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Database Instance
The term instance is typically used to describe a complete database environment, including the RDBMS software, table structure, stored procedures and other functionality. It is most commonly used when administrators describe multiple
instances of the same database.Also Known As: environment
Examples: An organization with an employees database might have three different
instances: production (used to contain live data), pre-production (used to test new
functionality prior to release into production) and development (used by
database developers to create new functionality).
RELATION SCHEMA
A relation schema can be thought of as the basic information describing
a table or relation. This includes a set of column names, the data types associated
with each column, and the name associated with the entire table. For example, a
relation schema for the relation called Students could be expressed using the
following representation:
Students(sid: string, name: string, login:
string, age: integer, gpa: real)
There are five fields or columns, with names and types as shown above.
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What is external schema?
The role of the external schema is to support user views of data and thus to provide programmers with easier data access
How to Differentiate Thesaurus from Checking the spelling and grammar?
I'm not sure I understand what you mean by differentiate, but if you are using the grammar and spelling checker in Word, you have options. For instance, when the checker stops on questionable spelling and/or grammar, you can click to check grammar (uncheck if already checked). If you click on options on that page, you can choose your own rules by checking/unchecking the boxes. Hope this helps!
What is the data schema in a database?
Logical Structure of database is know as database schema. All database entities are defined and relation between then is represented in structured way. It includes all constraints to be apply on each identity.
What relation and relation schema?
Relational Schema refers to meta-data elements which are used to describe structures and constraints of data representing a particular http://wiki.answers.com/Describe_the_differences_in_meaning_between_the_terms_relation_and_relation_schema#. Whereas a relation is a property or predicate that ranges over more than one argumentHere's some translation from "Relational Algebra" to http://wiki.answers.com/Describe_the_differences_in_meaning_between_the_terms_relation_and_relation_schema#terminology:"Relation" = Table."Relation Schema" = Table definition.So for example, the "schema" for the Person "relation" is: Person(FirstName, LastName, Age, Gender, Address)Also in relational Algebra, a "tuple" is a table row, and an "attribute" is a table column.
Differentiate between transparent bridge and spanning bridge?
Differentiate between a simple bridge and transparent bridge
Difference between schema sub schema and instance in DBMS in detail?
the overall logical data base description is referred to as a schema. it is sometimes also referred to as an overall modal of the data, a conceptual modal of the data, a conceptual schema
What is the Difference between relation schema and relation instance?
difference between relation sehema and relation instance in dbms
What is schema instance?
In DBMS,Schema is the overall Design of the Database.Instance is the information stored in the Database at a particular moment.In programming,you declare a variable which corresponds to "Schema".But its values changes as and when required which corresponds to "Instance". Google about levels of Database Abstraction. Physical Schema describes database design at physical level while a logical schema describes the database design at the logical level.A database may also have several schemas at the view level, sometimes called subschemas, that describe different views of the database.
What is Schema and instances?
In DBMS,Schema is the overall Design of the Database.Instance is the information stored in the Database at a particular moment.In programming,you declare a variable which corresponds to "Schema".But its values changes as and when required which corresponds to "Instance". Google about levels of Database Abstraction. Physical Schema describes database design at physical level while a logical schema describes the database design at the logical level.A database may also have several schemas at the view level, sometimes called subschemas, that describe different views of the database.
What is star flake schema?
A starflake schema is a combination of a star schema and a snowflake schema. Starflake schemas are snowflake schemas where only some of the dimension tables have been denormalized. hardkingofflirt@gmail.com
What is schema and sub-schema?
The schema is the physical arrangement of the data as it appears in the DBMS. The subschema is the logical view of the data as it appears to the application program.
Explain the three schema architecture of DBMS?
Physical schema,logical schema and sub schemas
What part of speech is the word schema?
Schema is a noun.
What is schema in mysql?
Schema is structure you created for your tables in My SQL
Which holds writable copy of AD schema?
Schema Master
Why do you need mapping between schema levels?
There is need for mappings between schema levels for visualization and schema matching. The mappings between schema levels helps in the different types of transformation.
How can you differentiate a class from an object of a class?
A class is a collection of similar objects while an object is the individual instance of a class.
