Extreme Database programming with MUMPS Globals
... In this example, the data items that make up the employee details (name, position,
telephone number) have been appended together with the back-apostrophe character as a
delimiter. MUMPS does not impose any controls or rules over how you construct your
data structures : there’s no schema or data dict ...
Database Users and Administrators
... and indices, there will be variations in the performance from time to time. Also, because of
some designing issues or data growth, the database will not work as expected. It is responsibility
of the DBA to tune the database performance. He is responsible to make sure all the queries and
programs wor ...
data structure using arrays
... In computer science an array is a data structure consisting of a group
of elements that are accessed by indexing. In most programming
languages each element has the same data type and the array occupies a
contiguous area of storage. Most programming languages have a builtin array data type.
Some pro ...
MUMPS (Massachusetts General Hospital Utility Multi-Programming System) or alternatively M, is a general-purpose computer programming language that provides ACID (Atomic, Consistent, Isolated, and Durable) transaction processing. Its differentiating feature is its ""built-in"" database, enabling high-level access to disk storage using simple symbolic program variables and subscripted arrays, similar to the variables used by most languages to access main memory.The M database is a key-value database engine optimized for high-throughput transaction processing. As such it is in the class of ""schema-less"", ""schema-free,"" or NoSQL databases. Internally, M stores data in multidimensional hierarchical sparse arrays (also known as key-value nodes, sub-trees, or associative memory). Each array may have up to 32 subscripts, or dimensions. A scalar can be thought of as an array element with zero subscripts. Nodes with varying numbers of subscripts (including one node with no subscripts) can freely co-exist in the same array.Perhaps the most unusual aspect of the M language is the notion that the database is accessed through variables, rather than queries or retrievals. This means that accessing volatile memory and non-volatile storage use the same basic syntax, enabling a function to work on either local (volatile) or global (non-volatile) variables. Practically, this provides for extremely high performance data access.Originally designed in 1966 for the healthcare industry, M continues to be used today by many large hospitals and banks to provide high-throughput transaction data processing.