King] The DBMS DBMS • Database Management System – DBMS – Specialized software design for the sole purpose of providing services to store, manage, and query data in an efficient manner Task #1 – Create new DB • A DBMS allows a DB administrator to specify the DB schema – Schema is a DB blueprint – Uses some type of data definition language (DDL) – Is usually a part of the query language (e.g., SQL) – Example: Task #2 – Allow querying data • Query languages are used to request specific data from databases – Sometimes called a Data-Manipulation Language (DML) • Examples: – SQL – very common; especially for relational databases – XQuery – used for XML repositories Task #3 – Large amounts of data • A modern DBMS must handle an enormous amount of data efficiently • It must be scalable • It must be reliable and offer persistence – (i.e.keep the data around for a LONG time) Task #4 - Durability • A DBMS must be resilient in the face of: – Hardware failure – Periods of heavy use • Must still be responsive • Think – Amazon in December!• Simple user database for a system admin Flat file • Discuss advantages / disadvantages – HINT – consider an order management system.
King] The DBMS DBMS • Database Management System – DBMS – Specialized software design for the sole purpose of providing services to store, manage, and query data in an efficient manner Task #1 – Create new DB • A DBMS allows a DB administrator to specify the DB schema – Schema is a DB blueprint – Uses some type of data definition language (DDL) – Is usually a part of the query language (e.g., SQL) – Example: Task #2 – Allow querying data • Query languages are used to request specific data from databases – Sometimes called a Data-Manipulation Language (DML) • Examples: – SQL – very common; especially for relational databases – XQuery – used for XML repositories Task #3 – Large amounts of data • A modern DBMS must handle an enormous amount of data efficiently • It must be scalable • It must be reliable and offer persistence – (i.e.
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