[Pgcluster-general] technical question

[a.mitani at sra-europe.com]

Hi Andreas,

> Well, how does pgcluster serialize statements? And does it apply
> statements done on two connections concurrently?

In PGCluster, every data writing query is put virtual queue in replication
server.
At the time, the transaction number also added as the statements.
Each statement are taken out from queue, and the query is sent to Cluster
DB using socket connected for every transaction.
The next query is kept waiting until a executed result comes from all
Cluster DBs.
The status of DB also included as the result.

Replication server can receive two or more connections concurrently.
But it can execute one by one.


At.