AI News, Design of Main Memory Database System/Overview of MMDB

Design of Main Memory Database System/Overview of MMDB

In addition to maintaining data consistency, these applications require timely response for the transactions accessing database.

Main memory databases, which became feasible recently with the increasing availability of large cheap memory, can provide better performance and consistent throughput than disk based database systems.

In effect, for disk-based systems, standard deviation for throughput will be huge and real time applications will not be able to benchmark against that unpredictable throughput.

This led to the development of new type of database management system called, Main memory database (MMDB) system.

As the basic underlying assumption changed in this type of database management system, it leads to research and design of each and every component of storage, relational and sql engine of the traditional disk based management system.

One disk block transfer takes approximately 5 milliseconds whereas main memory access takes 100 nanoseconds.

By keeping the whole database in memory, these disk I/Os are converted to memory access, thereby improves the throughput by many-folds.

This is because the data structures and access algorithms are designed for disk based system and cannot work well when whole database is completely in memory.

Though the complete database is in main memory, backup copy is kept in disk to enable recovery in the event of crash.

In case of MMDB, physical entity that corresponds to database is either shared memory segment or memory mapped file.

Usually the control information is stored separately from the data records to avoid data corruption of control information.

Control Segment containing lock table, process table, transaction table, undo logs and redo logs.

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