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+<!-- keywords: sqlite3_profile sqlite3_trace -->
+<div class=nosearch>
+<a href="intro.html"><h2>SQLite C Interface</h2></a>
+<h2>Tracing And Profiling Functions</h2>
+</div>
+<blockquote><pre>
+void *sqlite3_trace(sqlite3*,
+   void(*xTrace)(void*,const char*), void*);
+void *sqlite3_profile(sqlite3*,
+   void(*xProfile)(void*,const char*,sqlite3_uint64), void*);
+</pre></blockquote>
+<p>
+These routines are deprecated. Use the <a href="../c3ref/trace_v2.html">sqlite3_trace_v2()</a> interface
+instead of the routines described here.</p>
+
+<p>These routines register callback functions that can be used for
+tracing and profiling the execution of SQL statements.</p>
+
+<p>The callback function registered by sqlite3_trace() is invoked at
+various times when an SQL statement is being run by <a href="../c3ref/step.html">sqlite3_step()</a>.
+The sqlite3_trace() callback is invoked with a UTF-8 rendering of the
+SQL statement text as the statement first begins executing.
+Additional sqlite3_trace() callbacks might occur
+as each triggered subprogram is entered.  The callbacks for triggers
+contain a UTF-8 SQL comment that identifies the trigger.</p>
+
+<p>The <a href="../compile.html#trace_size_limit">SQLITE_TRACE_SIZE_LIMIT</a> compile-time option can be used to limit
+the length of <a href="../lang_expr.html#varparam">bound parameter</a> expansion in the output of sqlite3_trace().</p>
+
+<p>The callback function registered by sqlite3_profile() is invoked
+as each SQL statement finishes.  The profile callback contains
+the original statement text and an estimate of wall-clock time
+of how long that statement took to run.  The profile callback
+time is in units of nanoseconds, however the current implementation
+is only capable of millisecond resolution so the six least significant
+digits in the time are meaningless.  Future versions of SQLite
+might provide greater resolution on the profiler callback.  Invoking
+either <a href="../c3ref/profile.html">sqlite3_trace()</a> or <a href="../c3ref/trace_v2.html">sqlite3_trace_v2()</a> will cancel the
+profile callback.
+</p><p>See also lists of
+  <a href="objlist.html">Objects</a>,
+  <a href="constlist.html">Constants</a>, and
+  <a href="funclist.html">Functions</a>.</p>
+