Answer by Hannah Vernon for Is ALTER TABLE ... DROP COLUMN really a metadata...
There are certain circumstances where dropping a column can be a meta-data-only operation. The column definitions for any given table are not included in each and every page where rows are stored,...
View ArticleIs ALTER TABLE ... DROP COLUMN really a metadata only operation?
I've found several sources that state ALTER TABLE ... DROP COLUMN is a meta-data only operation.SourceHow can this be? Does the data during a DROP COLUMN not need to be purged from the underlying...
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