Transactions - Isolation Levels in SQL | Database Tutorial 7h

In this lecture of the databases course we learn about the different isolation levels in the SQL standard: read uncommitted (also dirty read or browse), read committed (also cursor stability), repeatable read and serializable. Choosing a lower (still acceptable) isolation level for queries is an important port of database tuning (optimizing the performance of a database system). Moreover, we will learn about the phantom row anomaly.

This is the databases online course given at the Vrije Universiteit Amsterdam by Jörg Endrullis. The course objective is to obtain a good understanding of relational database systems from the user perspective. This includes the ability to develop conceptual database models, as well as key concepts and skills in relational database theory and practice.

Among others, we treat in this course the following subjects:
(a) entity–relationship diagrams for the design of database schemata,
(b) the relational database model and integrity constraints,
(c) SQL (structured query language) for retrieving information from relational databases,
(d) database normalisation and functiona dependencies (reasoning about good database design),
(e) transactions and concurrency control.

The slides are based on work by Peter Boncz and Torsten Grust.