by Craig S. Mullins | Jul 13, 2023 | index, performance
Indexes play a crucial role in improving query performance when accessing data in a Db2 database. By creating indexes on specific columns, the Db2 optimizer can more quickly locate the desired data, reducing the need for full table scans and enabling faster query...
by Craig S. Mullins | Dec 13, 2021 | design, include columns, index, performance, sql
One of the constant struggles with Db2 development, and indeed developing for any relational DBMS, is designing and creating appropriate indexes. Perhaps the most important thing you can do to assure optimal application performance when accessing data in a...
by Use the Index Luke | Oct 21, 2020 | index
Some database—namely Microsoft SQL Server, IBM Db2, and also PostgreSQL since release 11—offer an include clause in the create index statement. The introduction of this feature to PostgreSQL is the trigger for this long overdue explanation… read...
by Craig S. Mullins | Dec 18, 2019 | clustering, index, primary key, uniqueness
In general, creating indexes to support your most frequent and important Db2 SQL queries is a good idea. But the size of the table will be a factor in decided whether to index at all and/or how many indexes to create.For tables more than 100 (or so) pages, it usually...
by Craig S. Mullins | Dec 18, 2019 | clustering, index, primary key, uniqueness
In general, creating indexes to support your most frequent and important Db2 SQL queries is a good idea. But the size of the table will be a factor in decided whether to index at all and/or how many indexes to create.For tables more than 100 (or so) pages, it usually...
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