.net core qr code reader

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Determining when to use a hint requires an understanding of the workings of the Query Optimizer, how it might not be making a correct decision, and then an understanding of how the hint might change the plan generation process to address the problem For more than half of the problems that Microsoft typically sees in support calls about query plans, issues with incorrect cardinality estimates are the primary cause of a poor plan choice In other words, a better cardinality estimate would yield a plan choice that is acceptable In other cases, more complex issues around costing, physical data layout, lock escalation, memory contention, or other issues were factors in the performance degradation This section explains how to identify cardinality estimation errors and then use hints to correct poor plan choices, as these are usually something that can be xed without buying new hardware or otherwise altering the host machine.

Defines if and how cookies are used for authentication tickets. Possible values are UseCookies, UseUri, AutoDetect, and UseDeviceProfile. Defines the default URL to redirect after authentication. The default is default.aspx. Specifies a domain name to be set on outgoing authentication cookies. (I ll say more about this later.) Indicates whether users can be authenticated by external applications when authentication is cookieless. The setting is ignored if cookies are enabled. When cookies are enabled, cross-application authentication is always possible. (I ll cover more issues related to this as we go along.)

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Note You can include other application policy OIDs if you want to use the smart card certificate for additional purposes. For example, some organizations add the Secure Email OID (1.3.6.1.5.5.7.3.4) to the custom certificate template to allow the smart card to be used for Secure/Multipurpose Internet Mail Extensions (S/MIME) e-mail.

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The primary tool to identify cardinality estimation errors is the statistics pro le output in SQL Server When enabled, this mode generates the actual cardinalities for each query operator in the plan These can be compared against the Query Optimizer s estimated cardinalities to nd any differences As cardinality estimation is performed from the bottom of the tree upwards (right to left in the showplan s graphical display), errors propagate Usually, the location of the lowest error indicates where to consider hints Other tools exist to track down performance issues with query plans Setting statistics time on is a great way to determine run-time information for a query SQL Pro ler is a great tool for tracking deadlocks and other system-wide issues that can be captured by tracing DBCC MEMORYSTATUS is an excellent tool to nd out what components in the system are causing memory pressure within SQL Server.

Part II:

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This statement calls the showResult method, passing the value in the calculatedValue variable as its argument. The showResult method does not return a value. 6. In the Code and Text Editor window, nd the showResult method you looked at earlier. The only statement of this method is this:

Most of these tools fall outside of the scope of this chapter, though these tools can be helpful for some plan issues It is recommended that cardinality issues be researched rst when there are concerns about plan quality, as this is probably the most common issue..

To keep the code as concise as possible, all the code samples in this chapter assume that the following Imports statements are used at the file or project level:

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You don t need to review the usage data in the query log before you apply usage-based optimization. The data in this table won t be particularly useful to you, but it s good to confirm that you have usage data available before running the Usage-Based Optimization Wizard. In the next procedure, you ll review data in the query log. Browse the query log 1. With the dbo.OlapQueryLog window open in SQL Server Management Studio, click the Execute SQL button in the toolbar to refresh the contents of the window. Your screen looks similar to this:

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