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Describe log based recovery
The most usably structure for recording data base modification is the LOG the log is a sequence of log records recording all the update activities in the data base. There are several types of log records. An update log records describes a single data base write it has these fields
Transaction identifier
Data item identifier
Old value
New value
The various types log records as.
Ø Deferred data base modification
Ø Immediate data base modification
Ø Check point
Ø Shadow paging
Explain the Recoverable Schedule A recoverable schedule is one in which for each pair of transactions Ti and Tj such that Tj reads a data item formerly written by Ti, the comm
Define Deadlock prevention These protocols make sure that the system will never enter a deadlock state. There are two methods to deadlock prevention. One approach makes sure t
Explain three main attributes of data.
Objectives Define the terms RECOVERY and INTEGRITY; Define Recovery Techniques; Explain Error and Error detection techniques, and Define types of Authorisation.
Database Errors: An error is said to have occurred if the implementation of a command to manipulate the database cannot be successfully finished either due to inconsistent data or
What is the aim of object design The aim of object design is to identify object which the system contains and the interactions among them. The system implements specification
What is called mirroring? The simplest approach to introducing redundancy is to duplicate each disk. This method is called mirroring or shadowing.
Hi, Do you offer private tuition for DBMS?
Consider a typical sales invoice that would include the following information. Design a single table to hold all of the information required to store an invoice including this info
E-R model uses this symbol to represent weak entity set ? A Doubly outlined rectangle symbol is used to represent weak entity set.
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