As data grows at a massive scale, industries are adopting new ways to manage data effectively. One of the most popular techniques for managing data is CDC. The benefits of change data capture (CDC) enables organizations to capture changes made to data sources.
It captures database changes and stores them in destinations like a data warehouse with the help of many CDC tools available in the market. CDC allows businesses to streamline data replication processes to ensure that all information is captured in real-time. This facilitates better analytics and disaster recovery.
Such benefits make change data capture a go-to technique for moving data from source databases to destination systems. This article discusses the definition, types, and benefits of change data capture for organizations.
CDC Definition
CDC Definition
CDC identifies and detects database changes and then delivers those changes to a data warehouse or a downstream process in real-time. Whenever a change occurs in a source database, an action is taken by another system or process to replicate that change. As a result, businesses use CDC to ensure that the data at the source and the destination are in sync.
The benefits of change data capture help to identify the rows in source tables that have changed since the last replication. They can replicate transactional changes to data. This includes new data being added to a table, historical data being deleted, or existing data being updated. These changes are mostly from create, update, and delete operations on databases.
There are three types of methods for implementing CDC.
The log-based CDC process reads the transaction log of the source database. By reading the transaction log, businesses can get a complete list of all data changes in their databases. This is mostly used to restore after a system failure based on the log data.
Trigger-based CDC technique
In trigger-based CDC, businesses can capture all the inserts, updates, and deletes operations performed on the databases. However, a trigger is initiated for every change to update a ‘change table,’ which leads to additional tasks and overheads. As a result, log-based CDC is preferred over trigger-based CDC.
Time-stamp based CDC
Generally, timestamps refer to the date and time. In timestamp-based CDC, the source table has either CREATE or UPDATE timestamps for every row. It can detect whether a row was created or updated.
Benefits of Change Data Capture
Data-driven organizations use CDC for several advantages. Here are some of the benefits of change data capture:
- Real-time business intelligence: Today, analytics is a major differentiator for businesses that collect or generate a colossal amount of data. However, without a proper system in place, it becomes challenging to manage big data for analytics.
- By embracing CDC, organizations can expedite the collection and organization of data for quick analytics. Since collection and transformation happens in real-time with CDC, organizations can store the data in data warehouses for better business intelligence.
- Reduce the need for intensive resources: One of the benefits of change data capture is that you can optimize resource utilization to reduce operational costs. In organizations, performing large batch operations on the data becomes inefficient, slow, and needs intensive resources.
- With CDC processes, organizations monitor and extract database changes in real-time, which requires fewer computing resources and provides better performance. Instead of waiting for large batch jobs that might take a day to run, CDC processes data into micro-batches, thereby optimizing resource utilization.
- Eliminate pressure on operational databases: If you use operational databases to monitor activities, perform analytics, and audit historical data, it would negatively impact the performance of the database. To avoid performance issues, CDC is used to create a copy of operational databases that are constantly refreshed and can be accessed by different users.
- As traffic is diverted to operational database copies, the pressure on operational databases is reduced. As a result, one of the major benefits of change data capture is that the operational databases rarely face issues like poor performance or unanticipated downtime.
- Reduce incompatible databases issues: Often, companies witness compatibility issues while connecting two or more databases. But with CDC, companies enhance their capabilities to integrate with various software that is mostly incompatible with in-house databases.
- It allows organizations to be more flexible while choosing business applications. As a result, teams in organizations can focus on their business goals rather than spending time on database compatibility issues.
- Disaster recovery or backup plan: As data replication is carried out in real-time, one of the key benefits of change data capture is it helps to create backups of mission-critical databases. In the event of system failures, data in replication can be used to recover the primary databases. This is essential for organizations where failure can lead to significant business loss.
- Improves master data management system: A master data management system is part of an organization that consolidates all essential data in one place. Teams in organizations use CDC processes to draw database changes from multiple databases and update the master data management system continuously.
- Different departments can then access data from master data management and use it for reporting and analysis. This helps businesses enhance the accuracy of data-driven decisions in less time.
- Enhance data security: One of the great benefits of change data capture is that it empowers you to manage data accessibility as well. This enhances data security as you can control the flow of data based on the sensitivity of the collected information. Such practices ensure that you comply with the different data protection laws of different countries.
- Obtain competitive advantage: As CDC enables data collection in real-time, teams across organizations access recent data for making data-driven decisions quickly. With CDC, companies can improve the speed and accuracy of decision-making in real-time. This provides companies with a competitive advantage over competitors that rely on batch processing for data management.
Conclusion
Today, organizations replicate data to support various reasons like high availability, better analytics, data management, and seamless integrations among databases. CDC techniques help you capture real-time changes made to databases and stream these changes to external processes, applications, or other databases.
Based on the operation and business requirements, you can select from different types of CDC to harness the benefits of change data capture.
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Manjiri is a proficient technical writer and a data science enthusiast. She holds an M.Tech degree and leverages the knowledge acquired through that to write insightful content on AI, ML, and data engineering concepts. She enjoys breaking down the complex topics of data integration and other challenges in data engineering to help data professionals solve their everyday problems.
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