The keys currently being used by
the TPFDF product to select logical records (LRECs) in a subfile. Keys
remain active until new keys are specified by a TPFDF macro or function, or
until the subfile is closed.
add current file
A file that has subfiles in
which a limited number of overflow blocks can be added. If a logical
record (LREC) is added that causes the limit to be exceeded, the oldest LREC
(or LRECs, if necessary) are deleted to make room. An add current file
is indicated by bit 2 of symbol &SW00OP1 in the DSECT for the file.
The maximum number of overflow blocks is indicated by symbol
&SW00NOC. See also add current processing.
add current processing
The steps completed
by the TPFDF product when a logical record (LREC) is added, using the DBADD macro or dfadd function, to an add current
file. See also add current file.
Airline Control System (ALCS)
A transaction
processing platform providing high performance, capacity, and availability,
that runs specialized transaction processing applications. The ALCS
environment runs application programs written for a TPF platform on an MVS
system with little or no modifications. This includes application
programs that are written using TPFDF macros and functions. Synonymous
with TPF/MVS.
ALCS
Airline Control System.
algorithm
In the TPFDF product, an
addressing mechanism that locates the prime block of a subfile. The
database administrator specifies the algorithm type in the DSECT macro.
See also algorithm argument.
algorithm argument
A value specified in
TPFDF application programs to indicate the subfile that will be affected by a
TPFDF macro or function. The algorithm argument can be a character
string or number, depending on the type of algorithm defined in the DSECT for
the file. An algorithm argument is also used to indicate a subfile in
an intermediate index file or detail file. See also
algorithm.
application program
A program written for or
by a user that applies to the user's work. In a TPFDF environment,
any program that requests a TPFDF service using a macro or function.