Re: [Firebird-net-provider] Changing transaction isolation levels [huge break]
I agree totally with 337.
ReadCommited should be
read committed record version no wait
I had troubles with nhibernate because of this, and used readUncommited as
a workaround.
On Mon, Sep 24, 2012 at 6:45 PM, Alexander Muylaert-Gelein
amuylaert_gel...@hotmail.com wrote:
Default should be the current read_uncommitted.
I really spend a lot of time on asking people to check their
connectionstrings.
-Original Message-
From: Jiri Cincura [mailto:disk...@cincura.net]
Sent: maandag 24 september 2012 17:33
To: For users and developers of the Firebird .NET providers
Subject: Re: [Firebird-net-provider] Changing transaction isolation levels
[huge break]
So no other opinions?
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Re: [Firebird-net-provider] Changing transaction isolation levels [huge break]
So no other opinions?
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Re: [Firebird-net-provider] Changing transaction isolation levels [huge break]
On 16-9-2012 7:53, Jiri Cincura wrote: On Sat, Sep 15, 2012 at 5:24 PM, Michael Ludwig mil...@gmx.de wrote: so why try faking it? Because sometimes you're using some tools, designers, wizards. And who knows why they will ask for ReadUncommitted. And if you can't change it, you'll be stuck. What does the specification say (if there is such a thing)? For example the JDBC specification says the following: It is possible for a given JDBC driver to not support all four transaction isolation levels (not counting TRANSACTION_NONE). If a driver does not support the isolation level specified in an invocation of setTransactionIsolation, it is allowed to substitute a higher, more restrictive transaction isolation level. If a driver is unable to substitute a higher transaction level, it throws an SQLException. In other words: upgrading to a higher isolation level is allowed if you don't support the lower level, downgrading is an error (because users expecting a high level of isolation won't get the guarantees they want, while users expecting a lower level of isolation - usually - don't mind if they get a higher level. So to me treating ReadUncommitted as if it is ReadCommitted would be ok. Mark -- Mark Rotteveel -- Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://ad.doubleclick.net/clk;258768047;13503038;j? http://info.appdynamics.com/FreeJavaPerformanceDownload.html ___ Firebird-net-provider mailing list Firebird-net-provider@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/firebird-net-provider
[Firebird-net-provider] Changing transaction isolation levels [huge break]
Hi *,
recently I went across bugs and found DNET-337. Read it, think about it.
What my idea is, is to change ReadCommitted and ReadUncommitted to
have same [1] TPB and use rec_version [2].
[1] Because there's no uncommitted mode in Firebird and I think it's
better than throw an exception.
[2] Because of reasons mentioned in ticket.
What do you think? This will, for sure, be version 3.0 because it's
huge breaking change. As much as I don't like breaking changes, this
looks like one worth it. Of course, there will be huge screaming read
exclamation point everywhere around this version.
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Re: [Firebird-net-provider] Changing transaction isolation levels [huge break]
Jiri Cincura schrieb am 15.09.2012 um 13:40 (+0200): … I went across bugs and found DNET-337. Read it, think about it. http://tracker.firebirdsql.org/browse/DNET-337 What my idea is, is to change ReadCommitted and ReadUncommitted to have same [1] TPB and use rec_version [2]. [1] Because there's no uncommitted mode in Firebird and I think it's better than throw an exception. [2] Because of reasons mentioned in ticket. What do you think? A. ReadUncommitted Firebird doesn't do ReadUncommitted, so raising an ArgumentException when ReadUncommitted is requested would seem to make sense to me. Falling back to ReadCommitted, on the other hand, would not be what was requested. Firebird people clearly agree that Firebird doesn't do ReadUncommitted, so why try faking it? B. ReadCommitted For ReadCommitted, I found this discussion from 12/2005, which the ticket in question reads like an echo of: firebird-devel - NO_REC_VERSION http://firebird.1100200.n4.nabble.com/NO-REC-VERSION-td1109867.html Looks like they didn't change the default of isc_tpb_no_rec_version in the C API (see ApiGuide.pdf p.66) in order not to break existing code. This will, for sure, be version 3.0 because it's huge breaking change. As much as I don't like breaking changes, this looks like one worth it. Of course, there will be huge screaming read exclamation point everywhere around this version. An argument in favour of changing ReadCommitted to default to isc_tpb_rec_version would be that a couple knowledgeable people say it has usability advantages and makes more sense that way. An argument against it might be that it deviates from the C API. As for me, first time I'm even hearing about the issue, so I don't have an opinion on what's wrong or right for ReadCommitted in .NET. Here's another related and probably relevant discussion (too tired to read it now): firebird-devel - ReadCommitted isolation mode in Firebird's drivers http://firebird.1100200.n4.nabble.com/ReadCommitted-isolation-mode-in-Firebird-s-drivers-td2311647.html Michael -- How fast is your code? 3 out of 4 devs don\\\'t know how their code performs in production. Find out how slow your code is with AppDynamics Lite. http://ad.doubleclick.net/clk;262219672;13503038;z? http://info.appdynamics.com/FreeJavaPerformanceDownload.html ___ Firebird-net-provider mailing list Firebird-net-provider@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/firebird-net-provider
Re: [Firebird-net-provider] Changing transaction isolation levels [huge break]
On Sat, Sep 15, 2012 at 5:24 PM, Michael Ludwig mil...@gmx.de wrote:
so why try faking it?
Because sometimes you're using some tools, designers, wizards. And who
knows why they will ask for ReadUncommitted. And if you can't change
it, you'll be stuck.
--
Jiri {x2} Cincura (x2develop.com founder)
http://blog.cincura.net/ | http://www.ID3renamer.com
--
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Download AppDynamics Lite for free today:
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