JCL – Environment Setup
Installing JCL on Windows/Linux There are many Free Mainframe Emulators available for Windows which can be used to write and learn sample JCLs. One such emulator is Hercules, which can…
JCL – Home
Job Control Language (JCL) is the command language of Multiple Virtual Storage (MVS), which is the commonly used Operating System in the IBM Mainframe computers. JCL identifies the program to…
IMS DB – Recovery
The database administrator needs to plan for the database recovery in case of system failures. Failures can be of many types such as application crashes, hardware errors, power failures, etc.…
IMS DB – Logical Database
IMS database has a rule that each segment type can have only one parent. This limits the complexity of the physical database. Many DL/I applications require a complex structure that…
SQL – Expressions
An expression is a combination of one or more values, operators and SQL functions that evaluate to a value. These SQL EXPRESSIONs are like formulae and they are written in…
IMS DB – Secondary Indexing
Secondary Indexing is used when we want to access a database without using the complete concatenated key or when we do not want to use the sequence primary fields. Index…
SQL – Operators
What is an Operator in SQL? An operator is a reserved word or a character used primarily in an SQL statement's WHERE clause to perform operation(s), such as comparisons and…
IMS DB – Data Manipulation
The different data manipulation methods used in IMS DL/I calls are as follows − ISRT CallGet Hold CallsREPL CallDLET Call Let us consider the following IMS database structure to understand…
SQL – Data Types
SQL Data Type is an attribute that specifies the type of data of any object. Each column, variable and expression has a related data type in SQL. You can use…
IMS DB – Data Retrieval
The various data retrieval methods used in IMS DL/I calls are as follows − GU CallGN CallUsing Command CodesMultiple Processing Let us consider the following IMS database structure to understand…
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