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hashed access
hashed key
- a database key facilitating direct access to data on a storage device.
See key and direct access.
hashing
- an indexing technique where an algorithm is used to calculate the
location of a row or record, requiring a full key look-up and an exact
match, including upper and lower case characters, spaces, and punctuation.
having
- An SQL statement clause that allows additional criteria to be applied
to an SQL statement after the WHERE and GROUP BY clauses have been processed.
The HAVING clause is generally used to apply criteria to an aggregation
as in "SUM(ORDERS.TOTAL)>10".
high cardinality
- (1) High table cardinality indicates a large number of records in
a table, a Sales Fact table for example.
- (2) High column cardinality indicates many possible unique values
in a column. For example, names, addresses, account balances, product
inventories, etc. See cardinality.
high-water mark
hints
- a method of forcing the Omnidex Optimizer to use a particular retrieval
method, in a star schema database environment, for example.
host
- a generic term for any device that allows communication from an outside
source.
hosts file
- a file containing a cross reference between names for computers in
a network and their physical network addresses, resident on the computer
specified as the domain name server. See domain name server.
HPPA
- Hewlett Packard Precision Architecture; a RISC architecture used in
series 9nn computers.
Hybrid DR
- Hybrid Detail Record; a variation of a multi-domain child, providing
the ability to index a child table as a DR domain or in an SI domain.
See DR domain and SI domain.
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