Data Lake vs Data Warehouse: Comparing Two Popular Data Storage

  • Posted on : August 2, 2021
  • Modified: August 2, 2021

  • Author : SPEC INDIA
  • Category : Big Data & Database

Data is the most valuable ingredient for any organization, right from processing huge volumes of data to storing them to analyzing them for further insights. Data storage is a competitive task when we talk of big data, especially because of the absolute volume of data involved. Two popular methodologies focus on data storage and are often compared with each other – Data Lake vs Data warehouse.

Both these terminologies are mainly used for Big Data Storage and hence often used interchangeably. But there are major differences in what they offer. They have different purposes and are applicable to organizations, as per requirements. They have different structures and processing capabilities and hence will have a distinct user base.

Before we look at data lake vs warehouse, let us first understand the basic concept of these two technologies, their benefits, and salient features.

What Is A Data Lake?

A data lake is a system or repository of data stored in its natural/raw format, usually, object blobs or files. A data lake is usually a single store of data including raw copies of source system data, sensor data, social data etc., and transformed data used for tasks such as reporting, visualization, advanced analytics, and machine learning. – Wikipedia

As the data lake definition suggests, a data lake is a huge storage repository that has ample raw data in its basic format. Just like there are multiple tributaries that get in water into lakes, there are multiple sources from where real-time data comes into data lakes. The data could be structured, semi-structured, or unstructured. It is highly flexible, has no fixed limit on size, and is used maximum by data scientists and engineers. It stores all the data irrespective of whether it is needed or not. It provides a huge amount of quantity of data for enhanced performance and native integration.

Each data component in the data lake is offered a unique identifier and there are certain extended metadata tags associated, that provide great analytical competencies. Data is stored with a flat architecture, and it can load and store data without transformation. Certain popular data lake organizations are Azure, Hadoop, Amazon S3, etc.

Data Lake Features:

  • Unlimited data size and sufficient data storage
  • Simple and easy to use
  • Fault-tolerant
  • Data fidelity and manageability
  • Understanding data through indexing, crawling, and cataloging of data

Business Benefits Of Data Lake:

  • Caters to all data from source systems and hence no data is neglected
  • Data storage in a basic and untransformed format
  • Ample analytical information can be garnered from data lakes
  • Democratization of data
  • Scalability, versatility, and schema flexibility
  • Access to advanced analytics
  • Ability to derive value from data

What Is Data Warehouse?

In computing, a data warehouse (DW or DWH), also known as an enterprise data warehouse (EDW), is a system used for reporting and data analysis and is considered a core component of business intelligence. DWs are central repositories of integrated data from one or more disparate sources. – Wikipedia

A data warehouse is a large storage location that gathers data from different sources, based on which the basis for business intelligence is generated. Especially for medium to large-sized organizations, data warehouses work best for sharing data and making data-driven decisions, across teams or databases. It is a mix of technologies and different components for the best use of information. Data warehouses focus on the electronic storage of vast information that is especially meant to provide analytical information as desired.

They transform the raw data into meaningful information. Popular organizations that offer data warehouses are Teradata, Snowflake, Yellowbrick, etc. The major functionalities that encompass the data warehouses are extraction, cleansing, transformation, loading, and refreshing of data. They store data in different files and folders that assist in using the data to make the best of business decisions, through a multi-dimensional view of data available in real-time. There is advanced querying and analytics available through a well-structured infrastructure. Even the cloud supports data warehouses and cloud-based data warehouses are the big thing now.

Features Of Data Warehouse:

  • Denormalized data for better performance
  • Usage of a huge amount of historical information
  • Controlled data loading
  • Common usage of planned queries and ad hoc ones
  • Non-volatile and subject-oriented data handling

Benefits Of Data Warehouse:

  • Offers historical insight into information
  • Increases revenue generation
  • Scalable, flexible, and efficient
  • Easy interoperability with on-premises and cloud-based infrastructure
  • Enhances data security and conformance
  • Offers augmented business intelligence
  • It Helps organizations focus with confidence
  • Streamlines information flow

Data-Lake-vs-Data-Warehouse

Data Lake vs Data Warehouse – A Vivid Comparison

FactorsData LakeData Warehouse
Access to DataUsers can access raw data anytime from anywhere prior to its transformation. This makes it quick and effective to get results.Users can access data only when it is set for transformation. Hence, it takes more time for the changes to get reflected.
Analytics and PurposeMachine learning, data discovery, predictive analyticsBusiness intelligence, visualization, batch reporting
Type of DataNon-relational and relational from IoT devices, mobile apps, social media, corporate appsRelational from operational databases, transactional systems, business applications
Storage and ComputeData lakes have decoupled storage and computeData warehouses have tightly coupled storage and compute
HistoryRelatively new technology in the world of big dataHas been used for decades for various databases
Flexibility and ScalabilityData lakes are easy to change and highly flexibleData warehouses are very structured and hence tough to scale and change
Data QualityContains raw data that may or may not be curatedContains high-quality data that is curated prior to storage
Data SecurityRelatively evolving security concepts as it is a newer technologyWell-defined security processes as it has been existing for a long time
Ingestion CapabilitiesStorage is possible with the least processing and data can be transformed only when neededData needs to be cleansed and refined prior to storage
SchemaWriting while doing the analysis. Schema is defined while the data is stored.Designing before implementation. Schema is defined before the data is stored.
Query Results and Storage CostsQuick query results through low-cost storage. Data storing is inexpensive.Quick query results through high-cost storage. Data storing is costlier.
UsersBusiness analysts, data scientists, developersBusiness analysts, operational users
StorageAll data is preserved in its raw form and transformed only when neededData is extracted from transactional systems, cleaned, and transformed
AgilityHighly agile, can configure and reconfigure as neededLess agile and has a fixed configuration
Capturing of DataCan collect varied data – structured, semi-structure, and unstructured in its original formCan collect structured information and then organize it as necessary
Data Processing MethodData lakes use Extract, Load, and Transform processData warehouses use Extract, Transform, Load process
Data VolumeGenerally, in PBs or hundreds of PBsGenerally, in TBs
Data FormatDiversified with multiple sources and formatsProprietary
Vendor Lock-InNoYes
Popular ToolsAmazon S3, Azure Blob Storage, etc.Amazon Redshift, Google BigQuery, Panoply, etc.
Similarities Between Data Lake And Data Warehouse

As they both belong to the ‘data’ community, there are certain characteristics that are common to both – data lakes and data warehouses. Here are they:

Both are-

  • Devised to assist organizations in making better decisions
  • Meant for data scientists and data analysts
  • Designed for storage of huge amounts of disparate data
  • Major constituents of modern-day architecture
  • Built on purpose defined by the organization
When To Use What?

Businesses must use data lakes when,

  • There is not much know-how about what type of data is to be handled
  • Data types are not suitable for typical relational models
  • Datasets are huge or fast-growing
  • Data relationships are not well defined

Businesses must use data warehouses when,

  • There is knowledge about data being stored, in advance
  • Data formats are static and may not change much
  • There is a need for standard reporting formats with fast query handling
  • There is special data security needed for the management of data
On A Closing Note:

The world of business intelligence services and big data is impacted heavily by data solutions. Of the lot, data lakes and data warehouses have always created an exciting comparison that is healthy to perceive. The above comparison matrix is clear enough to explain the goodness of both and why both have their niche carved for themselves.

Though different from each other, data lakes and data warehouses are complementary data solutions and work as a complete solution for enterprises. Together, they can extract the best value out of data. Let the users enjoy the benefits of data lakes and data warehouses, as the world of data gets larger and bigger!

Author: SPEC INDIA

SPEC INDIA, as your single stop IT partner has been successfully implementing a bouquet of diverse solutions and services all over the globe, proving its mettle as a boutique ISO 9001:2015 certified IT solutions organization. With efficient project management practices, international standards to comply, flexible engagement models and superior infrastructure, SPEC INDIA is a customer’s delight. Our skilled technical resources are apt at putting thoughts in a perspective by offering value-added reads for all.


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