MySQL : Open-Source, Relational Database Management System

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Clustered index performance consideration in MySQL & PostgreSQL

In MySQL/InnoDB, the clustered index is synonymous with the primary key, so picking up a poor primary key affect your db performance, i.e. use of UUID as PK is a performance killer for database write. ...
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what would be the primary disadvantages of splitting my tables into table spaces and/or separate schemata

I would like to organize the MySQL tables of a complex application into some groups, to avoid looking at a one big bin of tables. One big bin is harder to administrate when e.g. I would like to reset ...