Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A Character Large Object (or CLOB) is a collection of character data in a database management system, usually stored in a separate location that is referenced in the table itself. Oracle and IBM DB2 provide a construct explicitly named CLOB, and the majority of other database systems support some form of the concept, often labeled as text, memo or long character fields. CLOBs usually have very high size limits, on the order of 2GB or more. The tradeoff for the capacity is usually limited access methods. In particular, some database systems limit certain SQL clauses, such as LIKE or SUBSTRING from being used on CLOBs.

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