PHP Language and Function Reference, Extensions, Frameworks and Applications. Copies only files for which the Archive attribute is set. Copies only files for which the Archive attribute is set, and resets. So I'm debugging my python program and have encountered a bug that makes the program hang, as if in an infinite loop. Now, I had a problem with an infinite loop. Events are saved in a trace file that can later be analyzed or used to replay a specific series of steps when trying to diagnose a problem. IMPORTANT!! We are announcing the deprecation of SQL Server Profiler for Database Engine Trace Capture and Trace Replay. These features are available in SQL Server 2. The Microsoft. Sql. Server. Management. Trace namespace that contains the Microsoft SQL Server Trace and Replay objects will also be deprecated. Note that SQL Server Profiler for the Analysis Services workloads is NOT being deprecated, and will continue to be supported. Submit your feedback and questions on our Connect page. The following table shows the features we recommend using in SQL Server 2. Feature\Target Workload. Relational Engine. Analysis Services. Trace Capture. Extended Events graphical user interface in SQL Server Management Studio. SQL Server Profiler. Trace Replay. Distributed Replay. SQL Server Profiler. Microsoft SQL Server Profiler is a graphical user interface to SQL Trace for monitoring an instance of the Database Engine or Analysis Services.
You can capture and save data about each event to a file or table to analyze later. For example, you can monitor a production environment to see which stored procedures are affecting performance by executing too slowly. SQL Server Profiler is used for activities such as: Stepping through problem queries to find the cause of the problem. Finding and diagnosing slow- running queries. Capturing the series of Transact- SQL statements that lead to a problem. The saved trace can then be used to replicate the problem on a test server where the problem can be diagnosed. Monitoring the performance of SQL Server to tune workloads. For information about tuning the physical database design for database workloads, see Database Engine Tuning Advisor. Correlating performance counters to diagnose problems. SQL Server Profiler also supports auditing the actions performed on instances of SQL Server. Audits record security- related actions for later review by a security administrator. To use SQL Server Profiler, you need to understand the terms that describe the way the tool functions. NOTE! Understanding SQL Trace really helps when working with SQL Server Profiler. For more information, see SQL Trace. Event. An event is an action generated within an instance of SQL Server Database Engine. Examples of these are: Login connections, failures, and disconnections. Transact- SQL SELECT, INSERT, UPDATE, and DELETE statements. Remote procedure call (RPC) batch status. The start or end of a stored procedure. The start or end of statements within stored procedures. The start or end of an SQL batch. An error written to the SQL Server error log. A lock acquired or released on a database object. An opened cursor. Security permission checks. All of the data generated by an event is displayed in the trace in a single row. This row is intersected by data columns that describe the event in detail. Event. Class. An event class is a type of event that can be traced. The event class contains all of the data that can be reported by an event. Examples of event classes are the following: SQL: Batch. Completed. Audit Login. Audit Logout. Lock: Acquired. Lock: Released. Event. Category. An event category defines the way events are grouped within SQL Server Profiler. For example, all lock events classes are grouped within the Locks event category. However, event categories only exist within SQL Server Profiler. This term does not reflect the way Engine events are grouped. Data. Column. A data column is an attribute of an event classes captured in the trace. Because the event class determines the type of data that can be collected, not all data columns are applicable to all event classes. For example, in a trace that captures the Lock: Acquired event class, the Binary. Data data column contains the value of the locked page ID or row, but the Integer Data data column does not contain any value because it is not applicable to the event class being captured. Template. A template defines the default configuration for a trace. Specifically, it includes the event classes you want to monitor with SQL Server Profiler. For example, you can create a template that specifies the events, data columns, and filters to use. A template is not executed, but rather is saved as a file with a . Once saved, the template controls the trace data that is captured when a trace based on the template is launched. Trace. A trace captures data based on selected event classes, data columns, and filters. For example, you can create a trace to monitor exception errors. To do this, you select the Exception event class and the Error, State, and Severity data columns. Data from these three columns needs to be collected in order for the trace results to provide meaningful data. You can then run a trace, configured in such a manner, and collect data on any Exception events that occur in the server. Trace data can be saved, or used immediately for analysis. Traces can be replayed at a later date, although certain events, such as Exception events, are never replayed. You can also save the trace as a template to build similar traces in the future. SQL Server provides two ways to trace an instance of SQL Server: you can trace with SQL Server Profiler, or you can trace using system stored procedures. Filter. When you create a trace or template, you can define criteria to filter the data collected by the event. To keep traces from becoming too large, you can filter them so that only a subset of the event data is collected. For example, you can limit the Microsoft Windows user names in the trace to specific users, thereby reducing the output data. If a filter is not set, all events of the selected event classes are returned in the trace output. Locks Event Category. Sessions Event Category. Stored Procedures Event Category. TSQL Event Category. Server Performance and Activity Monitoring. A guide to analyzing Python performance « Huy Nguyen. While it. It will take care of starting the timer when your code block begins execution and stopping the timer when your code block ends. Here. The kernprof. These are the areas where optimizations can yield the greatest improvements. How much memory does it use? Now that we have a good grasp on timing our code, let. Fortunately for us, Fabian Pedregosa has implemented a nice memory profiler modeled after Robert Kern. All you have to do is type the following within an IPython session: %load. The major difference here is that you won. Just go ahead and run the profiling directly within your IPython session like so: In . This means that every object contains a counter, which is incremented when a reference to the object is stored somewhere, and decremented when a reference to it is deleted. When the counter reaches zero, the c. Python interpreter knows that the object is no longer in use so it deletes the object and deallocates the occupied memory. A memory leak can often occur in your program if references to objects are held even though the object is no longer in use. The quickest way to find these . This tool allows you to see the number of objects in memory and also locate all the different places in your code that hold references to these objects. To get started, first install objgraph: pip install objgraph. Once you have this tool installed, insert into your code a statement to invoke the debugger: import pdb; pdb. If x is the object causing a memory leak, we can use this method to see why it. Armed with these tools and techniques you should have all the information required to track down most memory leaks as well as identify speed bottlenecks in a Python program. As with many other topics, running a performance analysis means balancing the tradeoffs between effort and precision. When in doubt, implement the simplest solution that will suit your current needs.
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