#includeIn this example, we first create a new database environment using the db_env_create function. Then we call the DB_ENV open method on the newly created database environment object, passing in the name of the environment ("myEnv"), as well as some flags to specify the behavior of the environment (DB_CREATE, DB_INIT_MPOOL, and DB_INIT_LOCK). Once the environment is open, we can perform database operations using whatever DB APIs we need to use. Finally, we call the DB_ENV close method to cleanly shut down the database environment. The Berkeley DB library is typically packaged as a set of C/C++ libraries and headers that need to be linked into a project. The specific package/library that contains the DB_ENV open function will depend on the OS and package manager being used. For example, on Debian-based Linux systems, the package might be called "libdb-dev".int main() { DB_ENV *db_env; int ret; ret = db_env_create(&db_env, 0); if (ret != 0) { // handle error } ret = db_env->open(db_env, "myEnv", DB_CREATE | DB_INIT_MPOOL | DB_INIT_LOCK, 0); if (ret != 0) { // handle error } // do database operations // ... ret = db_env->close(db_env, 0); if (ret != 0) { // handle error } return 0; }