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Can anyone explain TokuDBs seemingly large amount of data_free for an append only table?

I have a large table I've been maintaining replicating in parallel in innodb in one slave and tokudb in another. I'm seeing promising results in expected compression ratios but am noticing something ...
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Install MariaDB 10 Generic Binaries + TokuDB

I used to install MariaDB from Generic Binaries on a Debian Wheezy 64bits: mariadb-10.0.13-linux-x86_64.tar.gz (from downloads.mariadb.org) I would like to use TokuDB as Storage Engine. However, ...
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Missing rows in MyISAM tables with 10-20 billion records

I've got 2 tables with 10-20 billion records each. Currently these are in MyISAM (MySQL). They only require to be built and indexed once, after this only SELECT is used. They are currently ...
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TokuDB fails to load in MariaDB, even when transparent hugepages are disabled

Earlier, I upgraded my website server to Ubuntu 14.04 LTS. I had a very nice setup with MariaDB and the TokuDB engine. However, the setup was kind of messed up when TokuDB refused to load properly, ...