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From Jonathan Ellis <>
Subject Re: Why Cassandra is "space inefficient" compared to MySQL?
Date Tue, 25 May 2010 19:39:16 GMT
Yes.  But I haven't yet seen a workload with enough data that that
would matter, that wasn't more cpu bound than disk space bound, so that
would usually be premature optimization.

On Tue, May 25, 2010 at 2:23 PM, Robert Edmonds <> wrote:
> On 2010-05-25, Jonathan Ellis <> wrote:
>> That's true.  But fundamentally Cassandra is expected to use more
>> space than mysql for a few reasons; usually the biggest factor is that
>> Cassandra has to write out each column name in each row, since column
>> names are dynamic unlike in mysql where you declare the columns once
>> for the whole table.
> does this mean that using short column names (e.g., "f" instead of
> "first_seen") will save space when storing billions of rows?
> --
> Robert Edmonds

Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support

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