High angle view of Beijing Guomao.
You can use the LEAD_STORAGE_OID function to list the rows from a table that are located in a particular ROS container.
Example:
dbadmin=> \! cat /home/dbadmin/t1.txt
1
2
3
dbadmin=> \! cat /home/dbadmin/t2.txt
4
5
dbadmin=> \! cat /home/dbadmin/t3.txt
6
7
8
dbadmin=> CREATE TABLE t (c INT);
CREATE TABLE
dbadmin=> COPY t FROM '/home/dbadmin/t1.txt';
Rows Loaded
-------------
3
(1 row)
dbadmin=> COPY t FROM '/home/dbadmin/t2.txt' DIRECT;
Rows Loaded
-------------
2
(1 row)
dbadmin=> COPY t FROM '/home/dbadmin/t3.txt' DIRECT;
Rows Loaded
-------------
3
(1 row)
dbadmin=> SELECT storage_oid, storage_type, total_row_count
dbadmin-> FROM storage_containers
dbadmin-> WHERE projection_name = 't_super';
storage_oid | storage_type | total_row_count
-------------------+--------------+-----------------
45035996280187963 | ROS | 3
45035996280187975 | ROS | 2
45035996280187987 | ROS | 3
(3 rows)
dbadmin=> SELECT *
dbadmin-> FROM t
dbadmin-> WHERE lead_storage_oid() = 45035996280187963;
c
---
1
2
3
(3 rows)
dbadmin=> SELECT *
dbadmin-> FROM t
dbadmin-> WHERE lead_storage_oid() = 45035996280187975;
c
---
4
5
(2 rows)
dbadmin=> SELECT *
dbadmin-> FROM t
dbadmin-> WHERE lead_storage_oid() = 45035996280187987;
c
---
6
7
8
(3 rows)
Helpful Links:https://www.vertica.com/docs/latest/HTML/Content/Authoring/Glossary/ROSContainer.htm
https://www.vertica.com/docs/latest/HTML/Content/Authoring/SQLReferenceManual/SystemTables/MONITOR/STORAGE_CONTAINERS.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!
