That an index will help as scans are generally slower than seeks and can often beĭetermining what the index should look like is even easier. Index name appears on the plan before getting cut off. Table where the clustered index is called PK_Sales_invoices. The select statement got its data from a clustered index scan against the invoices The arrows in the plan will show how the data flowed. SQL Server Management Studio (SSMS) there is a button in the menuīar immediately above the query window or Ctrl+L can be pressed.Įxecution plans are generally read from the bottom up and from right to left. To retrieve an estimated execution plan in Run because it would take too long or because the query modifies data. The estimated plan should only be used in a situation where the query cannot be TheĪctual execution plan is almost always preferred because it is generally more accurate. Requires the query be executed to completion before it can be viewed. The estimated execution plan can be viewed without executing the query and the actual They are the estimated execution plan and the actual execution plan. There are 2 types of execution plans that can be used to help performance tuneĪ query. Generating and reading a SQL Server Execution Plan Note: For this tip, the index that was created at the end of that tip hasīeen removed and the database therefore returned to its original state. This tip will explain how the author knew to take that action. It ends byĪdding an index to this same query and seeing that the query started executing significantlyįaster. Tip walks through several ways to measure query performance. If no values are assigned to variables, the debugger skips the declaration section and pauses at the BEGIN keyword in the execution section.FROM. If you assign variable values in the declaration section, the debugger pauses at the variable declaration. The place where the debugger pauses is detected automatically. You can force the debugger to pause at the beginning of debuggable code. Pause at the beginning of debuggable code ![]() Open settings ( Control+Alt+S) and navigate to Tools | Debugger | Stepping.įrom the Stepping mode list, select the stepping mode that you need. If no valid breakpoints are set, the debugger executes the whole routine. You can read more about Oracle debugging commands in the official Oracle documentation. You cannot pause the target session or manage breakpoints but you might experience a boost in performance in CPU-intensive operations (operations that include a lot of computations and loops). In Native mode, the debugger uses Oracle native debugging commands. If no valid breakpoints are set, the debugger steps through code on a line-by-line basis. In Graceful mode, you can pause the session that you debug (the target session), set and remove breakpoints. When you debug PL/SQL code, you can select between two stepping modes: Graceful and Native. For this purpose, you can use the Run menu commands, or the icons on the stepping toolbar of in the Debug tool window.Įach stepping action advances the execution point to the next execution location, depending on the action you choose. When a breakpoint is reached, the Debug tool window becomes active and enables you to get control over the program's execution. You can configure whether you want Run to Cursor to work on clicking a line number in Settings | Tools | Debugger. Select Run to Cursor from the menu or press Alt+F9.Īlso, you can Run to Cursor by hovering over the line and clicking the Run to Cursor icon. Place the caret at the line where you want the program to pause. Run to cursorĬontinues the execution until the position of the caret is reached. In the example, stepping out skips all iterations of the loop and takes you straight to the main method (the caller). Steps out of the current method and takes you to the caller method.Ĭlick the Step Out button or press Shift+F8. Use this option when you are not sure the method is returning a correct result. Steps into the method to show what happens inside it. The implementation of the methods is skipped, and you move straight to the next line of the caller method. ![]() Steps over the current line of code and takes you to the next line even if the highlighted line has method calls in it. The stepping buttons are located on the Debug window toolbar. Stepping is the process of controlling step-by-step execution of the program.ĭataGrip provides a set of stepping actions, which are used depending on your strategy (for example, whether you need to go directly to the next line or enter the methods invoked on your way there). ![]() Debug functionality is only supported for Oracle databases.
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