Tuesday, November 13, 2018

Synchronous replication vs Asynchronous replication of Google Cloud SQL

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Cloud SQL allows you to choose between two replication types:
  • Synchronous replication. With synchronous replication, updates are copied to multiple zones before returning to the client. This is great for reliability and availability in the event of major incidents, but makes writes slower.
  • Asynchronous replication. Asynchronous replication increases write throughput by acknowledging writes once they are cached locally, but before copying the data to other locations. Asynchronous replication results in faster writes to the database because you don't have to wait for replication to finish; however, you might lose your latest updates in the unlikely event of a data center system failure within a few seconds of updating the database.
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