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Enabling the Trace Flags is not preferred by all database administrators unless these is a hard need to enable that Trace Flag, as enabling the Trace Flags takes effect on all databases that the user connect to in the Session Trace Flags and all databases for all connecting users in the Global Trace Flags.Ī five recommended Trace Flags can be considered as a part of the SQL Server database administrator’s best practices checklist such as the 4199 Trace Flag that is used to enable the query optimizer hotfixes that are made in the previous releases of the current SQL Server version. Trace Flags are usually used for performance diagnostic and debugging purposes.
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Global Trace Flags should be enabled globally in order to take effect, where some Trace Flags that can be either Global or Session Trace Flags can be enabled in the appropriate scope, and its effect will appear on the defined level. Trace Flags can be defined in two forms Session Trace Flags that are activated and visible at the current connection level only, and Global Trace Flags that are enabled and visible at the SQL Server Instance level and applied to all connecting sessions in that SQL Server. SQL Server Trace Flags are special switches that are used to customize and control specific behaviors of the SQL Server Engine.
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