When it comes to tuning a query, program, or even an application that most developers are not sure where to begin or what may be causing response time issue(s). This article is here to help!
Locking and latching are both key mechanisms employed by relational database management systems to ensure data integrity, consistency, and the serialization of resources. In the Db2 for z/OS IRLM manages the locks, but both Db2 and IRLM have internal latches.
With this month’s topic being “locking, concurrency and waits”, it may not be a bad time to review some of the locking basics. It might help your junior colleagues or your developers to get a better understanding.
Steve Thomas of CA Technologies presents a great introduction into the world of locks, latches, claims and drains. A must see for all developers working wit Db2 for z/OS as well as all DBAs wanting to refresh their knowledge.
Over the years, there has been a lot of evolution in DB2 for z/OS : packages, compression, datasharing, triggers, large objects, unicode support, memory management, PBG tablespaces …
DB2 helped DBA’s with the delivery of very nice features : RTS, bufferpool simulation, virtual indexes