Open huhengyuan opened 1 year ago
Only level-0 file has overlap key, and other levels do not have overlap key. So the duplicate key will be merged into one key, and the marked as the deleted key will be clear.
LDB file merging is an extremely important part of the database. I want to know whether to control the merging.When I use node to operate leveldb, memtable writes data to the ldb file without reaching the threshold. Is it because I insert a piece of data to reach the memtable threshold?
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Only level-0 file has overlap key, and other levels do not have overlap key. So the duplicate key will be merged into one key, and the marked as the deleted key will be clear.
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As I don't understand c++, I can't analyze the source code when using leveldb, and I have some questions only by referring to the official documentation. When .ldb files are merged, will duplicate keys be removed and those marked as deleted also be deleted?