SQL Query Size Limit?

Moderator: NorbertKrupa

Post Reply
Posts: 42
Joined: Thu Apr 19, 2012 9:03 pm

SQL Query Size Limit?

Post by billykopecki » Fri Jan 08, 2016 2:38 pm


Anyone know if there is a limit on the size of a query that can be executed in Vertica? If so, what is the limit?

I may have to write a query with a bunch of unions and am curious how many I can string together...

Thanks in advance!

User avatar
Site Admin
Site Admin
Posts: 1825
Joined: Sat Jan 21, 2012 4:58 am

Re: SQL Query Size Limit?

Post by JimKnicely » Fri Jan 08, 2016 4:35 pm


As far as I know, there is no explicit limit defined in Vertica for the length (number of characters) of a SQL query.

There is a DB parameter that limits the max memory allowed for parsing:

Code: Select all

dbadmin=> select default_value, description from configuration_parameters where parameter_name = 'MaxParsedQuerySizeMB';
 default_value |                                                              description
 512           | Maximum amount of memory allowed for parsing a single request; Increasing this value may help with 'Request size too big' errors (MB)
(1 row)
Keep in mind the larger the query the worse they will perform. So I wouldn't mess with that parameter and I would try to keep the query sizes manageable.

Jim Knicely


Note: I work for Vertica. My views, opinions, and thoughts expressed here do not represent those of my employer.

Post Reply

Return to “Vertica SQL”