I need some help, my problem is that i setup alfresco version 4.0 in my computer, by default it install a postgreSQL database then i want to switch to Mysql database without reinstalling alfresco,because i prefer to developpe ander Mysql rather then postgreSql.
You need to stop the server Create MySQL alfresco database with script provided with setup. change your configuration to point to new MySQL alfresco database http://wiki.alfresco.com/wiki/Database_Configuration
set indexing mode to full in alfresco-global.properties.
Restart the server it should reindex all your contents in new database.