January 2005
Beginner to intermediate
928 pages
22h 14m
English
book
Understanding DB2®: Learning Visually with Examples
by Raul F. Chong, Clara Liu, Sylvia F. Qi, Dwaine R. Snow
Content preview from Understanding DB2®: Learning Visually with Examples
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16.10. The Explain Tool and Explain Tables
The explain tool examines the access plan chosen by the DB2 optimizer for your SQL statements. Explain information must be captured before you can review it using one of DB2's explain tools. While the query is being compiled, the information can be captured into a file or special tables known as explain tables. DB2 uses explain tables to store access plan information so that users can see the decisions that the optimizer has made. These explain tables are listed in Table 16.6.
| Table Name | Description |
|---|---|
| EXPLAIN_ARGUMENT | Represents the unique characteristics for each individual operator. |
| EXPLAIN_INSTANCE | Main control table for all explain information. Each row of data in the explain tables ... |
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