Hi,

If I have a data has more than 50,000 records,what is the best DBMS I can use to connect to a c++ program.

Please give me the answer or a helpful site.

Define "Best"...

Cheapest? Fastest? Most reliable? Smallest 'footprint'? Easiest installation? Best support? Stored procedures required? Transactions required?

c++ can interface to almost any relational database.

IMO, you need to first define what your NEEDS are for the database, and only THEN you can make an educated choice as to which database best fits your needs.