TKPROF output can be generated from a raw SQL Trace. It formats and summarizes the diagnostic information from the raw SQL Trace.TKPROF allows you to analyse a trace file in easy way to determine where time is being spent and what query plans are being used on SQL statements.
This post is part 2 of the below posts on trace and tkprof. Please refer other posts to read related information.
Part 1: Trace and the methods to generate trace
Part 2: Generating TKPROF from trace file
Part 3: Analyzing TKPROF files
Part 4: Using Trace Analyzer (TRCANLZR) Tool
This post will cover Part 2: Generating a tkprof file from trace file.
WHAT DOES A TKPROF FILE CONTAINS:
- SQL Text that were executed
- Timing information: The execution count, elapsed time, CPU time, physical reads (disk), logical reads (query/current) and the number of rows returned for each SQL. This is further broken down into Parse, Execute and Fetch stages.
- Wait information: The times waited, maximum wait and total waited for each database wait event, both for each SQL and for the whole period of the trace. It only does this if the level is 8 (with waits) or 12 (with waits and binds). At least level 8 is recommend because it gives this extra information.
- Execution Plan: The runtime execution plan for each SQL with the actual row source operation counts for each execution plan line. It only does this if the cursor has been closed for the SQL (in 10g and before) or the row source statistics for the SQL have been written to the trace. The execution plan will also contain the actual tables accessed if the SQL uses views or synonyms.
It also contains information like Library cache misses (hard parse) and total SQL and wait statistics for Recursive and Non-recursive SQL Statements
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