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Modern Database Infrastructure are build with ACID compliant . Aurora Global Database will be ACID compliant .. There could be some latency in milli Second because of network . But it has to be tested and analyzed before finalizing the solution
As far as ACID properties are concerned , they are related to the DB Engines i.e. MySQL and PostgreSQL. Both of these are ACID compliant.
For the performance concerns, Aurora Global Database lets you easily scale database reads across the world and place your applications close to your users. Your applications enjoy quick data access regardless of the number and location of secondary regions, with typical cross-region replication latencies below 1 second.
There are some limitations for the global DBs as called out here
If you need local write instead of cross-region access to Writer instance on primary region, and consider write forwarding, please check write forwarding document https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/aurora-global-database-write-forwarding.html, there are some limitation and consistency model. Before using write forwarding, I highly recommend to test application behaviour and compatibility/performance carefully.
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