[TiDB Usage Environment] Production Environment
[TiDB Version] 5.2.2
[Encountered Problem: Phenomenon and Impact]
There is a production environment TiDB cluster. Recently, due to the large amount of data, the TiKV storage space has become tight. The business has deleted data from two large tables based on the time field. In the past few days, several billion pieces of data have been deleted from the tables, but the TiKV disk space has not decreased.
What could be the reason for this? From which aspects should we investigate?
Deleted a few more days of data, and space has started to be reclaimed. However, I have another question: why are TiKV regions increasing? Shouldn’t empty regions be merged?