MySQL 8.0 and PostgreSQL 11.0 with Live Projects using PHP 7.3 by Mittal Narendra Mohan

Author:Mittal, Narendra Mohan [Mittal, Narendra Mohan]
Language: eng
Format: mobi
Published: 2019-03-31T16:00:00+00:00

First Random Access DBMS

Disks, with random access memory, changed the game. Now data could be accessed nonsequentially. The Account record might still be read sequentially; however, its associated Orders could be read from a totally different file stored in ORDER NUMBER or some other sequence. You just had to find it among the myriad orders.

Random access was a great advance but a messy one. How do you find one record in a pile of a few thousand records? A simple and efficient way to retrieve a record was to use the record’s disk address. Every record on disk has an address telling the system where it lives. It might be something like disk 5, cylinder 3, platter 4, sector 6. Jump to that location and your record should be there. You just had to know 5, 3, 4, 6.

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