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php4 problem when upgrade MySQL-server-4.1.12-1

Dear all,
i upgrade mysql DB to MySQL-server-4.1.12-1 when i do this it make problem to apache server i have this error from apache log

PHP Warning: Unknown(): Unable to load dynamic library '/usr/lib/php4/mysql.so' - /usr/lib/php4/mysql.so: undefined symbol: mysql_drop_db in Unknown on line 0
[Wed Jun 22 10:32:02 2005] [notice] Apache/2.0.46 (CentOS) configured -- resuming normal operations

so what can i do to make php work .
Note this error cause my perl application to give Internal Server Error when i restart the apacge server evry thing seems ok but after while it give me this error.

thank you.

Did you use a rpm to upgrade mysql.
Did you do this;

Code:

As root:

#/usr/bin/mysql_install_db

# /etc/init.d/mysql start

* Starting mysqld [ok]

#/usr/bin/mysql -u root

mysql>SET PASSWORD FOR 'root'@'localhost' = PASSWORD('your_new_password_here');

mysql>SET PASSWORD FOR 'root'@'hostname_or_dnsDomainName' = PASSWORD('its_new_password_here');

Or is this what you did?
http://dev.mysql.com/doc/mysql/en/linux-rpm.html