Implementing Siebel Business Applications on DB2 for z/OS > Customizing a Development Environment > About Siebel Tables and CLOB Columns >

About Defining New Extension Columns as CLOB Data Types

If you create an extension column for a table, you can define the column as a CLOB data type by typing the value CLOB in the Physical Type field of the column in Siebel Tools (although CLOB is not one of the options in the Physical Type field drop-down list). For information on creating extension columns for tables, see Roadmap for Creating Custom Extensions to the Siebel Schema.

It is recommended (though not required) that you also enable CLOB columns for the table containing the extension column in the storage control file as described in Converting LONG VARCHAR Columns to CLOB Columns.