[Info-vax] Oracle Database vs Oracle/Rdb

[Bob Koehler]

In article <qf35cn$1hq7$1 at gioia.aioe.org>, =?UTF-8?Q?Arne_Vajh=c3=b8j?= <arne at vajhoej.dk> writes:
> On 6/27/2019 3:11 PM, Craig A. Berry wrote:
>> 
>> I think databases often use storage-backed global sections or equivalent
>> for a lot of their I/O so that the OS is just dealing with whole pages
>> that get swapped out to disk using memory management primitives.
> 
> That is probably the most efficient.
> 
> But how do they know if the data are actually written to disk?
> 

   I've used such global sections for inter-process communication many
   times.  But I think a DBMS does want to know data are on the disk.
   I don't know of any way to force that.  As long as the power stays on
   and the OS doesn't crash, it will happen eventually, but I would not
   want to buy a DBMS that relies on those.