Title: Should I use JISAM or isCOBOL ISAM Server (c-treeACE)?

Question:

What are the basic differences between JISAM and isCOBOL ISAM Server? What are the guidelines for choosing between them?

Answer:

Here are the benefits of each:

Veryant JISAM

isCOBOL Evolve supplies a high capacity, client/server, indexed ISAM file system called Veryant JISAM.

JISAM is written entirely in Java so it runs anywhere, even on a mobile phone.

Utility provided for basic file management
Utility provided for one-step migration of data files from Vision.
ODBC Driver for Windows
Maximum file size: 9+ exabytes (EB) (over 9 million terabytes)
Maximum number of keys: no limit
Maximum number of records: no limit
Maximum key length: 256 bytes
Maximum number of segments per key: 16
Maximum record length: 2 GB

Currently JISAM has the following limitations: transactions are not supported
native encryption and compression are not supported
variable length records are not supported, the maximum record size is always used

isCOBOL ISAM Server

isCOBOL ISAM Server is available when transaction management statements such as START TRANSACTION, COMMIT TRANSACTION and ROLLBACK are used in the COBOL application.

Written in C/C++, available on Windows, aix4, aix5-32, aix5-64, hpux, linux, macosx, sco, soli386, solsparc-32

Includes Client/Server
Full Transaction Support
ODBC Driver for Windows
Supports Live Backup
Memory file support
Includes several feature-rich management utilities
Utility provided for one-step migration of data files from Vision.
Maximum file size: 16,000,000 terabytes (16 Exabytes)
Maximum number of keys: no limit
Maximum number of records: no limit
Maximum key length: no limit
Maximum number of segments per key: 16
Maximum fixed record length: 65,535 bytes
Maximum variable record length: 2 GB

The basic guideline is to use isCOBOL ISAM Server only if you require transaction management. Otherwise, use JISAM. Use JISAM especially if you require a pure Java solution.

Authored by: Veryant Support on Fri, Aug 28th, 2009 at 7:00 PM
This question has been viewed 9082 times so far.
Online URL: http://support.veryant.com/support/phpkb/question.php?ID=7

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