A Character Large OBject (CLOB) is a varying-length string measured in bytes that can be up to 2 gigabytes (2 147 483 647 bytes) long. A CLOB is used to store large SBCS or mixed (SBCS and MBCS) character-based data such as documents written with a single character set (and, therefore, has an SBCS or mixed code page associated with it). Note that a CLOB is considered to be a character string.