This COBOL system supports more than one type of indexed file. The tables below illustrate the different types available and
the features that they support.
Table 1. Indexed Files - Features Supported
| |
Supports Files Logically >4 Gb
|
Fast Updates on Files with Multiple Duplicate Keys
|
Maximum Occurrences of Duplicate Key Value
|
Support for Variable Length Records and Compression
|
Separate Index File
|
| IDXFORMAT"1"
|
No
|
No
|
65535
|
No
|
Yes
|
| IDXFORMAT"2"
|
No
|
No
|
65535
|
No
|
Yes
|
| IDXFORMAT"3"
|
No
|
No
|
65535
|
Yes
|
Yes
|
| IDXFORMAT"4"
|
No
|
Yes
|
4 G
|
Yes
|
Yes
|
| IDXFORMAT"8"
|
Yes
|
Yes
|
4 G
|
Yes
|
No
|
| IDXFORMAT"12"
|
Yes
|
Yes
|
4 G
|
Yes
|
Yes
|
Table 2. Indexed Files - Physical Characteristics
| |
Duplicate Occurrence Records
|
Data Record Alignment
|
File Pointer Size (bytes)
|
Residue Length Field
|
Index Node Includes Record Header
|
| IDXFORMAT"1"
|
No
|
1
|
4
|
n/a
|
No
|
| IDXFORMAT"2"
|
No
|
1
|
4
|
n/a
|
No
|
| IDXFORMAT"3"
|
No
|
4
|
4
|
2
|
No
|
| IDXFORMAT"4"
|
Yes
|
4
|
4
|
2
|
No
|
| IDXFORMAT"8"
|
Yes
|
8
|
6
|
4
|
Yes
|
| IDXFORMAT"12"
|
Yes
|
8
|
6
|
4
|
Yes
|