Jeff Davis wrote: > How does WAL shipping help synchronous replication?
The WAL is written _before_ commit, logging all the changes the transaction wants to write to the disk. This makes it look very similar to what is needed for synchronous replication.
Instead of waiting for confirmation from the disk, that your WAL has been written, you would have to wait from the network to confirm that the changes have been delivered via the network.
Regards Markus ---------------------------(end of broadcast)--------------------------- TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match