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I have a table with a column contains HTML content and is relative greater than the other columns.
Having a column with a great size can slow the queries in this table?
I need to put this big fields in another table?
The TOAST Technique should handle this for you, after a given size the storage will be transparently set in a _toast table and some internal things are done to avoid slowing down your queries (check the given link).
But of course if you always retrieve the whole content you’ll loose time in the retrieval. And it’s also clear that requests on this table where this column is not used won’t suffer from this column size.