When a data definition statement is processed, the system tables are updated automatically.
When a table is changed by an ALTER, CREATE, DROP, or RENAME statement, the Teradata Database automatically increments the version count for that table. For more information about creating, changing, and dropping tables, see SQL Data Definition Language.
Most tables cannot be altered using INSERT or UPDATE, or DELETE SQL statements; however, Data Dictionary tables in the form of logs can be modified. See “Data Dictionary Logs that Require Manual Purging” on page 365 for more information. Also, the object use count feature allows the AccessCount and LastAccessTimeStamp columns to be updated through SQL in the following dictionary tables: Dbase, TVM, TVFields, and Indexes.