May 2020
Beginner
564 pages
14h 9m
English
Content preview from Learn SQL Database Programming
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Choosing the right data type
It's essential to understand how storage usage affects your database. Most databases are stored on disk (with some exceptions that allow data to be stored in memory). When the database needs to fetch data for you, it needs to read from the disk and return results to you. This is where disk I/O comes into play. I/O stands for input/output, and it's the communication between a system or computer and a person or another system/computer. Disk I/O is the reads and writes that are happening against a disk, and its rate is dependent on the speed at which the data can be transferred from disk to memory. This is the time it will take to return the data for your query. The more data you request, the longer it's going to ...
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