Hi all

I was reading the High Performance MySQL book (by O'Reilly) and there
was mentioned that executing a count(*) is slower on the InnoDB
engine compared to the MyISAM engine, because InnoDB tables do not keep
track of the number of the records. I just wanted to know that if
this performance degradation is a feature of all transactional engines
(i.e. Oracle, DB2, PostgreSQL, ...) or it's just a weakness of the
InnoDB engines?

Best Regards,
Behrang S.

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