Stream records have a lifetime of 24 hours, after that, they are automatically removed from the stream. Stream records can be configured what data to hold, they can have the old and the new item, or only one of them if needed, or even only the keys.
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CONNECT TO LOCAL DYNAMODB UPDATE
Each event is represented by a stream record in case of add, update or delete an item. The data about different DynamoDB events appear in the stream in near-real-time, and in the order that the events occurred. StreamsĭynamoDB Streams is an optional feature that captures data modification events in DynamoDB tables. Properly managing those indexes is the key to using efficiently DynamoDB as a storage unit. Up to 5 local secondary indexes per table are allowed. A local index is one that has the same partition key but different sorting key. A global secondary index is a one that has a partition, a HASH, key different than the HASH key or the table, each table has a limit of 20 global indexes. Secondary indexesĭynamoDB offers the possibility to define so-called secondary indexes. DynamoDB stores items with the same partition key physically close together, in sorted order by the sort key value. The primary key can also consist of the partition key and sort key (RANGE), which is complementary to the partition. DynamoDB uses an internal hash function to evenly distribute data items across partitions, based on their partition key values. The primary key can consist only of a partition key (HASH), it is mandatory. When a table is created, along with its name, a primary key should be provided. The data is represented as items, which have attributes. DynamoDB tablesĭynamoDB stores data in tables. It’s a fully managed, multi-region, multi-master, durable database with built-in security, backup and restore, and in-memory caching for internet-scale applications. AWS DynamoDBĪmazon DynamoDB is a key-value and document database that delivers single-digit millisecond performance at any scale. It can query large data volumes faster than conventional relational databases.Ī very good article on the NoSQL topic is NoSQL Databases Explained.
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Key-value stores – every single item in the database is stored as an attribute name (or ‘key’), together with its value.There are several types of NoSQL databases: NoSQL database provides a mechanism for storage and retrieval of data that is modeled in means other than the tabular relations used in relational databases (RDBMS). In the current post, I give an overview of DyanmoDB and what it can be used for.
CONNECT TO LOCAL DYNAMODB CODE
The code used for this series of blog posts is located in GitHub repository. This post is part of AWS examples in C# – working with SQS, DynamoDB, Lambda, ECS series. Post summary: Introduction to NoSQL, introduction to DynamoDB and what are its basic features and capabilities.