June 2018
Intermediate to advanced
478 pages
10h 52m
English
Content preview from IBM Db2 11.1 Certification Guide
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MQT
A Materialized Query Table (MQT) is a table that is defined on the result of a SQL statement. It is generally used to avoid repetitive calculations by storing pre-computed aggregated results in the table. If the Db2 database manager determines that a portion of an SQL statement can be resolved using an MQT, the database manager will rewrite the access plan to use the appropriate MQT on behalf of a regular base table. This process is very transparent to the application or the end user.
It is a two-step process to create and maintain an MQT. First, create an MQT based on the needs of the business logic, and then refresh the data in the MQT table. If you want to build an MQT to record the SUM of SALES_AMOUNT for each SALES_DATE, you can ...
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