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TiDB Experimental Features

This document introduces the experimental features of TiDB in different versions. It is NOT recommended to use these features in the production environment.



  • Improve the stability of the optimizer's choice of indexes: extend the statistics feature by collecting the multi-column order dependency information (Introduced in v5.0).
  • Background Quota Limiter (Introduced in v6.2.0): You can use the background quota-related configuration items to limit the CPU resources to be used by the background. When a request triggers Quota Limiter, the request is forced to wait for a while for TiKV to free up CPU resources.


  • Elastic scheduling feature. It enables the TiDB cluster to dynamically scale out and in on Kubernetes based on real-time workloads, which effectively reduces the stress during your application's peak hours and saves overheads. See Enable TidbCluster Auto-scaling for details. (Introduced in v4.0)
  • Balance hot Region scheduling by using the v2 algorithm in PD. See scheduler config balance-hot-region-scheduler for details. (Introduced in v6.3)



Backup and restoration

Data migration

Data share subscription

Garbage collection


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