dynamodb uuid as sort key

How is an HTTP POST request made in node.js? If you have any question, feel free to ask. Generally speaking, you should design your application for uniform activity across all logical partition keys in the table and its secondary indexes. I have some computers (real hardware) out in the field that are sending events into a DynamoDB table. It's nice, but now I'm using a timestamp and random numbers. If that conditional PutItem failed, it means someone else was doing this at the same time as you were. Do a PutItem on NextIdTable to set the value of Counter to curValue + 1. I wrote some examples in dynamodb-mapper's documentation and it can easily be extrapolate to Node.JS. Next, examine some command-line examples for implementing this design. Host A acquires the lock with a revision version number (RVN) of UUID 1. Then click Create Table and specify the name and the primary key of your table. attributes. How to set new item's attribute as (from the max amongst all items incremented by n)? Only String properties can be marked as auto-generated Because a single transaction can modify more than one table, it is possible to implement this same pattern using two tables. The following are 30 code examples for showing how to use boto3.dynamodb.conditions.Key().These examples are extracted from open source projects. to insert {id: data.Attributes.order_number, otherfields:{}} into order table. Explain for kids — Why isn't Northern Ireland demanding a stay/leave referendum like Scotland? This would result in a data loss. For example, in Node: npm install uuid Marks a partition key or sort key property as being auto-generated. See this blog post, that explains how I'm using stateful.co with DynamoDB in order to simulate auto-increment functionality: http://www.yegor256.com/2014/05/18/cloud-autoincrement-counters.html. I generate my own UUID in PHP which does the job, I'm sure you could come up with something similar like this in javascript. There is one remaining problem: where to store the last ID value ? DynamoDB guarntees ordering across aggregate’s using a sort key which makes it possible to use it as an event store. If no sort key is used, no two items can have the same partition key value. The sort key value adheres to the following template: v_# where # is the version ID or document version number. Instead, provide the last result of the previous query as the starting point for the next query. Overloading the UUID in this way makes you dependent on generating UUIDs correctly so that the ordering works. This concept is similar to a table in a relational database or a collection in MongoDB. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. How acceptable is it to publish an article without the author's knowledge? If it succeeded, then curValue is your new unique ID. First, open the service DynamoDB. site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. As seen in the previous post, scanning the whole table to get all items with all attributes is a simple SELECT * FROM: Each merchant can create multiple retail stores and later get single item by primary and sort key. IMO you are more likely to experience errors consolidating primary key counters across highly available DynamoDB tables than from clashes in generated UUIDs. For example, " a " (0x61) is greater than " A " (0x41), and " ¿ " (0xC2BF) is greater than " z " (0x7A). Attributes #[derive(Item)] Used to define a top-level DynamoDB item. DynamoDB is a NoSQL database. Register your first user by inserting their three rows as part of a transaction and use a transaction identifier to ensure idempotency. However, DynamoDB does not have a built-in mechanism for ensuring the uniqueness of attributes that are not the primary key. In your Users table, an item wou… Only String properties can be marked as auto-generated keys. How can I uninstall npm modules in Node.js? Keep your “main data” in the User table and have a second table, which is used purely for the purpose of ensuring uniqueness on certain attributes. Tables, items, and attributes are the core building blocks of DynamoDB. More Info on Universal Unique Identifier Specification could be found here. As in the code above, use dynamodb.get to set your table and partition key Key.id from the request parameters. Most relational database systems—and some non-relational database systems—have a construct known as a unique key or a unique constraint. To learn more about DynamoDB, see this helpful guide.. Data Modeling. When you do an insert, you ask to Redis the current counter and increase it. This post describes a pattern that is used to implement this kind of uniqueness from the application side. Table that has both a partition key and a sort key. Similarly, if you delete an item, you must delete the other two corresponding items. This automatically derives Attributes too.. For the Order struct from the example higher this will generate an OrderKey struct like this: #[derive (Attributes)] struct OrderKey { user: Uuid… Why do electronics have to be off before engine startup/shut down on a Cessna 172? DynamoDB uses the partition key value as input to an internal hash function. For a composite primary key, the maximum length of the second attribute value (the sort key) is 1024 bytes. System admins (in my case: merchants) creates item (retail store) with cognitoUserId as a primary key and uuid as a sort key. Multiple people might share the same home phone number. Stack Overflow for Teams is a private, secure spot for you and DynamoDBMapper generates a random UUID when saving these attributes. Host B tries to get a lock on Moe with a RVN UUID 2. @Mirage last 1000 days stats from statuscake.com: https://bitbucket.org/Ludia/dynamodb-mapper/src/8173d0e8b55d/dynamodb_mapper/model.py#cl-67, http://docs.aws.amazon.com/AWSJavaScriptSDK/latest/frames.html#!AWS/DynamoDB.html, http://www.yegor256.com/2014/05/18/cloud-autoincrement-counters.html, How to use auto increment for primary key id in dynamodb, DynamoDB auto incremented ID & server time (iOS SDK), Creating “users.id_users” on DynamoDB and PHP. A tableis a grouping of data records. Incase you are using NoSQL DynamoDB then using Dynamoose ORM, you can easily set default unique id. awsRequestId looks like its actually V.4 UUID (Random), code snippet below to try it: In case you want to generate this yourself, you can use https://www.npmjs.com/package/uuid or Ulide to generate different versions of UUID based on RFC-4122. In an Amazon DynamoDB table, the primary key that uniquely identifies each item in the table can be composed not only of a partition key, but also of a sort key. Another approach is to use a UUID generator for primary keys, as these are highly unlikely to clash. Was the storming of the US Capitol orchestrated by the Left? In Amazon DynamoDB, the primary key is either the partition key (if no sort key is chosen for the table), or the combination of the partition and sort key. DynamoDB collates and compares strings using the bytes of the underlying UTF-8 string encoding. The new table looks like the following example: Every time that you insert a new item into the table, you also must insert the other two items. All rights reserved. The sort key value v_0 is reserved to store the most recent version of the document and always is a duplicate row of whatever document version was last added. Primary keys are guaranteed to be unique within a table. Why are diamond shapes forming from these evenly-spaced lines? Similarly, when Bobby wants to delete himself from the internet, you must remove all three rows related to his user. Because DynamoDB already guarantees that the pk attribute is unique, you need a mechanism to ensure that the userName and email attributes are also unique. How stable is this to be used in production? And for some reporting or to export data, you may scan, which is expensive (in time and RCU) but not done frequently. Thus, there might appear some unused incremented values. rev 2021.1.15.38327, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide. The version will be an auto-generated uuid and the creation date will be the date/time of the entry creation. 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). Optionally, you can provide a sort key attribute and use a comparison operator to refine the search results. This feature ensures that all values in a column or field are unique across rows. Prior to joining Amazon he held similar roles at Red Hat, Cloudera, MongoDB, and Elastic. If you're okay with gaps in your incrementing id, and you're okay with it only roughly corresponding to the order in which the rows were added, you can roll your own: Create a separate table called NextIdTable, with one primary key (numeric), call it Counter. For Go developers, you can use these packages from Google's UUID, Pborman, or Satori. How can I update NodeJS and NPM to the next versions? Use the DynamoDBAutoGeneratedKey annotation like this. Key (required field): The query response should return each item with its primary key (a UUID in my case), so now this information can be easily referenced to update each item PS For access to DynamoDB, I use dynode, module for Node.js. Using a counter for a distributed load, even with the "ALL_NEW" flag implies more RCU consumption. Create the new file.js and put this code: Then you can apply this function to the primary key id. Most of the time… PS Big thanks for this great answer, and thanks for improvement DynamoDB. (PS. 4. But it does give you a rough ordering. As you can see, this transaction fails because the third element in the transaction received a ConditionalCheckFailed error as there was already an item existing with the pk value of “email#bobby.tables@gmail.com”. For example: For implementation details (Python, sorry), see https://bitbucket.org/Ludia/dynamodb-mapper/src/8173d0e8b55d/dynamodb_mapper/model.py#cl-67. In this case, host B finds that host A holds a lock on Moe with a record version number (RVN) of UUID 1. PC ATX12VO (12V only) standard - Why does everybody say it has higher efficiency? Imagine that you have a user table and it’s empty. http://docs.aws.amazon.com/AWSJavaScriptSDK/latest/frames.html#!AWS/DynamoDB.html. This transaction identifier (the client request token) allows you to submit an identical transaction more than one time, perhaps in the case of a restarted or resumed application, and still end up with the same result. Well-designed sort keys have two key benefits: They gather related information together in one place where it can be queried efficiently. Auto Increment is not good from performance perspective as it will overload specific shards while keeping others idle, It doesn't make even distribution if you're storing data to Dynamodb. How would I create a stripe on top of a brick texture? Make this a conditional PutItem so that it will fail if the value of Counter has changed. For the database schema we will use the Id as the HASH key and the creationDate as the RANGE key. Some samples rows follow. If your table does not have one, your sorting capabilities are limited to sorting items in application code after fetching the results. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. Each item in a table is uniquely identified by the stated primary keyof the table. The "uuid" npm package usage is a nicer, faster and cheaper solution. import boto3 import dynamodbgeo import uuid dynamodb = boto3. … Create a separate table (order_id) with a row holding the latest order_number: This will allow to increment order_number by 1 and get the incremented result in a callback from AWS DynamoDB: Be aware that in some rare cases their might be problems with the connection between your caller point and AWS API. Now, if you list the items, you can see that all three items have been created. Another workaround would be to use Redis counter, so you reduce A LOT the stress and operations to DynamoDB. This guarantees uniqueness for the userName and email attributes. The Query operation in Amazon DynamoDB finds items based on primary key values. If redis does not have the counter, it ask DynamoDB the latest ID, and then store it. Supports random id generation for UUID (can be overriden to user generated) Test framework under the XCTDynamo folder (use in your tests by importing the package as a dependency) Custom encoder and decoder to convert Codable types to types that aws-sdk-swift expects. Are there "typical" formal systems that have mutual consistency proofs? Simulating Amazon DynamoDB unique constraints using transactions. Why would a flourishing city need so many outdated robots? Primary sort key timestamp (String) Epoch Time event received For todosApi we only have a partition key, if you have a composed key (partition key + sort key) include the sort key too as part of the Key… What are the uptime stats? It will generate the UUID. This use case was mentioned in the AWS Summit 2018 DAT374 Session on DynamoDB Transactions. Each time you want to generate a new id, you would do the following: Of course, if your process crashes before actually applying that ID anywhere, you'll "leak" it and have a gap in your sequence of IDs. Contribute to mitchallen/marchio-lambda-get development by creating an account on GitHub. For example, you might have a Users table to store data about your users, and an Orders table to store data about your users' orders. Check synchronously if file/directory exists in Node.js. Is there a security reason to require email address and password in separate steps? your coworkers to find and share information. I've had the same problem and created a small web service just for this purpose. Its value must be specified by you (hash-range pairs must be unique). DynamoDBMapper will generate a random UUID when saving these NoSQL databases are purpose-built for specific data models and have flexible schemas. You can get insertion ordering by using an auto-increment integer primary key which also results in a relatively short key for secondary indexes. The output from the hash function determines the partition in which the item will be stored. A final scan shows that the table is now empty: This pattern may be useful to you if you are migrating from relational databases and must maintain uniqueness constraints in DynamoDB. For example, if you have a User table, you might have a UUID as a primary key that uniquely identifies each user, but you might also have user name and email fields (“attributes” in DynamoDB … For the curious other cloud based NoSQL databases on Azure and Google do not support the same ordering guarantees which make them unsuitable for event stores making DynamoDB unique for this usecase. How I can realize this feature? Intuitive workflow of an auto-increment key: This is just to explain the underlying idea. Start over. Prior to joining AWS, Brett served in a number of technical roles at companies such as Kimball Electronics, Maxim Group, BMG Columbia House, and Hearst Health subsidiary fdb (First DataBank). The following example demonstrates using autogenerated keys. Contribute to mitchallen/marchio-lambda-put development by creating an account on GitHub. You must provide the name of the partition key attribute and a single value for that attribute. System users (buyers) can … These CLI examples can be easily ported to any of the DynamoDB SDKs for your preferred programming language. DynamoDBAutoGeneratedKey Marks a partition key or sort key property as being auto-generated. Unfortunately, DynamoDB offers only one way of sorting the results on the database side - using the sort key. Having worked in the industry over 20 years supporting  manufacturing, retail, healthcare, and government, Brett serves to assist customers in navigating the various technical, cultural, and procedural challenges in order to better serve their businesses, customers, or constituents. As you can see in the example above, you can apply both the DynamoDBAutoGeneratedKey and DynamoDBHashKey annotation to the same attribute to generate a unique hash key. The Attribute type provides conversion interfaces to and from Rust's native scalar types which represent DynamoDB… We try to maintain the single table design concept wherever possible in DynamoDB, but if using two tables for this pattern makes you feel more comfortable, go for it! How do I pass command line arguments to a Node.js program? The table is set up like so: Primary partition key Id (String) This is unique uuid for no good reason? Finally, if you modify one of the unique attributes (such as in the case where the user wants to change their email address on their account), you must update the related unique items as well. The service is free. He works with large enterprises to evaluate, design, and deploy DynamoDB-based solutions. Here is the simple user creation example. This feature ensures that all values in a column or field are unique across rows. We show you examples of how to create, update, and delete items when using this pattern in a single-table schema design. Careful design of the sort key lets you retrieve commonly needed groups of related … But because DynamoDB doesn’t allow you to modify the primary key of an item, you must delete the unique email item and insert another item with the new email. A scan shows that the intended changes were made. range key = sort key) Choose the primary key carefully. Dynomite is the set of high-level interfaces making interacting with AWS DynamoDB more productive. And if you're doing this concurrently with some other process, one of you will get value 39 and one of you will get value 40, and there are no guarantees about which order they will actually be applied in your data table; the guy who got 40 might write it before the guy who got 39. The old item will remain unchanged! Query returns all items with that partition key value. Dynomite adapts Rust's native types to DynamoDB's core components to form a coherent interface.. To do this, insert extra items into the same table, with the pk attribute set to the attribute name and value from the item, delimited by a hash sign. If little Bobby Tables wants to register a vanity domain and change his stored email address, you must only modify two items. You will also need to build a new DynamoDB table, paying attention to name it precisely as you did in the Lambda code. An error occurred (TransactionCanceledException) when calling the TransactWriteItems operation: Transaction cancelled, please refer cancellation reasons for specific reasons [None, None, ConditionalCheckFailed]. Using the preceding example, imagine that you have a User table and that table has attributes like the following: The UUID, userName, and email attributes must be unique, but fullName and phoneNumber do not. The name of the attribute storing the range key, used as the range (aka sort) part of a hash/range key primary key pair. An item is a single data record in a table. All of these modifications should be bounded together in a DynamoDB Transaction so that either they all succeed or fail together. It will result in the dynamodb row being incremented, while you will get a connection error. You can use incremented data.Attributes.order_number in your table, e.g. REST GET from DynamoDB via Lambda. transaction identifier to ensure idempotency. timestamp (sort key) deviceId (secondary index's partition key) deviceName (secondary index's sort key) However, from the web application, there is definitely no way to get access to the snapShotId (which is uuid-generated) to use it in querying data, as well as the deviceId. IMO you are more likely to experience errors consolidating primary key counters across highly available DynamoDB tables than from clashes in generated UUIDs. Under certain workload, you may allocate the same ID to 2+ different objects because it's not atomic. Are different eigensolvers consistent within VASP (Algo=Normal vs Fast). keys. Most relational database systems—and some non-relational database systems—have a construct known as a unique key or a unique constraint. Which was the first sci-fi story featuring time travelling where reality - the present self-heals? For example, if you have a User table, you might have a UUID as a primary key that uniquely identifies each user, but you might also have user name and email fields (“attributes” in DynamoDB terminology), which also must be unique for that user. Generates a Key struct with only partition_key/sort_key fields to be used for type-safe primary key construction. You cannot change the primary key once the table is created, and then you'll have to deal with migrating your data to a new table; When you update an item via PutItem, DynamoDB will create a new entry if the primary key has changed. Pborman is better in performance, check these articles and benchmarks for more details. DynamoDB. Marks a partition key or sort key property as being autogenerated. Basically, you register an atomic counter at stateful.co and increment it every time you need a new value, through RESTful API. What city is this on the Apple TV screensaver? Unfortunately, offset of how many records to skip does not make sense for DynamoDb. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. All items with the same partition key are stored together, in sorted order by sort key value. Disclaimer: I am the maintainer of the Dynamodb-mapper project. The solution is to use the atomic ADD operation along with ALL_NEW of UpdateItem: In the worst case scenario, the application crashes before the object is saved but never risk to allocate the same ID twice. What is the purpose of Node.js module.exports and how do you use it? Click here to return to Amazon Web Services homepage. Table.GetItem(Primitive partitionKey, Primitive sortKey, GetItemOperationConfig config); You can use the configuration object to specify several optional parameters such as request a specific list of attributes or specify the page size (number of items per page). We chose: Of course, to work reliably, all applications inserting data MUST be aware of this system otherwise you might (again) overwrite data. Do it this way because it 's not atomic by creating an account on GitHub cookie... Records to skip does not have the same time as you did in the AWS 2018! Built-In mechanism for ensuring the uniqueness of attributes that are sending events into a DynamoDB transaction so it... Say it has higher efficiency specify the name of the entry creation ) out the! And Elastic function determines the partition in which the item will be.. Might appear some unused incremented values NextIdTable to set the value of counter to +! Single value for that attribute, there might appear some unused incremented values ) is 1024 bytes enterprises evaluate. Because the tables are partitioned across multiple machines writing great answers and put this:... Time… import boto3 import dynamodbgeo import UUID DynamoDB = boto3 Services, Inc. or its.. The time… import boto3 import dynamodbgeo import UUID DynamoDB = boto3 in a or... Most of the previous query as the range key I use dynode, module for.! Key Key.id from the hash function mitchallen/marchio-lambda-put development by creating an account on GitHub have some computers ( real )! You should design your application for uniform activity across all logical partition keys in U.S.. It precisely as you did in the Lambda code how acceptable is it to publish article... A partition key or a unique constraint the U.S. is italicizing parts of dialogue for emphasis ever appropriate DynamoDB. Brick texture these attributes if it succeeded, then curValue is your new unique ID update, build... Up using the sort key is used to define a top-level DynamoDB item UUID for no reason. Is a nicer, faster and cheaper solution might share the same to. Services homepage the current counter and increase it code examples for implementing this design way because 's. These are highly unlikely to clash / logo © 2021 Stack Exchange Inc user. Click create table and it can easily set default unique ID if little Bobby wants. The sort key ) is 1024 bytes offers only one way of sorting the results higher efficiency what city this., dynamodbmapper can now generate unique UUIDs on your behalf Tindel is a 27 characters long String combines! Only partition_key/sort_key fields dynamodb uuid as sort key be used for type-safe primary key counters across highly available DynamoDB than. Id or document version number just to explain the underlying idea references personal. Share information would be to use it for access to DynamoDB, see https: //bitbucket.org/Ludia/dynamodb-mapper/src/8173d0e8b55d/dynamodb_mapper/model.py # cl-67 of... Sorted order by sort key ) Choose the primary key construction why does everybody say it has higher?. Items incremented by n ) and attributes are the core building blocks of DynamoDB or field are unique rows! Define a top-level DynamoDB item another workaround would be to use a UUID for. Nodejs and npm to the following template: v_ # where # is the set of interfaces! Internal hash function determines the partition key are stored together, in Node: npm install UUID item! But now I 'm using a timestamp and an additional random key attributes! Guaranteed to be used in production the core building blocks of DynamoDB ©! Related to his user B tries to sign up using the sort key used. Phone number items incremented by n ) workload, you must only modify two items overloading the UUID in way. Stated primary keyof the table SDKs for your preferred programming language return to Amazon Web homepage. For primary keys, as these are highly unlikely to clash for Teams is DynamoDB. Range key ORM, you must provide the last result of the entry creation Session DynamoDB. Latest ID, and delete items when using this pattern in a relational database or a key! Create table and partition key value schema we will use the ID as the hash key and the date... Increase it to Redis the current counter and increase it name it precisely as you did in the field are... Name and the primary key counters across highly available DynamoDB tables than from clashes in generated.... Is an http post request made in Node.js are detailed here and benchmarks for more.... Detailed here or Satori my db scheme, I use dynode, module Node.js... Parameters for a composite primary key, the maximum length of the partition in which the item will the... It 's not atomic ID value found here good reason using the bytes of underlying! Databases are purpose-built for specific data models and have flexible schemas attention name..., no two items this pattern in a DynamoDB table, an is. Then using Dynamoose ORM, you dynamodb uuid as sort key see that all values in a.. Dynamodb table, an item is a 27 characters long String that combines timestamp! Or field are unique across rows, or Satori allocate the same time as did! Incremented by n ) of a brick texture of DynamoDB table in relatively... Implement this kind of uniqueness from the request parameters document version number attribute. Person who wants to please everybody, but sort of in an obsessed manner purpose of Node.js module.exports and do. Dynamodb transaction so that it will result in the code above, use dynamodb.get to set value! Make sense for DynamoDB systems—and some non-relational database systems—have a construct known as a unique key or a unique.. With the primary key, the maximum length of the second attribute value the... Of service, privacy policy and cookie policy a coherent interface bytes of the partition in which the item be., copy and paste this URL into your RSS reader based out of new York.!, copy and paste this URL into your RSS reader composite primary key and put this code: you! Highly unlikely to clash only ) standard - why does everybody say it has higher efficiency to a! Code: then you can use these packages from Google 's UUID,,! Create a stripe on top of a transaction Identifier to ensure idempotency from. Click here to return to Amazon Web Services, Inc. or its affiliates the max all! Item 's attribute as ( from the max amongst all items with the `` ALL_NEW '' implies... Where to store the last result of the entry creation.These examples are from... Range key database systems—and some non-relational database systems—have a construct known as a unique constraint DynamoDB uses the partition attribute. A new DynamoDB table, an item wou… attributes # [ derive ( item ) ] used to this! Key.Id from the internet, you must delete the other two corresponding items you were unique across.. Is italicizing parts of dialogue for emphasis ever appropriate case was mentioned in U.S.. Same home phone number UTF-8 String encoding the userName and email attributes language! Do you use it UUIDs correctly so that the intended changes were dynamodb uuid as sort key documentation... A conditional PutItem request might look like this would a flourishing city need so outdated! And thanks for improvement DynamoDB auto-increment key: this is just to explain the underlying UTF-8 encoding... Share information access to DynamoDB 's core components to form a coherent interface type-safe... For your preferred programming language insert { ID: data.Attributes.order_number, otherfields: { } } into table! This a conditional PutItem in Node.js are detailed here your new unique.. Overloading the UUID time-swapping trick seems like a bad idea outside of cases! Primary keyof the table Services homepage saving these attributes in sorted order by sort key makes... Increment it every time you need a autoincrement primary key counters across highly available DynamoDB tables than from clashes generated... Value ( the sort key ) Choose the primary key item is a single transaction can modify more than table... Creation date will be an auto-generated UUID and the creation date will be stored copy and this! Your behalf some command-line examples for implementing this design these can we build how I 'm using with... An item, dynamodb uuid as sort key can easily set default unique ID 's UUID, Pborman, responding. > key struct with only partition_key/sort_key fields to be off before engine startup/shut down on a Cessna?! People might share the same problem and created a small Web service just for this great,. The time… import boto3 import dynamodbgeo import UUID DynamoDB = boto3 as are... The US Capitol orchestrated by the stated primary keyof the table and its secondary indexes have two key benefits They. Item is a 27 characters long String that combines a timestamp and random numbers,... Is what happens if a lock on Moe with a RVN UUID 2 the of... Answer ”, you should design your application for uniform activity across all logical partition keys in the code,! Native types to DynamoDB, see our tips on writing great answers appear some incremented... The tracks on the Apple TV screensaver query as the starting point for the next versions partition_key/sort_key fields to used. Database side - using the bytes of the US Capitol orchestrated by the Left latest ID, and your. Versioning with DynamoDB in order to simulate auto-increment functionality: http:.. ) is 1024 bytes a < ItemName > key struct with only partition_key/sort_key to... Request made in Node.js stateful.co with DynamoDB about DynamoDB, I need a autoincrement primary key ID from Google UUID... Unique key or a collection in MongoDB point for the next versions which was first... Can provide a sort key ) Choose the primary key of your table does not make for. Question, feel free to ask results in a relational database or a collection in.!
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