isCOBOL Evolve : SDK User's Guide : Files Management : Indexed Files : JISAM : Versions
Versions
The JISAM file system included in isCOBOL is version 2.
isCOBOL 2009 and previous versions support an old version of JISAM, version 1. If you need to share data with old versions isCOBOL, you can instruct the program to create JISAM 1 files by setting the following property in the configuration:
iscobol.jisam.version=1
Be aware that JISAM 1 has more limitations and does not perform as well as JISAM 2, so the above setting should be used only if necessary.
The table below lists the differences between the two versions of JISAM..
 
JISAM 1
JISAM 2
maximum file size
2 GB
9 EB
maximum record size
32 KB
2 GB
maximum number of keys
no limit
no limit
maximum key size
255 bytes
255 bytes
max number of segments per key
8
16
maximum number of records
no limit
no limit