Isolation level support in distributed database system

A computer-implemented method, comprising:

• transmitting a first transaction identifier and a first commit identifier to a first data storage system, the first commit identifier identifying a first data snapshot of the first data storage system;
• transmitting a first query to the first data storage system;
• transmitting a first prepare instruction and the first transaction identifier to the first data storage system;
• determining that a first ready response has been received from the first data storage system in response to the first prepare instruction;
• in response to the determination, transmitting a first commit instruction and the first transaction identifier to the first data storage system;
• and
• receiving a second commit identifier from the first data storage system, the second commit identifier identifying a second data snapshot of the first data storage system.

A non-transitory computer-readable medium storing program code, the program code executable to:

• transmit a first transaction identifier and a first commit identifier to a first data storage system, the first commit identifier identifying a first data snapshot of the first data storage system;
• transmit a first query to the first data storage system;
• transmit a first prepare instruction and the first transaction identifier to the first data storage system;
• determine that a first ready response has been received from the first data storage system in response to the first prepare instruction;
• in response to the determination, transmit a first commit instruction and the first transaction identifier to the first data storage system;
• and
• receive a second commit identifier from the first data storage system, the second commit identifier identifying a second data snapshot of the first data storage system.