Oracle's TKPROF-优快云博客

本文介绍了如何使用Oracle的TKPROF工具进行SQL跟踪和性能分析。包括如何启用SQL跟踪、设置定时统计信息、查找SQL跟踪文件及使用TKPROF解析跟踪文件的方法。

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TKPROF stands for transient kernel profiler[@more@]

Oracle's TKPROF

TKPROF stands for transient kernel profiler.

Enabling SQL TRACE

To be able to use TKPROF, you must first enable sql trace. This can be done for either the instance or the session. If you want to change it for the entire instance, set sql_trace=true into the init.ora file and restart the instance. However, usually, you'll want to turn on sql trace for a particular session only. This can be done like so:

=true;

or, from another session with a

sys.(session's id,serial number, true)

Timed Statistics

You can have Oracle include timing information into the sql trace files as well. Either set the timed_statistics parameter to true or issue an

=true;

=true;

Finding the SQL trace file

The trace files will be written into the directory pointed to by the parameter user_dump_dest. You can query for the value with select value from v$parameter where name = 'user_dump_dest'.

See find the trace file to see where the tk prof file goes.

Format of the trace file

See this link.

Maximum size of the trace file

The init parameter max_dump_file_size allows to set the maximum size of the trace files. Valid values for this parameter are: unlimited, a number followed by a K or a M or a number. If the value is a number only, it indicates how many OS Blocks the file can grow to. K or M set the file's maximum size in kilo or mega bytes.