IBM 000-8697 Manual de usuario descargar pdf (Pagina 11)

Table of Contents xi

Chapter 5 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

Checkpoint Frequency ................ 5-20

Performance Tradeoffs .............. 5-20

How Is Tuning Done? .............. 5-21

Psort Parallel-Process Sorting Package .......... 5-22

How Psort Works ................ 5-22

Tuning Psort .................. 5-23

Psort and Shared Memory ............. 5-24

SPINCNT Conﬁguration Parameter ........... 5-24

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