Help Center> Relational Database Service> User Guide> Working with RDS for MySQL> Application Lossless and Transparent (ALT)> ALT Experience

Updated on 2023-02-07 GMT+08:00

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ALT Experience

If ALT is enabled and you trigger a primary/standby switchover using Sysbench, Tpcc-MySQL, or a MySQL client that is connected to the read/write splitting address of your DB instance, your database only freezes briefly during the switchover.

The following figures show you what effect ALT has when a primary/standby switchover is triggered by Sysbench, Tpcc-MySQL, and a MySQL client.

Switchover using Sysbench
Switchover using Tpcc-MySQL
Switchover using the MySQL CLI
As shown in the following figure, user-defined variables, session variables, and databases remain unchanged before and after the primary/standby switchover.

The following figure shows how the transaction drain timeout interval determines whether ALT takes effect for the current session.

Parent topic: Application Lossless and Transparent (ALT)

Previous topic: Disabling ALT

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