USER CONSTRAINTS
We can use describe command to view logical structure of the table. It displays table structure including column name, data type, size & not null constant. It does not provide information aboutRead More…
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Constraint Using ALTER TABLE
In our post “I/O Constraint” and “Business Constraints” we had seen how we can add constraints at the time of table creation using Create table command. If you have not read ourRead More…
Fragmentation
Fragmentation is the primary problem faced while allocating memory. In this article we will focus on Fragmentation and steps to minimize it. Fragmentation can be of two types: Internal Fragmentation External Fragmentation ExternalRead More…
Contiguous Memory Allocation
In our previous article we had explained about memory protection and in this post we will discuss about memory allocation techniques used by the operating system. This article deals with contiguous memoryRead More…
Memory Protection
Memory protection is required to ensure that different processes do not mix with each other’s code or data. Every memory address used by a process should be first checked to see whetherRead More…
Swapping
A process that need to be executed must be present into the memory. When there is not enough physical memory available for any process or page to be allocated then the operatingRead More…
Logical and Physical Address
In our previous post we had discussed about different address binding schemes. In this post we will discuss about logical and physical address and address spaces and how operating system deal withRead More…
Address Binding Schemes
In previous post, we had discussed about Interrupt Mechanism performed by operating system. In this post we will look at different address binding schemes used by operating system to generate and manageRead More…
Friend Function
We all know that as per the rule of encapsulation, We cannot access data members or member functions declared with the private scope specifier from outside the class. There are some casesRead More…
How to Modify File Upload Limit?
You might have faced situations where your current upload file size is not sufficient and you need to modify it to suite your requirement as default file upload size is limited uptoRead More…