Group items tagged

In a relational world duplication is removed in order to prevent update anomalies. Error prevention is the driving force in relational modeling. Normalization is a kind of ethical system for data.

BigTable data ethics are more Mardi Gras than dinner with the in-laws. Data just wants to have fun. BigTable won’t stop you from hurting yourself. And to get the best results you may have to engage in some conventionally risky behaviors.

Originally my application started out using Spring MVC and JDO. The first use of JDO took my application about 5 seconds to get everything set up.  Similarily, Spring MVC added around 6 seconds to the cold start  time

 If you are not using either JDO or JPA, you can safely delete all related libraries (ones that have JDO, JPA, or Datanucleus in their name) and use the command line tool to upload your app. Deleting these libraries shaves about 400ms off of cold start time.

You can use the RemoteDatastore class to upload or download from a   normal Java application to your local or a remote datastore.  It takes   care of setting up a dummy Environment and ApiProxy.Delegate for you.   You can then use then read local files unrestricted and use the low- level api to insert your data. http://code.google.com/p/remote-datastore/ You just need to call RemoteDatastore.install() and ignore the other   steps about connecting to a remote datastore.