March 2004
Intermediate to advanced
440 pages
11h 46m
English
book
DB2 UDB V8 and WebSphere V5 Performance Tuning and Operations Guide
by Whei-Jen Chen, Peter Z He, Kang Yong Ying, Andreas Paulsen, Sunminder S Saini
Content preview from DB2 UDB V8 and WebSphere V5 Performance Tuning and Operations Guide
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Chapter 3. Overview of DB2 UDB V8 63
Figure 3-9 Connection concentrator concept
Concurrency
Concurrency can be a reason for an application with a poor performance. DB2
UDB puts locks on data used by an application according to the
isolation level.
How restrictive these locks are depends on the isolation level. The isolation level
can be set for an application and depends on the kind and the needs of the
application. These levels are from restrictive to non-restrictive:
Repeatable Read (RR)
RR is the highest isolation level. Locks are held on all referenced rows of a
result set within a unit of work. RR guarantees that no changes can be made
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