upc internet cena Event Sessions in Visual Basic .NET

Creation UPC-A Supplement 2 in Visual Basic .NET Event Sessions

Event Sessions
UPC A Drawer In VB.NET
Using Barcode generator for .NET framework Control to generate, create UPC A image in .NET applications.
www.OnBarcode.com
Reading GS1 - 12 In Visual Basic .NET
Using Barcode decoder for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
We have now gone through each of the elements that make up the core XE infrastructure. Bringing each of these together into a cohesive unit at run time are sessions. These are the XE equivalent of a trace in SQL Trace parlance. A session describes the events that the user is interested in collecting, predicates against which the events should be ltered, actions that should re in conjunction with the events, and nally targets that should be used for data collection at the end of the cycle. Any number of sessions can be created by users with adequate server-level permission, and sessions are for the most part independent of one another, just as with SQL Trace. The main thread that links any number of sessions is a central bitmap that indicates whether a given event is enabled or disabled. An event can be enabled simultaneously in any number of sessions, but the global bitmap is used to avoid having to check each of those sessions at run time. Beyond this level, sessions are completely separate from one another, and each uses its own memory and has its own set of de ned objects.
Encoding Barcode In Visual Basic .NET
Using Barcode printer for .NET framework Control to generate, create bar code image in VS .NET applications.
www.OnBarcode.com
Decode Bar Code In VB.NET
Using Barcode decoder for VS .NET Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
Session-Scoped Catalog Metadata
Drawing UPC Symbol In C#
Using Barcode generator for .NET Control to generate, create Universal Product Code version A image in .NET applications.
www.OnBarcode.com
UPC-A Supplement 5 Creation In .NET Framework
Using Barcode generation for ASP.NET Control to generate, create GS1 - 12 image in ASP.NET applications.
www.OnBarcode.com
Along with de ning a set of events, predicates, actions, and targets, various XE con guration options are scoped at the session level. As with the objects that de ne the basis for XE, a number of views have been added to the metadata repository of SQL Server to support metadata queries about sessions. The sys.server_event_sessions catalog view is the central metadata store for information about XE sessions. The view exposes one row per session de ned on the SQL Server instance. Like traces in SQL Trace, XE sessions can be started and stopped at will. But unlike traces, XE sessions are persistent with regard to service restarts, and so querying the view before and after a restart show the same results unless a session has been explicitly dropped. A session can be con gured to start itself automatically when the SQL Server instance starts; this setting can be seen via the startup_state column of the view. Along with the central sys.server_event_sessions views are a number of other views describing details of how the session was con gured. The sys.server_event_session_events view exposes one row per event bound to each session, and includes a predicate column that contains the de nition of the predicate used to lter the event, if one has been set. There are similar views
Print GS1 - 12 In .NET
Using Barcode creator for .NET Control to generate, create GS1 - 12 image in VS .NET applications.
www.OnBarcode.com
Universal Product Code Version A Printer In VB.NET
Using Barcode generation for .NET Control to generate, create UPC-A image in VS .NET applications.
www.OnBarcode.com
2
Data Matrix Creator In VB.NET
Using Barcode creation for Visual Studio .NET Control to generate, create Data Matrix ECC200 image in .NET framework applications.
www.OnBarcode.com
Generating Quick Response Code In Visual Basic .NET
Using Barcode generator for Visual Studio .NET Control to generate, create QR Code JIS X 0510 image in VS .NET applications.
www.OnBarcode.com
Change Tracking, Tracing, and Extended Events
Printing Code 39 Extended In Visual Basic .NET
Using Barcode drawer for VS .NET Control to generate, create Code 39 Full ASCII image in Visual Studio .NET applications.
www.OnBarcode.com
Paint USD8 In Visual Basic .NET
Using Barcode drawer for .NET Control to generate, create Code 11 image in .NET framework applications.
www.OnBarcode.com
for actions and targets, namely: sys.server_event_session_actions and sys.server_event_session_ targets. A nal view, sys.server_event_session_ elds, contains information about settings that can be customized for a given event or target. For example, the ring buffer target s memory consumption can be set to a speci c amount by a user; if the target is used, the memory setting appears in this view.
PDF 417 Printer In Java
Using Barcode printer for Java Control to generate, create PDF-417 2d barcode image in Java applications.
www.OnBarcode.com
Create Data Matrix In None
Using Barcode creator for Software Control to generate, create Data Matrix ECC200 image in Software applications.
www.OnBarcode.com
Session-Scoped Con guration Options
Barcode Generation In Objective-C
Using Barcode generation for iPhone Control to generate, create barcode image in iPhone applications.
www.OnBarcode.com
Drawing PDF 417 In Java
Using Barcode generator for Java Control to generate, create PDF-417 2d barcode image in Java applications.
www.OnBarcode.com
As mentioned in the section entitled Targets, earlier in this chapter, a number of settings are set globally for a session and, in turn, in uence the run-time behavior of the objects that make up the session. The rst set of session-scoped options includes those that we have already discussed: options that determine how asynchronous target buffers are con gured, both from a memory and latency standpoint. These settings in uence a process called the dispatcher, which is responsible for periodically collecting data from the buffers and sending it to each of the asynchronous targets bound to the session. The frequency with which the dispatcher is activated depends on how the memory and latency settings are con gured. If a latency value of in nite is speci ed, the dispatcher does not collect data except when the buffers are full. Otherwise, the dispatcher collects data at the interval determined by the setting as often as once a second. The sys.dm_xe_sessions DMV can be used to monitor whether there are any problems dispatching asynchronous buffers. This DMV exposes one row per XE session that has been started and exposes a number of columns that can give a user insight into how buffers are being handled. The most important columns are the following:
Reading Barcode In .NET Framework
Using Barcode Control SDK for ASP.NET Control to generate, create, read, scan barcode image in ASP.NET applications.
www.OnBarcode.com
UPCA Generation In Java
Using Barcode encoder for Android Control to generate, create UPC Code image in Android applications.
www.OnBarcode.com
regular_buffer_size and total_regular_buffers. These columns expose the number of buffers created based on the maximum memory and memory partitioning settings as well as the size of each buffer. Knowing these numbers and estimating the approximate size for each event tells you how many events you might lose in case of a full buffer situation, should you make use of the allow multiple event loss option. dropped_event_count and dropped_buffer_count. These columns expose the number of events and/or buffers that have been dropped due to there not being enough free buffer space to accommodate incoming event data. blocked_event_ re_time. This column exposes the amount of time that blocking occurred, if the no event loss option was used.
Creating Code 3/9 In Java
Using Barcode generation for Java Control to generate, create Code 3 of 9 image in Java applications.
www.OnBarcode.com
DataMatrix Printer In C#
Using Barcode generator for .NET framework Control to generate, create ECC200 image in .NET framework applications.
www.OnBarcode.com
Another session-scoped option that can be enabled is called causality tracking. This option enables users to use a SQL Server engine feature to help correlate events either when there are parent-child relationships between tasks on the same thread or when one thread causes activity to occur on another thread. In the engine code, these relationships are tracked by each task de ning a GUID, known as an activity ID. When a child task is called, the ID is passed along and continues down the stack as subsequent tasks are called. If activity needs to pass to another thread, the ID is passed in a structure called a transfer block, and the same logic continues.
Copyright © OnBarcode.com . All rights reserved.