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Best Practices

Projection Delete Concerns

This blog post was authored by Curtis Bennett. Deletes in Vertica are a complicated topic. I’ve had many people say to me that they’d heard that one should never do deletes in Vertica, or that deletes in Vertica are slow. Nothing could be further from the truth. But like anything in a database, they should […]

Monitoring Login Failures

This blog post was authored by Curtis Bennett. Security is an ever-present topic on the minds of database administrators. Certainly Vertica has a number of security features like Kerberos, and SSL. This blog isn’t about those! Instead, let’s take a look at a much more simplistic aspect of security which Vertica tracks – login failures. […]

Aggregate Projections

This blog post was authored by Curtis Bennett. Vertica stores physical data for tables in objects known as projections. Unlike traditional RDBMS’s, Vertica does not rely on indexes for performance. Instead, Vertica stores the physical data (either all or some of the columns) in whatever sort order is required for optimal query processing. This can […]

Improve the Efficiency of Mergeout on Wide Tables

This blog post was co-authored by Xiao Ling and Jim Kelley. Introduction When resource pools were first introduced to Vertica, the average computer had a lot less memory than it does today. The default memory size for the Tuple Mover resource pool, 200 MB, reflects the more limited resources of that period. As hardware and […]

Identifying Projection Skew

This blog post was authored by Curtis Bennett. In Vertica, projections can either be replicated (unsegmented), or segmented. A segmented projection divides the data up across all the nodes in your cluster. Segmentation works by hashing a key value, and then using some simple math, figuring out which node that piece of data will live […]

What Projections are not Being Used

This blog post was authored by Eugenia Moreno. It is common to create new projections to improve performance in Vertica. However, you might forget about the old projections. Vertica still loads data in projections that you might not be using. A projection that is loaded but not picked up by the Vertica optimizer consumes storage […]

Beware of Segmentation Islands

This blog post was authored by Curtis Bennett. Many clients who are new to Vertica are also new to big data. While Vertica’s reliance on industry-standard SQL can make the transition very easy, often the introduction of multiple nodes used in support of a database platform can take some getting used to. It is the […]

Authentication Methods for dbadmin

This blog post was authored by Sumeet Keswani. In Vertica, when you create a new database, there are no configured authentication methods. In this case, Vertica assumes that all users, including the dbadmin, have an implicit password authentication. Users can use this authentication method both for authenticating over a network interface and for over a […]

Phrase Search with Vertica Text Search

This blog post was authored by Serge Bonte. Vertica Text Search Vertica already provides Text Search. Text Search allows you to quickly search the contents of a single CHAR, VARCHAR, LONG VARCHAR, VARBINARY, or LONG VARBINARY field within a table to locate a specific token. Vertica implements that capability using a dedicated Text Index to […]

CPU and Memory Starvation

This blog post was authored by Sumeet Keswani. What is Spread? Vertica uses an open source toolkit, Spread, to provide a high-performance control message service. Spread daemons start automatically when your database starts up for the first time. The spread daemons run on control nodes in your cluster. The control nodes manage message communication. On […]