IBM AS/400 manual Removing Observability, Size, Reducing an Objects, Changing a Module or Program

Changing a Module or Program

level again afterwards to improve the program efficiency as you get ready for production.

To determine the current optimizatiprongramlevelobject,of a use the DSPPGM command. Display 3 of this command indicates the current level. To chang optimization level of a program, use the CHGPGM command. On the Optimize program parameter you can specify one the following values: *FULL, *BASIC, *NONE. These are the same values which can be specified on the OPTIMI parameters of either create command. The program is automatically re-cr when the command runs.

Similarly, to determine the current optimizationmodule, leveluse ofthe a DSPMOD

command. Display 1, page 2 of this command indicates the current level change the optimization level, use the CHGMOD command. You then need to create the program either using UPDPGM or CRTPGM.

Removing Observability

Observability

involves

the

kinds

of

data

that

can

be

stored

with

an

o

allow

the

object

to

be changed without recompiling the source. The

ad

data

increases

the

size of the object. Consequently, you may

want

to

data

in order to reduce object

size.

But

once

the

data

is

removed

also

removed.

You

must

recompile

the

source

and

recreate

the

program

the

data.

The

types

of

data

are:

Create

Data

Represented

by the *CRTDTA value. This data is necessary to

t

the

code

to

machine

instructions.

The

object

must

have

this

d

you

can

change

the

optimization

level.

Debug Data

Represented

by the *DBGDTA value. This data is necessary to

object

to

be

debugged.

Profiling

Data

Represented

by the *BLKORD and *PRCORD values. This data is

ne

essary to allow the system to re-apply block order and

proced

profiling

data.

Use

the

CHGPGM

command

or

the

CHGMOD

command

to

remove

some

or

all

the

data

from

a

program

or module respectively. Removing all observability r

object

to

its

minimum

size (without compression). It is not possible to

object in any way unless you re-create it.

Therefore,

ensure

that

y

source

required

to

create

the

program

or

have

a

comparable

program

CRTDATA.

To

re-create

it,

you

must

have

authorization

to

access

the

so

Reducing an Object's	Size
The	create	data	(*CRTDTA)	associated with an ILE program	or module	may
up	more than half of the object's size. By removing or				compressing	th
will	reduce	the	secondary	storage requirements for your	programs signi

If you remove the data, ensure that you have all source required t program or have a comparable program object with CRTDATA. Otherwise you not be able to change the object.

88 ILE RPG for AS/400 Programmer's Guide