EF5: Avoid deadlocks by connection reusage and allow usage of
CreateDatabaseIfNotExists DB initializer
------------------------------------------------------------------------------------------------------
Key: DNET-524
URL: http://tracker.firebirdsql.org/browse/DNET-524
Project: .NET Data provider
Issue Type: Improvement
Components: Entity Framework support
Affects Versions: 3.2.0.0
Environment: EF 5 on .NET 4.0 and probably 4.5
Reporter: Mark Junker
Assignee: Jiri Cincura
# Avoid deadlocks by connection reusage:
#* Assume that you have both an IDbSet<T1> and IDbSet<T2>
#* Use a TransactionScope()
#* Create the DbContext
#* Create an instance of T1 where you initialize a property T1.X with an
instance of T2 queried from the IDbSet<T2>
#* Add the instance of T1 to the IDbSet<T1>
#* Call SaveChanges()
#* Results in a no wait lock because:
#** Adding the instance of T1 partially loads the IDbSet<T1> and therefore
creates a lock on the table
#** SaveChanges() reopens the existing connection which produces a new
FbConnectionInternal which tries to write something to a locked table
#* Solution: Reuse the internal connection when the FbConnection gets reopened
# Allow usage of CreateDatabaseIfNotExists DB initializer
#* There's a call to context.Database.Exists() while a new
TransactionScope(TransactionScopeOption.Suppress) is active
#* Solution: Allow Enlist without an active transaction
--
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators:
http://tracker.firebirdsql.org/secure/Administrators.jspa
-
For more information on JIRA, see: http://www.atlassian.com/software/jira
------------------------------------------------------------------------------
October Webinars: Code for Performance
Free Intel webinars can help you accelerate application performance.
Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from
the latest Intel processors and coprocessors. See abstracts and register >
http://pubads.g.doubleclick.net/gampad/clk?id=60134071&iu=/4140/ostg.clktrk
_______________________________________________
Firebird-net-provider mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/firebird-net-provider
