What is Tkprof in Oracle with example?

TKPROF determines execution plans by issuing the EXPLAIN PLAN statement after connecting to Oracle with the user and password specified in this parameter. The specified user must have CREATE SESSION system privileges. TKPROF takes longer to process a large trace file if the EXPLAIN option is used.

What is Tkprof file?

The TKPROF program converts Oracle trace files into a more readable form. If you have a problem query you can user TKPROF to get more information. To get the most out of the utility you must enable timed statistics by setting the init. ora parameter or performing the following command.

How do you read a Tkprof output?

Each tkprof output file contains a header, body, and summary section. The header simply displays the trace file name, definitions, and sort options selected. The body contains the performance metrics for SQL statements.

How do I enable traces in Oracle SQL Developer?

To enable the SQL trace facility for your current session, enter: ALTER SESSION SET SQL_TRACE = TRUE; Alternatively, you can enable the SQL trace facility for your session by using the DBMS_SESSION.

What does autotrace do in Oracle?

The autotrace utility is a very underutilized feature of SQL*Plus. It offers statement tracing and instant feedback on any successful SELECT, INSERT, UPDATE or DELETE statement. The autotrace provides instantaneous feedback including the returned rows, execution plan, and statistics.

Where is Tkprof?

TKProf is an Oracle database utility used to format SQL Trace output into human readable format. The TKProf executable is located in the ORACLE HOME/bin directory.

What is TRC file in Oracle?

Diagnostic data file produced by Oracle database software; includes a detailed sequence of statements that describe events as they are executed; can be used to identify events that led to a database error or for other database analysis.

When can we use the where current of clause?

The WHERE CURRENT OF clause is used in some UPDATE and DELETE statements. The WHERE CURRENT OF clause in an UPDATE or DELETE statement states that the most recent row fetched from the table should be updated or deleted. We must declare the cursor with the FOR UPDATE clause to use this feature.

What is the difference between Tkprof and explain plan?

This example shows TKPROF being run to format a trace file named “dsdb2_ora_18468. trc” and writing it to a formatted output file named “dsdb2_trace. out”. The EXPLAIN PLAN command displays the execution plan chosen by the Oracle optimizer for SELECT, UPDATE, INSERT, and DELETE statements.

What is elapsed time in Tkprof report?

TKPROF Elapsed Time Challenge – the Elapsed Time is Half of the Wait Event Time. Mich noticed that the reported elapsed time, at 1,245.41 seconds, is less than the sum of the wait event times, at 2,400.00 seconds.

How do I turn on SQL trace?

To use a SQL Trace template, follow these steps:

  1. Determine what version of SQL Server you have and double-click the link below to download the zip file of SQL templates.
  2. Within SQL Profiler, click on File | New Trace.
  3. Click RUN to start the trace and the SQL Profiler window will open and the trace is now running.

How many fields are present in trace file?

This type of the trace file has about 21 columns that records each event occurs through simulation time such as event type, event time, and packet number, etc.