Hi Peng, Copy command will append upsert all data [based on size] to your existing Cassandra table. Just for testing, I executed before for 500000 data by using COPY command into small cql table and it work very fine.
Point to make sure :- Please check your primary key before play with COPY command. Thanks On Tue, Feb 13, 2018 at 12:49 PM, Peng Xiao <2535...@qq.com> wrote: > Dear All, > > I'm trying to import csv file to a table with copy command?The question is: > will the copy command clear all the old data in this table?as we only want > to append the csv file to this table > > Thanks >
