CONCURRENT TRANSACTION PROCESSING IN A DATABASE SYSTEM

The subject technology performs a read operation from a first transaction on a table in a database. The subject technology determines a first commit version identifier corresponding to first data resulting from the read operation. The subject technology proceeds to perform a particular write operation from the first transaction. The subject technology determines that the first commit version identifier fails to match a second commit version identifier corresponding to a second transaction. The subject technology aborts the particular write operation from the first transaction. The subject technology performs a particular read operation from the first transaction. The subject technology determines a particular commit version identifier corresponding to particular data resulting from the particular read operation. The subject technology retries to perform the particular write operation. The subject technology performs the particular write operation in response to the particular commit version identifier matching the second commit version identifier.