# Pd Scheduling Frequently Asked Questions

+ The number of TiKV nodes in the cluster has not changed, but gradually there are cases where several TiKVs occupy space or the number of leaders are higher than other nodes
+ A TiKV node is online, but the leader transfer and region balance are very slow
+ In what ways can I accelerate the shrinking of TiKV nodes?
+ Does the large number of empty regions generated after truncating a large table require manual intervention?

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Generation and execution of schedules

From the previous lesson, we learned that PD is the central master of the TiDB database and is called the “brain” of the entire cluster. What should I do if there is a problem with PD scheduling?

In fact, in the course of our operation and maintenance management of TiDB, we do encounter problems such as:

- Does a large number of empty regions generated after truncating a large table require manual intervention, and how to deal with it?
- A new TiKV node has been launched, but the leader transfter and region balance are very slow. How can I accelerate it?
- In what ways can I accelerate the downsizing of TiKV nodes?
- There is no change in the number of TiKV nodes in the cluster. Why do you gradually see several TiKV spaces or leaders higher than other nodes?

Before providing a solution, let's review the following course content related to PD scheduling.