June 2004
Intermediate to advanced
396 pages
9h 28m
English
book
Building and Scaling SAP Business Information Warehouse on DB2 UDB ESE
by Chuck Ballard, Andreas Christian, Theodor H. Kuebler, Rodrigo A. Schiavon
Content preview from Building and Scaling SAP Business Information Warehouse on DB2 UDB ESE
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Chapter 3. DB2 UDB ESE technical overview 73
3.4.4 Concurrency features
In this section we describe a number of DB2 features that can improve
concurrency.
Type-2 indexes
DB2 Version 8 adds support for type-2 indexes. The primary advantages of
type-2 indexes are:
They improve concurrency because the use of next-key locking is reduced to
a minimum. Most next-key locking is eliminated because
a key is marked
deleted instead of being physically removed from the index page
.
They support the multi-dimensional clustering feature; that is, they are
required for MDC tables.
A table must have only type-2 indexes before online table reorg and online
table load can be used against the table.
An index can be created on columns that have a length greate ...
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