Group latches are held while ever any record level lock is held in this group. This is an "informational" lock, a quick way to determine whether exclusive access can be had to the group. It also keeps track of any waiters, from which the deadlock daemon can build lock waiter tables.
Group read and group write locks are held only while data are actually in transition between disk and memory (or vice versa). There are two other kinds of group latch, used only by UniVerse SQL. Enrol on the next UniVerse Theory and Practice (UV910) - formerly UniVerse Internals - class to get the whole story! ------- u2-users mailing list u2-users@listserver.u2ug.org To unsubscribe please visit http://listserver.u2ug.org/
