality has been around for a long time - it's proven to be extremely scalable. Developers new to ATG need to understand how repositories work as this is a critical aspect of the ATG architecture. Repositories essentially map relational tables to objects in ATG, as well as handle caching. ATG defines many repositories out of the box (i.e. user profile, catalog, orders, etc), and this is comprised of both the underlying database schema along with the associated repository definition files (XML). It is fully expected that implementations will extend / change the out of the box repository definitions, so there is a prescribed approach to doing this. The first thing to be sure of is to encapsulate your repository definition additions / changes within your own module (as described above). The other important best practice is to never modify the out of the box schema - in other words, don't add columns to existing ATG tables, just create your own new tables. These will help ensure you can easily upgrade your application at a later date. xml-combination As mentioned earlier, when you start ATG, the order of the modules will determine the final configpath. Files within this configpath are 'layered' such that modules on top can override configuration of modules below it. This is the same concept for repository definition files. If you want to add a few properties to the out of the box user profile, you simply need to create an XML file containing only your additions, and place it in the correct location in your module. At boot time, your definition will be combined (hence the term xml-combination) with the lower, out of the box modules, with the result being a user profile that contains everything (out of the box, plus your additions). Aside from just adding properties, there are also ways to remove and change properties. types of properties Aside from the normal 'database backed' properties, there are a few other interesting types: transient properties - these are properties that are in memory, but not backed by any database column. These are useful for temporary storage. java-backed properties - by nature, these are transient, but in addition, when you access this property (by called the get method) instead of looking up a piece of data, it performs some logic and returns the results. 'Age' is a good example - if you're storing a birth date on the profile, but your business rules are defined in terms of someones age, you could create a simple java-backed property to look at the birth date and compare it to the current date, and return the persons age. derived properties - this is what allows for inheritance within the repository structure. You could define a property at the category level, and have the product inherit it's value as well as override it. This is useful for setting defaults, with the ability to override. caching There are a number of different caching modes which are useful at different times depending on the nature of the data being cached. For example, the simple cache mode is useful for things like user profiles. This is because the user profile will typically only be used on a single instance of ATG at one time. Simple cache mode is also useful for read-only types of data such as the product catalog. Locked cache mode is useful when you need to ensure that only one ATG instance writes to a particular item at a time - an example would be a customers order. There are many options in terms of configuring caching which are outside the scope of this article - please refer to the product manuals for more details. Other important concepts - out of scope for this article There are a whole host of concepts that are very important pieces to the ATG platform, but are out of scope for this article. Here's a brief description of some of them: formhandlers - these are ATG components that handle form submissions by users. pipelines - these are configurable chains of logic that are used for things like handling a request (request pipeline) or checking out an order. special kinds of repositories (versioned, files, secure, ...) - there are a couple different types of repositories that are used in various situations. See the manuals for more information. web development - JSP/ DSP tag library - ATG provides a traditional approach to developing web applications by providing a tag library called the DSP library. This library is used throughout your JSP pages to interact with all the ATG components. messaging - a message sub-system used as another way for components to interact. personalization - ability for business users to define a personalized user experience for customers. See the other blog posts related to personalization.

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New Procurement Report for Transportation Sourcing

- by John Murphy

Welcome to our fourth annual transportation procurement benchmark report. American Shipper, in partnership with the Council of Supply Chain Management Professionals (CSCMP) and the Retail Industry Leaders Association (RILA), surveyed roughly 275 transportation buyers and sellers on procurement practices, processes, technologies and results. Some key findings: • Manual, spreadsheet-based procurement processes remain the most prevalent among transportation buyers, with 42 percent of the total • Another 25 percent of respondents use a hybrid platform, which presumably means these buyers are using spreadsheets for at least one mode and/or geography • Only 23 percent of buyers are using a completely systems-based approach of some kind • Shippers were in a holding pattern with regards to investment in procurement systems the past year • Roughly three-quarters of survey respondents report that transportation spend has increased in 2012, although the pace has declined slightly from last year’s increases • Nearly every survey respondent purchases multiple modes of transportation • The number of respondents with plans to address technology to support the procurement process has increased in 2012. About one quarter of respondents who do not have a system report they have a budget for this investment in the next two years.

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Enterprise Trade Compliance: Changing Trade Operations around the World

- by John Murphy

We live in a world of incredible bounty and speed where any product can be delivered anywhere on earth. However, our world is also filled with challenges for business – where volatility, uncertainty, risk, and chaos are our daily companions. To prosper amid the realities of this new world, organizations cannot rely on old strategies; they need new business models. Key trends within the global economy are mandating that companies fully integrate global trade management best practices within broader supply chain management strategies, rather than simply leaving it as a discrete event at the end of the order or procurement cycle. To explain, many companies face a complicated and changing compliance environment. This is directly linked to the speed and configuration of the supply chain, particularly with the explosion of new markets, shorter service cycles and ship times, accelerating rates of globalization and outsourcing, and increasing product complexity and regulation. Read More...

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Retrieve Value Using Key From a Collection in Access 2000

- by Mikecancook

I know this is a simple question but it's aggravating me. If I have a key/value pair in a collection but I can't seem to get the value out using the key. I can get the key using the value but not vice versa. Is there some magical way to accomplish this? For example: Dim CycleList As Collection Dim Value as String Set CycleList = New Collection CycleList.Add 1, "Some Value" Value = CycleList(1) I've also tried CycleList.Item(1) and it's the same result, Value = 1.

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Can i store a Queue in viewstate? only will store the first item i add to queue

- by Mausimo

Hey, as the question states i am trying to store a Queue in a viewstate (to track postbacks and refreshes to stop a form from resubmitting). Here is just the viewstate code: private Queue<string> p_tempQue { set { ViewState["sTemp"] = value; } get { return (Queue<string>)ViewState["sTemp"]; } } //BasePage constructor public BasePage() { //create a Queue of string //sTemp = new Queue(); this.Load += new EventHandler(this.Page_Load); this.Init += new EventHandler(this.Page_Init); } //In the 'page_Init' event we have created a simple hidden field by name 'hdnGuid' which is attached to the page on the first hit itself. protected void Page_Init(object sender, EventArgs e) { //initializing the hidden field //create a hidden field with a ID HiddenField hdnGuid = new HiddenField(); hdnGuid.ID = "hdnGuid"; //if it is the first time the page is loaded, create a new guid and assign it as the hidden field value if (!Page.IsPostBack) hdnGuid.Value = Guid.NewGuid().ToString(); //add the hidden field to the page Page.Form.Controls.Add(hdnGuid); } //In the 'page_Load' event we check if the hidden field value is same as the old value. In case the value is not same that means it's a 'postback' //and if the value is same then its 'refresh'. As per situation we set the 'httpContent.Items["Refresh"]' value. protected void Page_Load(object sender, EventArgs e) { if(p_tempQue != null) sTemp = p_tempQue; else sTemp = new Queue<string>(); //The hdnGuid will be set the first time page is loaded, else the hdnGuid //will be set after each time the form is submitted using javascript. //assign the hidden field currently on the page for manipulation HiddenField h1 = (HiddenField)(Page.Form.FindControl("hdnGuid")); //create an instance of the GuidClass GuidClass currentGuid = new GuidClass(); //set the GuidClass Guid property to the value of the hidden field currentGuid.Guid = h1.Value; //check to see if the Queue of strings contains the string which is the current Guid property of the GuidClass //if the are equal, then the page was refreshed if (sTemp.Contains<string>(currentGuid.Guid)) { //adds item as key/value pair to share data between an System.Web.IHttpModule interface and an System.Web.IHttpHandler interface during an HTTP request. System.Web.HttpContext.Current.Items.Add("IsRefresh", true); } //if they are not requal, the page is not refreshed else { //if the current Guid property in the GuidClass is not null or not an empty string //add the new Guid to the Queue if (!(currentGuid.Guid.Equals(null) || currentGuid.Guid.Equals(""))) sTemp.Enqueue(currentGuid.Guid); System.Web.HttpContext.Current.Items.Add("IsRefresh", false); } p_tempQue = sTemp; }

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BUILD 2012 day 1 Keynote recap

- by pluginbaby

On October 30, 2012 Steve Ballmer kicked off the first BUILD conference keynote. Steve shared some insights around Windows 8: 4 million customers upgraded to Windows 8 over the weekend since the October 26 release (so in 3 days only!). Focus on sharing code between Windows 8 and Windows Phone 8. Syncing everything through SkyDrive Xbox Music free streaming and Xbox Smart Glass. He did all the demos himself, showing off great “Windows 8 generation” devices already available (including an 82-inch Windows 8 “slate” by Perceptive Pixel). Steve Guggenheimer (Microsoft's Corporate Vice President DPE) talked about The Business Opportunity with Windows 8. Notable announcements of day 1: The Windows Phone 8 SDK is now available at dev.windowsphone.com (includes SDK, free version of VS2012, Blend 5, and emulators). Release of the .NET Framework for Windows Phone 8: Ability to use C# 5 or Visual Basic 11 features in your code (async programming mode, ...), share code between WP8 and Windows Store apps. Windows Phone 8 individual developer registration is reduced to $8 for the next 8 days! (hurry up…) Note: strange absence of Steven Sinofsky on stage… Watch the entire keynote online: http://channel9.msdn.com/Events/Build/2012/1-001 Read the full transcript: http://www.microsoft.com/en-us/news/Speeches/2012/10-30BuildDay1.aspx

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Embedded non-relational (nosql) data store

- by Igor Brejc

I'm thinking about using/implementing some kind of an embedded key-value (or document) store for my Windows desktop application. I want to be able to store various types of data (GPS tracks would be one example) and of course be able to query this data. The amount of data would be such that it couldn't all be loaded into memory at the same time. I'm thinking about using sqlite as a storage engine for a key-value store, something like y-serial, but written in .NET. I've also read about FriendFeed's usage of MySQL to store schema-less data, which is a good pointer on how to use RDBMS for non-relational data. sqlite seems to be a good option because of its simplicity, portability and library size. My question is whether there are any other options for an embedded non-relational store? It doesn't need to be distributable and it doesn't have to support transactions, but it does have to be accessible from .NET and it should have a small download size. UPDATE: I've found an article titled SQLite as a Key-Value Database which compares sqlite with Berkeley DB, which is an embedded key-value store library.

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