postgresql vacuum table

 

2down vote

according to Documentation VACUUM reclaims storage occupied by dead tuples. But according to this post Dead rows are deleted rows that will later be reused for new rows from INSERTs or UPDATEs. Some dead rows (or reserved free space) can be particularly useful for HOT (Heap-Only Tuples) updates that can reuse space in the same data page efficiently

转载于:https://www.cnblogs.com/oxspirt/p/7728541.html