Interpreting tkprof in oracle 11g download

In the previous post oracle tkprof usage, we saw how to generate a sql trace and then how to format it using tkprof. If you decide to install it, make sure to install it to a different oracle. Mar, 2007 for real it is not possible, but in the tkprof file you may see this behaviour sometimes. The tkprof executable is located in the oracle homebin directory.

Here is what i have gathered from reading various blogs. 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. If the table exists all rows will be deleted otherwise tkprof will create the table and use it. I suppose, even without clearing the oracle buffer cache this anomaly could arise.

This is available for download from metalink and can be installed on any version. Link for oracle tkprof fundamentals part2 interpret tkprof report s. I did a trace on a sql statement and the output looks like gibberish. 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. Interpreting row source operation output of tkprof oracle 9ir2. When something takes less than that amount of time, it can be summed as 0 sec or as 0. Well considering the table names in your select statement dont appear to match the table names in your tkprof output i dont really see how we can give you any meaningfull help. Trace file is not in a understandable format, but to make it easier to understand and readable oracle has provided a utility tkprof. 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. Remember that all the information in tkprof is available from the base trace file. I am in the process of learning oracle tuning and trying to understand how to read a tkprof report.

I will now proceed with caution when clearing the buffer cache and interpreting the results of the tkprof report. Tkprof is an oracle database utility used to format sql trace output into human readable format. Tkprof is an executable that parses oracle trace files to produce more readable output. Oracle provides several tracing tools that can help you monitor and analyze applications running against an oracle database. Deployed and tuned tbs databases successfully on various platforms such as linux and windows etc. The sql trace facility and tkprof are two basic performance diagnostic tools that can help. If you have a system that is performing badly, a good way to identify problem sql statements is to trace a typical user session and then use tkprof to format the output. This oracle documentation was created as a support and oracle training reference for use by our dba performance tuning consulting professionals.

Sql trace, 10046, trcsess and tkprof in oracle oraclebase. It is free to download and use out of my oracle support mos, previously known as. I installed oracle client base and also tried installing oracle client runtime 11g and while that install has sqlplus. Run the explain plan on the users sql statements in the trace file. I wanted to get your opinion whether the db file sequential read and db file parallel read due to the huge size of the table. Also, unlike tkprof, awr is a separately licensed product, requiring the diagnostic and tuning pack licenses. This book includes scripts and tools to hypercharge oracle 11g performance and you can buy it for 30% off directly from the publisher. Oraclebase sql trace, 10046, trcsess and tkprof in oracle. Only thing i can possibly suggest without a select and tkprof that actually match up is do you really need to use outer joins. Jan 09, 2011 trace a concurrent request and generate tkprof file. The user must specify the schema and table name for the plan table. Identify the query from your application that is taking most time. I am using toad 11g and it seems to require a directory location of that file in order to perform a trace. Oracle net refers to the generic process communication between sqlplus and the server, regardless of whether oracle net is installed.

Trace a concurrent request and generate tkprof file oracle. Although i have read the documentation it is not much helpful. May 05, 2016 interpreting trace file output the parse phase oracle finds the query in the shared pool or creates a new plan for the query hard parse. Oracle tkprof fundamentals part 2 interpret tkprof report. The quickest way to capture the sql being processed by a session is to switch on sql trace or set the 10046 event for a representative period of time. Tkprof viewer upload oracle tkprof output, sort and analyze sql performance for tuning. This can then be interpreted using tkprof at the commmand prompt as follows. Dec 06, 2016 purpose of tkprof and syntax to run it with an example. Understanding tkprof output oracle database internal. Sep, 2004 interpretation of the results generally consists of looking for the highest time and resource consumption, and then determining if they can be reduced. We are running the following sql in our databae oracle 11g r2 rac installation and below is the output from tkprof. If you have a problem query you can user tkprof to get more informatio.

In that post we create a trace for following sql statement. Now that you have a trace file, your analyst will need to see the tkprof. I ran a simple query on both to see if it would flag up any obvious differences, which would affect run time accumulatively. Understanding sql trace, tkprof and execution plan for beginners. Pinning this table to the keep buffer we improved the owerall reaction time of the application. When tkprof adds all those values up, you might occasionally see that total cpu total elapsed 2. Looking at the tkprof output, the only thing i see of relevance is the cpu time on production is more for the fetch, the elapsed time is also more, but not to the same percentage as the cpu usage. There is a newer version of this article here the tkprof program converts oracle trace files into a more readable form. Oracle tkprof fundamentals part 2 video will cover interpretation of tkprof report. This post will describe many useful information regarding tkprof files which should definitely help you familiarize with the tkprof files. Ask tom tkprof sort option to find most expensive query. When and how to use it as an oracle specialist youve probably heard of sql trace and its brother tkprof. 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.

You cannot change the default format of the statistics report. Find out a way to visually capture the recursive call trees in the tkprof output sysyes specified. 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. If you have a problem query you can user tkprof to get more information. The client referred to in the statistics is sqlplus. 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. The execute phase this is the work done by oracle on open or execute of the query. 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. In this post we would interpret tkprof output of that sql query. The output reports 4,077 disk reads in the fetch line with an elapsed time of 4. What is recursive,nonrecursive calls,various options used while using tkprof utility,understanding the tkprof generated output file etc. Aug 31, 20 oracle tkprof fundamentals part 2 video will cover interpretation of tkprof report. Generally, an ebook can be downloaded in five minutes or less. Tkprof analysis oracle consulting, oracle support and.