You need to understand how your application works and what resources are 

needed. There are probably a lot of characteristics of your application that 

influence your system planning and the scope of the migration effort.

The main information for collection during the application assessment incudes:

Application architecture

  Standalone

  Client/server

  Tie  r architecture

Database architecture

  Number of databases

  Number of tables

  Number of indexes

  Users, access rights and privileges

Size of data stored in the database

  Bytes stored in system tables (users)

  Bytes stored in tables

  Bytes stored in indexes

  Log file size

Source code language

  PHP

  Perl

  Java

  C/C++

  any other programming language

Database interface

  Direct database access through API

  Database access layer like ODBC/JDBC

Operating system

  Linux

  AIX, UNIX

  Windows

  any other operating system

Used hardware

  CPU

  Memory

  Hard disk

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MySQL to DB2 UDB Conversion Guide