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The SQL Execution preferences you set determine how SQL is executed.

Select Preferences > SQL Execution.

SQL Query Tuner 18.4 > Specify SQL Execution Preferences > SQL Execution.png

The following describes the SQL Execution Preference options available.

Enable auto-commit for the following platforms: When disabled, the SQL is executed within transactions that must be manually committed.
Enable DBMS output (Oracle only): When disabled, this omits the output statements that Oracle would otherwise display.

If you disable auto-commit for a platform, you must use SQL Editor's transaction features to execute code on that platform.