How to config a shared cache for multiple environments with C API

How to config a shared cache for multiple environments with C API?  Just like Java edition. Chapter 2. Database Environments
I want to open large number of databases, at least 10,000. But as the counts of databases opened increase, the db->open operation become very slow. It almost cost 2 hours to 10,000 databases.
So I try to distribute these databases to multiple environments ( for example, 5 envs ). And in order to improve the efficient of memory use, I want to share cache between envs.

Hi,
It is not clear what you meaning about multiple environments. Do you mean these environments are in different directories or  in the same directory ? If you mean environments in different dirs share the same cache, it is interesting why you need that.
If you do not use DB_PRIVATE to open the environment, the created cache will be on disk, in the environment directory, so it can be shared by multiple processes and multiple threads. Currently, the cache file is in the environment directory, and we do not support specifying a separate directory for cache only.
Regards,
Oracle Berkeley DB.

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