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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*);
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void *sqlite3_profile(sqlite3*,
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void(*xProfile)(void*,const char*,sqlite3_uint64), void*);
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</pre></blockquote><p>
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These routines register callback functions that can be used for
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tracing and profiling the execution of SQL statements.</p>
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<p>The callback function registered by sqlite3_trace() is invoked at
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various times when an SQL statement is being run by <a href="../c3ref/step.html">sqlite3_step()</a>.
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The sqlite3_trace() callback is invoked with a UTF-8 rendering of the
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SQL statement text as the statement first begins executing.
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Additional sqlite3_trace() callbacks might occur
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as each triggered subprogram is entered. The callbacks for triggers
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contain a UTF-8 SQL comment that identifies the trigger.</p>
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<p>The callback function registered by sqlite3_profile() is invoked
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as each SQL statement finishes. The profile callback contains
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the original statement text and an estimate of wall-clock time
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of how long that statement took to run. The profile callback
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time is in units of nanoseconds, however the current implementation
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is only capable of millisecond resolution so the six least significant
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digits in the time are meaningless. Future versions of SQLite
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might provide greater resolution on the profiler callback. The
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sqlite3_profile() function is considered experimental and is
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subject to change in future versions of SQLite.
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</p><p>See also lists of
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<a href="objlist.html">Objects</a>,
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<a href="constlist.html">Constants</a>, and
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<a href="funclist.html">Functions</a>.</p>
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