To implement a large-scale, busy, or highly reliable database
application, to port substantial code from a different database
system, or to tune MySQL performance, it is important to understand
InnoDB locking and the InnoDB
transaction model.
This section discusses several topics related to
InnoDB locking and the InnoDB
transaction model with which you should be familiar.
Section 14.8.1, “InnoDB Locking” describes lock types used by
InnoDB.
Section 14.8.2, “InnoDB Transaction Model” describes transaction
isolation levels and the locking strategies used by each. It
also discusses the use of
autocommit, consistent
non-locking reads, and locking reads.
Section 14.8.3, “Locks Set by Different SQL Statements in InnoDB” discusses specific types of
locks set in InnoDB for various statements.
Section 14.8.4, “Phantom Rows” describes how
InnoDB uses next-key locking to avoid phantom
rows.
Section 14.8.5, “Deadlocks in InnoDB” provides a deadlock example,
discusses deadlock detection and rollback, and provides tips for
minimizing and handling deadlocks in InnoDB.