[Lazarus] What is a TSQLTransaction and why do I need one?
Joost van der Sluis
joost at cnoc.nl
Wed Dec 1 14:23:37 CET 2010
On Wed, 2010-12-01 at 14:17 +0100, zeljko wrote:
> On Wednesday 01 December 2010 13:48, Joost van der Sluis wrote:
> > On Tue, 2010-11-30 at 13:14 +0100, zeljko wrote:
> > > > I think we should not change a thing, until the problem is clear. Maybe
> > > > we can come up with some 'general' transaction-isolation levels. The
> > > > reason they are not implemented in a general way is that each DB has
> > > > it's own locking-style.
> > >
> > > Here is nice explanation of isolation levels, "general"
> > > transaction-isolation levels should be implemented definitelly.
> > > http://en.wikipedia.org/wiki/Isolation_%28database_systems%29
> > Well, these are tne ansi/sql transacion isolation levels. do you know a
> > database which actually uses/supports these? (Except from Oracle)
> Yes, PostgreSQL supports all of them.
With the same names? I know from some other db-servers, that they use
different names. Because by default they use some slightly different
isolation levels, but offer the ansi/sql levels as 'compatibility'
option. Sometimes you have to set some flags to get the proper behavior.
(Most DB-vendors find their own isolation-levels better then the
default, 'old', ansi-c ones)
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