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Displaying posts with tag: silly advice given (reset)

Spreading .ibd files across multiple disks; the optimization that isn’t
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Inspired by Baron's earlier post, here is one I hear quite frequently -

"If you enable innodb_file_per_table, each table is it's own .ibd file.  You can then relocate the heavy hit tables to a different location and create symlinks to the original location."

There are a few things wrong with this advice:

  • InnoDB does not support these symlinks.  If you run an ALTER TABLE command, what you will find is that a new temporary table is created (in the original location!), the symlink is destroyed, and the temporary table is renamed.  Your "optimization" is lost.
  • Striping (with RAID) is usually a far better optimization.  Striping a table across multiple disks effectively balances the  'heavy
  •   [Read more...]
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