A partial overview of Netezza database software technology | DBMS 2 : DataBase Management System Services
Netezza is having its user conference Enzee Universe in Boston Monday–Wednesday, June 21-23, and naturally will be announcing new products there, and otherwise providing hooks and inducements to get itself written about. (The preliminary count is seven press releases in all.) To get a head start, I stopped by Netezza Thursday for meetings that included a 3 ½ hour session with 10 or so senior engin
Index-only scans - PostgreSQL wiki
Index-only scans are a major performance feature added to Postgres 9.2. They allow certain types of queries to be satisfied just by retrieving data from indexes, and not from tables. This can result in a significant reduction in the amount of I/O necessary to satisfy queries. During a regular index scan, indexes are traversed, in a manner similar to any other tree structure, by comparing a constan
How does CLUSTER ON improve index performance - Postgres OnLine Journal
CLUSTER Basics One of the features in PostgreSQL designed to enhance index performance is the use of a clustered index. For people coming from MS SQL Server shops, this may look familiar to you and actually serves the same purpose, but is implemented differently and this implementation distinction is very important to understand and be aware of. In PostgreSQL 8.3 the preferred syntax of how you cl
Index-Only Scans
VP, Chief Database Scientist @ EnterpriseDB, PostgreSQL Major Contributor and Committer There seems to be a lot of interest in the as-yet-unimplemented performance feature called index-only scans, so I thought it would be useful to explain a little bit more about what this feature is, how it will help PostgreSQL, and where the bodies are buried. First, the name. What do we mean by an index-only s
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Introduction To Netezza | PDF | Boolean Data Type | Data Type
How are index-only scans implemented in InnoDB?