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Quick Tips

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Eonclose CSV File With Fields Enclosed by Quotes

It's easy to export table data to a CSV file using vsql. Although there isn't a vsql option to enclose each output field in quotes, but you can accomplish that task with the Linux sed command. Once the formatting looks good, you can redirect the output to your CSV file: Helpful Links: Have fun!
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Define a Vertica Flattened Table Column as Having Both DEFAULT and SET USING Constraints

Columns in a flattened table can query other tables with constraints DEFAULT and SET USING . Vertica executes DEFAULT queries only on new rows when they are added to the flattened table, through load operations such as INSERT and COPY. Thereafter, changes in the original data sources have no effect on the flattened table. Vertica...
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Viewing Parquet Export Events More Easily

The EXPORT TO PARQUET command exports a table, columns from a table, or query results to files in the Parquet format. When you run EXPORT TO PARQUET information about the files created during the export is stored in the Vertica log. It's no fun combing through a Vertica log looking for those particular records. Good...
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Clearing the Screen in VSQL

Lots of old school folks use VSQL for administrative tasks. As you enter commands, eventually the command prompt will end up at the bottom left of the screen making it a little difficult to read any additional output from your commands. You can clear the screen and move the prompt back up to the top...
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Finding Patterns in Stock Prices With Vertica

Vertica can ingest data from many sources and enable SQL-based preparation and analytics. Here is another real-world example: Let's use Vertica to find patterns in a public data set of stock and (Exchange-Traded Fund) ETF prices from Kaggle. I’ll use the following data source in this post: This data source provides several thousand files for...
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Which Database Mode Is My Database Using?

You can run Vertica in either Eon Mode or Enterprise Mode. The primary difference between Eon and Enterprise Modes is where they store data. Eon Mode stores data in a shared object store called communal storage, while Enterprise Mode stores data across the filesystems of the database nodes. If you are working with a new...
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Moving a Table to a New Schema and Inheriting the New Schema Privileges

You can move a table from one schema to another schema with a simple ALTER TABLE command. But, you might be surprised that the table will not inherit the new schema’s privileges even if the new schema was created using the DEFAULT INCLUDE PRIVILEGES directive. After moving the table you will need to manually alter...

Are Your Columns too Wide?

This tip expands on the earlier post on encoding and compression at When you have millions to billions of rows, data type becomes a bit more important: even an extra 10 bytes per row across a huge data set will impact storage or performance (or both!). When I created the big_fact_table, I included some VARCHAR...

Checking and Improving Column Compression and Encoding

When working with terabytes of data, storage and transfer become major time and cost sinks. Vertica can help minimize storage cost and transfer time with column compression and encoding. How can we identify Vertica tables that might benefit from compression? Information about column size and current compression is stored across column_storage and projection_columns table. The...
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Get the Row Count from an Outer Table Join

Aggregate functions summarize data over groups of rows from a query result set. When using an aggregate function like COUNT with an "*" or "1" parameter value, you may get a different result when the query implements a LEFT join verses an INNER join. If you want a row count of just the rows from...
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DIRECT Is Now the Default Load Type

Write Optimized Store (WOS) is a memory-resident data structure for short-term data storage while Read Optimized Store (ROS) is a highly optimized, read-oriented, disk storage structure, organized by projection. Prior to Vertica 9.3, by default, Vertica initially loads data into WOS. For databases created in version 9.3 and later, Vertica now uses a default load...
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Vertica 9.3 Supports UPDATE and DELETE Operations on Tables Having Live Aggregate Projections!

A live aggregate projection contains columns with values that are aggregated from columns in its anchor table. When you load data into the table, Vertica aggregates the data before loading it into the live aggregate projection. On subsequent loads (for example, through INSERT or COPY) Vertica recalculates aggregations with the new data and updates the...