Reproduced in 5.1.43. Could not reproduce it in 5.0.66
From: Yang Zhang [mailto:yanghatespam@stripped]
Sent: Wednesday, February 17, 2010 6:05 PM
Subject: auto_increment weirdness
Hi, for some reason, I have an auto_increment field that's magically
bumped up to the next biggest power of 2 after a big INSERT...SELECT
that inserts a bunch of tuples (into an empty table). Is this expected
behavior? I couldn't find any mention of this from the docs (using the
MySQL 5.4.3 beta).
Small reproducible test case:
First, generate some data: from bash, run "seq 30000 > /tmp/seq"
Next, run this in mysql:
create table x (a int auto_increment primary key, b int);
create table y (b int);
load data infile '/tmp/seq' into table y;
insert into x (b) select b from y;
show create table x;
This will show auto_increment = 32768 instead of 30000.
Is this a bug introduced in the beta? Has it been fixed in newer
releases? Couldn't find a mention in the bug database. Thanks in
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