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From Robert Coli <>
Subject Re: Updating only modified records (where lastModified < current date)
Date Wed, 13 May 2015 19:22:23 GMT
On Wed, May 13, 2015 at 4:37 AM, Peer, Oded <> wrote:

>  The cost of issuing an UPDATE that won’t update anything is compaction
> overhead. Since you stated it’s rare for rows to be updated then the
> overhead should be negligible.

It's also the cost of seeking into tables which contain the row fragment.

UPDATE with identical timestamp is generally speaking an anti-pattern in
log structured immutable storage; only acceptable if done very rarely...
probably not if done every hour.


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