XML documents. It differs from HTML, the markup language most often used to present information on the Internet. HTML has fixed tags that deal mainly with style or presentation. An XML document must undergo a transformation into a language with style tags under the control of a style sheet before it can be presented by a browser or other presentation mechanism. Two types of style sheets used with XML are CSS and XSL. Typically, XML is transformed into HTML for presentation. Although tags can be defined as needed in the generation of an XML document, a document type definition (DTD) can be used to define the elements allowed in a particular type of document. A document can be compared by using the rules in the DTD to determine its validity and to locate particular elements in the document. A Web services application's J2EE deployment descriptors are expressed in XML with schemas defining allowed elements. Programs for processing XML documents use SAX or DOM APIs.

This language is to specify the internal schema. This language may specify the mapping between two schemas.

It is a process of analysing the given relation schemas based on their Functional Dependencies (FDs) and primary key to achieve the properties

Ø Minimizing redundancy

Ø Minimizing insertion, deletion and update anomalies.

It guarantees that the spurious tuple generation does not occur with respect to relation schemas after decomposition.

Dataset.Clone() will copy just the dataset structure including all the datatables, schemas, relations and constraints; it will not copy the data. Dataset.Copy() will copy both dataset structure and data.

Contains
  ->   one or more data files.
  ->   one or more control files.
  ->   two or more redo log files.
  ->   configuration file is very very important..that sets all parameters..
Database contains
  ->   multiple users/schemas
  ->   one or more rollback segments
  ->   one or more tablespaces
  ->   Data dictionary tables
  ->   User objects (table,indexes,views etc.,)
Server that access the database consists of
  ->   SGA  (Database  buffer,  Dictionary  Cache  Buffers,Redo log buffers, Shared SQL pool)
  ->   SMON (System MONito)
  ->   PMON (Process MONitor)
  ->   LGWR (LoG  Write)
  ->   DBWR (Data Base Write)
  ->   ARCH (ARCHiver)
  ->   CKPT  (Check Point)
  ->   RECO
  ->   Dispatcher
  ->   User Process with associated PGS