BLOB column with a maximum length of
216 - 1) bytes. Each
BLOB value is stored using a two-byte length prefix that indicates the number of bytes in the value.
An optional length
M can be given for this type. If this is done, MariaDB creates the column as the smallest
BLOB type large enough to hold values
M bytes long.
BLOBS can also be used to store dynamic columns.
In MariaDB 10.4, it is possible to set a Unique index on a column that uses the
BLOB data type. In previous releases this was not possible, as the index would only guarantee the uniqueness of a fixed number of characters.
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