137 lines
5.1 KiB
HTML
137 lines
5.1 KiB
HTML
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<!DOCTYPE html>
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<html><head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<link href="../sqlite.css" rel="stylesheet">
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<title>Tracing And Profiling Functions</title>
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<!-- path=../ -->
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</head>
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<body>
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<a href="../index.html">
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Small. Fast. Reliable.<br>Choose any three.
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<li><a href="../index.html">Home</a>
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<li><a href='../about.html'>About</a>
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<li><a href='../docs.html'>Documentation</a>
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<li><a href='../download.html'>Download</a>
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<li><a href='../support.html'>Support</a>
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<li><a href='../prosupport.html'>Purchase</a>
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</div>
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<!-- keywords: sqlite3_profile sqlite3_trace -->
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<div class=nosearch>
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<a href="intro.html"><h2>SQLite C Interface</h2></a>
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<h2>Tracing And Profiling Functions</h2>
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</div>
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<blockquote><pre>
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void *sqlite3_trace(sqlite3*,
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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>
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<p>
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These routines are deprecated. Use the <a href="../c3ref/trace_v2.html">sqlite3_trace_v2()</a> interface
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instead of the routines described here.</p>
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<p>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 <a href="../compile.html#trace_size_limit">SQLITE_TRACE_SIZE_LIMIT</a> compile-time option can be used to limit
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the length of <a href="../lang_expr.html#varparam">bound parameter</a> expansion in the output of sqlite3_trace().</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. Invoking
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either <a href="../c3ref/profile.html">sqlite3_trace()</a> or <a href="../c3ref/trace_v2.html">sqlite3_trace_v2()</a> will cancel the
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profile callback.
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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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