License Agreement. Access plans will be discussed in more detail later in this chapter, so this section will examine only the relevant pieces of the explain plan. Khatri Published on August 16, A staging table allows incremental maintenance support for the deferred MQT. Incremental maintenance provides significant performance improvement. If all of the records for a given date are being deleted from the base table, as in the statement:. Information Management.
The definition of a materialized query table (MQT) is based upon the result of a query.
Materialized query tables
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.
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Db2 For more information, see Creating a federated materialized query table.
Incremental maintenance provides significant performance improvement. However, it may still make sense for infrequently updated larger tables to be replicated if the one-time cost of replication can be offset by the performance benefits of collocation.
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Information Management. Appendix A. Chapter 5.
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To populate the MQT, create an index on it and update the table's and index's statistics, using the following commands:. Registry Variable Tuning. MDC Indexes. Access plans will be discussed in more detail later in this chapter, so this section will examine only the relevant pieces of the explain plan.
Backup Overview. The data that is contained in an MQT is derived from one or more tables on which the materialized query table definition is based.
Fullselect statements that form part of the definition of materialized query tables ( MQTs) is subject to the following restrictions.
Comparing DB2 materialized query tables and Oracle materialized views
(See the " REFRESH TABLE command" section for more information.) REFRESH IMMEDIATE means that DB2 changes the MQT every time the.
Listing 3 shows a simple example of creating a summary table.
Appendix J. For this example, the MQT should be created as follows:. Installing the DB2 Server. Security Implementation and Usage. Availability Enhancements.
the ability to maintain the MQT without the need to access the modified base table, only using the delta information (newly inserted/updated/deleted data) and. DB2 for LUW Offering Manager, IBM Knowledge of MQTs is tightly integrated into the IBM DB2 SQL and XQuery compilers.
DB2 10 Performance Creating a materialized query table
Using current database statistics, the DB2 optimizer, snapshot monitor information, and/or a.
Performance Tuning. The next section describes how MQTs can provide effective performance improvements in a database. Ability to Use db2dart. A staging table allows incremental maintenance support for the deferred MQT. Chapter 1.
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