What would be a good database to use for developing a site with twitter streaming API?
It depends on what you wan’t to store away, how much you store away, if you wan’t to have it locally or on a dedicated DB server or even clustered. Also licensing of the database system can have a huge impact on this decission or the customers requirement.
But to answer the question as generic as you have asked it: any.
Thanks @NobbZ…I want to save the tweets as they are coming in…it’s not for a company…do you think PostgreSQL would be a good choice?
PostgreSQL is often a good choice. But unless you really expect loads of data even a plain file would do.
Since you didn’t told that you wan’t to read the data from the DB, I’d even suggest /dev/null, its probably the fastest for Write-Only data 
If though, it is true that you do not expect to read the data back in, I am near to suggest a simple logging DB like LogStash.
If you wan’t to read data back in, I’d stick with PostgreSQL until you hit issues that are provably related to it.
NB: As you can see, you might think your requirements are already clear as you have written them, but if one takes them for granted, it will probably mess up everything So before telling your requirements, think of them. Perhaps speak them out loud to a Rubber Duck (I have a easter chocolate rabbit on my desk for this), maybe you will discover the gaps in qour requirements then as well
@NobbZ…I will be saving a lot of data…I am thinking of building something along the lines of this http://birdwatch.matthiasnehlsen.com to give you a better idea.
When it comes to databases, I would ask myself “Why not Postgres?”.
PG is an awesome database and extremely flexible.
So you already know it. You are developing on your own. So keeping the number of things to learn at a minimum seems logical. For a draft I had even considered SQLite if it were the only RDBMS I know.
You can always swap technologies later on. Especially if they are abstracted away very well.
I have done this a couple of times in day job. Wasn’t that easy as it were here, but you get the point I think.
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