Trace flag 4199 was used to collect hotfixes that were intended to become on-by-default in a future release, whereas other trace flags were used for situations in which a fix was not intended to become on-by-default in current form.
#Pc optimizer pro 2005 update#
SQL Server 2008 Service Pack 1 (SP1) Cumulative Update package 7 SQL Server 2005 Service Pack 3 (SP3) Cumulative Update 6 This new practice was initiated across multiple versions starting with the following updates: Later, this practice was changed so that most flags were combined under a single trace flag (4199). At first, each hotfix was delivered under a separate trace flag.
Versions of Microsoft SQL Server later than SQL Server 2000 Service Pack 3 (SP3) delivered most hotfixes to the query optimizer in an off-by-default state in order to prevent existing production customers from seeing expected plan changes that could cause performance regressions. Microsoft SQL Server 2005 Standard Edition Microsoft SQL Server 2005 Enterprise Edition Microsoft SQL Server 2005 Standard X64 Edition Microsoft SQL Server 2005 Enterprise X64 Edition Microsoft SQL Server 2005 Developer Edition Microsoft SQL Server 2005 Workgroup Edition SQL Server 2008 Standard SQL Server 2008 Developer SQL Server 2008 Enterprise SQL Server 2008 Workgroup SQL Server 2008 R2 Datacenter SQL Server 2008 R2 Developer SQL Server 2008 R2 Enterprise SQL Server 2008 R2 Express SQL Server 2008 R2 Standard SQL Server 2008 R2 Workgroup SQL Server 2012 Developer SQL Server 2012 Enterprise SQL Server 2012 Express SQL Server 2012 Standard SQL Server 2014 Developer SQL Server 2014 Enterprise SQL Server 2014 Express SQL Server 2014 Standard SQL Server 2016 Developer SQL Server 2016 Enterprise SQL Server 2016 Standard More.
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