What is set autotrace on?
SET AUTOTRACE TRACEONLY. Like SET AUTOTRACE ON , but suppresses the printing of the user’s query output, if any. To use this feature, you must create a PLAN_TABLE table in your schema and then have the PLUSTRACE role granted to you.
What does autotrace do in Oracle?
The autotrace utility is a very underutilized feature of SQL*Plus. It offers statement tracing and instant feedback on any successful SELECT, INSERT, UPDATE or DELETE statement. The autotrace provides instantaneous feedback including the returned rows, execution plan, and statistics.
What is Plustrace role in Oracle?
It is useful for monitoring and tuning the performance of these statements. Normally the non sys user can not user ‘set autotrace on’ to check tracing output. In order to let the normal user use this featuer we have to install ‘plustrace’ role. [oracle@testsrv]$ sqlplus / as sysdba.
What does autotrace mean?
Autotracing is a technique for producing a vector image from a bitmapped image. Autotracing focuses on copying or converting a printable image into an outlined object.
How do I run autotrace?
The AUTOTRACE command generates similar information, as shown in the next listing. To use AUTOTRACE, the user must possess the PLUSTRACE role (by running plustrce. sql, which is usually located in the ORACLE_HOME/sqlplus/admin directory). The AUTOTRACE option provides an EXPLAIN PLAN and statistics for a query.
What is TKProf?
TKProf is an Oracle database utility used to format SQL Trace output into human readable format. The TKProf executable is located in the ORACLE HOME/bin directory.
When to use AutoTrace explain in Oracle SQL?
“set autotrace trace explain”. autotrace traceonly – Displays execution plan and statistics without displaying the returned rows. This option should be used when a large result set is expected. Oracle autotrace is so easy to use that it should be the first tracing utility used for most SQL performance tuning issues.
How to set AutoTrace on the autotracereport?
SET AUTOTRACE ON The AUTOTRACEreport includes both the optimizer execution path and the SQL statement execution statistics. SET AUTOTRACE TRACEONLY Like SETAUTOTRACEON, but suppresses the printing of the user’s query output, if any.
How to show the execution plan in AutoTrace?
• autotrace trace explain – Displays the execution plan for a select statement without actually executing it. “set autotrace trace explain” • autotrace traceonly – Displays execution plan and statistics without displaying the returned rows. This option should be used when a large result set is expected.
How to set AutoTrace traceon 6 rows in SQL?
To trace the same statement without displaying the query data, enter: SET AUTOTRACE TRACEONLY / 6 rows selected.
