Introduction of Apache web server
Introduction of Apache webserver · Software that accepts your request to access a web page of web sites and provides them. · Works just like a restaurant host . · Performs tasks as host and server. · Most widely used webserver software. · Developed and maintained by Apache software foundation. · The name origin…
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Versions of PHP
Versions of PHP PHP started from PHP/FI & PHP/FI 2.0 PHP FI stands for Personal Home Page and Form Interpreter. It deals with processing forms, sending SQL statements, and Flow control. Though objects it supports associative arrays, variables, and functions. It enabled people to upload both binaries as well as text files. Features of PHP/FI …
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Deadlock in DBMS
Deadlock in DBMS A deadlock is a condition where two or more transactions are waiting indefinitely for one another to give up locks. Deadlock is said to be one of the most feared complications in DBMS as no task ever gets finished and is in waiting for state forever. Deadlock conditions (Coffman conditions) Coffman specified four conditions for a dead…
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Starvation in DBMS
Starvation in DBMS Starvation or Livelock is the situation when a transaction has to wait for an indefinite period of time to acquire a lock. Reasons for Starvation – · If the waiting scheme for locked items is unfair. ( priority queue ) · Victim selection. (the same transaction is selected as a victim repeatedly ) · Resource leak. · Via denial-of-…
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Validation Based Protocol (optimistic concurrency control technique) in DBMS
Concurrency Control techniques in DBMS Multiple transactions executing at the same time on the same data may affect the result of the transaction. In order to maintain concurrent access to transactions, different protocols are introduced. Lock Based Protocol Time-Stamp Based Protocol Validation Based Protocol Validation…
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