Reading SQL 10053 trace files - Burleson Oracle Consulting.
Tom, I wanted to let you and the readers know that there is a freeware 10053 trace file viewer. The viewer uses a navigation section, similar to the Contents section in PDF reader, for example. It allows jumping to the most important parts of 10053 trace.
Oracle has an more detailed script alternative to the 10053 trace called SQLTXPLAIN.SQL - Enhanced Explain Plan and related diagnostic info for one SQL statement. Feel free to ask questions on our Oracle forum. All legitimate Oracle experts publish their Oracle qualifications.
CONCEPT AND ANALYSIS USING 10053 TRACE Introduction This paper is to explore cost based query transformation introduced in 10g and enhanced in 11g. Trace files generated from 10053 events are analyzed to further explore and analyze these. Oracle version 10g introduces transformations which are logical rewrites of original SQL.
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Then Oracle shuffles the values around so no value appears in more than one bucket. It's more complicated than this, but this gives the principle. As your example shows, when your number of buckets is much smaller than the NDV then you can end up with some unexpected results. 2. Yes you can see the density the optimizer used in the 10053 trace.
Oracle events are designed to cause the Oracle kernel to act in ways that are not consistent with the default operation of the Oracle database. Events are used for debugging, to avoid bugs, and to trace Oracle database activity. In this paper, we will review the Oracle 10046 event in particular, and see how it can be useful in performance.
The trace data includes SQL tracing (event 10046) and optimizer tracing (event 10053).. Oracle Database generates a trace file containing statistics for traced SQL statements for that session. When the SQL Trace facility is enabled for an instance, Oracle Database creates a separate trace file for each process.. While TKPROF provides a.
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Re: what does Grouping column cardinality mean in 10053 trace ?, oracle-l at FreeLists.
RE: Learning more about and reading 10053 trace files, oracle-l at FreeLists.
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That said, Oracle's estimate of cardinality is a primary driver in execution plan. A 10053 trace analysis (Jonathan Lewis' Cost-Based Oracle Fundamentals book has wonderful examples from 8i to 10.1) can help shed light on why your statement's now broken and how the LEADING hint fixes it.
When the SQL Trace facility is enabled for a session, Oracle generates a trace file containing statistics for traced SQL statements for that session. When the SQL Trace facility is enabled for an instance, Oracle creates a separate trace file for each process.
