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5
Chapter
How to Improve Performance
In This Chapter . . . . . . . . . . . . . . . . . . . .
5-3
Disk Layout . . . . . . . . . . . . . . . . . . . . .
5-4
Optimize Blobspace Blobpage Size . . . . . . . . . . . . .
5-5
tbcheck -pB and tbcheck -pe Utility Commands
. . . . . . .
5-5
Blobpage Average Fullness . . . . . . . . . . . . . . .
5-7
Apply Effective Criteria . . . . . . . . . . . . . . . .
5-8
Eliminate User-Created Resource Bottlenecks. . . . . . . . . .
5-8
When Is Tuning Needed?. . . . . . . . . . . . . . . . .
5-10
% Cached Fields . . . . . . . . . . . . . . . . . .
5-10
ovtbls, ovlock, ovuser, and ovbuff Fields . . . . . . . . . .
5-11
Bufsize Pages/IO Fields . . . . . . . . . . . . . . . .
5-11
Shared-Memory Buffers . . . . . . . . . . . . . . . . .
5-13
When Is Tuning Necessary?
. . . . . . . . . . . . . .
5-13
How Is Tuning Done?
. . . . . . . . . . . . . . . .
5-13
Shared-Memory Resources . . . . . . . . . . . . . . . .
5-14
When Is Tuning Necessary?
. . . . . . . . . . . . . .
5-14
How Is Tuning Done?
. . . . . . . . . . . . . . . .
5-15
Log Buffer Size . . . . . . . . . . . . . . . . . . . .
5-15
Logging Status . . . . . . . . . . . . . . . . . . .
5-15
How Is Tuning Done?
. . . . . . . . . . . . . . . .
5-16
Page-Cleaner Parameters . . . . . . . . . . . . . . . . .
5-17
Efficient Page Cleaning . . . . . . . . . . . . . . . .
5-17
How Is Tuning Done?
. . . . . . . . . . . . . . . .
5-19
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