Concurrent transaction processing in a database system

A method comprising:

• inserting, by a first transaction, a new version of an object, the inserting corresponding to a first statement from the first transaction, the first statement including information indicating a first key, a first transaction identifier, a first statement number, and a first restart count;
• performing, by a second transaction, a range read, the range read including information indicating the first key;
• receiving, after performing the range read, a set of conflicting transactions;
• and
• determining that a conflict occurred between the first transaction and a third transaction from the set of conflicting transactions.

A non-transitory computer-storage medium comprising instructions that, when executed by one or more processors of a machine, configure the machine to perform operations comprising:

• inserting, by a first transaction, a new version of an object, the inserting corresponding to a first statement from the first transaction, the first statement including information indicating a first key, a first transaction identifier, a first statement number, and a first restart count;
• performing, by a second transaction, a range read, the range read including information indicating the first key;
• receiving, after performing the range read, a set of conflicting transactions;
• and
• determining that a conflict occurred between the first transaction and a third transaction from the set of conflicting transactions.