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 51
Prefetchers retrieve data from disk and move it into the buffer pool before
applications need the data.
Page cleaners move data from the buffer pool back
out to disk. The page cleaners are working in the background to look for no
longer needed dirty pages and write them to disk.
All changes to regular data (any data type except BLOBs, Long VARCHAR, and
data in Global Temporary tables) and index pages are written to the
log buffer.
The data in the log buffer is written to disk by the
logger. The mechanism of
logging the database changes allows you to recover the data to the point of
failure when a system crash is encountered.
The
deadlock detector checks if a deadlock situation occurred. A deadlock is
created ...
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