Checking Whether Tables or Indexes Must Be Rebuilt

Checking Whether Tables or Indexes Must Be Rebuilt
A binary upgrade or downgrade is one that installs one version of MySQL “in place” over an existing
version, without dumping and reloading tables:
1. Stop the server for the existing version if it is running.
2. Install a different version of MySQL. This is an upgrade if the new version is higher than the original
version, a downgrade if the version is lower.
3. Start the server for the new version.
In many cases, the tables from the previous version of MySQL can be used without problem by the
new version. However, sometimes changes occur that require tables or table indexes to be rebuilt,
as described in this section. If you have tables that are affected by any of the issues described here,
rebuild the tables or indexes as necessary using the instructions given in Section 2.11.4, “Rebuilding or
Repairing Tables or Indexes”.
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