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Re: Select last row that is less than or equal to a date
Posted by: Øystein Grøvlen
Date: February 01, 2013 06:03AM

My guess is that for some reason the MySQL server has decided during execution to divert from the original plan and then uses a temporary table for sorting. I would consider that a bug, and I think that several such issues have been fixed in MySQL 5.6.

Since I usually install from source, I am not an expert on how to install MySQL binaries. However, I think one do not have to uninstall 5.5 in order to install 5.6, but it depends on how you want to install it. I guess if you install a package that comes with a Linux distribution or use a Windows installer, it will, at least by default, replace older versions. However, I think it will work to download a tar distribution, unzip it, make a copy of your current my.cnf file, and within it set basedir to point to the 5.6 installation, and start the 5.6 mysqld program with option --defaults-file=<your modified my.cnf>

If you have problems installing 5.6, you can instead create a bug report and upload a reproducible test case, and we will look into it.

Øystein Grøvlen,
Senior Principal Software Engineer,
MySQL Group, Oracle,
Trondheim, Norway

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