File Management - IBM

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Contents
About File Management . . . . . . . vii
Who should read the File Management book . . . vii
What’s new in V4R5 File Management . . . . . vii
Chapter 1. Introduction to File
Management . . . . . . . . . . . . . 1
File types . . . . . . . . . . . . . . . 1
Chapter 2. File processing . . . . . . . 3
File Management operations overview . . . . . . 3
File security considerations . . . . . . . . . 8
Object authority . . . . . . . . . . . . 8
Data authorities . . . . . . . . . . . . 9
Authorities required for file operations . . . . 10
Limiting access to files and data when creating
files . . . . . . . . . . . . . . . . 11
Sharing files . . . . . . . . . . . . . . 12
Open considerations for files shared in a job . . 13
I/O considerations for files shared in a job . . . 14
Close considerations for files shared in a job . . 15
Allocating file resources . . . . . . . . . . 15
File resource allocation . . . . . . . . . 16
File resources that must be allocated . . . . . 16
How the system allocates resources . . . . . 16
Opening files . . . . . . . . . . . . . . 17
Scoping of opened files . . . . . . . . . 18
Opening files using temporary file descriptions 18
Open considerations when using *LIBL with a
DDM file . . . . . . . . . . . . . . 20
Detecting file description changes . . . . . . 21
Displaying information about open files . . . . 22
Monitoring file status with the open and I/O
feedback area. . . . . . . . . . . . . 23
File error detection and handling by the system . . 24
Messages and message monitors in files by the
system . . . . . . . . . . . . . . . 25
Major and minor return codes in files by the
system . . . . . . . . . . . . . . . 26
Recovering from file system errors. . . . . . 28
Related information on file types . . . . . . . 31
Chapter 3. Using overrides . . . . . . 33
Overrides: An overview . . . . . . . . . . 33
Benefits of using overrides . . . . . . . . 34
Summary of the override commands . . . . . 34
Effect of overrides on some commands . . . . 35
Using overrides in multithreaded jobs . . . . 37
Applying overrides . . . . . . . . . . . . 37
Overriding file attributes . . . . . . . . . 38
Overriding file names . . . . . . . . . . 39
Overriding file names and file attributes. . . . 39
Overriding the scope of an open file . . . . . 40
How the system processes overrides . . . . . 40
Effect of exits on overrides: scenario . . . . . 48
Effect of TFRCTL on overrides-Scenario . . . . 49
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Overrides to the same file at the same call level:
scenario 1 . . . . . . . . . . . . . . 49
Overrides to the same file at the same call level:
scenario 2 . . . . . . . . . . . . . . 49
CL program overrides . . . . . . . . . . 50
Securing files against overrides . . . . . . . 51
Using a generic override for printer files . . . 51
Applying overrides when compiling a program 53
Deleting overrides . . . . . . . . . . . . 54
Deleting overrides: scenario 1 . . . . . . . 55
Deleting overrides: scenario 2 . . . . . . . 55
Displaying overrides . . . . . . . . . . . 57
Displaying all overrides for a specific activation
group: scenario . . . . . . . . . . . . 57
Displaying merged file overrides for one file:
scenario . . . . . . . . . . . . . . 58
Displaying all file overrides for one file: scenario 58
Displaying merged file overrides for all files:
scenario . . . . . . . . . . . . . . 58
Displaying overrides with WRKJOB: scenario . . 58
Displaying overrides: comprehensive scenario . . 59
Displaying overrides: tips . . . . . . . . 63
Redirecting files . . . . . . . . . . . . . 64
Planning for redirecting files. . . . . . . . 65
Redirecting files: tips . . . . . . . . . . 65
Default actions for redirected files . . . . . . 66
Chapter 4. Copying files . . . . . . . 69
Copying physical or logical files . . . . . . . 69
Copying files: overview . . . . . . . . . . 70
Copying files: commands . . . . . . . . . 70
Copying files: supported functions . . . . . 73
Copying files: basic functions . . . . . . . 76
Creating the to-file (CRTFILE parameter) . . . . 82
Specifying CRTFILE(*YES) on either the CPYF or
CPYFRMQRYF command. . . . . . . . . 83
Authorities, user profiles, and file capabilities of
the to-file created by Copy File (CPYF) . . . . 83
Adding, replacing, and updating records (MBROPT
parameter). . . . . . . . . . . . . . . 84
Specifying *REPLACE when copying files . . . 84
Specifying *ADD when copying files . . . . . 85
Specifying *UPDADD when copying files . . . 87
Copying records into files that use trigger
programs . . . . . . . . . . . . . . 88
Selecting members to copy . . . . . . . . . 88
Copying file members: overview . . . . . . 88
Allowed copy operations and parameters . . . 89
Copying all members or labels within a file . . 89
Copying only certain members or labels within a
file . . . . . . . . . . . . . . . . 90
Specifying the label identifier or member name
for the copy operation . . . . . . . . . . 90
© Copyright IBM Corp. 1998, 2000 iii