Skip to main content

Amazon DynamoDB : Fully managed proprietary NoSQL database service

 Amazon DynamoDB is a fully managed proprietary NoSQL database service that supports key–value and document data structures and is offered by Amazon.com as part of the Amazon Web Services portfolio.



Dynamo had a multi-leader design requiring the client to resolve version conflicts and DynamoDB uses synchronous replication across multiple data centers for high durability and availability. 


DynamoDB was announced by Amazon CTO Werner Vogels on January 18, 2012, and is presented as an evolution of Amazon SimpleDB.


DynamoDB differs from other Amazon services by allowing developers to purchase a service based on throughput, rather than storage. If Auto Scaling is enabled, then the database will scale automatically.


To prevent data loss, DynamoDB features a two-tier backup system of replication and long-term storage.

Each partition features three nodes, each of which contains a copy of that partition's data.

Each node also contains two data structures: a B tree used to locate items, and a replication log that notes all changes made to the node.

DynamoDB periodically takes snapshots of these two data structures and stores them for a month in S3 so that engineers can perform point-in-time restores of their databases.


Official website : http://aws.amazon.com/dynamodb/



Labels:

Comments

Post a Comment

Popular posts from this blog

Transform Ubuntu into Xubuntu

Installation 1. Open the terminal by Ctrl+Alt+T     and type    sudo apt-get install xubuntu-desktop gksu leafpad synaptic         2. Type your password & Press Enter. Now an intensive operation is being launched. Simply wait to complete the whole process. Login To Xubuntu 1. After completing the installation logout ubuntu. Note: logout not restart or shutdown. 2. In the login window click on the ubuntu logo, next to your userName & select Xubuntu Sesion 3. Enter your password and Now the Xubuntu desktop appears. :) The next thing is to clean up. Clean Up 1. Now its time to clean up, inorder to prevent system pollution problems. Note: The clean up will remove as much as possible ubuntu's desktop environment Unity. So after that you can't use Unity. 2. Open terminal by Ctrl+Alt+T and type the following  sudo apt-get remove nautilus gnome-power-manager gnome-screensaver gnome-termina*...
Post a Comment
Read more

PostgreSQL :: open-source relational database management system (RDBMS)

 PostgreSQL also known as Postgres, is a free and open-source relational database management system (RDBMS) emphasizing extensibility and SQL compliance.  PostgreSQL features transactions with ACID properties, automatically updatable views, materialized views, triggers, foreign keys, and stored procedures. It is designed to handle a range of workloads, from single machines to data warehouses or Web services with many concurrent users. PostgreSQL manages concurrency through multiversion concurrency control (MVCC), which gives each transaction a "snapshot" of the database, allowing changes to be made without affecting other transactions.  PostgreSQL provides an asynchronous messaging system that is accessed through the NOTIFY, LISTEN and UNLISTEN commands. PostgreSQL includes built-in support for regular B-tree and hash table indexes, and four index access methods: generalized search trees (GiST), generalized inverted indexes (GIN), Space-Partitioned GiST (SP-GiST) and Bloc...
Post a Comment
Read more

15 Free Feature Rich Bootstrap Admin Templates

1. Charisma Charisma  comes with 9 different skins/themes to suit your style and application type. It is clean, easy to use and contains over 1000 icons and 15 plugins. It is also filled with numerous UI elements like star rating, pop over, custom tooltip, alerts, Ajax loaders, notifications and much more.  2. Siminta Siminta  comes with a large collection of plugins and UI components that help you make your work easy. All codes are self-explanatory (with comments) and the overall structure is easy to customize. It is free for personal as well as commercial use. 3. Metis Metis  is a free Twitter Bootstrap template with various layouts, components, forms, tables, maps, charts and menu level. It is also equipped with file manager, maps, error page structure, grid system and login page.  4. Hierapolis Yet another private  admin template  based on Twitter Bootstrap 3. It consists of beautiful fo...
1 comment
Read more