回复： does copy command will clear all the old data?

[Peng Xiao <25...@qq.com>]

Thanks Nandan for the confirmation.I also did the test.




------------------ 原始邮件 ------------------
发件人: "@Nandan@"<na...@gmail.com>;
发送时间: 2018年2月13日(星期二) 中午12:52
收件人: "user"<us...@cassandra.apache.org>;

主题: Re: does copy command will clear all the old data?



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 <25...@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