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<a href="intro.html"><h2>SQLite C Interface</h2></a><h2>Tracing And Profiling Functions</h2><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 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. The
sqlite3_profile() function is considered experimental and is
subject to change in future versions of SQLite.
</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>
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