Is the disk equal to log files and other questions?

Question

In the web page http://www.oracle.com/technology/documentation/berkeley-db/je/GettingStartedGuide/introduction.html#dplfeatures, there is a statement, " The checkpointer is responsible for flushing database data to *disk* that was written to cache as the result of a transaction commit ".
I wonder if the disk here means log files under the JE home directory.
From my understanding of these documents and other web resources, the check pointer is to write records in Cache to Log files (disk), and then cleaner is to reorganize and then to remove unused log files. For the records in a Cache, they are brought from disk to Cache by querying the index organized in a B-Tree structure, and the In-Compressor is to delete some empty internal nodes of B-Tree.
I wonder if the above is right to describe relations among these components, check pointer, cleaner, B-Tree and In-Compressor.
Thanks for your help!
Best,
Jiangfan

Answer 1

Jiangfan Shi wrote:
I wonder if the disk here means log files under the JE home directory. Yes.
I wonder if the above is right to describe relations among these components, check pointer, cleaner, B-Tree and In-Compressor. Yes.