CODEWITHSUNDEEP
mysql
user1322720
user1322720

Reputation:

What happens when I convert a TEXT column to a MEDIUMTEXT column?

Assuming I have a table with a TEXT column, and there is data in it, what happens when I change that column from TEXT to MEDIUMTEXT, and is there something that I should be aware of or avoid?

Could there be any corruption or loss of data?

Note:

Upvotes: 2

Views: 1870

Answers (2)

Till
Till

Reputation: 4523

You will have more characters allowed by row :

      Type | Maximum length
-----------+-------------------------------------
  TINYTEXT |           255 (2 8−1) bytes
      TEXT |        65,535 (216−1) bytes = 64 KiB
MEDIUMTEXT |    16,777,215 (224−1) bytes = 16 MiB
  LONGTEXT | 4,294,967,295 (232−1) bytes =  4 GiB

Upvotes: 1

kaqqao
kaqqao

Reputation: 15439

See the answer here for maximum sizes for different column types. Since you're changing from smaller to bigger type, you don't need to worry about truncation. It's a safe operation. Also, you very probably have no index on that column, so not much to worry about there either.

Upvotes: 1

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