## Overview

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> [!NOTE]
> This lab only supports Chrome browser.

This lab showcases TiDB's seamless online rolling upgrade capability, avoiding disruptions to client applications — a common issue with traditional database upgrades. TiDB's cloud-native, loosely coupled architecture allows component-by-component, instance-by-instance upgrades. TiProxy enhances this by decoupling client sessions from stateless TiDB servers. During TiDB server reboots for upgrades, TiProxy seamlessly migrates sessions to active instances, ensuring uninterrupted client operations throughout the upgrade process.

![80%](https://lab-static.pingcap.com/quick-demo/demo_005_en.png)

### Tasks

+ Review the TiDB cluster status and topology.
+ Upgrade TiDB cluster to from version 7.5.4 to 8.1.1.
+ Observe and verify that the TiDB cluster is able to maintain functionality and accepts DML and query operations during the upgrade progress.

> [!TIP]
> Click **Start** to launch the lab environment.
> Once the environment is ready, select **Next** on the bottom toolbar to advance to **Module 1**.
> And, follow the step-by-step lab guide to connect to the hands-on environment and begin your tasks.