The SQL Trace Tool in Software

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The SQL Trace Tool
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The SQL trace is a tool that allows you to display and analyze the contents of the database calls that are made by the reports and transactions written in ABAP. Using this facility, you can: Display for every ABAP OPEN SQL instruction which SQL embedded (DECLARE, PREPARE, OPEN, FETCH) statements have been executed Analyze the consequences for the system performance for example, which values the system uses for specific database accesses and changes Identify unnecessary accesses to the database and where the COMMITs are performed
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Creating a SQL Trace
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To create a SQL trace, perform the following steps: From any R/3 screen, select the menu option System Utilities SQL trace. Alternatively, enter transaction ST05 in the command field. Figure 7 32 shows this initial screen.
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Analyzing a SQL Trace
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Figure 7 32: Main screen for the SQL trace tool. Set the SQL Trace check box, enter the file path and filename in which to keep the trace log, and click the Trace on button. Enter the username for the user under whose privileges the program to be traced is going to be executed. The field status of trace will then be turned on. Execute the program or transaction you want to trace. Return to the SQL trace initial screen (ST05) and press the Trace off button.
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To display a previously created SQL trace, perform the following steps: From any screen, call the System Utilities SQL trace menu and click the List trace push button. The system will request: SQL trace filename. Where the trace was recorded Trace mode. Trace to show (SQL, Enqueue, or RFC trace) Username. Username under which the trace was created Period. Period of time to analyze Duration. Operation time to consider during analysis Operation. SQL operation to analyze Then click on the OK button. Figure 7 33 shows the resulting screen with the database request lists.
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Analyzing a SQL Trace
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Figure 7 33: Listing the database request for SQL traces. The system will present a listing with all the database calls, indicating when the calls were made, the program, the table accessed, as well as the embedded SQL call operations. To know which ABAP statement was the source for the SQL operation, position the cursor in the program field and click on the ABAP Display button. To display the dictionary definition information about the accessed table, position the cursor over the Table field and click on the DDIC info button. The system also includes a utility for providing detailed information about the SQL operation strategy followed by the underlying database system. To display that information, position the cursor over the line to analyze and click the Explain SQL button. Figure 7 34 shows an example.
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Figure 7 34: Analyzing SQL statements. The system displays the execution plan for SQL statements. Here, you can display the actual SQL statements and discover whether the access is being performed using indexes or is just sequential. This can be quite useful for long running transactions, especially when database accesses are concerned.
Runtime Analysis
Runtime Analysis
The runtime analysis is an ABAP workbench tool which is quite useful for analyzing the performance of an ABAP program or transaction. With this tool, the system can display information about the following: Execution time Executed instructions and the hierarchy ordered by execution time or by instruction category Accessed tables and types of access Chronological execution flow This tool can be useful for identifying: Which parts of programs have intensive CPU load Whether parts of programs are or not correctly structured The quantity and type of database access
Creating a Performance Data File (Runtime Analysis)
There are several access points for creating a performance data file used in the runtime analysis tool: From the ABAP workbench initial screen, select Test Runtime analysis. From the ABAP source code editor, select Utilities More utilities Runtime analysis. From the ABAP editor initial screen, select Program Execute Runtime analysis. From any R/3 screen, select System Utilities Runtime analysis Execute. Enter transaction code SE30 in the command field. From the repository browser, select a program or transaction and then select Development object Test/Execute. When a dialog box appears, select Runtime analysis and click Continue. Figure 7 35 shows the initial screen for the runtime analysis. To execute a runtime analysis, perform the following steps in the initial ABAP runtime analysis screen: Select the object you want to analyze by clicking on the corresponding radio button Transaction / Program / Function module. Enter the name of the object to be analyzed in the field next to the radio button. Select the options and restrictions for the analysis. (See the following table.) Click on the Measure runtime icon or Runtime analysis Execute. The system will execute the selected object (program/transaction/function module) and will generate a trace file (performance data file) that can then be analyzed when the execution of the object has finished.
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