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Explain concurrency control?
Concurrency control
Oracles multiversion concurrency control varies from the concurrency mechanism used by some other data base vendors. Read only queries are given a read -consistent snapshot which is view if the data base as it existed at the particular point in time, having all update that we were committed by that point in time and not containing any updates that were not committed at any point in time therefore read clock are not used in read only queries don't interfere with other data base activity in term of locking.
Managed stand by data base
To make sure high availability oracle provide a managed stand by data base future A stand by data base is a copy of the regular data base i.e. in solved on the separate system. If a catastrophic failure occur on the primary system, the stand by system is activate and take over there by minimizing effect on failure on a availability. Oracle keeps the stand by data base up to date by constantly applying archived redo logs that are shipped from the primary data base the back up data base can be brought online in readonly mode and used for reporting and decision support queries
Question: The following relational database schema corresponds to a part of a database used by the Registry Department of a university. DEPARTMENT (d#, d-name, head-of-dept)
The Assessment page has a link to download a conceptual model, and a list of data. You are to map this conceptual model, and create the database in Oracle using your own DDL. T
Need for Multiple Access Paths In practice, most of the online information systems need the support of multi-key files. For example, consider a banking database application hav
which component of DBMS can be embedded in a program? The data manipulation language (DML) is a component which is embedded in a program.
Define instance and schema? Instance: Collection of data stored in the data base at a certain moment is Schema: The overall design of the data base is known as the data base
crete a data base relationship model Entity: Students; Professors; Dormitories buildings; Attributes of students: Name; Address; Dorm;
Section A: Use the following tables to create a database called College. Use SQL commands. Student stuid(primary) lastName firstName
What is an index? An index is a structure that helps to place desired records of a relation quickly, without probing all records.
Strong entity set and weak entity set? Strong entity set and weak entity set: A strong entity set has a primary key. All tuples in the set are distinguishable through that key.
Limitations of File Based System The file-based system has some limitations. The limitations are listed as follows: Isolation and separation of data: When the data is
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