Where to download tkprof

There are two primary ways in which recursion occurs. Data dictionary operations can cause recursive SQL operations. When a query references a schema object that is missing from the dictionary cache, a recursive query is executed in order to fetch the object definition into the dictionary cache.

Use of database triggers and stored procedures can also cause recursion. Suppose an application inserts a row into a table that has a database trigger.

When the trigger fires, its statements run at a recursion depth of one. If the trigger invokes a stored procedure, the recursion depth could increase to two. This could continue through any number of levels. The remainder of the entry consists of a row source operation list and optionally an execution plan display. If the explain keyword was not used when the TKPROF report was generated, then the execution plan display will be omitted.

Consider the following example, which is the rest of the entry shown above:. The row source operation listing looks very much like an execution plan. It is close, but not complete. The rows column along the left side of the execution plan contains a count of how many rows of data Oracle processed at each step during the execution of the statement. This is not an estimate from the optimizer, but rather actual counts based on the contents of the SQL trace file.

Again, my experience is with the free version! Meanwhile, simple plan table query scripts like my explain. TKPROF gives the most relevant detail, and the actual row counts on each operation can be very useful in diagnosing performance problems. You can also see that 10 unnecessary parse call were made because there were 11 parse calls for this one statement and that array fetch operations were performed. You know this because more rows were fetched than there were fetches performed.

Of course the execution plan listing will give you insights into how Oracle executes the SQL statements that make up the application, and ways to potentially improve performance. Are bind variables being used, or is every query a unique statement that must be parsed from scratch? Is the application fetching rows one at a time? Is the application reparsing the same cursor thousands of times instead of holding it open and avoiding subsequent parses?

The row counts on the individual operations in an execution plan display can help identify inefficiencies.

Are tables being joined in the wrong order, causing large numbers of rows to be joined and eliminated only at the very end? Are large numbers of duplicate rows being fed into sorts for uniqueness when perhaps the duplicates could have been weeded out earlier on? In this case we have 7 parses for 54 statements which is ok. We want fetches to be less than the number of rows as this will mean we have done less work array fetching.

To see this we can compare [E] and [F]. If arrayfetching was configured then rows could be retrieved with less fetches. Remember that an extra fetch will be done at the end to check that the end of fetch has been reached. In this case we have done reads from the Library cache.

STEP 2 - Examine statements using high resource. STEP 3 - Look for over parsing. This is fine. If [Q] was 1 then the statement would have had 1 hard parse followed by a soft parse which just looks up the already parsed detail in the library cache. This is not a particularly bad example since the query has only been executed a few times.

However excessive parsing should be avoided as far as possible by: o Ensuring that code is shared: - use bind variables - make shared pool large enough to hold query definitions in memory long enough to be reused. Useful queries. Also, it is important to identify whether or not the session is waiting or actually doing work. The following query will help asses this.

Hope this helps. Tracing with Triggers In some cases, you may want to trace when an user connects to the database and only stop when he disconnects. By tracing an Oracle session, which contains one or more SQL statements executed in order, you want find out precisely what statements your session executed, how they were executed by Oracle, and what delays occurred as the statements were executed.

This document sets out how to enable SQL tracing for any Oracle database 8i, 9i, 10g , how to format and interpret the trace files, and where to look next to resolve your performance issues. For more details on the various ways to invoke extended SQL tracing see here. From the DOS command line, find the raw trace file, and issue the command:.

Then, open up the formatted trace file download here with notepad, textpad or similar. The formatted trace file has the following sections:. Copyright c , , Oracle Corporation. All rights reserved. Sort options: default.

Parse 0 0. Execute 1 0. Fetch 0 0. Misses in library cache during parse: 0. Parsing user id: 59 recursive depth: 1. Parse 1 0. Execute 0. Parse 7 0. Execute 50 6. Elapsed times include waiting on following events:.

Event waited on Times Max. Wait Total Waited. If your original file is just corrupted but not lost, then please check the version number of your files.

Method: Click your original file, and then click on the right key to select "Properties" from the pop-up menu, you can see the version number of the files 3. If your operating system is bit, you must download bit files, because bit programs are unable to run in the bit operating system. There is a special case that, the operating system is a bit system, but you are not sure whether the program is bit or bit. If you encounter this situation, check the file path to see whether there are any other files located in.

If yes, please check the properties of these files, and you will know if the file you need is bit or bit. If you still can't find the file you need, you can leave a "message" on the webpage. If you also need to download other files, you can enter the file name in the input box. File Finder:. If you have any further questions or need help, please leave us a message:.

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