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Sams Teach Yourself MySQL in 21 Days, Second Edition
book

Sams Teach Yourself MySQL in 21 Days, Second Edition

by Tony Butcher
December 2002
Beginner content levelBeginner
640 pages
16h 41m
English
Sams
Content preview from Sams Teach Yourself MySQL in 21 Days, Second Edition

What Is Table Locking?

Imagine that you have a busy database. Perhaps it's an online store, and clients are performing read and write accesses almost constantly. While some clients are trying to read data from a table (for example, to see what products are available), others are trying to insert data or perform an update (to place an order).

Assume that you have a table containing the stock levels in the online store. There's a table called stock_level, and in it there are columns called product_id, to identify the product by ID, and qty, which holds the current quantity in stock for each item.

If a customer tries to order an item, the server application checks the quantity in stock by running a SELECT query on this table. If the number in stock ...

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Publisher Resources

ISBN: 0672323923Purchase book