Installing a database management system
When you install the Push Service SDK, you can specify that you want to store SDK data in a database instead of system memory. If you choose to store SDK data in a database, you need to install a database before you install the SDK.
If you're using the high-level APIs, you can use system memory or a database, but if you send a lot of push messages we recommend that you install a database. If you're using the low-level APIs, you don't need to install a database.