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A (also known as a key-value store and key-value store database) is a type of Nike Men’s Air Relentless 6 Running Shoes Grey Gris/Dark Grey/Volt/Wolf Grey/White 000 aN8aN6kH3A
database that uses a simple key/value method to store data.

The key-value part refers to the fact that the database storesdata as a collection of key/value pairs. This is a simple method of storing data, and it is known toscale well.

The key-value pairis a well established conceptin manyprogramming languages. Programming languages typicallyrefer to akey-valueas an or . A key-valueis also commonlyreferred to as a or .

Examples of Key-ValueStores

Below are examples of key-value stores.

These are simpleexamples, but the aim is to provide an idea of thehow a key-value database works.

Phone Directory

Artist Info

Stock Trading

This example uses a list as the value.

The list contains the stock ticker, whether its a “buy” or “sell” order, the number of shares, and the price.

IP Forwarding Table

This is an example of an IP forwarding table. It forwards an IP address to a MAC address of a physical computer.

What Type of Data can be stored in aKey-Value Database?

The Key

The key in a key-value pair must (or at least, ) be unique. This is the unique identifier that allows you to access thevalue associated with that key.

In theory, the key could be anything. But this may depend on the DBMS.OneDBMS may impose limitations while another may impose none.

In Redis for example, the maximum allowed key size is 512 MB. You can use any binary sequence as a key, from a short string of text,to the contents of an image file. Even the empty string is a valid key.

However, for performance reasons,you shouldavoid having a key that’s too long. But too short can causereadability issues too. In any case, the key should follow an agreed convention in order to keep things consistent.

The Value

The value in a key-value store can be anything, such astext (long or short), a number,markup code such asHTML, programming code such as PHP, an image, etc.

The value could also be a list, or even another key-value pair encapsulated in an object.

Some key-store DBMSs allow you to specify a data type for the value. For example, you could specify that the value should be an integer. Other DBMSs don’t providethis functionality and therefore, the valuecould be of any type.

As an example, the Redis DBMS allows you to specify the following data types:

Check outRedis’ Nina Womens Chicory Open Toe Casual Espadrille Sandals Platino lH9H9M
for a more detailed explanation of these.

What can aKey-ValueDatabase be used for?

Key-value databasescan be applied to many scenarios.For example, key-value stores can be useful for storing things such as the following.

General Web/Computers


Networking/Data Maintenance

Key-value databases caneven store whole webpages, by using the URL asthe key and theweb page as the value.

But depending on what needs to be donewith the data, other DBmodels could be more suitable for storing web pages and articles.

Examples of Key-Value Database Management Systems

Here are some of the s that use the key-value approach.

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The Splunk® Software Development Kit (SDK) for JavaScript is open source and uses the Apache v2.0 license. If you want to make a code contribution, go to the Miz Mooz Womens Shay Shay Rust gdtagal33Z
page for more information.

This overview tells you more about:

What you can do with the Splunk SDK for JavaScript

This SDK contains library code and examples designed to enable developers to build applications using Splunk.

With the Splunk SDK for JavaScript you can write JavaScript applications to programmatically interact with the Splunk engine. The SDK is built on top of the REST API, providing a wrapper over the REST API endpoints. So that means with fewer lines of code, you can write applications that:

You can create client-side script, server-side script, or both to interact with Splunk. We tested the Splunk SDK for JavaScript on the following web browsers:

If you find any issues with a particular browser, please let us know at .

Add visualizations to your web pages

Use client-side JavaScript to add visualization components to your web pages. Go to learn about how to use the pre-built files and tools included with the SDK. To see the Splunk SDK for JavaScript in action, run the to see pages that implement different components, like the Timeline control shown here:

And, other examples show how to integrate third-party visualization tools, like the Inuovo Womens 7910 Fashion Sandals Coconut iWqSIIG
component shown here:

Create complete applications

You can create complete applications using server-side JavaScript. Check out the . They'll show you ropes, from listing jobs and running searches to handling the results in JSON.

The Splunk SDK for JavaScript architecture and components

The Splunk SDK for JavaScript is divided into two areas:

The Splunk SDK for JavaScript supports server-side and client-side JavaScript. You can decide which components to install. The SDK includes a Splunk app as a translation layer between Splunk's XML output and the JSON that is used by JavaScript. The SDK also includes several third-party libraries, which are included for functionality such as cross-domain communication and other features used by the examples.

The Splunk SDK for JavaScript library files include:

Read more about:

Entities and collections

Most REST endpoints in the Splunk REST API can be thought of as operations on entities and collections of entities. For example, there are operations to create, modify, and remove apps. Similarly, there are operations to create, manage, remove, and get results from search jobs. For each logical grouping, the base abstractions are as follows:

and are a type of :

Native JavaScript objects

The service layer provides higher-level access to Splunk REST API through native JavaScript objects. Architecturally, each object implements either or . For example:

Each object has the default operations available to its superclass: has update and remove methods, while has create and list methods.


To account for permissions to view apps, system files, and other entity resources by users throughout a Splunk installation, Splunk provides access to entity resources based on a . This is similar to the app/user context that is used by the Splunk REST API when accessing resources using endpoints.

The namespace is defined by:

In general, when you specify a namespace you can specify any combination of , , and the SDK library will reconcile the values, overriding them as appropriate. If a namespace is not explicitly specified, the current user is used for and the default app is used for .

Here are some example combinations of , , :

State management

When you create an object for an entity, the entity's properties are read and copied from the server, creating a local snapshot of those values. Any changes to the object are only made to the object in your local cache. Your changes are not made on the server until you explicitly call the object's method and include the specific properties and values to update. And, changes made on the server don't affect your local copy unless you call the object's method, which replaces any changes you have made to your local object with an updated snapshot from the server.

The SDK does not perform validation on values when you set them, but rather passes these values to the server for validation. Any error messages from the server are then sent back to you through the SDK.

The Service class

The class is the entry point for using the Splunk SDK for JavaScript. Communication with Splunk starts by creating a instance and logging in, for example:

If you provide a username and password, you will be auto-logged in as long as is not disabled. (Otherwise, you'd need to explicitly call the method next.) If a subsequent request returns a 401 error, the SDK attempts to log in once.

You can pass more arguments to the constructor, such as , , and . For example, if you already got a Splunk session key from another source, you can use it as follows:

The class is also where you access the different resources in Splunk. For example, this example gets the collection:

You can specify a namespace when you create a new instance, but you can also specify a namespace as you fetch a resource:

When you retrieve a collection, you can limit the number of items you retrieve at a time by specifying and parameters. Set to the number of items to retrieve, and use to indicate where in the collection to retrieve them. For example, to page through 10 jobs at a time in the collection, you'd set to 10, and to increments of 10. This retrieves 10 jobs starting at the 21st job in the collection:

Asynchronous model

JavaScript is asynchronous, so rather than return values, functions expect a callback as their last argument. In return, every callback takes an error parameter as its first argument.

The following pseudo-code shows how to create a job:

However, writing in this nesting, diagonal style can become tiresome and hard to maintain, so Splunk provides the module to ease development. Code could then be written as follows:

executes each function in turn, and passes the results to the next function. If any function encounters an error (by calling the callback with the first parameter not equal to null), it immediately calls the final callback with the error.

"user": The resource is private to a specific user, as specified by .

In this tutorial we’ll introduce Placeholders, and we’re also going to show how you can make your own HTML templates CMS-ready.

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You can use HTML templates to customise the look of your website, define Placeholders to mark sections for managed content and use special tags to generate menus and more.

You can define multiple templates, with different layouts or built-in components, and choose them for each page as required. A page’s template can be switched for another at any time.

You’ll find the site’s templates in mysite/templates .

If you didn’t change the automatically-created home page’s template, it’s fullwidth.html , the first one listed in the project’s CMS_TEMPLATES tuple:

Placeholders are an easy way to define sections in an HTML template that will be filled with content from the database when the page is rendered. This content is edited using django CMS’s frontend editing mechanism, using Django template tags.

fullwidth.html contains a single placeholder, {% placeholder "content" %} .

You’ll also see {% load cms_tags %} in that file - cms_tags is the required template tag library.

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Add a couple of new placeholders, {% placeholder "feature" %} and {% placeholder "splashbox" %} to the template’s HTML structure. You can add them anywhere, for example:

If you switch to Structure mode, you’ll see the new placeholders available for use.

The content of the placeholders we’ve encountered so far is different for every page. Sometimes though you’ll want to have a section on your website which should be the same on every single page, such as a footer block.

You could hard-code your footer into the template, but it would be nicer to be able to manage it through the CMS. This is what static placeholders are for.

static placeholders

Static placeholders are an easy way to display the same content on multiple locations on your website. Static placeholders act almost like normal placeholders, except for the fact that once a static placeholder is created and you added content to it, it will be saved globally. Even when you remove the static placeholders from a template, you can reuse them later.

So let’s add a footer to all our pages. Since we want our footer on every single page, we should add it to our base template ( mysite/templates/base.html ). Place it at the bottom of the HTML <body> :


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