Hi,

It seems that the instructuons on
http://www.mysql.com/doc/en/Upgrading-from-3.23.html are contradicting
themselves, or I'm mistaken:

*** first snap ***
Ensure that you don't have any MySQL clients that uses shared libraries
(like the perl Msql-Mysql-modules). If you have, you should recompile them
as structures used in `libmysqlclient.so' have changed.
*****

*** second snap ***
MySQL 4.0 will work even if you don't do the above, but you will not be
able to use the new security privileges that MySQL 4.0 and you may run
into problems when upgrading later to MySQL 4.1 or newer.
*****

*** third snap ***
Old clients should work with a Version 4.0 server without any problems.
*****

Structures in libmysqlclient having been changed seems to be a serious
thing, so should or should not Msql-Mysql-modules be recompiled?


The real cause for the question lays in the problem which occured after I
upgraded to 4.0.3 WITHOUT recompiling DBI module: the new mysql version
worked without any visible errors, however it was unable to process more
than about 30 queries per seconds, while the normal rate for this server
is more than 100 queries/sec. How can it be so slow? Evidently something
went wrong, but what could it be?

Regards


----
Alexander Varshavchick, Metrocom Joint Stock Company
Phone: (812)118-3322, 118-3115(fax)


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