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Comments on How to calculate how much data is stored in a MySQL column?

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How to calculate how much data is stored in a MySQL column?

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I am considering either removing some columns or changing the datatypes if I could significantly reduce the amount of storage that is currently used by those columns. Some of the columns are ints and some are varchar.

How do I calculate (preferably in megabytes) the amount of storage a column uses?

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General comments (5 comments)
General comments
jcsahnwaldt‭ wrote over 3 years ago

Depends on the storage engine. Which one do you use? Have you seen this page? https://dev.mysql.com/doc/refman/8.0/en/storage-requirements.html

Charlie Brumbaugh‭ wrote over 3 years ago

@jcsahn InnoDB, yes

meriton‭ wrote over 3 years ago

If you have seen that page, what is still unclear? It seems to contain all the info you are looking for?

Charlie Brumbaugh‭ wrote over 3 years ago

@meriton that page is useful for calculating how much space adding other int column with all rows filled will take, less useful for how much space a varchar column where the length of the strings is not constant

Alexei‭ wrote over 3 years ago

Initially, I thought this was not an interesting question, but after digging a little I realized how hard it seems to be answerable for MySQL.