Transactions Background Part 1: Low-level timestamps in MongoDB/WiredTiger | MongoDB Blog
Transactions Background Part 2: Logical Sessions in MongoDB | MongoDB Blog
Transactions Background Part 3: Local Snapshot Reads | MongoDB Blog
Transactions Background Part 4: The Global Logical Clock | MongoDB Blog
Transactions Background Part 5: Safe Secondary Reads | MongoDB Blog
Transactions Background Part 6: Retryable Writes | MongoDB Blog