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Transactions - Two Phase Locking - Cascading Rollbacks | Database Tutorial 7e

In this lecture of the databases course we consider cascading rollbacks in the two phase locking protocol. If transaction 1 is aborted (rolled back), and transaction 2 has read a value written by transaction 1 (this is a dirty read), then transaction 2 needs to be aborted as well. We will also learn about cascadeless schedule and recoverable schedules. 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.