This function only applies to buffer pools of type Natural and the message pool.
is used to maintain preload lists. In a preload list, you can specify the names of Natural objects or Natural messages that are to be loaded into the buffer pool or message pool when it is initialized.
The source code of a preload list is stored as a Natural source object of the type
Text in the Natural system library SYSBPM. The first line of a preload list
source contains the comment **BPL** (buffer pool preload list) or
**MPL** (message pool preload list).
For further information on the preload list, see the relevant section in Natural Buffer Pool or Message Buffer Pool in the Operations documentation.
To invoke
In the SYSBPM Main Menu, enter B, C
or * to select a Natural buffer pool or M to select a
message pool and the following function code:
P
Or:
Enter one of the following SYSBPM direct commands:
PRELOADLIST to invoke the menu for Natural objects
or
MPRELOADLIST to invoke the menu for Natural messages
The Preload List Maintenance menu appears.
The functions provided in the Preload List Maintenance menu are explained in the following section. This section also provides information on additional preload list maintenance functions.
This function invokes the List Preload Lists screen which displays a list of all existing preload lists.
To invoke
In the Preload List Maintenance menu,
enter function code L and the name of a preload list. Asterisk (*)
notation is also allowed for a preload list name.
Or:
Enter one of the following SYSBPM direct commands:
LIST PRELOADLIST list-name
to list preload lists containing Natural objects
or
LIST MPRELOADLIST list-name
to list preload lists containing Natural messages
Asterisk (*) notation is also allowed for list-name.
The List Preload Lists screen appears.
For a list of available line commands, enter a question mark (?) in the leftmost screen column (prefix information).
For a list of commands that can be entered in the command line of the List Preload Lists screen, invoke the Help window by entering a question mark (?) in the command line. If required, press PF7 to scroll backward and PF8 to scroll forward in the window.
This function invokes the Edit Preload List screen where you can create a new preload list, add objects to an existing list or delete objects from it.
Important:
The editing functions provided on the Edit Preload
List screen are a subset of the functions provided by the
Software AG Editor
(described in the Editors documentation). Therefore,
before you start a Natural session to edit a preload list, set the Natural
profile parameter EDPSIZE to a value
greater than 0 (zero); see also Profile
Parameters in the Parameter Reference
documentation. We recommend that you set EDPSIZE to a
minimum of 100.
For a list of available line commands, enter a question mark (?) in the leftmost screen column (prefix information).
For a list of commands that can be entered in the command line of the Edit Preload List screen, invoke the Help window by entering a question mark (?) in the command line. If required, press PF7 to scroll backward and PF8 to scroll forward in the window.
This section covers the following topics:
To create a preload list
In the Preload List Maintenance menu, perform the following steps:
Enter function code E.
Clear the contents of the field Preload List Name, that is, do not enter the name of a preload list.
In the fields Library and Objects, leave the default asterisk (*).
The Edit Preload List screen appears.
For Natural Objects
In the relevant input fields, enter the name of the
library where the objects are stored, the names of the objects and the
corresponding database IDs (DBID) and file numbers
(FNR).
If DBID and FNR are left unspecified, a default setting is provided by the current system file FUSER or FNAT in libraries whose names start with SYS (except the library SYSTEM).
The resident flag will be set to Y (Yes) in
column on the editing screen if no value is
entered. Resident means that the object is not deleted from the buffer pool,
not even if its Use Count changes to 0
(zero). (Use Count corresponds to
Current Use
Count described in Directory
Information.)
For Messages
In the relevant input fields, enter the name of the
library where the user messages are stored (a blank for Natural system
messages), the numbers of the messages (this field cannot be left unspecified),
the corresponding database IDs (DBID) and file numbers
(FNR), the code page and the language code.
If DBID and FNR are left unspecified, default values are provided during the preload process by the current system file FUSER or FNAT in libraries whose names start with SYS (except the library SYSTEM). If no messages are found on FUSER or FNAT, search is extended to steplibs.
If Code Page is left unspecified, a default code page is provided by the session code page during the preload process.
If Language Code is left
unspecified, a default language is provided by the system variable
*LANGUAGE during the preload process.
To save the preload list as a source object of type Text in the library SYSBPM, enter the following command in the command line:
SA set-name
See also Generate Preload List from Buffer Pool.
To add a new object to a preload list
In the Preload List Maintenance menu,
enter function code E and the name of a preload list.
Or:
On the List Preload Lists screen, in
the leftmost column, next to the preload list required, enter the following
line command:
E
Or:
Enter the following SYSBPM direct command:
EDIT PRELOADLIST list-name
for a preload list containing Natural objects, or
EDIT MPRELOADLIST list-name
for a preload list containing messages.
The Edit Preload List screen appears with the specified preload list.
Complete the input fields as described in step 2 in Creating Preload Lists.
Enter your modifications in preload list you have selected.
To save the modifications, in the command line of the Edit Preload List screen, enter the following:
SA
To modify an object of a preload list
In the Preload List Maintenance menu,
enter function code E, a library name and the name of a preload
list.
Or:
On the List Preload Lists screen, in
the leftmost column, next to the preload list required, enter the following
line command:
E
Or:
Enter the following SYSBPM direct command:
EDIT PRELOADLIST list-name
for a preload list containing Natural objects, or
EDIT MPRELOADLIST list-name
for a preload list containing messages.
Or:
The Edit Preload List screen appears with the specified preload list.
In the relevant input field(s), replace the existing entries with new values. The same rules are applied as described in step 2 in Creating Preload Lists.
To save the modifications, in the command line of the Edit Preload List screen, enter the following:
SA
To delete an object from a preload list
In the Preload List Maintenance menu,
enter function code E, a library name and the name of a preload
list.
Or:
On the List Preload Lists screen, in
the leftmost column, next to the preload list(s) required, enter the following
line command:
E
Or:
Enter the following SYSBPM direct command:
EDIT PRELOADLIST list-name
for a preload list containing Natural objects, or
EDIT MPRELOADLIST list-name
for a preload list containing messages.
The Edit Preload List screen appears with the specified preload list.
In the leftmost column, next to the object required, enter the following line command:
D
The specified object is removed from the preload list.
To save the modification, in the command line of the Edit Preload List screen, enter the following:
SA
This function is used to generate a new preload list by using the names of the objects currently loaded in the buffer pool. From the objects that are currently in the buffer pool, you can select those you wish to be included in the preload list.
To generate a preload list, use either of the following
options:
In the Preload List Maintenance menu,
enter function code G and the name of a preload list. In the
fields Library, Objects,
Resident, Use Count and
Total Use Count, specify the objects to be included in the
list:
To include all objects that are currently in the buffer pool, enter an asterisk (*) in the fields Library, Objects and Resident, and leave the fields Use Count and Total Use Count blank.
Or:
To include specified objects in the buffer
pool, in the fields described below, you can enter the following values:
| Library | A single name or asterisk (*) notation. |
| Objects | A single name or asterisk (*) notation. |
| Resident | An asterisk (*) for all objects or
Y (Yes) for all objects currently marked as resident in the buffer
pool.
|
| Use Count | A numeric start
value (>), for example >10.
Selects all objects with a Use Count greater than or equal
to value.
This field corresponds to Current Use Count described in Directory Information. |
| Total Use Count | A numeric start
value (>), for example >10.
Selects all objects with a Total Use Count greater than or
equal to value.
This field corresponds to BP Total Use described in Directory Information. |
Enter either of the following SYSBPM direct commands:
GENERATE PRELOADLIST list-name
or
GENERATE PRELOADLIST list-name gen-library
(See also the explanations of field values above).
A message appears confirming that the preload list was generated from the buffer pool.
All preload list objects will be generated as resident (entry
Y in column R) by default. Choose manually,
which objects you want to remove from the list.
Objects from the library SYSBPM will not be included in the generated preload list as it can be assumed that these are objects which were only loaded into the buffer pool in order to execute this function.
This function is used to generate a new preload list by using the names of the objects currently loaded in the message pool. From the objects that are currently in the message pool, you can select those you wish to be included in the preload list.
To generate a preload list, use either of the following
options:
In the Preload List Maintenance menu,
enter function code G and the name of a preload list. In the
fields Library, Message,
DBID, FNR, Language
Code and Code Page, specify the messages to be
included in the list:
To include all messages that are currently in the message pool, enter an asterisk (*) in the Library field, enter 1 - 9999 in the Message Number field, 0 in the fields DBID, FNR and Language Code, and leave the field Code Page unspecified.
Or:
To include specified messages in the
message pool, in the fields described below, you can enter the following
values:
| Message Number | Two numbers between 1 and 9999, in ascending order. |
| Library | A single name or asterisk (*) notation. |
| DBID | A numeric value between 0 and 65535, where 0 means all messages. |
| FNR | A numeric value between 0 and 5000, where 0 means all messages. |
| Language Code | A numeric value between 1 and 60. |
| Code Page | A single name or blank for all values. |
Enter either of the following SYSBPM direct commands:
GENERATE MPRELOADLIST list-name
or
GENERATE MPRELOADLIST list-name start-number end-number gen-library language dbid fnr codepage
(See also the explanations of field values above).
A message appears confirming that the preload list was generated from the message pool.
To delete a preload list
In the Preload List Maintenance menu,
enter function code L and the name of a preload list.
Or:
Enter the following SYSBPM direct command:
LIST PRELOADLIST list-name
for a preload list containing Natural object, or
LIST MPRELOADLIST list-name
for a preload list containing messages.
Or:
LIST MPRELOADLIST list-name
The List Preload Lists screen appears.
In the leftmost column, next to the object required, enter the following line command:
D
The DELETE window appears.
Confirm the deletion by entering the name of the preload list.
A confirmation message appears.
The Natural utilities SYSMAIN and Object Handler provide additional functions for maintaining preload lists. Functions include transferring preload lists between different Natural libraries and system files and/or different mainframe platforms and deleting or finding preload lists in a different environment.
When using a Natural utility, a preload lists is treated like any other source object of the type Text.
For details, refer to the relevant sections in the Utilities documentation.