As firms demand more efficient data warehousing and business users demand round-the-clock availability of up-to-the-minute data, developers and DBAs are turning to change data capture in Oracle environments. Because of its flexibility, reliability, and scalability, Oracle database continues to be a popular relational database management system. And firms leveraging it can use change data capture for Oracle to improve the availability and performance of their databases, move data into a secondary database for reporting and analytics, load data into their data warehouses in micro-batches or real time, and more.
If you're wondering "what is change data capture?", it is a technology used to identify and capture data changes made to user tables in a database. These changes are then recorded in change tables and in a format consumable by ETL tools or for loading directly into a data warehouse. Because a selection of data can be extracted and loaded into the data warehouse, data can be updated more efficiently and at a lower cost.
Prior to the introduction of built-in change data capture for Oracle Database, DBAs and data architects would have to develop their own mechanisms for capturing change data, using methods like table differencing or change-value selection. Because these methods can be resource-intensive and time-consuming to implement, many Oracle users welcomed the introduction of a new low-impact form of change data capture for Oracle, which was included with Oracle Database 10g.
This log-based CDC technology eliminated the need for intrusive database triggers and leveraged the built-in Oracle replication tool Oracle Streams to capture and transport change data to a target database, data warehouse, or operational data store—without negatively impacting the performance of the source database. Unfortunately, with the release of Oracle 12c, this embedded technology for change data capture in Oracle was no longer supported, leaving users to work with unsupported software at their own risk or purchase licenses for the vendor's recommended Oracle replication software, Oracle GoldenGate.
There is an excellent alternative for efficient data replication and low-impact change data capture in Oracle environments: Qlik Replicate (formerly Attunity Replicate). Data replication softwaredesigned and engineered by specialists in enterprise data integration, Qlik Replicate (formerly Attunity Replicate) provides you with high-performance, automated data replication and data ingestion capabilities and our innovative, log-based CDC technology—in one simple, affordable package.
Qlik (Attunity) CDC for Oracle feature utilizes the database redo logs to implement non-invasive change data capture, enabling you to carry out low-latency data integration across the enterprise. Unlike Oracle GoldenGate, with Qlik Replicate (formerly Attunity Replicate) you can achieve this without placing agents on your source servers that create administrative and performance overhead. Also unlike Oracle GoldenGate, Qlik Replicate (formerly Attunity Replicate) provides the same fully automated replication process for all sources and targets, not just Oracle environments. Qlik (Attunity) CDC works with most ETL tools and is built into our easy-to-use yet powerful data replication solution, which supports real-time data warehousing and the widest range of source and target platforms including legacy systems and Hadoop distributions.