因为你列显然是大,他们要烤,这意味着他们是压缩和超行存储在一个单独的表中。
Since your columns are obviously big, they are going to be TOASTed, meaning they are compressed and stored out-of-line in a separate table.
在一次UPDATE操作,通常保留原样不变字段的值,所以一个UPDATE不得因其不在一直线上的行值TOAST如果没有超行值改变成本。
During an UPDATE operation, values of unchanged fields are normally preserved as-is; so an UPDATE of a row with out-of-line values incurs no TOAST costs if none of the out-of-line values change.
作为知名的收藏家的蔡铭超在福建省有一个自己的拍卖行。
Cai, a well-known collector, owns an auction house in Fujian province.
应用推荐