Range clustered tables
A range clustered table (RCT) is a table whose data is organized by a unique, not null integer record key, with a predetermined set of ranges based on each column of the key. These tables are useful when data is tightly clustered across one or more columns in a table. Each possible key value in the defined range has a predetermined location in the physical table, preassigned by an internal record ID (RID). The storage required for an RCT must be pre-allocated and available when the table is created, and it must be sufficient to store the number of rows found in the specified range, multiplied by the row size. RCTs have no need for free space, because space is reserved for use by the table even when rows do not yet exist. ...
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