Mainframe computers are computers used primarily by corporate and governmental organizations for critical applications, bulk data processing such as census, industry and consumer statistics, enterprise resource planning and transaction processing. Read more in the posts below…

DB2

IBM DB2 is a family of database server products developed by IBM. These products all support the relational model, but in recent years some products have been extended to support object-relational features and non-relational structures, in particular XML. Historically and unlike other database vendors, IBM produced a platform-specific DB2 product for each of its major […]

IMS command codes

Any SSA, qualified or unqualified, can include a command code. A command code provides still more information for the call. It may affect how the call function is performed, or it may affect the qualification of a segment. Command codes consist of an asterisk (*) followed by a letter. Use the following reference information for […]

Mainframe (Big Iron)

Mainframe computers (colloquially referred to as “big iron”) are computers used primarily by corporate and governmental organizations for critical applications, bulk data processing such as census, industry and consumer statistics, enterprise resource planning and transaction processing. The term originally referred to the large cabinets called “main frames” that housed the central processing unit and main […]

IMS return codes

For EXEC DL/I commands, all status codes, except those identified as being returned to the application program, cause an abnormal termination of the application program. All explanations apply to both DL/I call (call-level) programs and EXEC DLI (command-level) programs except where split. The term “request” means call, command, or both.   two blanks (bb) Explanation: […]