LevelDB: Lifetime and responsibility of comparators, block_cache and filter_policy?

Question

Do I need to delete my comparators, block_cache and filter_policy after closing my database? Do they need to exist during the lifetime of the database?

I cannot find this info in any of the documentation.

From looking at the source code, I'm guessing that I need to delete them after closing the database but they need to persist during the lifetime while it's open.

Thanks

Answer 1

options.block_cache and options.filter_policy must be deleted after closing the database handles.

Answer 2

You're right about comparators but I'm not sure about the other two.