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Hello and welcome to this lecture.



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This is a quick introduction to Etsy for beginners.



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If you already know about Etsy feel free to skip this video and head over to the next video where we



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discuss about Etsy in incumbents.



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We start with a basic introduction to what a key value stories and how it is different from traditional



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databases how to quickly get started with Etsy and how to use declined to to operate.



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Later in this course when we cover high availability we will discuss about what it means to be a distributed



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system how it works in a customer mode what RAF protocol is and what are the best practices around the



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number of nodes in an Natalie cluster so what is Etsy.



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It is a distributed reliable key value store that is simple secure and fast.



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So let's break it up.



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So what is a key value store.



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Traditionally databases have been in a tabular format.



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You must have heard about sequel or relational databases.



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They store data in the form of rows and columns.



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For example here is a table that stores information regarding few individuals.



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The row represents each person and the column represents the type of information being stored.



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A key value store stores information in a key and a value format you put a key and a value.



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And it saves that in the database.



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And then you get the key and it returns the value and you cannot have duplicate keys.



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As such it is not used as a replacement for a regular tabular database.



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Instead it is used to store and retrieve small chunks of data such as configuration data that requires



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fast read and write.



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It is easy to install and get started with Etsy.



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Download the binary extracted and run download the relevant binary of For Your operating system from



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the github releases pages extracted and run the ATV executable.



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When you run SCADA it starts a service that listens on Pt. 2 3 7 9 by default.



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You can then attach any clients to the SCADA service to store and retrieve information in default.



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Client that comes with entity is the SLA control client the entity control client is a command line



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client for entity you can use it to store and retrieve key value pairs to store a key value pair run



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the LCD control said key one command followed by the value value one.



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This creates an entry in the database with the information to retrieve the stored data run the exit



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control get key one command to view more options run the exit control command without any arguments.



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Well that's a quick introduction to SCV.



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Next we will see how it really works in cabinets and later in this course we will discuss more about



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configuring at silly customers in a high availability setup and the best practices around it.