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MDEV-9082 - Debian: mysql_install_db is called on upgrade
A comment in debian/mariadb-server-10.1.postinst says: "can safely run on
upgrades with existing databases". While this is true there're a few reasons not
to do that:
- it increases installation time (it has to run rather heavy mysqld multiple times)
- as well as it increases mysqld downtime
- it may fail if database has some plugin specific configs (see MDEV-8437)
- there should be no need to run this script on upgrade: they should be handled
by mysql_upgrade to
- RPM postin doesn't call it if database directory exists
Also postinst is not supposed to create database directories: let
mysql_install_db do that intead.
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