mysql执行时间

Question

有没有办法在mysql中获取最后执行的查询的执行时间？

Answer 1

mysql有一个内置的分析器.您可以通过发出set profiling=1;和使用show profiles;来启用分析,以获得执行时间.

Answer 2

如果使用PHP ..您可以在查询之前和查询之后使用microtime()来确定查询执行所需的时间.

$sql_query='SELECT * FROM table';
$msc=microtime(true);
$mysql_query($sql_query);
$msc=microtime(true)-$msc;
echo $msc.' seconds'; // in seconds
echo ($msc*1000).' milliseconds'; // in millseconds

Answer 3

试试这个...

mysql_query("SET profiling = 1;");
if (mysql_errno()) { die( "ERROR ".mysql_errno($link) . ": " . mysql_error($link) ); }

/* It goes without saying that this is your actual query that you want to measure the execution time of */
$query="SELECT some_field_name FROM some_table_name";
$result = mysql_query($query);
if (mysql_errno()) { die( "ERROR ".mysql_errno($link) . ": " . mysql_error($link) ); }

$exec_time_result=mysql_query("SELECT query_id, SUM(duration) FROM information_schema.profiling GROUP BY query_id ORDER BY query_id DESC LIMIT 1;");
if (mysql_errno()) { die( "ERROR ".mysql_errno($link) . ": " . mysql_error($link) ); }
$exec_time_row = mysql_fetch_array($exec_time_result);

echo "<p>Query executed in ".$exec_time_row[1].' seconds';