IBM DB2 Manual page 545

space. Contrast with external procedure
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| and native SQL procedure.
failed member state
A state of a member of a data sharing
group in which the member's task,
address space, or z/OS system terminates
before the state changes from active to
quiesced.
fallback
| The process of returning to a previous
release of DB2 after attempting or
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| completing migration to a current release.
| Fallback is supported only from a
subsystem that is in compatibility mode.
|
false global lock contention
A contention indication from the coupling
facility that occurs when multiple lock
names are hashed to the same indicator
and when no real contention exists.
fan set
A direct physical access path to data,
which is provided by an index, hash, or
link; a fan set is the means by which DB2
supports the ordering of data.
federated database
The combination of a DB2 server (in
Linux, UNIX, and Windows
environments) and multiple data sources
to which the server sends queries. In a
federated database system, a client
application can use a single SQL
statement to join data that is distributed
across multiple database management
systems and can view the data as if it
were local.
fetch orientation
The specification of the desired placement
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of the cursor as part of a FETCH
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| statement. The specification can be before
or after the rows of the result table (with
|
BEFORE or AFTER). The specification can
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| also have either a single-row fetch
orientation (for example, NEXT, LAST, or
|
ABSOLUTE n) or a rowset fetch
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| orientation (for example, NEXT ROWSET,
LAST ROWSET, or ROWSET STARTING
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AT ABSOLUTE n).
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field procedure
A user-written exit routine that is
designed to receive a single value and
transform (encode or decode) it in any
way the user can specify.
file reference variable
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| A host variable that is declared with one
of the derived data types (BLOB_FILE,
|
CLOB_FILE, DBCLOB_FILE); file
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| reference variables direct the reading of a
LOB from a file or the writing of a LOB
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into a file.
|
filter factor
A number between zero and one that
estimates the proportion of rows in a
table for which a predicate is true.
fixed-length string
| A character, graphic, or binary string
whose length is specified and cannot be
|
| changed. Contrast with varying-length
| string.
FlashCopy
A function on the IBM Enterprise Storage
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| Server that can, in conjunction with the
BACKUP SYSTEM utility, create a
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point-in-time copy of data while an
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| application is running.
foreign key
A column or set of columns in a
dependent table of a constraint
relationship. The key must have the same
number of columns, with the same
descriptions, as the primary key of the
parent table. Each foreign key value must
either match a parent key value in the
related parent table or be null.
forest An ordered set of subtrees of XML nodes.
forward log recovery
The third phase of restart processing
during which DB2 processes the log in a
forward direction to apply all REDO log
records.
free space
The total amount of unused space in a
page; that is, the space that is not used to
store records or control information is free
space.
full outer join
The result of a join operation that
includes the matched rows of both tables
that are being joined and preserves the
unmatched rows of both tables. See also
join, equijoin, inner join, left outer join,
outer join, and right outer join.
fullselect
|
| A subselect, a fullselect in parentheses, or
529
Glossary