I’m trying to build a DFD diagram but I was confused about caching system which is used to make the data run faster.
Is the diagram below in correct order or should I make another link from caching system to the database?
Data Flow Diagram (DFD) Question about how to link caching system with the main API
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The diagram uses the Yourdon/DeMarco notation. There is only one active process
The Core Application API. TheCaching Systemand theMySQL Databaseare both data stores. According to Yourdon/DeMarco, a data store is:All a data store can do, is to store and retrieve data at the request of a process. But it is not itself process data and interact directly with other data stores. So there shall not be a direct link between the cache and the database.
If your
Core application APImanages the cache, your diagram is fine. I'd nevertheless renameCaching system(which suggest an active process) toCache(which better reflects a repository).If not, and if the cache system manages itself in direct interaction with the database, you would need to transform it into a separate process
Cache systemwhich you'd insert in the flows between your core application and the database. This new process should then have flows with the database, with the application process and a newCachedata store.Btw, I'd recommend to remove
APIfrom the name of your process: the API is just the interface to the application and not the application itself.