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Quick Tips

Checklist for Inconsistent Execution Time of Same Query in Eon Mode

Sruthi Anumula, Senior Database Support Engineer
September 6, 2023

In Eon Mode, when a query is executed and if the ROS containers associated to the tables in the query are not present in depot, it will fetch results from the communal storage bucket. In the next immediate run, the query should provide results to the user from the files present in the depot. However,...

Vertica’s Server-Based Replication

Moshe Goldberg, Vertica System Engineer
July 28, 2023

Empowering Seamless Data Copying in Vertica Eon Mode Overview In our latest installment of exploring the untapped potential of Vertica, we delve into the exciting new feature introduced in version 23.3 - Server-Based Replication. This cutting-edge functionality allows users to efficiently copy data from one Eon Mode database to another, revolutionizing the way data replication...
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Using Fall Through Authentication

Sruthi Anumula, Senior Database Support Engineer
July 21, 2023

If a user tries to login using their credentials and the authentication fails, the user cannot login using other authentication methods. A simple example could be a user who was configured with hash authentication. Later, TLS authentication was introduced and granted to all users or in other words granted to the PUBLIC with higher priority....

How To Filter a Behavioral Pattern in a Time Series

Marco Gessner, Field Chief Technologist
July 14, 2023

Behavioral patterns in time series are something that many analysts are keen to find in time series. A clickstream analyst wants to find the series of clicks that happened between coming to the website, browsing one or more articles in the web site, and finally filling the basket and checking out; a financial analyst wants...
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How to Use Database Designer to Optimize Vertica Physical Data Model in Six Steps

Maurizio Felici, Field Chief Technologist
June 16, 2023

Vertica provides out-of-the-box a powerful tool to tune its Physical Data Model: Database Designer (DBD from now on). You can run DBD using the Management Console GUI but in this article we will focus on what they call “programmatic interface” (read... plain SQL) and – as practical examples are often more enlightening than “theoretical” documentation...

Creating Iceberg External Tables in Vertica

Sruthi Anumula, Senior Database Support Engineer
June 1, 2023

From Vertica 12.0.4 onwards, we support creating external tables with parquet files in Apache Iceberg Table format. Iceberg is a high-performance table format which uses advanced filtering techniques and provides better performance by avoiding file listing. The striking feature of the external Iceberg tables is that there is no need to specify columns when defining...

Load Balancing on Elastic Kubernetes Clusters

Sruthi Anumula, Senior Database Support Engineer
March 7, 2023

Your long-running sessions could fail after you deployed Vertica on Elastic Kubernetes Cluster (EKS) with Load Balancer as the service type. When the load balancer type is not specified in yaml, by default, EKS generates a classic load balancer with a default connection idle timeout of 60 seconds. The aws-load-balancer-connection-idle-timeout can be set up to...
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Restrict Modifying Table Rows (UPDATE/DELETE) Irrespective of User Privileges

Sruthi Anumula, Senior Database Support Engineer
February 14, 2023

Do you have a table with critical information such as SIEM events or credit card transactions? Do you want to be able to block user access to UPDATE/DELETE rows in those tables? From version 12.0.0, you can do this by setting the tables as IMMUTABLE. This means you can only insert data and not modify...
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High Availability for a Vertica in Eon Mode Database with Read-Only Mode

Sruthi Anumula, Senior Database Support Engineer
January 9, 2023

When Vertica is deployed in Eon Mode, there are two major requirements for high availability: maintaining quorum and shard coverage. If either of them is lost, the whole cluster goes down. Before going into details, let us understand what quorum and shard coverage mean. Quorum: In Eon Mode, more than half of the primary nodes...

How to Quickly Install Vertica on Large Clusters

Sruthi Anumula, Senior Database Support Engineer
December 19, 2022

Vertica 12.0.2 introduces a new feature that allows you to install Vertica in parallel on all hosts rather than one at a time as in earlier releases. This reduces the installation time in large clusters. To use this feature, run the --parallel-no-prompts flag with the install_vertica command. This flag can be used only when passwordless...
SQL Query Optimization

Improving COUNT DISTINCT Performance with Approximate Functions

Bryan Herger, Vertica Big Data Solution Architect at Micro Focus
November 16, 2022

A common analytic use case is to find the number of distinct items in a data set. Vertica performs well at solving COUNT DISTINCT in a few ways. Since Vertica stores all data in columns, it is possible to optimize for COUNT DISTINCT by building a projection that is tuned for this use case. Vertica...