Re: Side effect of synchronous_commit = off

[Arthur Turrini <atgnbk@xxxxxxxxx>]

Being asynchronous, means that write-to-disk will be queued in kernel for later execution, ie, postgresql won't wait for its write confirmation, but they will occurr in a serial manner.

On Thu, Mar 25, 2010 at 4:49 AM, Yan Cheng CHEOK <yccheok@xxxxxxxxx> wrote:

I was wondering whether setting synchronous_commit = off will have the following side effect.

(1) Process A issues UPDATE command on row x, from false to true.
(2) After that, Process B READ from row x.

Is it possible that when Process B start to read row x, the "true" value is not being "flushed" to the table. Hence, process B will read the row x as false?

If this situation will happen, is it possible that Process B may issues a command, use to "flush all" pending data to be written to disk?

Thanks and Regards
Yan Cheng CHEOK

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