I've the necessity to migrate from a 2.0 - HSQL installation to a 2.1 MySQL installation. I've tested a lot of methods but no one have been ok:
1) Use the MySQL Migration Toolkit to migrate from HSQL to MySQL –> The tool do a OutOfMemory (the HSQL database if 170MB large). 2) Copy alf_data to a "clear" installation of 2.1 –> Ok, but now I've the same problem. I've a 2.1 HSQL installation. 3) Export 2.0 HSQL –> the system don't do nothing 4) Export 2.1 HSQL (migrated from 2.0 HSQL before) –> ok, but when I want to import the data into a clear 2.1 MySQL installation I've some errors 5) Copy alf_data (from 2.1) to a "clear" installation of 2.9B –> I've some errors.
Alfresco don't support the MySQL migration tool - it might be worth your while asking on the MySQL forums about how to increase the memory allocated to their tool.