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+<!-- keywords: sqlite3_stmt_scanstatus sqlite3_stmt_scanstatus_v2 -->
+<div class=nosearch>
+<a href="../c3ref/intro.html"><h2>SQLite C Interface</h2></a>
+<h2>Prepared Statement Scan Status</h2>
+</div>
+<blockquote><pre>
+int sqlite3_stmt_scanstatus(
+  sqlite3_stmt *pStmt,      /* Prepared statement for which info desired */
+  int idx,                  /* Index of loop to report on */
+  int iScanStatusOp,        /* Information desired.  SQLITE_SCANSTAT_* */
+  void *pOut                /* Result written here */
+);
+int sqlite3_stmt_scanstatus_v2(
+  sqlite3_stmt *pStmt,      /* Prepared statement for which info desired */
+  int idx,                  /* Index of loop to report on */
+  int iScanStatusOp,        /* Information desired.  SQLITE_SCANSTAT_* */
+  int flags,                /* Mask of flags defined below */
+  void *pOut                /* Result written here */
+);
+</pre></blockquote>
+<p>
+These interfaces return information about the predicted and measured
+performance for pStmt.  Advanced applications can use this
+interface to compare the predicted and the measured performance and
+issue warnings and/or rerun <a href="../lang_analyze.html">ANALYZE</a> if discrepancies are found.</p>
+
+<p>Since this interface is expected to be rarely used, it is only
+available if SQLite is compiled using the <a href="../compile.html#enable_stmt_scanstatus">SQLITE_ENABLE_STMT_SCANSTATUS</a>
+compile-time option.</p>
+
+<p>The "iScanStatusOp" parameter determines which status information to return.
+The "iScanStatusOp" must be one of the <a href="../c3ref/c_scanstat_est.html">scanstatus options</a> or the behavior
+of this interface is undefined. The requested measurement is written into
+a variable pointed to by the "pOut" parameter.</p>
+
+<p>The "flags" parameter must be passed a mask of flags. At present only
+one flag is defined - SQLITE_SCANSTAT_COMPLEX. If SQLITE_SCANSTAT_COMPLEX
+is specified, then status information is available for all elements
+of a query plan that are reported by "EXPLAIN QUERY PLAN" output. If
+SQLITE_SCANSTAT_COMPLEX is not specified, then only query plan elements
+that correspond to query loops (the "SCAN..." and "SEARCH..." elements of
+the EXPLAIN QUERY PLAN output) are available. Invoking API
+sqlite3_stmt_scanstatus() is equivalent to calling
+sqlite3_stmt_scanstatus_v2() with a zeroed flags parameter.</p>
+
+<p>Parameter "idx" identifies the specific query element to retrieve statistics
+for. Query elements are numbered starting from zero. A value of -1 may be
+to query for statistics regarding the entire query. If idx is out of range
+- less than -1 or greater than or equal to the total number of query
+elements used to implement the statement - a non-zero value is returned and
+the variable that pOut points to is unchanged.</p>
+
+<p>See also: <a href="../c3ref/stmt_scanstatus_reset.html">sqlite3_stmt_scanstatus_reset()</a>
+</p><p>See also lists of
+  <a href="../c3ref/objlist.html">Objects</a>,
+  <a href="../c3ref/constlist.html">Constants</a>, and
+  <a href="../c3ref/funclist.html">Functions</a>.</p>
+