Example:
dbadmin=> CREATE TABLE test (a VARCHAR(10000), b VARCHAR(10000), c VARCHAR(10000), d VARCHAR(10000), e VARCHAR(10000));
CREATE TABLE
dbadmin=> CREATE PROJECTION test_pr
dbadmin-> (a ENCODING BZIP_COMP,
dbadmin(> b ENCODING GZIP_COMP,
dbadmin(> c ENCODING ZSTD_COMP,
dbadmin(> d ENCODING ZSTD_FAST_COMP,
dbadmin(> e ENCODING ZSTD_HIGH_COMP) AS
dbadmin-> SELECT a, b, c, d, e
dbadmin-> FROM test;
CREATE PROJECTION
dbadmin=> INSERT /*+ DIRECT */ INTO test
dbadmin-> SELECT REPEAT('A', 10000),
dbadmin-> REPEAT('A', 10000),
dbadmin-> REPEAT('A', 10000),
dbadmin-> REPEAT('A', 10000),
dbadmin-> REPEAT('A', 10000);
OUTPUT
--------
1
(1 row)
dbadmin=> SELECT column_name, used_bytes, encodings, compressions
dbadmin-> FROM column_storage
dbadmin-> WHERE projection_name = 'test_pr';
column_name | used_bytes | encodings | compressions
------------+------------+-----------+--------------
a | 70 | String | bzip
b | 53 | String | gzip
c | 40 | String | zstd
d | 41 | String | zstd fast
e | 39 | String | zstd high
epoch | 48 | Int_Delta | none
(6 rows)
Helpful Link:
https://www.vertica.com/docs/9.2.x/HTML/Content/Authoring/SQLReferenceManual/Statements/encoding-type.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!
