Fujitsu UDS/SQL V2.5 用户手册
Population
SSL
142
U929-J-Z125-9-76
Size of the hash area for a secondary key
Only in the case of SYSTEM sets can a secondary key be used for conversion by a hash
routine. UDS/SQL calculates the minimum number of pages required for distributed storage
of record addresses on the basis of the set occurrence population entry (see the section
routine. UDS/SQL calculates the minimum number of pages required for distributed storage
of record addresses on the basis of the set occurrence population entry (see the section
) and then reserves the number of pages corresponding
to the next higher prime number.
If some pages overflow due to uneven data distribution by the hash routine, UDS/SQL
automatically sets up overflow pages.
automatically sets up overflow pages.
A hash area can be extended at a later time by means of the BREORG utility routine (see
the "
the "
" manual, BREORG).
By default, UDS/SQL sets up a hash area with a size of one page.