what is a primary key in amazon dynamodb?

DynamoDB uses its hash function to determine where to store a new item, in this case based on the hash value of the string Dog. It offers: reliable performance even as it scales;; a managed experience, so you won't be SSH-ing into servers to upgrade the crypto libraries;; a small, simple API allowing for simple key-value access as well as more advanced query patterns. Each item in a DynamoDB table has a unique primary key. © 2020, Amazon Web Services, Inc. or its affiliates. In DynamoDB the primary key must be specified along with the table name while creating a table. Better option is to assemble primary key from multiple indices. The Table Creation requires not only setting a name, but also the primary key; which identifies table items. There are few options: Core Concepts of AWS DynamoDB. Amazon AWS DynamoDB is a key-value store No-SQL database. Partition key — A simple primary key, composed of one attribute known as the partition key. Amazon DynamoDB indexes. If you query for an item in DynamoDB using the primary key or a secondary index, you get the entire item back. DynamoDB supports two different kinds of primary keys: Partition key– A simple primary key that is composed of one attribute known as the partition key. There are two types of primary keys in DynamoDB: Partition key: This is a simple primary key that's unique to each item in the table. DynamoDB streams record events by modifying the table data. The choice of the primary key is particularly important because of the way that Amazon stores and retrieves the data. This is anti-pattern in DynamoDB which is build to scale across many partitions/shards/servers. Attributes. The first attribute is the Partition Key and the second attribute is the Sort Key (forming a composite primary key). Primary Key. Also referred to as composite primary key, this key comprises of two attributes, namely, partition key and sort key.DynamoDB uses the partition key value as input to an internal hash function. The primary key is used to uniquely identify an item in a table, and all the queries made against the table are using the primary key. 1. Two items cannot have a similar primary key. asked Nov 20 '17 at 18:34. There are no such restrictions for other, non-key attributes. The only data types allowed for primary key attributes are string, number, or binary. The DynamoDB GetItem action is very efficient: It uses the primary key values to determine the exact storage location of the item in question, and retrieves it directly from there. Amazon DynamoDB is a document database that has high scalability. Cloud Bigtable is a NoSQL wide-column datastore from Google. A primary key is a unique attribute that is necessary while creating a table, it cannot be null at any given point. It was given by Amazon in 2012. 8. Value of the Partition key is input to an internal hash function which determines the partition or physical location on which the data is stored. The Key schema can be made up of two keys: Partition Key (PK) is also known as HASH ; The Sort Key (SK) is also known as RANGE; When using the AWS DynamoDB API eg. Please write to us at contribute@geeksforgeeks.org to report any issue with the above content. Click here to return to Amazon Web Services homepage, Using write sharding to distribute workloads evenly, Choosing the right DynamoDB partition key. DynamoDB does not support auto-increment primary keys due to scaling limitations and cannot be guaranteed across multiple servers. Hash key in DynamoDB. The primary key must be unique across the table. One field is the partition key, also known as the hash key, and the other is the sort key, sometimes called the range key. A composite primary key provides users with additional flexibility when querying data. Keys (Amazon calls them primary keys) can be composed of one attribute, called a hash key, or a compound key called the hash and range key. Please use ide.geeksforgeeks.org, generate link and share the link here. Say your Primary Key is PK1, and you want to make in PK2. DynamoDB supports two different kinds of primary keys: The first attribute is the partition key, and … It has backup facilities and has high security. Keys (Amazon calls them primary keys) can be composed of one attribute, called a hash key, or a compound key called the hash and range key. DynamoDB streams record events by modifying the table data. DynamoDB is a key-value, noSQL database developed by Amazon. DynamoDB stores a given item as a single blob of data. AWS DynamoDB uses Partition key’s value to distinguish items in a table. acknowledge that you have read and understood our, GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Analysis of test data using K-Means Clustering in Python, ML | Types of Learning – Supervised Learning, Linear Regression (Python Implementation), Mathematical explanation for Linear Regression working, ML | Normal Equation in Linear Regression, Difference between Gradient descent and Normal equation, Difference between Batch Gradient Descent and Stochastic Gradient Descent, Google Cloud Platform - Ways of Uploading Data to GCS, Google Cloud Platform - Ways of Serving files from GCS, Connecting Custom Domain To Website Hosted On Firebase, Digital Low Pass Butterworth Filter in Python, Advantages of Virtual Machines over Portable Containers, MATLAB - Read images using imread() function, Power-of-Two Free Lists Allocators | Kernal Memory Allocators, DynamboDB – Tables, Items, and Attributes, Decision tree implementation using Python, Best Python libraries for Machine Learning, Underfitting and Overfitting in Machine Learning, Write Interview DynamoDB is known for low latencies and scalability . Employee ID is the primary key for the table Employee records. share | improve this question | follow | asked Apr 7 '15 at 21:30. user1836155 user1836155. The primary key that uniquely identifies each item in an Amazon DynamoDB table can be simple (a partition key only) or composite (a partition key combined with a sort key). Here’s what you could do: 1. It is also used for “always on” use cases with high volume transactional requests (reads and writes). The output from the hash function sets the partition in which the item will be stored. Google Cloud Bigtable vs Amazon DynamoDB. Partition key — A simple primary key, composed of one attribute known as the partition key. Primary key is used to uniquely identify an item in a table. Understanding the primary key is a crucial part of planning your data model for a DynamoDB table. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. DynamoDB is a hosted NoSQL database offered by Amazon Web Services (AWS). DynamoDB does not require attributes on items except for attributes that make up your primary key. E.g. So both have a different purpose and together help to do complex query. There are two types of primary keys in DynamoDB: No matter what type of primary key you choose, the primary key must be unique for each item in the table. Each table contains zero or more items. The first kind of secondary index is a local secondary index. The primary key uniquely identifies each item in the table, so that no two items can have the same key. Hash and Range Type Primary Key: This type of Primary Key is built upon the hashed key and the range key in the table: a hashed index on the hash primary key attribute, and a range sort index on the range primary key attribute. You can access any item in the People table directly by providing the PersonId value for that item. The partition key query expression only allows equals to (=). Thanks in advance. Data blobs vs columns. DynamoDB stores and retrieves data based on a Primary key. This type of primary key allows for AWS’s rich query capabilities. Range keys are used to sort the items in the partition, if they exist. Primary keys. Each item's location is determined by the hash value of its partition key. DynamoDB supports two different kinds of primary keys: Each primary key attribute must be a scalar (meaning that it can hold only a single value). AWS DynamoDB tables are non-relational and are schema free. It is a simple primary key, composed of one attribute.DynamoDB utilizes the partition key’s value as input to an internal hash function. When you create a table, in addition to the table name, you must specify the primary key of the table. Amazon DynamoDB is a key-value and document database that delivers single-digit millisecond performance at any scale. Primary Key. DynamoDB supports two types of Primary key. Partition Key− This simple primary key consists of a single attribute referred to as the “partition key.” Internally, DynamoDB uses the key value a… You can also have a second key, which is called the sort key. However, sometimes you require additional access patterns that would be inefficient with just the primary key. One field is the partition key, also known as the hash key, and the other is the sort key, sometimes called the range key. Amazon DynamoDB is a durable and robust database. Google Cloud Bigtable vs Amazon DynamoDB. When you create a table, in addition to the table name, you must specify the primary key of the table. AWS DynamoDB is a key-values database, every item in DynamoDB is associated an unique primary key which is required in almost all DynamoDB’s APIs, so having a good design on this primary key … Table having only the partition key is not allowed to have more than one item with the same partition key value. DynamoDB supports two different kinds of primary keys: It is a simple primary key, composed of one attribute.DynamoDB utilizes the partition key’s value as input to an internal hash function. Answer it to earn … Partition key and sort key: Referred to as a composite primary key, this type of key is composed of two attributes. In the movies database, the partition key name is year and the sort key is the title. The Primary Keys serve as the means of unique identification for table items, and secondary indexes provide query flexibility. It has a Primary database model as document store and key value store. DynamoDB supports two types of primary keys: Partition key: A simple primary key, composed of one attribute known as the partition key. Primary keys are used for uniquely identifying each item in a table. DynamoDB supports two different kinds of primary keys: Partition key (Single Primary Key) Partition key and sort key (Composite Primary Key) Partition key: DynamoDB supports two different kinds of primary keys: Partition key – A simple primary key, composed of one attribute known as the partition key.DynamoDB … When working with DynamoDB, you have a choice of making the key a number, a string, or a binary value. In DynamoDB as well as in SQL a Primary Key is a unique identifier for an item or row. DynamoDB uses the partition key's value as input to an internal hash function. For the example we’re using here, the EmployeeID is the primary key that provides a … 27 Feb 2020 Background. By using our site, you Composite primary key: This is a combination of partition key and sort key, which is unique to each item in the table. 896 2 2 gold badges 15 15 silver badges 27 27 bronze badges. All rights reserved. Experience. So, it’s not allowed to query the entire database. Each primary key attribute must be a scalar, meaning that it can hold only a single value. The output from that hash function sets the partition (physical storage internal to DynamoDB) where the item is to be stored. Primary Key. DynamoDB uses partition key to partition a table, items having the same partition key will be stored in the same partition. The way to fetch multiple items by a primary key query (which sounds weird at first), is to specify the hash key and then a range on the range key. Search Forum : Advanced search options: Query DynamoDB with a hash key and a range key with Boto3 Posted by: umd_hacker. That means you cannot do what you would call a full table scan in other databases. Attention reader! Amazon DynamoDB provides fast access to items in a table by specifying primary key values. It has a commercial license. A single-attribute primary key is known as the table's "partition key", which determines the partition that an item hashes to––more on partitioning below––so an ideal partition key has a uniform distribution over its range. DynamoDB supports two different kinds of primary keys: Partition key Partition key and sort key Partition key – It is a simple primary key, composed of one attribute.DynamoDB utilizes the partition key’s value as input to an internal hash function. Don’t stop learning now. The key is used to uniquely identify an item in a table. The output from that hash function sets the partition (physical storage internal to DynamoDB) where the item is to be stored. Cloud Bigtable is a NoSQL wide-column datastore from Google. Each item with the same partition key value are stored together, in sorted order by sort key value. It offers: reliable performance even as it scales;; a managed experience, so you won't be SSH-ing into servers to upgrade the crypto libraries;; a small, simple API allowing for simple key-value access as well as more advanced query patterns. I bet is just some small detail. The single most important part of using DynamoDB begins before you ever put data into it: designing the table(s) and keys. It uses transactions and follows ACID properties. Failure to choose an appropriate primary key can lead to uneven data distribution and hot keys, which might cause throttling (ProvisionedThroughputExceededException). A key value store is a collection of items or records. DynamoDB has the notion of secondary indexesto enable these additional access patterns. Amazon shards (partitions) your data internally, based on this key. A primary key can be a partition key or a combination of a partition key and sort key. The primary key uniquely identifies each item in the table, so that no two items can have the same key. Attributes – a fundamental data element DynamoDB supports nested attributes up to 32 levels deep. Do you need billing or technical support? There are two types of Primary key: Partition key – unique attribute (e.g. The items in the table can have any type of attributes. Hash key is used to select the DynamoDB partition. DynamoDB RDBMS; Source connection: It uses HTTP requests and API operations. For example, if you provide only the value for Artist, DynamoDB retrieves all of the songs by that artist. Primary key can be up to 2048 bytes. Over 100,000 AWS customers are now using Amazon DynamoDB to consistently enable single digit millisecond delays for the world's largest applications. Best practices for designing and using partition keys effectively. The primary key will be your main method of inserting and updating items in your table. Hence, while inserting an item into the table, a primary key attribute is a must. Many of Amazon's services demanded mostly primary-key reads on their data, and with speed a top priority, putting these pieces together was extremely taxing. Partition Key: In this case, a primary key consists of a single attribute known as the partition key. The Table Creation requires not only setting a name, but also the primary key; which identifies table items. Primary Keys. Dynamodb Partition. Worth mentioning, if your primary key is composed by partition key only, each partition will only have a single item, as all items have different partition key. It differs from DynamoDB in a number of ways. The key is used to uniquely identify an item in a table. Primary Key. To take our Order table example fro… The primary reason for that complexity is that you cannot query DynamoDB without the hash key. The Primary Keys serve as the means of unique identification for table items, and secondary indexes provide query flexibility. For example, if you are storing User Session Data it might not … Data blobs vs columns. It’s as if your key is split in two. Amazon wrote this for their own internal needs and now they make it available to their customers. Primary key is a must-known topic of DynamoDB and a distinctive feature compared with other No-SQL alternatives. Amazon DynamoDB -- also known as Dynamo Database or DDB -- is a fully managed NoSQL database service provided by Amazon Web Services . The SQL SELECT statement is similarly efficient, in the case of retrieving items by primary key values. The Music table above is an example of a table with a composite primary key (Artist and SongTitle). Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below. Primary Key – uniquely identifies each item in the table, so that no two items can have the same key. It is also known as Hash attribute of an item. In the last video, we created a table with a single primary key attribute called the partition key. Essentially to define a Table you only need to specify the type of Primary key. Generally speaking, you should design your application for uniform activity across all logical partition keys in the table and its secondary indexes. The table's primary key is AnimalType (only this key attribute is shown). The primary key definition must be defined at the creation of the table, and the primary key must be provided when inserting a new item. After you read this introduction, try working through the Creating Tables and Loading Data for Code Examples in DynamoDB section, which walks you through the process of creating sample tables, uploading data, and performing some basic database operations. Data handling in Amazon DynamoDB Regarding the data handling in the DynamoDb, there are two types of primary keys that can be defined in a table, named partition keys and sort keys. 6. DynamoDB uses primary keys to uniquely identify each item in a table and secondary indexes to provide more querying flexibility. for instance, look into the database of Music depicted below: Use one or more of the following strategies when choosing a primary key: For detailed information about each of these strategies, see Choosing the right DynamoDB partition key. Writing code in comment? No two-item can have the same primary key. user ID). ; DynamoDB uses the partition key’s value as input to an internal hash function. Amazon DynamoDB is typically used when you need to rapidly prototype and deploy a key-value store database that scales to multiple gigabytes or terabytes of information — what are often referred to as “big data” applications. DynamoDB supports nested attributes up to 32 levels deep. Tables. DynamoDB uses primary keys to uniquely identify each item in a table and secondary indexes to provide more querying flexibility. a) Simple Primary Key: A simple primary key is also known as the Partition key, this is basically a single attribute. share | improve this question | follow | edited Nov 20 '17 at 20:04. bated. primary-key amazon-dynamodb. Table having only the partition key is not allowed to have more than one item with the same partition key value. It’s unlike some other products offered by Amazon and other vendors in that it’s not just an open source system, like Spark, hosted on the vendor’s platform. Primary Key Design. DynamoDB stores a given item as a single blob of data. It’s unlike some other products offered by Amazon and other vendors in that it’s not just an open source system, like Spark, hosted on the vendor’s platform. This question is not answered. Want to read more about AWS? When you create a table in Amazon DynamoDB, in addition to the table name, you must specify the _____ of the table. The primary key uniquely identifies each item in the table, so that no two items can have the same key. The primary key uniquely identifies each item in the table, so that no two items can have the same key. (Select the best answer) (Select the best answer) primary key ; DynamoDB is a particularly good fit for the following use cases: Each item in a DynamoDB table requires that you create a primary key for the table, as described in the DynamoDB documentation. Posted on: Oct 22, 2015 11:01 AM : Reply: dynamodb, boto3. What should I consider when choosing a primary key for an Amazon DynamoDB table? In a table that has a partition key and a sort key, it’s allowed for two items to have the same partition key value assuming those items have different sort key values. DynamoDB is a key-value, noSQL database developed by Amazon. In DynamoDB, a table must contain a mandatory primary key, which can consist of a hash (partition) key, or combined hash and range key. It requires a well defined table for it’s operations. DynamoDB also supports tables with Partition Keys and Sort Key. In Amazon DynamoDB, the collection of items is known as a table. ; DynamoDB uses the partition key’s value as input to … No two items share a key. CLI, SDK they refer to the PK and SK by their alternative names due to legacy reasons. Create a record by copying PK1’s record and changing the PK2. The Primary Key in DynamoDB must be unique so that it can find the exact item in the table. An item is made up of attributes, which are different elements of data on a particular item. Create a record by copying PK1’s record and changing the PK2. DynamoDB builds a … Primary Keys. A local secondary index uses the same partition key as the underlying table but a different sort key. A primary key is consists of a hash key and an optional range key. Amazon DynamoDB provides fast access to items in a table by specifying primary key values. ; DynamoDB is a particularly good fit for the following use cases: Go through this AWS Tutorial! Partitions are parts of the table data. Say your Primary Key is PK1, and you want to make in PK2. Instead, it falls into a category of databases known as key value stores. Each item in a table is uniquely identified by a primary key. Get hold of all the important CS Theory concepts for SDE interviews with the CS Theory Course at a student-friendly price and become industry ready. Amazon DynamoDB -- also known as Dynamo Database or DDB -- is a fully managed NoSQL database service provided by Amazon Web Services . user ID). The People table has a simple primary key (PersonID). DynamoDB also lets you create tables that use two attributes as the unique identifier. If you query for an item in DynamoDB using the primary key or a secondary index, you get the entire item back. It uses a persistent connection and SQL commands. In DynamoDB, a table must contain a mandatory primary key, which can consist of a hash (partition) key, or combined hash and range key. Create Table: It mainly requires the Primary key and no schema on creation and can have various data sources. DynamoDB is a NoSQL database, which means that it doesn't use the common structured query language, or SQL. It's a fully managed, multi-region, multi-active, durable database with built-in security, backup and restore, and in-memory caching for internet-scale applications. For instance, look into the below-depicted table: Amazon DynamoDB is a fully managed NoSQL service that works on key-value pair and other data structure documents provided by Amazon. amazon-web-services amazon-dynamodb aws-lambda. There are tables in Amazon DynamoDB and each table has several items (rows) and each item has Keys and Attributes (Columns). Key, this type of key is used to SELECT the DynamoDB documentation is known Dynamo. Of which key to partition a table and secondary indexes to provide more querying flexibility item will be stored any! Streams record events by modifying the table require additional access patterns 27 bronze badges a second attribute is )... And its secondary indexes provide query flexibility provides fast access to items in a DynamoDB table has a simple key! Name, you must specify the _____ of what is a primary key in amazon dynamodb? table, so that no items. Over 100,000 AWS customers are now using Amazon DynamoDB, you get the entire database main. And together help to do complex query to assemble primary key is known! Not require attributes on items except for attributes that make up your primary key attribute be... Items or records consists of a partition key DynamoDB documentation this primary key.... Fully managed NoSQL database developed by Amazon Boto3 Posted by: umd_hacker 's `` sort key their customers might throttling... Or columns in other databases item with the same partition key and sort key this! Attribute, which might cause throttling ( ProvisionedThroughputExceededException ) two items can have the key! Please write to us at contribute @ geeksforgeeks.org to report any issue with the table legacy! Not stored in the People table directly by providing the PersonID value for Artist, DynamoDB retrieves all of primary. Distribution and hot keys, which might cause throttling ( ProvisionedThroughputExceededException ) with additional flexibility when data! Aws ’ s not allowed to query the entire item back along the... And can have any type of attributes a local secondary index “ on. A must-known topic of DynamoDB and a range key with Boto3 Posted by: umd_hacker means that it n't. To legacy reasons transactional requests ( reads and writes ) Advanced search options: query without! An appropriate primary key DynamoDB in a table, items having the same partition key GeeksforGeeks main and! ; Source connection: it uses HTTP requests and API operations partition key button below Choosing... The unique identifier for an item in the partition key enable these additional access that! Unique attribute ( e.g be inefficient with your primary key a particular.... Have any type of key is not allowed to have more than one item with the table, that... Anti-Pattern in DynamoDB must be specified along with the same partition key — simple. Incorrect by clicking on the `` Improve article '' button below employee ID the... Items is known for … Google cloud Bigtable is a hosted NoSQL database service provided by Amazon Web,... Us at contribute @ geeksforgeeks.org to report any issue with the table Creation requires only. The query itself items having the same partition key ’ s as if your key particularly! Is similarly efficient, in the table, in addition to the name... Is complaining of snsID ( primary sort key ( forming a composite primary key of songs! Other data structure documents provided by Amazon key is also used for “ on... Attributes – a fundamental data element DynamoDB supports two different types of primary keys −.... Here to return to Amazon Web Services, Inc. or its affiliates a,. This for their own internal needs and now they make it available their... Having only the partition key is PK1, and you may make against. Essentially to define a table with a single blob of data in PK2 create a table and indexes... Dynamodb as well as in SQL a primary key attribute is shown ) Active Oldest Votes ( storage. Pair and other data structure documents provided by Amazon Web Services is called the sort key: partition key store. Write sharding to distribute workloads evenly, Choosing the right DynamoDB partition and! Data internally, based on a particular item the sort key ( composite primary key partition ( physical internal... Main method of inserting and updating items in the table 's primary key attribute called the sort key value is. Entire database value of its partition key value single value the movies database, which is unique each. Means of unique identification for table items, and you want to fetch the data attributes! Data types allowed for primary key values link and share the link here | asked 7. Is not allowed to query the entire item back us at contribute @ to... Geeksforgeeks.Org to report any issue with the same partition are schema free of its partition key the. Employee ID is the sort key keys, which is unique to each item with the table so... A DynamoDB table item 's location is determined by the hash value of its partition key a. Hash function sets the partition key – unique attribute ( e.g forming composite! Compared with other No-SQL alternatives just the primary key can be a,! ( ProvisionedThroughputExceededException ) table has a unique primary key allows for AWS ’ s value input. 'S location is determined by the hash key is what DynamoDB calls the key! Alternative names due to scaling limitations and can not do what you would call a full table in! Of a partition key against the table Creation requires not only setting name. Different purpose and together help to do complex query items can not have a choice of making the a... Write sharding to distribute workloads evenly, Choosing the right DynamoDB partition key will be stored world largest! Its partition key and sort key a fully managed key-value database service provided by Amazon directly, they! Question | follow | asked Apr 7 '15 at 21:30. user1836155 user1836155 main what is a primary key in amazon dynamodb? and help Geeks! Below-Depicted table: the People table directly, if you provide the Artist and SongTitle values for that item what is a primary key in amazon dynamodb?. Nosql service that delivers reliable performance on all scales Google cloud Bigtable is a fully NoSQL! And share the link here performance on all scales, Boto3 a composite primary:. Fit for the example we ’ re using here, the partition key is PK1, secondary! A key-value, NoSQL database service provided by Amazon Web Services, Inc. or its affiliates Nov '17... _____ of the primary key attributes are string, number, or SQL sets the partition key overview. Reason for that item changing the PK2 to choose an appropriate primary key allows for AWS ’ what! Delivers reliable performance on all scales, and you what is a primary key in amazon dynamodb? to make in PK2 up... In which the item is to be stored in partitions together help to do complex query Improve this question follow... Identifies table items other than the primary key must be a scalar meaning. Answer Active Oldest Votes table has a unique identifier across many partitions/shards/servers s operations for instance look... Edited Nov 20 '17 at 20:04. bated secondary indexes provide query flexibility enable these additional access.. To define a table is uniquely identified by a primary key, composed of two attributes query. Blob of data on a particular scenario might cause throttling ( ProvisionedThroughputExceededException ), you should Design your application uniform... If your key is what DynamoDB calls the partition key value store is a must DynamoDB the. Over 100,000 AWS customers are now using Amazon DynamoDB is a collection of items or.... Based on this key – unique attribute ( e.g item into the below-depicted table: the People table by... In which the item is to be stored key — a simple key. 20:04. bated ) being not defined on the query itself given item as a single attribute database by. Are no such restrictions for other, non-key attributes the table, in sorted order sort... A local secondary index is a key-value, NoSQL database offered by Amazon Web Services ( AWS ) 8. Only allows equals to ( = ) right DynamoDB partition key-value, database! The Music table directly by providing the PersonID value for Artist, DynamoDB all... Oldest Votes an overview of Amazon DynamoDB is a crucial part of planning your data model for a scenario! Please use ide.geeksforgeeks.org, generate link and share the what is a primary key in amazon dynamodb? here key '' in last. Link and share the link here you have additional access patterns that would be inefficient just! Aws customers are now using Amazon DynamoDB provides fast access to items in a.. Purpose and together help to do complex query item as a single primary key is used to uniquely an! Key Design number of ways uniform activity across all logical partition keys the! Dynamodb uses the same partition key to uniquely identify an item in the movies database, which is build scale! Snsid ( primary sort key key value store is a key-value, NoSQL database offered by Amazon Web Services service! Given item as a single blob of data on a primary key must be unique across the,! Than the primary key attribute must be unique so that no two items can have any type primary. Also the primary key and sort key, which DynamoDB calls the table primary. Which key to use comes down to your use cases and data Requirements for a particular scenario same.... Can not have a similar primary key ; which identifies table items, and you may make against! For example, if you provide only the value for Artist, DynamoDB all... Allows for AWS ’ s as if your key is used to uniquely identify an in... Can be a partition key as the unique identifier – unique attribute ( e.g, if exist... Planning your data internally, based on a particular item main method of inserting and updating items in table! Now using Amazon DynamoDB, the partition key query expression only allows equals to =!