Note:
AOS in not able to modify file parameters for Adabas files
incorporated in Predict. This is because AOS cannot modify the FCB of these
files. Error messages are produced when such an attempt is made. We recommend
that you use Predict 4.5.1 to make file parameter updates for Adabas files
incorporated in Predict.
To modify parameters for a file
Select option "M" (modify file parameters).
Specify the number of the file to be modified.
If the file is protected, supply the password.
Press ENTER.
The Modify File Parameters screen is displayed:
10:19:39 ***** A D A B A S BASIC SERVICES ***** 2006-07-20
DBID 1955 - Modify File Parameters - PFLM002
File No. ... 1
File Name .. EMPLOYEES
-----------------------------------------------------------------------------
Max. Allocation
ASSO PFAC ...... 10 UI Blks per extent .. 0
DATA PFAC ...... 10 NI Blks per extent .. 0
Max. RECL ...... 4816 DS Blks per extent .. 0
New File Name .. EMPLOYEES______ ISN Reuse ............. OFF
New File No. ... 1 with RESET ..... ___
in Parallel .... NO
User ISN ....... OFF DS Reuse .............. ON_
with RESET ..... ON_
File Password .. in Parallel
Mixed DS Device........ OFF
AlphaNum Encoding .. 0 Program Refresh ....... OFF
WideChar Encoding .. 0
PF1----- PF2------ PF3------ PF4------ PF6----- PF7----- PF8----- PF12-----
Help Exit Menu |
This function corresponds to the utility function ADADBS MODFCB.
If large object (LOB) flags are set, the following screen is displayed:
16:55:50 ***** A D A B A S BASIC SERVICES ***** 2006-08-25
DBID 1956 - Modify File Parameters - PFLM012
File No. ... 16
File Name .. LOBFILE
-----------------------------------------------------------------------------
Max. Allocation
ASSO PFAC .......... 10 UI Blks per extent .. 0
DATA PFAC .......... 10 NI Blks per extent .. 0
Max. RECL .......... 5060 DS Blks per extent .. 0
New File Name ...... LOBFILE__________ ISN Reuse ............. ON_
New File No. ....... 16 with RESET ..... ___
in Parallel .... NO_
User ISN ........... OFF DS Reuse .............. ON_
with RESET ..... ___
File Password ...... in Parallel .... NO_
Mixed DS Device ....... OFF
AlphaNum Encoding .. 0 Program Refresh ....... OFF
WideChar Encoding .. 0
PF1----- PF2------ PF3------ PF4------ PF6------ PF7----- PF8----- PF12-----
Help Exit LOB Info Menu |
If you press PF4 on the screen when it displays a LOB file, a pop-up window appears showing detailed information abou the file:
- LOB File Information - ***************** * File 16 * ***************** File Info: LOB file Related LOB File Number ....... 15___ PF3--- Cancel |
The equivalent direct command is
MODIFY FILE file-number
This document covers the following topics:
Using the ASSO PFAC and the DATA PFAC fields on the Modify File Parameters screen, you can change the Associator and Data Storage padding factors for the file.
The "padding factor" is the percentage (%) of each Associator or Data Storage block that is reserved; that is, not loaded. This area is used to create new records later. The range is from 3 to 90 percent. The factor size allocated should depend on the amount of updating that is expected. The number of bytes left in the Associator after padding must exceed the largest descriptor value by at least 10.
Using the Max Allocation fields on the Modify File Parameters screen, you can change the maximum number of blocks that can be allocated for Data Storage (field DS Blks per extent), the normal index (field NI Blks per extent), or the upper index extent (field UI Blks per extent).
The value specified must be specified in blocks and cannot be more than 65535. If one of the parameters is either not specified or specifies "0", the maximum secondary extent allocation for that component has no limit.
In all cases, however, Adabas enforces minimum secondary allocations for these parameters:
DS Blks per extent=6 NI Blks per extent=6 UI Blks per extent=15
If you specify a value lower than these minimum allocations, the Adabas-enforced minimum value is used.
Using the Max. RECL field on the Modify File Parameters screen, you can change the maximum compressed record length allowed.
Using the New File Name and New File No. fields on the Modify File Parameters screen, you can change the name or number of the file.
The equivalent direct commands are
RENAME FILE file-number
RENUMBER FILE file-number
You can also turn off or on several file options on this screen:
User ISN ISN Reuse ...with RESET Data Storage Reuse ...with RESET Mix Data Storage Dev Program Refresh
ISN Reuse and Data Storage Reuse determine whether ISNs and Data Storage blocks for deleted records are reused as new records are added to the file. The equivalent direct commands are
REUSE ISNS file-number
REUSE DS file-number
When setting either of these two options to "ON", you can also set the RESET option "ON" to start the search for an unused ISN or Data Storage block at the beginning of the file.
If the file was loaded using universal encoding support (UES), the code values may be changed on this screen using the AlphaNum Encoding and WideChar Encoding fields.
