Understanding sql trace, tkprof and execution plan for beginners. How to trace a concurrent request and generate tkprof file. After the sql trace facility has generated a number of trace files, you can. However, it is a configurable oracle parameter, so it might be different. You might find that your client is the one taking the time so you could optimise your application not the queries it uses. Oracles own tkprof is a commandline tool, the main role is to trace the original files into formatted text file, the easiest use is as follows. Oracle database provides the trcsess commandline utility that consolidates tracing information based on specific criteria. Tkprof is a program that you invoke at the operating system command prompt in order to reformat the trace file into a format that is much easier to comprehend. Tools included on linux unix tool description orachk or exachk. Trace file is not in a understandable format, but to make it easier to understand and readable oracle has provided a utility tkprof. I have confusion about explain plan, autotrace and tkprof. If you need access to the server to get the file, you might as well run tkprof on the server.
To get the most out of the utility you must enable timed statistics by setting the init. Oracle9i database performance tuning guide and reference is an aid for people responsible for the operation, maintenance, and performance of oracle. Used in the explain plan command if specified for oracle to load data temporarily into an oracle table. Tkprof is an oracle database utility used to format sql trace output into human readable format. Identify the query from your application that is taking most time. An efficient way to identify the performance problem is session profiling with tkprof.
The join order lists tables by table name, so you can see when an order you expected did not survive or did not reach the cbos processing. The tkprof executable is located in the oracle homebin directory. This book describes detailed ways to enhance oracle performance by writing and tuning sql properly, using performance tools, and optimizing instance performance. Once the concurrent program is completed successfully, copy the request id and paste it in the following query. Transient kernel profile oracle tool to format a sql trace suggest new definition. Although a client can request the creation of a trace file, the trace file will be created and stored on the server. If the sql trace input file contained statistics from multiple users and the statement was issued by more than one user, then tkprof lists the id of the last user to parse the statement. Tkprof also lists the user id of the user issuing each sql statement. Oracle apps dba related posts including database, dataguard, r12, ebs, weblogic, soa, bi, hyperion and fusion middleware. Application express application builder users guide. Although i have read the documentation it is not much helpful. What is recursive,nonrecursive calls,various options used while using tkprof utility,understanding the tkprof generated output file etc. The first step is to identify where the trace files will be written. It essentially formats a trace file into a more readable format for performance analysis.
Oracle9i database performance tuning guide and reference. Oracle database tips by donald burlesonjuly 22, 2015 formatting trace files with tkprof. Open your concurrent program and check on enable trace. Oracle database generates a trace file for each server process. There have had been numerous questionsposts regarding but how to generate the trace file. Identification of user issuing the sql statement in tkprof. Sql trace generates a low level trace file that has a complete chronological record of everything a session is doing and waiting for when it talks to the database. Analyzing tkprof results tkprof command line options. I am in the process of learning oracle tuning and trying to understand how to read a tkprof report. Now that you have a trace file, your analyst will need to see the tkprof. In order to diagnose a problem say to find out the segments experiencing buffer busy waits, we still have to look at teh raw. How to install tkprof seperately jens petersen mar 16, 2004 9. The sql trace facility and tkprof are two basic performance diagnostic tools that can help.
Oracle database performance tuning tutorial 6 how to use sql. Tracing your session can be a very effective way to debug an application. Many dbas are very familiar with the oracle trace facility, but just in case, here are some. In most situations the tkprof output is ok, but sometimes. Oracle explain plan oracle database internally creates a query execution plan in order to fetch the desired data from the physical tables. Run tkprof on each individual trace file, producing a number of formatted output files, one for each session. When analysing oracle tkprof trace files i have noticed that there is sometimes a big difference between the cpu time and the elapsed time, and i dont know what causes it. Oracle trace file analyzer with database support tools bundle includes the following tools. Understanding sql trace, tkprof and execution plan for beginners 1. Oracle performance tuning and data modelling online training. From a database perspective, each page request is a single database session. Understanding sql trace, tkprof and execution plan for. It is a frequently asked question in almost all the oracle forums. Agenda motivation sql trace tkprof execution plan 3.
The sql trace facility and tkprof are two basic performance diagnostic tools that can help you monitor applications running against the oracle database. Purpose of tkprof and syntax to run it with an example. Ask tom tkprof sort option to find most expensive query. Tkprof can also be used to generate execution plans. Tom, please correct me if i am wrong, but doesnt the tkprof output show only the summary of wait events how many times each occured, etc. Tracing bind variables and waits christian antognini. There are several utilities for analyzing oracle trace files. Oracle 11gr2 tkprof how to capture the recursive calltree. Database performance tuning guide and reference release 2 9.
What is the use of tkprof utility the tkprof is a utility used to convert the oracle trace file generated during sql trace in to a readable format. Ask tom difference of explain plan, autotrace and tkprof. We are presenting here all information about oracle tuning tools like oracle explain plan,autotrace,tkprof. Oracle process id and determine corresponding spid session process id. How to generate trace file sql trace and tkprof in oracle.
In autotrace there are two part, as far as i concern, plan and statistics. End to end application tracing can identify the source of an excessive workload, such as a high load sql statement, by client identifier, service, module, action, session, instance, or an entire database. Its often thought to be an idle event, so nothing to worry about. Understanding sql trace, tkprof and execution plan for beginners carlos sierra 2.
Well, it might seem a heck of a task, however, looking it step by step will make you understand that it is actually not. How to trace a concurrent request and generate tkprof file how to trace a concurrent request and generate tkprof file 1. Tkprof inputs a sql trace outputs an aggregated tkprof report example. If you have a problem query you can user tkprof to get more information. The tkprof program converts oracle trace files into a more readable form. I will explain how to use sql trace, trcsess and tkprof in oracle in this article. I ran a simple query on both to see if it would flag up any obvious differences, which would affect run time accumulatively. Tkprof is listed in the worlds largest and most authoritative dictionary database of abbreviations and acronyms. Here is what i have gathered from reading various blogs. These tools are only available when oracle trace file analyzer is downloaded from document 15912.
You can run the tkprof program to format the contents of the trace file and place the output into a. Tkprof analysis oracle consulting, oracle support and. Formatting trace files with tkprof tkprof is one of the most useful utilities available to dbas for diagnosing performance issues. Trace file is not in a understandable format, but to make it easier to understand and readable oracle has provided a. Sqlnet message from client means the time taken by oracle waiting for input from the client that you are connecting with.
The goal of this article is to show how to use an oracle event to obtain more. Scribd is the worlds largest social reading and publishing site. Hi, how to use tkprof utility and run the tkprof utility. The user must specify the schema and table name for the plan table. Oracle provides several tracing tools that can help you monitor and analyze applications running against an oracle database. The sql trace facility and tkprof are two basic performance diagnostic tools that can help you monitor and tune applications running against the oracle server this chapter contains the following sections. There is a newer version of this article here the tkprof program converts oracle trace files into a more readable form. That second article has a pdf attached that explains quite a bit. Tkprof viewer upload oracle tkprof output, sort and analyze sql performance for tuning. Oracle9i database performance tuning guide and reference, release 2 9. Tkprof accepts as input a trace file produced by the sql trace facility, and it produces a formatted output file. Run tkprof on each individual trace file, producing a number of formatted output files, one for each.
Go through a 10053 output to find why oracle ignores a hint or thinks it is smarter than you. These include trace assist trcasst, session tracer trcsess, trace analyzer trcanlzr. Trace a concurrent request and generate tkprof file. When and how to use it as an oracle specialist youve probably heard of sql trace and its brother tkprof.
One little trick is to grep for lines starting join order and best so far. What is the use of tkprof utility the tkprof is a utility used to convert the oracle trace file generated during sql trace in. You can run tkprof utility for concatenated trace files to produce a formatted output file. If you enable sql tracing, then oracle application express creates a temporary file you can then analyze using the tkprof utility. When explain plain showing to us the prediction about how optimizer will work to produce result and tkprof show the real thing that happen, so how about autotrace.