What is Change Data Capture (CDC) and Why is it Important?
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Check out what Change Data Capture (CDC) is and why it is becoming ever more important. Slides also include useful tips on how to design your CDC implementation.
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- 1. www.flydata.com What Change Data Capture (CDC) is and Why It’s Important
- 2. What is CDC? Copyright © 2015 FlyData Inc. All rights reserved. CDC captures just the change data so that replication can be done more efficiently. www.flydata.com
- 3. www.flydata.com Why do we need CDC? • Increase in data collected • Queries take longer because database size is growing Need for BI Databases (Data Warehousing) & Need for Data Replication growing Copyright © 2015 FlyData Inc. All rights reserved.
- 4. www.flydata.com Methods for Syncing Data ▪ Dumping the whole DB ▪ Change Data Capture (CDC) ▪ Other approaches Copyright © 2015 FlyData Inc. All rights reserved.
- 5. www.flydata.com Benefits of CDC ▪ No need for full export/import ▪ Near real-time replication is possible => data always available for queries Copyright © 2015 FlyData Inc. All rights reserved.
- 6. www.flydata.com Steps for CDC 1. Capture Change Data 2. Transform data to format supported on destination 3. Upload to destination 4. (Handle any errors as they occur) Copyright © 2015 FlyData Inc. All rights reserved.
- 7. www.flydata.com 1. Methods for Change Data Capture • Transaction Logs • Triggers • Custom Solution at Application Layer Copyright © 2015 FlyData Inc. All rights reserved.
- 8. www.flydata.com 1. Methods for Capturing Change Data Method Pros Cons Transaction Logs • Minimal performance impact • No change to tables or application necessary • Transaction logs are in binary format. • Lacking good documentation Triggers • Handle everything at the SQL level • Significant performance impact to the master DB • Need to define triggers on each table Custom Solutions • If INSERTs only, relatively easy to implement • With UPDATEs and DELETEs, keeping data integrity becomes much harder. Copyright © 2015 FlyData Inc. All rights reserved.
- 9. www.flydata.com 2. Transforming Change Data Destination DB may have certain data type restrictions: • Identify such differences in data type • Convert the data Example of differences between MySQL and Amazon Redshift: • Case sensitive table/column names: MySQL - yes, Redshift - no • TIME column value beyond 23:59:59: MySQL - yes, Redshift - no • VARCHAR length: MySQL - character length, Redshift - byte length • Date ‘0000-00-00’: MySQL - allowed, Redshift - not allowed • BINARY, VARBINARY: MySQL - supported, Redshift - not supported • ENUM, SET: MySQL - supported, Redshift - not supported Copyright © 2015 FlyData Inc. All rights reserved.
- 10. www.flydata.com 3. Upload to Destination • Uploading data to BI databases could be tricky. • Error Handling Crucial for CDC data integrity: • Recognize when errors occur • Buffer change data after the error (order important!) • Recognize when error is handled • Resume uploading • Do this in parallel to scale Copyright © 2015 FlyData Inc. All rights reserved.
- 11. www.flydata.com www.flydata.com Check us out! -> http://flydata.com [email protected] Toll Free: 1-855-427-9787 http://flydata.com We are an official data integration partner of Amazon Redshift