Hello Larry,

On 7/3/2013 11:27 AM, Larry Martell wrote:
> We recently changed from in memory files to InnoDB files. Today we
> noticed that in every server's data dir there is file called '1' that
> seems to get updated every time the iddata1 file gets updated. On some
> servers it's comparable in size to the iddata1 file, on other servers
> it's 10-15x larger, and on others it's 1/2 the size. What is this
> file. Googling revealed nothing about this.
>

That is not something an official MySQL build would do. Consult with the
person (or group) that compiled your binaries.

Now, if you have enabled --innodb-file-per-table and if you have named
your table '1' then that file is probably '1.ibd'. That would be
expected. But that seems unlikely based on your other details.

Did you also enable a separate undo log, perhaps? Although if you had,
it should be 'undo1' not just '1'
http://dev.mysql.com/doc/refman/5.6/en/innodb-parameters.html#sysvar_innodb_undo_tablespaces

So, that simple '1' file also seems unusual to me.

--
Shawn Green
MySQL Principal Technical Support Engineer
Oracle USA, Inc. - Hardware and Software, Engineered to Work Together.
Office: Blountville, TN

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