It seems that i can't update a part of primary key in cqlsh update: message "PRIMARY Key part column found in SET part"
Sent using Zoho Mail ============ Forwarded message ============ >From : Xiangfei Ni <xiangfei...@cm-dt.com> To : "user@cassandra.apache.org"<user@cassandra.apache.org> Date : Mon, 28 May 2018 11:04:06 +0430 Subject : 答复: Re: cassandra update vs insert + delete ============ Forwarded message ============ Yes, you are correct. Best Regards, 倪项菲/ David Ni 中移德电网络科技有限公司 Virtue Intelligent Network Ltd, co. Add: 2003,20F No.35 Luojia creative city,Luoyu Road,Wuhan,HuBei Mob: +86 13797007811|Tel: + 86 27 5024 2516 发件人: onmstester onmstester <onmstes...@zoho.com> 发送时间: 2018年5月28日 14:33 收件人: user <user@cassandra.apache.org> 主题: Fwd: Re: cassandra update vs insert + delete How update is working underneath? Does it create a new row (because i'm changing a column of partition key) and add a tombstone to the old row? Sent using Zoho Mail ============ Forwarded message ============ >From : Jonathan Haddad <j...@jonhaddad.com> To : <user@cassandra.apache.org> Date : Mon, 28 May 2018 00:07:36 +0430 Subject : Re: cassandra update vs insert + delete ============ Forwarded message ============ What is a “soft delete”? My 2 cents, if you want to update some information just update it. There’s no need to overthink it. Batches are good if they’re constrained to a single partition, not so hot otherwise. On Sun, May 27, 2018 at 8:19 AM Rahul Singh <rahul.xavier.si...@gmail.com> wrote: -- Jon Haddad http://www.rustyrazorblade.com twitter: rustyrazorblade Deletes create tombstones — not really something to consider. Better to add / update or insert data and do a soft delete on old data and apply a TTL to remove it at a future time. -- Rahul Singh rahul.si...@anant.us Anant Corporation On May 27, 2018, 5:36 AM -0400, onmstester onmstester <onmstes...@zoho.com>, wrote: Hi I want to load all rows from many partitions and change a column value in each row, which of following ways is better concerning disk space and performance? 1. create a update statement for every row and batch update for each partitions 2. create an insert statement for every row and batch insert for each partition, then run a single statement to delete the whole old partition Thanks in advance Sent using Zoho Mail
