Which session is traced

The trace for the user session is scattered across different trace files belonging to different processes, which makes it difficult to get a complete picture of the life cycle of a session. You must specify one of the session , clientid , service , action , or module options. Specifies the file where the output is generated.

If this option is not specified, then the utility writes to standard output. Consolidates the trace information for the session specified. The session identifier is a combination of session index and session serial number, such as In this example, the session index and serial number equals All files in current directory are taken as input.

The input and output files are the only required arguments. Specifies the input file, a trace file containing statistics produced by the SQL Trace facility. This file can be either a trace file produced for a single session, or a file produced by concatenating individual trace files from multiple sessions.

Specifies whether to record summary for any wait events found in the trace file. Sorts traced SQL statements in descending order of specified sort option before listing them in the output file. If multiple options are specified, then the output is sorted in descending order by the sum of the values specified in the sort options. Sort options are listed as follows:. Lists only the first integer sorted SQL statements from the output file.

This parameter does not affect the optional SQL script. Creates a SQL script that stores the trace file statistics in the database. This script creates a table and inserts a row of statistics for each traced SQL statement into the table.

Specifies the schema and name of the table into which TKPROF temporarily places execution plans before writing them to the output file. These individuals can specify different TABLE values and avoid destructively interfering with each other's processing on the temporary plan table.

Determines the execution plan for each SQL statement in the trace file and writes these execution plans to the output file. Note: Trace files generated immediately after instance startup contain data that reflects the activity of the startup process. For the purposes of tuning, ignore such trace files. You can use this script to replay the user events from the trace file. Each row corresponds to one of three steps of SQL statement processing.

Statistics are identified by the value of the CALL column. See Table Translates the SQL statement into an execution plan, including checks for proper security authorization and checks for the existence of tables, columns, and other referenced objects. Actual execution of the statement by Oracle Database. Retrieves rows returned by a query. The other columns of the SQL Trace facility output are combined statistics for all parses, executions, and fetches of a statement. Total CPU time in seconds for all parse, execute, or fetch calls for the statement.

Total elapsed time in seconds for all parse, execute, or fetch calls for the statement. Total number of data blocks physically read from the data files on disk for all parse, execute, or fetch calls. Total number of buffers retrieved in consistent mode for all parse, execute, or fetch calls. Usually, buffers are retrieved in consistent mode for queries. Total number of buffers retrieved in current mode. Statistics about the processed rows appear in the ROWS column.

The column shows the number of rows processed by the SQL statement. This total does not include rows processed by subqueries of the SQL statement. The row source counts are displayed when a cursor is closed.

Exiting or reconnecting causes the counts to be displayed. These statistics appear on separate lines following the tabular statistics. In " Examples " , the statement resulted in one library cache miss for the parse step and no misses for the execute step. In the TKPROF output, row source operations show the number of rows processed for each operation executed on the rows, and additional row source information, such as physical reads and writes.

To ensure that wait events information is written to the trace file for the session, run the following SQL statement:. This example is likely to be longer than a single line on the screen, and you might need to use continuation characters, depending on the operating system.

You can use this to get access paths and row source counts. In this way, you can ignore internal Oracle Database statements such as temporary table operations. For greatest efficiency, always use SORT parameters.

Views Relevant for Trace Statistics. Views Related to Enabling Tracing. The trace type specifies whether the trace is enabled for client identifier, session, service, database, or a combination of service, module, and action. Overview of End-to-End Application Tracing End-to-end application tracing can identify the source of an excessive database workload, such as a high load SQL statement, by client identifier, service, module, action, session, instance, or an entire database.

Purpose of End-to-End Application Tracing End-to-End application tracing simplifies diagnosing performance problems in multitier environments. Level 4 - The same as level 2, but with the addition of bind variable values.

Level 8 - The same as level 2, but with the addition of wait events. Level 12 - The same as level 2, but with the addition of both bind variable values and wait events.

For all sessions in the database NOTE: Please be cautious when setting system wide, as this will impact performance due to every session being traced.

Warning: Setting the event for the entire database is not recommended. This can cause severe performance issues. What is a Session Trace? This will work only for console communications - where NCM is actively logging into the device to run commands, in order to download, upload or change a configuration. Please refer to the below article to enable or disable tracing:. Net SWTelnet9 Version 9.

At this point, NCM has successfully connected, and is ready to begin sending commands to the device. See points above for explanations of initial communication. NCM begins to log into Enable Mode - it sends 'enable', then waits for the echo and response. Note: It's common to see a device echo back the command with a few letters at a time like above. If this was on the screen, the user would see 'enable' echoed correctly.

The device has echoed the enable command, and requested a password. At this point, NCM processes the second request for a password as a failure to log in, and disconnects from the device.

Example 2: Logging into a device when NCM has been configured with the wrong enable password. NCM detects the command prompt, and sets a variable to remember this, so that it can match for it later.

It sends a few empty commands enter key , to confirm the prompt before setting the variable. NCM sends the command 'terminal width 0', as part of setting the device to display the entire configuration in one go, so that it will not need to 'spacebar' through '--More—' prompts. Unfortunately, the device does not understand this command, and the device echoes the entire command back to NCM, along with an error message. NCM must now process all lines received from the device, including the error message, and the command it initially sent.

It must find the prompt before it can send the next command. The same thing happens when NCM attempts to send the 'terminal length 0' command. To start a buffered trace session, use the -buffering parameter of the tracelog -start command.

For more information, see Tracelog Command Syntax. A private trace session is a trace session that runs in user mode as part of the user-mode process that it traces. Standard tracing sessions run in the kernel. Private trace sessions are also known as user-mode trace sessions or process trace sessions. You can run more than one private trace session at a time, but you can run only one private trace session in each process. You cannot perform real-time tracing of a private trace session.

The trace messages must be written to a log. The buffers used in private trace sessions are always pageable. You cannot specify paged or nonpaged memory for these buffers. You cannot send the trace messages from a private trace session to the debugger. For more information about private event tracing sessions, see the Microsoft Windows SDK documentation.