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<title>About Trigger Compilation and Dependencies</title>
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<div class="sect1">
<h1>About Trigger Compilation and Dependencies</h1>
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<p><a id="sthref603" name="sthref603"></a><a id="sthref604" name="sthref604"></a><a id="sthref605" name="sthref605"></a>Running a <code>CREATE</code> <code>TRIGGER</code> statement compiles the trigger being created. If this compilation causes an error, the <code>CREATE</code> <code>TRIGGER</code> statement fails. To see the compilation errors, run this statement:</p>
<pre xml:space="preserve" class="oac_no_warn">
SELECT * FROM USER_ERRORS WHERE TYPE = 'TRIGGER';
</pre>
<p>Compiled triggers depend on the schema objects on which they are defined. For example, <code>NEW_EVALUATION_TRIGGER</code> depends on the <code>EVALUATIONS</code> table:</p>
<pre xml:space="preserve" class="oac_no_warn">
CREATE OR REPLACE
<span class="bold">TRIGGER NEW_EVALUATION_TRIGGER</span>
BEFORE INSERT <span class="bold">ON EVALUATIONS</span>
FOR EACH ROW
BEGIN
  :NEW.evaluation_id := evaluations_seq.NEXTVAL;
END;
</pre>
<p>To see the schema objects on which triggers depend, run this statement:</p>
<pre xml:space="preserve" class="oac_no_warn">
SELECT * FROM ALL_DEPENDENCIES WHERE TYPE = 'TRIGGER';
</pre>
<p>If an object on which a trigger depends is dropped, or changed such that there is a mismatch between the trigger and the object, then the <a id="sthref606" name="sthref606"></a><a id="sthref607" name="sthref607"></a>trigger is invalidated. The next time the trigger is invoked, it is <a id="sthref608" name="sthref608"></a>recompiled. To recompile a trigger immediately, run the <a id="sthref609" name="sthref609"></a><code>ALTER</code> <code>TRIGGER</code> statement with the <code>COMPILE</code> clause. For example:</p>
<pre xml:space="preserve" class="oac_no_warn">
ALTER TRIGGER NEW_EVALUATION_TRIGGER <span class="bold">COMPILE</span>;
</pre>
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<h2>Related Topics</h2>
<p><a href="javascript:open('http://www.oracle.com/pls/db112/lookup?id=LNPLS2007','newWindow').focus()"><span class="italic">Oracle Database PL/SQL Language Reference</span></a></p>
<p><a href="tdddg_triggers.htm#BABIEDEF">Using Triggers</a></p>
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