Record locking

[Bill Akers]

John Esak wrote:
>>I saw a similar situation years ago running windows ?? over a lantastic
>>network. I believe that I set PFSYNC to ON or ALL in filepro and did
>>something to the network also to cause it to write the cache after each
>>transaction was saved at the workstation. I could never go back and find
>>what it was because it was so long ago but it definitely had to do with
>>network and/or windows holding transactions in the cache until forced to
>>write them to disk.
> 
> 
>>--

>>_______________________________________________
> 
> I understand what you are saying... and it probably _does_ have to do with
> Windows somewhere somehow... but filePro is working with in-memory values...
> not those written to disk... so if you say:
> 
>       num=ctl(1) and then refer to it later... filePro is using its own copy
> in memory of that value... it doesn't matter _when_ it gets written to
> disk... it is going to be written in the proper sequential order of
> things... or at least that is the way it is supposed to work... :-)
> 
> John
> 

As I insinuated earlier, there were three potential users working 
simultaneously and all of them could have had the same number since the 
network/windows was holding the changes in cache rather than immediately 
writing back to the files on the station that was acting as server as 
soon as one station had asked for a new number.  There was enough lag 
that even after a ticket was written and printed and stored, you could 
not always find it in the system from another workstation until the 
filepro session was terminated, in which case the information was always 
updated and the new information was stored.  However, usually if a 
workstation had processed two or more transactions, then the information 
would be updated and new information stored, which says to me that a 
write buffer was in use by one or the other of the 
systems(windows/network) and required forcible flushing to make sure 
that each transaction was immediately stored. That was what PFSYNC and 
whatever else we did at the time accomplished.


-- 
William Akers
MGM Industries, Inc.
Hendersonville TN USA