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System level permissions: With the use of data dictionary you can view them.
Let us take the table name as user_sys_privs (used in oracle).
DESCRIBE USER_SYS_PRIVS ;
SELECT * FROM USER_SYS_PRIVS ;
All these commands are very definite to a data base system and may be dissimilar on dissimilar DBMS.
DATABASE OBJECTS: VIEWS, SEQUENCES, INDEXES AND SYNONYMS
Some of the important concepts in a database system are the views and indexes.
Views are a mechanism that can support data independence and security. Indexes help in better query responses. Let us discuss about them along with two more concepts sequences and synonyms in more details.
What is a hash index? A hash index organizes the search keys, with their associated pointers, into a hash file structure.
What is the State Machine Engine The straightest approach to implement control is to have any way of explicitly representing and executing state machines. With the help of thi
Sparse and Dense Indexes These indexes in principle are the similar as that of indexes used at the back of the book. The key facts of the indexes are: They are arranged
How do I begin
Saving Derived Attributes to Avoid Re-computation Data that is derived from other data should be stored in the computed form to avoid re-computation. For this, we could define
A constraint named less_than_20 was defined on the field date_of_birth of table student. Delete this constraint. ALTER TABLE student DROP CONSTRAINT less_than_20;
Secondary Indexes Let consider the student database and its clustering index and primary (only one will be applicable at a time). Now consider the state when the database is to
It can be easily defined as: The database must not have any unmatched foreign key values. The term "unmatched foreign key value" means a foreign key value for which there doe
What is the major advantage of object-oriented programming paradigm? The ability to modify the explanation of an object without affecting the rest of the system is the main adv
Define multivalued dependency and 4NF. Ans: Multivalued Dependency - Assume R be a relation schema and let α ⊆ R and β ⊆ R. The multivalued dependency α →→β holds o
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