May 2020
Beginner
564 pages
14h 9m
English
Content preview from Learn SQL Database Programming
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Understand the concepts of locking, blocking, and deadlocking
Locking is what happens when a query runs against a database. There are read locks and write locks:
- Read locks: Allow other queries reading data (SELECT) to read as well.
- Write locks: Other queries can't read or write data until the write (INSERT, UPDATE, DELETE) query is complete.
Blocking can happen when one or more queries holds a lock on the same data. Deadlocking can happen when each query locks data that the other query needs.
For example, when you run a query, MySQL has to decide how to get the data from the table(s). If your table has no index, the query will need to scan through the entire table to find the data, much the same way you would have to scan through an ...
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