At 3 million plus games, I think "big DB" is a fair description. Or perhaps it could be 3 million very carefully selected games! 
Mega Database is larger still at 4 million plus games, so you should probably use that as your reference database.
You can usually figure out whether a survey is in English by opening it, and looking at it. 
If it's important to you, you could create a seperate folder for English surveys, and when you find one, move it there.
"Big DB" is a product that DB offers - I was wondering if this was identical.
There are 4814 surveys, I didn't want to open each one. But this brings an interesting question, which is applicable for my other DBs also.
For example, I have a DB called MyChessDotComGames, and it has all of the games I've played here. In theory I would like to analyze all of them, but there are 800+ games, so that is too much. How can I mark a game as "interesting", or "starred", or something like that.
I don't want to copy the games of interest into a different DB, because I want a single DB of record for my games.
The only thing I have come up with so far is to use the 'Annotator' field for this purpose. One can define some sort of key system. 'P1' means very important to analyze, 'P2' is the next tier.
A follow-up on the Opening Encyclopedia: How do I find a survey for a specific position? Is it as simple as setting OE to be my reference DB, then opening a board and making the position? (While having the search pane open).
I think that Chessbase's Big Database has a similar number of games to Mega Database just no annotations. The Opening Encyclopaedias are a seperate product, but obviously all of these draw on a common stock of games.
I suspect that most of the surveys are in English, although you do find German scattered here and there throughout Chessbase products.
To mark a specific game, open it up, and then type Shift + " (the quotation mark/ apostrophe key). A dialog box will appear, and you can put a tick in the box next to one of the colour coded medals, eg. best game, decided tournament, model game, etc. Click OK, and then type Ctrl + R to replace the game in the database. You may have to do this twice if the Medal doesn't take or if you are trying to delete an old medal.
In any game list window, you can add a Medals field by right clicking on the heading across the top, and this will let you see the colour codes in the game list window. Alternatively, you can scroll through the heading arrangements by typing Alt + Q until you reach one that shows the Medals field.
The Surveys are each in a seperate database from the main large database. The Surveys are named according to ECO code, eg. the 4...Nd7 variation of the Caro-Kann is B17. Hit Ctrl-N to open a new game window, and then play out the moves of the position you want to look at, or alternatively, just open one of your games and navigate to the position. Open the database with the appropriate ECO code in the main database window. Right click on the database icon, and select Search... At the top, click on the "Position" tab, and then click on the button marked "Copy board." You should be able to see the position now on the board. Now click OK, and it will search, and then show a list of games that have that position.
Hey thanks.
One other question: How do I create an opening tree?
File - New - Database, and then at the bottom of the dialog box where it says "Save as Type," choose "Books .ctg" and give the file a name. Then, you can drag and drop games onto the ctg icon, and it will open a dialog asking how many moves you want it to include past ECO, etc.
I find opening keys a bit more useful than opening trees because it gives you access to the complete games, you can customize which moves to skip, and you can include other information (such as the best result when backsolved) in the text field of the key. You can also generate statistics for any branch in the key, for example, on how well a certain player did with black in the given position.
To create a key, click on the Openings tab at the top of an open database, and then click on Install Empty Key. In a game window, play out a first move, eg. 1.e4 and then switch back to the database, right click in the main Openings window, and select Edit - Insert New Key. You can nest subvariations within each key, so that you can navigate quickly to any set of games you are interested in.
I bought ChessBase 10, Mega DB, Deep Rybka 4, and Opening Encyclopedia.
I can analyze my games using a combination of me, the Rybka 4 pane, and a pane looking at Mega DB (as a reference DB).
How do I use the Opening Encyclopedia? Some specific questions:
Grrrrrr