License Agreement. The initial value is 0. Appendix C. An MQT can be defined at table creation time as maintained by the system or maintained by the user. The query above can now be routed to the MQT in the query rewrite phase of the optimization, and its new access plan would look like the following:. In Figure 6. Without a replicated MQT, the access plan would look like the following. Conventions Used Throughout the Book. Creating an MQT that is to be maintained by the system connect to sample
Materialized query tables
The definition of a materialized query table (MQT) is based upon the result of a query. which are familiar to IBM® DB2® Universal Database™ (UDB) for C01 INFORMATION JOHN GEYER E You can create a materialized query table, which is defined by the result of a query, to improve the Begin general-use programming interface information.
Materialized query tables (MQTs) are tables whose definition is based on the from the tables that you specify in the materialized query table definition. Db2 For more information, see Creating a federated materialized query table.
An introduction to materialized query tables – IBM Developer
Rollforward Overview. If the optimizer determines that a query or part of a query could be resolved using an MQT, the query might be rewritten to take advantage of the MQT.
The staging table collects changes that need to be applied to synchronize the MQT with its underlying tables.
Other Important Configuration Parameters. View image at full size.
Fullselect statements that form part of the definition of materialized query tables ( MQTs) is subject to the following restrictions. (See the " REFRESH TABLE command" section for more information.) REFRESH IMMEDIATE means that DB2 changes the MQT every time the.
If the applications run multiple queries on orders for only the yearand only three columns from the table are used in these queries, such as:.
Listing 4 shows an example of using a staging table with a summary table.
Using Materialized Query Tables IBM Big Data & Analytics Hub
Database Communications. A materialized query table can be used to replicate tables to other database partitions to enable collocated joins, even when not all of the tables are joined on the partitioned key. TABDEP system catalog view contains a row for every dependency that a materialized query table has on some other object.
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