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Thread: ForcedWrites


This question is answered. Helpful answers available: 2. Correct answers available: 1.


Permlink Replies: 3 - Last Post: Oct 14, 2016 9:31 AM Last Post By: Jeff Overcash (... Threads: [ Previous | Next ]
John MacDonald

Posts: 179
Registered: 3/22/98
ForcedWrites  
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  Posted: Oct 13, 2016 2:48 PM
I'm in the process of moving to FireDac and Interbase.

The DataPump tells me that my new database is in ForcedWrites mode.

Is this something I can change in the ibConsole?

John

BTW: Interbase XE3 and I am copying dbase files from the BDE.

--
JMAC out
Jeff Overcash (...

Posts: 1,529
Registered: 9/23/99
Re: ForcedWrites  
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  Posted: Oct 13, 2016 5:26 PM   in response to: John MacDonald in response to: John MacDonald
John MacDonald wrote:
I'm in the process of moving to FireDac and Interbase.

The DataPump tells me that my new database is in ForcedWrites mode.

Is this something I can change in the ibConsole?

John

BTW: Interbase XE3 and I am copying dbase files from the BDE.

--
JMAC out

Yes, Bring up the database properties in IBConsole and change the write mode
from Sync to ASync. Production databases should be in Sync mode though to stop
potential corruptions on power failure.

--
Jeff Overcash (TeamB)
(Please do not email me directly unless asked. Thank You)
Learning is finding out what you already know. Doing is demonstrating that you
know it. Teaching is reminding others that they know it as well as you. We are
all leaners, doers, teachers. (R Bach)
John MacDonald

Posts: 179
Registered: 3/22/98
Re: ForcedWrites  
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  Posted: Oct 13, 2016 9:42 PM   in response to: John MacDonald in response to: John MacDonald
Thanks that helped to kick it up a notch.
Jeff Overcash (...

Posts: 1,529
Registered: 9/23/99
Re: ForcedWrites  
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  Posted: Oct 14, 2016 9:31 AM   in response to: John MacDonald in response to: John MacDonald
John MacDonald wrote:
Thanks that helped to kick it up a notch.

ASync is much faster because it just does the write to the buffer and lets the
OS decide when to do the physical write to disk. In very stable situations (on
battery backup etc) this is safe in a production environment, but if for some
reason there is a crash (server due to BSOD, power failure etc) you can have a
corrupted DB due to inconstancy in the data.

Sync is slower because when you do a commit the write is done right then and the
server waits for the disk write to complete before writing the completion of hte
transaction. While slower this means you can literally pull the plug on a
running server and not corrupt your DB. This is why Sync is the default mode
for databases.

In some cases Direct IO is a little faster than Sync, but current versions of
InterBase have fixed the reason why direct IO was originally introduced (I think
one of the XE3 updates did that).

--
Jeff Overcash (TeamB)
(Please do not email me directly unless asked. Thank You)
Learning is finding out what you already know. Doing is demonstrating that you
know it. Teaching is reminding others that they know it as well as you. We are
all leaners, doers, teachers. (R Bach)
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