Sean, thanks for the response. Answers below.
On 26.02.2017 23:52, 'Leyne, Sean' s...@broadviewsoftware.com [firebird-support] wrote: > > > Andreas, > > > - increase page size to 16kB (gbak -> and restore with new pagesize) > > - increased buffers for firebird to use up to 4GB of ram (256kB) via > gfix > > With Classic server you *need* to reduce the number of cached pages -- > I would recommend a value < 500 pages > > people keep telling me otherwise. Why would I not want firebird to > fill up the cache with lots of pages? Am I misunderstanding firebirds > buffer concept? > > <SL> There are 3 different ‘modes’ that Firebird can run in. > > > > <SL> “Classic” mode is for a large number of connections. For that > mode, the number of pages needs to be reduced. > > > > <SL> For “SuperServer” and “SuperClassic” modes the number of pages > can be maximized. > Alright. I am well aware of that. Each process has its own cache, inheriting the value from the configuration. Cache and buffers are configured accordingly. Thanks for the heads up though. > > > > > > why would it do that? It is entirely under our control when and if the > server restarts or shuts down. I agree with the reasoning, I just > don't see the scenario. Power outage would be the worst case scenario. > And if that actually happened mid-transaction, we have nightly backups > that would be good enough. > > Forced Writes = ON is HIGHLY recommended in all production use-cases. > > I realize that. The worst case scenario is acceptable to the client > though. > > <SL> You must be in a unique environment. > nope. It's just that it is a very unlikely scenario and if this actually happens, losing just a days work is an acceptable risk. I'm not saying that this wouldn't be bad, but all of the work done can be easily reconstructed using e-mails and other incoming data. > > > > <SL> My clients/users would have my skin if I told them they had to > redo all their work at 5pm, the end of a busy work day – just because > I wanted to save “millisecond” for each write operation (given the > presence of a RAID controller with battery cache) by using Forced > Writes = Off and the power went out (someone bumped a power switch). > I can see that. But in this particular scenario, we're talking 1-2 seconds per mouse-click. Depending on the operation. if you slow down everything (!) like that, it is going to be a lot more productive for them to get some work done every day than losing a days work around every two years :) but generally you are right. This is the first time we encountered a firebird database, so this is new ground to all of us. Lock tables seem to be empty though. That is what google told me about the error. I really am lost. fb_config tells me that the config directory is the one I picked. However, firebird still uses /tmp/firebird as a temp directory, regardless of what I set as envvar or in the config. So I am obviously concerned that none of the settings I make do have any effect. How can I check out if any of that had any effect? Andreas
