@Test
    void testDrop() {
        basicLmdbDb.put("key11", "value1", false);
        basicLmdbDb.put("key12", "value1", false);

        assertThat(basicLmdbDb.getEntryCount())
                .isEqualTo(2);

        lmdbEnv.doWithWriteTxn(basicLmdbDb::drop);

        assertThat(basicLmdbDb.getEntryCount())
                .isEqualTo(0);
    }
Comparing overwriting the same key N times vs putting N entries each with a different key
stroom-lmdb/src/test/java/stroom/lmdb/TestBasicLmdbDb.java