18 Feb

Data Lake vs Data Warehouse: Whats the Difference?


To cater this, source data is cleansed and processed before loading into the data warehouse. First off, data warehouses typically store relational data, which is structured. There are tables in a data warehouse and those tables have relationships and can follow data models like snowflake or star schema. In its basic form, a data lake is nothing but a huge pool of storage where data can be saved in its native, unprocessed form, without any transformation applied.

Data warehouses can eliminate the preparation step, which can save even more time and lead to better, more refined analytical results. Data lakes benefit more from big data technologies, particularly those that can enhance data lake analytics. Programs like Hadoop can process large quantities of data in any format, promoting the adaptability and scalability of a data lake.

When to use a data lake vs. a data warehouse?

Data warehouses use an extract, transform and load process to verify the integrity of the data and store it in a common format. Data lakes, on the other hand, use a schema-on-read process that cleans, validates and processes data through streaming pipelines. Data warehouses store data in a structured format, while data lakes keep data in a flat architecture. Data warehouses provide quick performance due to their standard underlying data structure, while data lakes are more complex when it comes to queries. Data scientists and engineers typically use data lakes for quick storage without transformation and for later data use for research and testing. This characteristic enables a data lake to accept unstructured data, whereas a data warehouse can only accept structured data from multiple sources.

data lake vs data warehouse

Metadata management, data cataloging, and proper security measures are crucial for maintaining the health of a data lake. Multiple users and projects require the data stored in data warehouses. Hence, warehouses often have a longer lifespan and are more complex in nature.

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Because data in a data warehouse is already processed, it’s relatively easy to do high-level analysis. Business managers and other workers who aren’t skilled data or analytics professionals can use self-service BI tools to access and analyze the data on their own. An enterprise data warehouse provides a centralized data repository for an entire organization, while smaller data marts can be set up for individual departments.

data lake vs data warehouse

For example, data from a data warehouse might be fed into a data lake for deeper analysis by data scientists. But let’s look more closely at the two data stores and the differences between them. Databases, data warehouses, and data lakes each have their own purpose. data lake vs data warehouse Nearly every modern application will require a database to store the current application data. Organizations that want to analyze their applications’ current and historical data may choose to complement their databases with a data warehouse, a data lake, or both.

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The warehouses perform functions on the data such as extraction, cleaning, transformation, and more. In data lakes, the schema or data is not defined when data is captured; instead, data is extracted, loaded, and transformed for analysis purposes. Data lakes allow for machine learning and predictive analytics using tools for various data types from IoT devices, social media, and streaming data. As an individual employee in a company, you typically care most about what happens within the scope of your immediate team. So you’ll likely use databases to store information about your team or your team’s services and applications.

However, finding the best option to suit your needs is not an easy task, and it may involve several different types of repositories for different categories of data. Data warehouses have a rigorous schema, so loading data into them is more complex. However, once in the data warehouse, the data is easy to retrieve. If you have any questions or would like to further discuss data platform architecture, feel free to reach out to me on LinkedIn. The upcoming Delta Lake 3.0 aims to provide a Universal Format for all three OTF. The objective would be to have Delta Lake tables accessible as Hudi or Iceberg tables.

Key benefits of data warehouses

As a result, users can scale CPU resources according to user activities. Big data technologies like Hadoop Distributed File System are used to boost the impact of Data lakes on analytics. HDFS shows easy adaptability and scalability for vast volumes of data of any type of structure. Plus, Hadoop supports data warehouse scenarios by applying structured views to raw data. This flexibility makes Hadoop an excellent choice for providing data and insights to every tier of business users.

  • Microsoft Azure – it is a node-based platform that allows massive parallel processing, which helps extract and visualize business insights much quickly.
  • Other data not ending up in DWH will still be retained, and they may be loaded into other systems for further analysis.
  • An enterprise data warehouse provides a centralized data repository for an entire organization, while smaller data marts can be set up for individual departments.
  • Data warehouses provide quick performance due to their standard underlying data structure, while data lakes are more complex when it comes to queries.
  • A data warehouse stores current and historical data from one or more systems in a predefined and fixed schema, which allows business analysts and data scientists to easily analyze the data.
  • Hopefully, now you have a better understanding of when to use each and how they all fit together to unlock the full potential of your data.
  • In this era of data democratization, everyone across the organization needs quick and easy access to trusted data.

Learn more about data lakes, the benefits of moving them to the cloud and key industry use cases. Learn more about data warehouses, the benefits of moving them to the cloud and key industry use cases. Not only is data distributed across siloed applications, but now it is physically stored in different clouds. Traditional and siloed databases were the original repositories for storing and managing data. Fast-forward a decade, and organizations could only go so far with the large amount of information generated day to day and minute to minute.

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This iframe contains the logic required to handle Ajax powered Gravity Forms. One of the key factors in https://www.globalcloudteam.com/ is the choice of tools and software. Once data is entered into the warehouse, it is not expected to change.

data lake vs data warehouse

At that time, AWS introduced features like Athena and Redshift external tables, and the Glue catalog facilitated seamless metadata sharing across various AWS services. This development enabled the creation of a data model within the gold layer, allowing querying capabilities akin to those found in a data warehouse. The availability of SQL engines such as Spark SQL, Presto, Hive, and External Tables implemented by major providers facilitated querying of the data lake. However, challenges persisted in areas such as data management, transaction ACID support, and achieving efficient performance through indexes. For decades, data warehouses have been the dominant architectural approach for building data platforms in enterprises. With their rigid structure, the queries and analysis that can be performed using data warehouse information is fixed.

What’s The Difference Between A Data Warehouse, Data Lake, And Data Mart?

Data lakes and data lakehouses provide a centralized repository for managing large data volumes. They serve as a foundation for collecting and analyzing structured, semi-structured, and unstructured data in its native format for long-term storage and to drive insights and predictions. Unlike traditional data warehouses, they can process video, audio, logs, texts, social media, sensor data, and documents to power apps, analytics, and AI. They can also be built as part of a data fabric architecture to provide the right data, at the right time, regardless of where it is resides. In contrast to data warehouses, which store already “cleaned” relational data, a data lake stores data using a flat architecture and object storage in its raw form. Data lakes are flexible, durable, and cost-effective and enable organizations to gain advanced insight from unstructured data, unlike data warehouses that struggle with data in this format.

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