Master transaction sync policy:
SYNC (the transaction will be written and synchronized to the disk; highest durability)
WRITE_NO_SYNC (the transaction will be written only; the synchronization will be performed later)
NO_SYNC (write later; the transaction will be written and synchronized later; lowest durability)
Replica transaction sync policy:
SYNC (the transaction will be written and synchronized to the disk; highest durability)
WRITE_NO_SYNC (the transaction will be written only; the synchronization will be performed later)
NO_SYNC (write later; the transaction will be written and synchronized later; lowest durability)