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Extra info for DB2 Version 8: The Official Guide
To improve their performance, DB2 UDB v8 adds support for the RUNSTATS utility over DGTTs. Application programmers can now invoke the RUNSTATS utility to update statistics about the physical characteristics of a DGTT and its associated indexes. There is no change required for the syntax of the RUNSTATS command. Just ensure that you identify the DGTT with the SESSION schema as with all other operations on these tables. indextemptable on columns (id) DB2 UDB v8 does not support the viewing of statistics on DGTTs or their associated indexes.
Because these are defined dimensions on our example MDC table, DB2 UDB knows that block indexes exist for these dimensions and would choose to use them to arrive at the result set. In the previous query, DB2 UDB did an index lookup on the dimension block indexes, block ANDed the two indexes, and performed a minirelational scan of the resulting blocks, yielding great performance benefits. 14. 14. Dimension block ANDing for quick results with MDC. Suppose you have created an index on a business value that was not defined as a dimension when the MDC table was created.
All of these queries will be directed (and consequently must be handled) by that one node, while the other nodes sit idle, responding to requests for the data that they own. Therefore, there are often performance issues with Range partitioning. In a Hash partitioning scheme, as implemented by DB2 UDB, these issues do not arise because each database partition owns a piece of the data set described by the Part 2: Performance 33 34 Part 2: Performance partitioning key. Using MDC and DB2 UDB Enterprise Server Edition's Database Partitioning Feature, you could create Range partitions that are hashed over many tables or that are segregated to reflect the preceding example.