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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.
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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.
Can you have multiple schema master or multiple PDC emulators in the same domain or forest?
No, you cannot have multiple schema masters or multiple PDC emulators in the same domain or forest. Each Active Directory forest has only one schema master, which is responsible for managing changes to the schema, and only one PDC emulator per domain, which acts as a primary time source and handles password changes and group policy updates. Having multiple instances of these roles would lead to conflicts and inconsistencies within the directory.
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.
Which holds writable copy of AD schema?
Schema Master
What is schema in mysql?
Schema is structure you created for your tables in My SQL
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.
Why should a sub schema be independent of schema?
I do not do not sens me something today
How do different schema definition languages support schema architecuret?
poda
What is a neural schema of a robot?
Neuron schema is brain of a robot in which the datas
What is a database schema?
A database schema is described in a formal language supported by the database management system (DBMS). In a relational database, the schema defines the tables, the fields in each table, and the relationships between fields and tables. Schemas are generally stored in a data dictionary. Although a schema is defined in text database language, the term is often used to refer to a graphical depiction of the database structure Levels of database schema 1. Conceptual schema, a map of concepts and their relationships 2. Logical schema, a map of entities and their attributes and relations 3. Physical schema, a particular implementation of a logical schema 4. Schema object, Oracle database object 5. Schema is the over all structure of the database
