I am designing a directory where data in multiple sources will have to override the data in other sources when altered or updated. Some of the databases are MySQL, SQL Server and some of the info will be AD/LDAP.
My question is this: is there a design pattern for this type of database propagation, to reduce traffic and prevent errors? Also this project will be in PHP, so if anyone knows of a similar open source project I could adapt from, that would be nice too. There will probably have to be some logic between some of the databases.
