Vertica Blog

Vertica Blog

Best Practices

MERGE Statement with Filters

Soniya Shah, Information Developer
August 23, 2017

This blog post was authored by Soniya Shah. Vertica 8.1 introduced new functionality for the MERGE statement. In this post, we discuss new functionality for MERGE that allows users to filter conditions on INSERT and UPDATE clauses in a MERGE statement. The MERGE operation allows users to join the target table on another table, a...
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Configuring tcp Idle Settings for Long Running Idle Sessions

Soniya Shah, Information Developer
August 14, 2017

This blog post was authored by Soniya Shah. Important: For all recommendations to changing setting values, you must change the settings on all nodes in the cluster. It is not advisable to have different settings on different nodes. Have you ever encountered one of the following types of errors? With each of these errors, the...

Understanding Backup Space Utilization

Soniya Shah, Information Developer
July 10, 2017

This blog post was authored by Soniya Shah. Creating regular database backups is an important part of database maintenance. The vbr utility lets you back up, restore, and copy your database to another cluster. You can create full and incremental backups, and even back up objects, such as tables. Ideally, backups should match what is...

Concurrency and Workload Management

Soniya Shah, Information Developer
June 26, 2017

This blog post was authored by Soniya Shah. Vertica workloads range from simple primary key lookups to analytical queries that include several large tables and joins. Different types of load jobs must keep the data updated. Vertica has a mixed-workload management capability that is easy to use. Vertica can process queries both concurrently and in...

How to Set Vertica in Read-Only

Soniya Shah, Information Developer
June 19, 2017

This blog post was authored by Soniya Shah. You probably know that you can create READ ONLY users in Vertica. These users can view everything within a schema, but don’t have the proper permissions to change anything within the database. This is useful for sets of users that don’t need as many permissions or for...

Getting Rid of Range Joins

Soniya Shah, Information Developer
June 1, 2017

This blog post was authored by Soniya Shah. You can use range joins to categorize data into buckets. Vertica provides performance optimizations for =, and BETWEEN predicates. These optimizations are particularly useful when a column from one table is restricted to be in a range specified by two columns of another table. Range joins can...
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Query Optimization Using Projections

Sarah Lemaire, Manager, Vertica Documentation
May 18, 2017

In Vertica, tables are logical representations of the data. Vertica stores the actual data in projections. When data is loaded into a Vertica table, Vertica creates or updates a column-store projection. Vertica also compresses and/or encodes projection data, optimizing data access and storage. If you experience performance issues, your best first step is to run...

Filtering Data While Loading into Vertica

Sarah Lemaire, Manager, Vertica Documentation
March 22, 2017

Suppose you have a CSV file and you want to copy some, but not all, of its contents into a Vertica table. There are two ways you can to do this: • Use the SKIP keyword with COPY. • Use the head or tail Linux command. Let's see how this works. The Data Here's a...

Best Practices for Using LDAP Link with Vertica

Sarah Lemaire, Manager, Vertica Documentation
November 1, 2016

There are a few best practices that you should follow to make sure that you don't accidentally lose any users or data. This blog explains how to keep your LDAP Link service working smoothly.

Troubleshooting Vertica Query Performance with System Tables

Sarah Lemaire, Manager, Vertica Documentation
August 29, 2016

Do you want to learn how to troubleshoot your query performance issues?  We've got you covered. Just attend
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Do You Need to Put Your Query on a Budget?

Sarah Lemaire, Manager, Vertica Documentation
July 6, 2016

Before we scare you away with the word "budget", rest assured that after reading this blog, you won?t have to give up your favorite activities or sell your car. What you will be able to do is understand how Vertica resource pool parameters affect query budget.

Restoring Objects from a Full Backup

Sarah Lemaire, Manager, Vertica Documentation
November 24, 2015

Before Vertica version 7.2, you had two options: perform full backups and restore full backups (remove everything from the storage unit) or perform object-level backups and restore those individually (maintain separate storage units). But as of Vertica 7.2, you can have the best of both worlds. You can perform full backups and restore individual objects...