On 28/01/16 16:52, Matthew Holt wrote:
Hi Andy,
Thanks for the reply. Responding in-line below...
On Thu, Jan 28, 2016 at 4:26 AM, Andy Seaborne <[email protected]> wrote:
On 27/01/16 21:45, Matthew Holt wrote:
Hi,
Wanted to check if anyone can confirm if you can successfully change the
TDB File Mode in 2.7.11
2.7.1?
That's correct, I had that listed incorrectly there.
from direct to mapped (assuming a restart takes
place) , or vice-versa, without any issues?
You can do that.
(though upgrading would be a good idea)
We've read that this is supported, and tried this without any issues, but
received some push back as at one time this was an issue.
What was the issue?
At this point not too sure. They encountered this issue around 5 years ago,
Depends on who "they" are.
(If it happens to be IBM ...)
There is one issue that arises ... MS Windows does not allow memory
mapped files to be deleted without exiting the JVM. This is a long
standing Java issue for Sun/Oracle/OpenJDK JVMs.
But direct mode vs mapped mode is reported as not much of a performance
win on Windows anyway.
Andy
and put code in place so that it would only use the File IO mode the
indices were created with. We have only been using Direct, and are now
switching to Mapped IO for systems that support it to take advantage of
performance benefits.
Thanks again for your help,
Matt
Andy
Thanks for any help you can provide,
Matt
