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Re: Error when switching to MariaDB


I was afraid of that, but I was too tired to experiment along those lines,
else I could have screwed up in a spectacular way.

I examined the 900+ lines of mysql.sql and found all the ALTER strings
were commented in C-style, but removing the CREATEs would have eliminated
some of the key purposes of the file's existence.  I decided to manually
repopulate the user table.

I successfully granted the permissions to the respective users (except one
that will require a string copy of mysql.user.authentication_string since
I'm not certain anymore of the locations of that particular password in
the configuration files (possibly in two locations).

Things have been mostly sorted out and I greatly appreciate the help.  I
still have a problem to sort out, but it is distinct enough that it
warrants a separate thread.

Thank you very much!

Timothy D. Legg

> On 6/6/2017 3:43 PM, Timothy D. Legg wrote:
>> Hello,
>> First of all, here is what I'm working with:
>> Original machine: MySQL Server 5.7.18-0ubuntu0.16.04.1
>> Destination machine: MariaDB 10.0.30-MariaDB-0+deb8u2
>> These two machines have no filesystem or communication with with other.
>> I am moving to MariaDB with about 10 to 15 databases that were created
>> in
>> MySQL and I have had a very odd problem with the destination machine
>> running MariaDB where the applications using these databases were having
>> connection errors with their databases.
>> I looked very carefully at what I had done.  I exported the databases
>> from
>> MySQL using:
>> $ mysqldump --all-databases > all.sql
> This is your problem.  You are overwriting the system tables with values
> which will not work in MariaDB 10.0.30.
> MySQL 5.7 permissions are, supposedly (I haven't tested), compatible
> with MariaDB 10.2, but not 10.0.
> In that all.sql file, remove any CREATE, DROP or ALTER statements to the
> mysql system database (which is the permissions system).
> Alternatively, do not dump the mysql system database and create those
> permissions by hand before the import using CREATE USER and/or GRANT
> statements.
> Brian
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