One method to avoid all that output is to enclose your query in a SELECT COUNT query. But that method doesn’t show the real time it takes to format the output. A better solution is to divert the output to /dev/null!
Example:
dbadmin=> \timing on
Timing is on.
dbadmin=> SELECT COUNT(*)
dbadmin-> FROM (SELECT COUNT(*)
dbadmin(> FROM tiny_table
dbadmin(> JOIN big_table
dbadmin(> USING (c1)) foo;
COUNT
-------
1
(1 row)
Time: First fetch (1 row): 2119.499 ms. All rows formatted: 2119.529 ms
A better way to get more accurate timings is to send all the output to /dev/null!
dbadmin=> \o /dev/null
dbadmin=> SELECT * FROM tiny_table JOIN big_table USING (c1);
Time: First fetch (1000 rows): 35.897 ms. All rows formatted: 14035.126 ms
dbadmin=> \o
Helpful Link:https://www.vertica.com/docs/latest/HTML/Content/Authoring/ConnectingToVertica/vsql/ExportingDataUsingVsql.htm
Have fun!
About the Author
James Knicely
Vertica Field Chief Technologist
I've had the privilege of working with many database technologies in my career. But after being introduced to Vertica in May of 2011 as a client, I was hooked on the new technology after witnessing a query run in milliseconds that had previously ran for hours on the legacy database we had in place. It was then that I knew I wanted to eventually join the Vertica team, and 4 years later I did! I am currently a Vertica evangelist and am ready to help you get on board! Please feel free to reach out to me with any questions you have about Vertica and make sure to follow my Vertica Quick Tips!
