The use of C++ Database libraries like mongo, oceanbase, soci is very common in the world. The reason behind its popularity is the high performance and reliability it provides. It also has a good support for large data sets. The most popular database library in C++ is mongoDB which is the open-source database that has a lot of features like high performance and low latency which makes it ideal for web applications. It can be used to store information from different platforms like mobile devices, desktops and servers as well. MongoDB is also an object oriented language so you can use its classes for your data structures.
Another popular database library in C++ is oceanbase which provides a powerful framework for building scalable web applications using PHP. Oceanbase has built-in support for various databases such as MySQL, PostgreSQL, Oracle, SQL Server etc. It supports multiple languages including PHP and Java so you don't have to worry about writing any code in these languages to access your database server. The other advantage of using oceanbase is its ability to handle multiple users simultaneously without any performance issues or downtime. Some of the most widely used open source C++ Database libraries among developers include