Main Memory Database

Main Memory Database Systems prabakaran.t@lakshyasolutions.com Architect and Founder – CSQL MMDB http://www.csqldb.com

DBMS Types DRDB Disk Based Database Management System Stores data in disk Buffer frequently accessed data to memory MMDB Main Memory Database Management System Complete data is stored in memory No buffer manager required http://www.csqldb.com

DRDB VS MMDB Fully cached DRDB != MMDB Data structures are designed for disk based access rather than main memory data access Access mechanisms (Hash, Tree, etc) are optimized for disk access rather than main memory DRDB involves lot of data copies DRDB provides client/server connections whereas MMDB provides embedded mode http://www.csqldb.com

DBMS Products Disk Based Database Management System Oracle DB2 MySQL Postgres Main Memory Database Management System CSQL Timesten http://www.csqldb.com

MMDB is better than DRDB Hardware trend: CPU speed, memory & Disk capacity grows 80%/yr ● Memory performance grows 10%/yr ● Disk speed remains same ● Price of memory continues to drop ● •Access time for main memory is orders of magnitude less than that of disk. (100ns VS 10 ms) •Application queries require random access most of the time(point lookups) •Data resides permanently on main memory. No disk I/Os •No buffer manager overhead •Data Structures and algorithms are designed for memory access rather than disk access http://www.csqldb.com

CSQL MMDB Performance: Developed from scratch keeping one thing in mind- performance. Direct access to data: uses shared memory architecture User Level Mutexes: Hand written using atomic instructions Custom Allocators : Fixed and Variable Size Allocators Embedded Architecture: No network overhead, no data copies Tightly coupled: code segments which are performance critical are tightly coupled to avoid data copies http://www.csqldb.com

CSQL Features •Fully ACID Transactions •Highly concurrent •Fault Tolerant •Multi user – Authentication •Multi granular locking – Database, Table, Row •Hash Index, Tree Index •Aggregates and Inner Join •Client / Server and Embedded mode •JDBC 3.0 and ODBC 3.0 compliant CSQL is 30 times faster than DRDB Visit http://www.csqldb.com for benchmark results http://www.csqldb.com

Thank You www.csqldb.com http://www.csqldb.com

Main Memory Database

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