June 2018
Intermediate to advanced
478 pages
10h 52m
English
Content preview from IBM Db2 11.1 Certification Guide
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Data load best practices for BLU Column-Organized Tables
- Batch up the data, at least 1,024 records per insert.
- Set UTIL_HEAP_SZ to AUTOMATIC and over 1M pages.
- Consider presorting data on column(s) that will frequently appear in query predicates to improve compression ratios and synopsis effectiveness.
- Reduce total time required for the first load of the table by reducing the duration of the ANALYZE phase. This can be achieved by cdeanalyzefrequency and/or maxanalyzesize file type modifier in the LOAD command.
- cdeanalyzefrequency: Determines how frequently sample needs to be collected during Analyze phase.
- maxanalyzesize: Determines how much data is sampled in the Analyze phase and the default is 128 GB and can be modified and the value ...
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