Posted by: 
Dominique De Cooman

When you query your entities on values on a field, for example you want to get all nodes via a node reference field. In our case we have an event and we want to know all referenced sessions to it.

Database sharding and drupal

Database sharding and other high scalability features.

drupal 7 changes in the database api

Posted by: 
Dominique De Cooman

In one of my posts I told about a technique to use multiple drupals in one database using prefixes

There is nothing wrong with this technique IF you start off with that setup.

But if you have multiple sites and you ve ALLREADY developed your sites using multiple databases and you want them REUNITED in one database. You should be aware of the following issue:
Drupal 5 uses the sequences table to keep track of autoincrement of node ids user ids, etc...

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