What Is a Data Lake? Pros and Cons of Data Lakes

A data lake, also known as an enterprise data lake, is a centralized data repository for large amounts of data. Data lakes store data in its raw format. Organizations and individuals use data lakes to store different types of big data, including structured data, unstructured data, and semi-structured data. Data lakes use a flat architecture without a hierarchy of files or folders. Each piece of data in a data lake is tagged with a set of metadata and assigned a unique identifier. Data lakes pull from a wide variety of data sources, including mobile apps, IoT devices, websites, and corporate applications. Data lakes improve the functionality of businesses by storing all data in one location rather than several separate data silos. Although there are some on-premises data lakes, most exist in a cloud storage environment. Data storage service providers host cloud-based data lakes for organizations to process data as needed. Data lakes can feed into a data pipeline by sending certain raw data to specific data warehousing systems for analysis. A data lake is a cost-efficient way to store a growing amount of data that can function with advanced analytics tools. 1. __Functionality__: Data lakes function well with big data analytics tools like machine learning, artificial intelligence algorithms, real-time advanced analytics, and predictive modeling. 2. __Scalability__: Data lakes can handle large data volumes that grow and fluctuate based on data inputs. Data lakes are a good option for businesses with rapidly increasing data storage needs. 3. __Low cost__: Most data lakes use open source technologies that are cost-effective for organizations and individuals. Data lakes can devolve into data swamps with poor data integrity and security issues. 1. __Complexity__: Data lakes involve such large volumes of data that data scientists and data engineers are typically the only users able to sort through them. Professional skills are generally required to pull data analysis from data lakes. 2. __Data quality issues__: Sifting through data lakes is a time-consuming process. Data lakes require regular data governance to manage and maintain data integrity. Without proper care and attention, a data lake can become a data swamp with unorganized and unusable data that lacks clear identifiers or metadata information. 3. __Security risks__: With so much data stored in a data lake, security risks and access control problems can arise. Without proper oversight, certain pieces of sensitive data could live in a data lake and become available to anyone with access to the data lake. A data warehouse, data lake, and database can all provide high-performance methods of data mining and analysis with varying capabilities for different amounts of data. - __Database__: A database typically compiles one kind of raw data, or in the case of relational databases, different types of related data. The business decision-makers deal with a simple data set or data store—one or more types of data storage—categorized for quick analysis. Databases use a data management system known as SQL (structured query language) to determine how the data is stored and retrieved for the end-user. Databases also tend to use metadata to help categorize the data they store. - __Data warehouse__: A data warehouse drastically increases decision-making possibilities by handling much greater historical data, often from disparate sources. Data warehouses offer sophisticated methods of organization and analysis. These methods are known as schemas, a sort of rule or algorithm for making data useful. Together, the schemas make up a data model. A data warehouse will usually feature an SQL but might also include other business intelligence tools. - __Data mart__: A data mart is a subset of data warehouses that focus on specific data for specific business insights. A company’s sales, personnel, or operations departments might use operational data to assist in related business decisions. - __Data lake__: A data lake is a further innovation in the realm of data mining and utility. It can handle even greater volumes of data than a traditional data warehouse, and it specializes in dealing with heterogeneous data. Data lake architecture lacks the schema that a data warehouse possesses. These fundamental differences permit greater flexibility for business users, but this often comes with a cost to speed and efficiency. Get the [MasterClass Annual Membership](https://www.masterclass.com) for exclusive access to video lessons taught by business luminaries, including Daniel Pink, Anna Wintour, Chris Voss, Robin Roberts, Sara Blakely, Daniel Pink, Bob Iger, Howard Schultz, and more. A data lake is a centralized data repository for large amounts of raw data.