June 2018
Intermediate to advanced
478 pages
10h 52m
English
Content preview from IBM Db2 11.1 Certification Guide
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Static row compression
Table row compression, sometimes referred to as static or classic compression, involves identifying repeating values and replacing them with a 12-bit symbol key. These keys are stored in a table-level dictionary, specific for that table. The dictionary is stored with the table data rows in the data object portions of the table. All data and log records, except for long data objects, are eligible for compression. To use data row compression with a table, two prerequisites must be satisfied:
- Compression must be enabled at the table level.
- A compression dictionary must be built for the table. Automatic Dictionary Creation (ADC) rules apply, in some cases.
A new table can be created with static row compression using the ...
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