In <list-7611426@2rosenthals.com>, on 08/09/23
    at 12:09 PM, "Massimo S." <ecs-isp@2rosenthals.com> said:

Hi all,

Here's the mysql upgrade procedure that worked for me

==============================
== mysql_upgrade 5.1 -> 5.6 ==
==============================

  - Tested with mysqld
      Ver 5.1.73 for pc-os2-emx on i386 (Source distribution)
    and
      Ver 5.6.51 for OS2 on i386 (Source distribution)

  - The following assumes
      5.6 datadir will be /data/mysql56
      5.1 datadir is /data/mysql51
      innodb_data_home_dir is /data/mysql56-data/innodb
  - Use names that match your setup

  - Open session with current directory set to 5.6 bin directory
    Run binaries from the directory

  - Verify my.cnf is 5.6 compatible

    Edit as needed to protect/hide 5.1 data

  - Create /data/mysql56
  - Create /data/mysql56/mysql
  - Create /data/mysql56/innodb
  - Copy /data/mysql51/mysql to /data/mysql56/mysql
  - Run
      mysqld --console
    The server should start
    There will be warnings

  - Run
      mysql_upgrade

    The server may crash
  - If the server crashes, run
      mysqld --console
    to restart the server
    There will be warnings
    Run
      mysql_upgrade
    to retry the upgrade
    The upgrade should run without errors
    if not get help

  - Copy the rest of the 5.1 databases to /data/mysql56
  - Run
      mysql_upgrade --force
    to upgrade these databases
    The upgrade should run without errors
    If not get help

  - Run
      mysqlcheck --all-databases
    to cross-check upgrade results

  - Check /data/mysql56/mysql_upgrade_info
    It should contain 5.6.51

The logs imply that, at least in my case, only the mysql database needed
unusual modifications.  The log output for all the other databases and
tables reported OK with no additional messages or warnings.

Steven