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r---------T----------T-------------------------------------------------,
I
Name
I
operation
I
Operand
I
~---------+----------+-------------------------------------------------~
I
I
INDEX
I
GENINDX
BUILD GENERATION
I
I
I
Check Exceptional Returns
INDEX
I
I
GENINDX
I
CAMLST
I
BLDG,DLEVEL,VOLNUM"DELETE,,4
I
I
DLEVEL
I
DC
I
CLsrA.B.C.D'
BLANK DELIMITER
I
I
VOLNUM
I
DC
I
CL6'000045'
I
L _________
~
__________
~
_________________________________________________ J
The INDEX macro-instruction points to the
CAMLST
macro-instruction.
BLDG,
the first operand of CAMLST, specifies that a generation index be
built.
DLEVEL, the second operand, specifies the main storage
location
of
an
area
into
which
you have placed the fully qualified name of a
generation index.
VOLNUM, the third operand, specifies the main storage
location of an area into which you have placed the 6-byte serial
number
of the volume on which the generation index is to be built.
DELETE, the
fifth
operand, specifies that all data sets dropped from the generation
data group are to be deleted.
The
final
operand,
4,
specifies
the
number
of
data
sets
that are to be maintained in the generation data
group.
Note:
A model DSCB for the generation data set must be
placed
on
the
control
volume
containing the index prior to creation of the data set.
The system will take information from the model DSCB when you
create
a
data
set for the group.
A model DSCB is created by specifying, in a DD
statement: the name of
the
data
set;
zero
space
allocation,
i.e.,
SPACE=(TRK, (0»; and appropriate DCB=parameters.
HOW TO DELETE AN INDEX
You
can
delete
any
number
of index levels from an existing index
structure.
Each level of the index is deleted separately.
You
delete
each
level
of
the
index
by
using
the
INDEX
and
CAMLST
macro-
instructions.
If
an
index level either has an alias, or has other index levels or
data sets cataloged under it, it cannot be deleted.
Example:
In the following example, index level C is deleted from
index
structure
A.B.C.
The
search for the index level starts on the system
residence volume.
r---------T----------T-------------------------------------------------,
I
Name
I
Operation
I
Operand
I
~---------+----------+-------------------------------------------------~
I
I
INDEX
I
DELETL
DELETE INDEX LEVEL C FROM
I
I
I
Check Exceptional Returns
INDEX STRUCTURE A.B.C
I
I
DELETE
I
CAMLST
I
DLTX,LEVELC
I
I
LEVELC
I
DC
I
CL6'A.B.C'
ONE BLANK FOR DELIMITER
I
L _________
~
__________
~
_________________________________________________ J
The INDEX macro-instruction points to the
CAMLST
macro-instruction.
DLTX,
the
first
operand
of
CAMLST, specifies that an index level be
deleted.
LEVELC,
the
second
operand,
specifies
the
main
storage
location
of an area into which you have placed the fully qualified name
of the index structure whose lowest level is to be deleted.
HOW TO ASSIGN AN ALIAS
You assign an alias to an index level by using the INDEX
and
CAMLST
macro-instructions.
An
alias
can
be
ass~gnea
only to a high level
index; e.g., index A of index structure A.B.C can
have
an
alias,
but
14
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