The Ultimate Guide to High Availability with MariaDB

BLOB

Syntax

BLOB[(M)]

Contents

  1. Syntax
  2. Description
    1. Indexing
      1. Note
    2. Oracle Mode
  3. See Also

Description

A BLOB column with a maximum length of 65,535 (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.

BLOB and TEXT columns can both be assigned a DEFAULT value.

Indexing

On a column that uses the BLOB data type, setting a unique index is now possible.

Note

In previous releases, setting a unique index on a column that uses the BLOB data type was not possible. Index would only guarantee the uniqueness of a fixed number of characters.

Oracle Mode

In Oracle mode, BLOB is a synonym for LONGBLOB.

See Also

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