Character set 'utf8mb4' is not a compiled character set and is not specified in the '/usr/share/mysql/charsets/Index.xml' file
Character set 'utf8mb4' is not a compiled character set and is not specified in the '/usr/share/mysql/charsets/Index.xml' file
Cannot connect to MySQL: DBI connect('med_data;host=127.0.0.1;mysql_read_default_group=client','root',...) failed: Can't initialize character set utf8mb4 (path: /usr/share/mysql/charsets/) at /usr/bin/pt-online-schema-change line 2281
更改/usr/share/mysql/charsets/Index.xml 内容，将
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<charset name="utf8">
<family>Unicode</family>
<description>UTF-8 Unicode</description>
<alias>utf-8</alias>
<collation name="utf8_general_ci" id="33">
<flag>primary</flag>
<flag>compiled</flag>
</collation>
<collation name="utf8_bin" id="83">
<flag>binary</flag>
<flag>compiled</flag>
</collation>
</charset>
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改为
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<charset name="utf8mb4">
<family>Unicode</family>
<description>UTF-8 Unicode</description>
<alias>utf-8</alias>
<collation name="utf8_general_ci" id="33">
<flag>primary</flag>
<flag>compiled</flag>
</collation>
<collation name="utf8_bin" id="83">
<flag>binary</flag>
<flag>compiled</flag>
</collation>
</charset>
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不光光pt-online-schema-change工具会遇到这个问题，其它工具也会，也是这么解决的。
转自 http://www.ttlsa.com/mysql/pt-online-schema-change-utf8mb4-error-solution/