mysqlnd_qc_get_normalized_query_trace_log
(PECL mysqlnd_qc >= 1.0.0)
mysqlnd_qc_get_normalized_query_trace_log — Returns a normalized query trace log for each query inspected by the query cache
说明
mysqlnd_qc_get_normalized_query_trace_log ( void ) : arrayReturns a normalized query trace log for each query inspected by the query cache. The collection of the trace log is disabled by default. To collect the trace log you have to set the PHP configuration directive mysqlnd_qc.collect_normalized_query_trace to 1
Entries in the trace log are grouped by the normalized query statement. The normalized query statement is the query statement with all statement parameter values being replaced with a question mark. For example, the two statements SELECT id FROM test WHERE id = 1 and SELECT id FROM test WHERE id = 2 are normalized as SELECT id FROM test WHERE id = ?. Whenever a statement is inspected by the query cache which matches the normalized statement pattern, its statistics are grouped by the normalized statement string.
参数
此函数没有参数。
返回值
An array of query log. Every list entry contains the normalized query stringand further detail information.
范例
Example #1 mysqlnd_qc_get_normalized_query_trace_log() example
mysqlnd_qc.collect_normalized_query_trace=1
<?php
/* Connect, create and populate test table */
$mysqli = new mysqli("host", "user", "password", "schema", "port", "socket");
$mysqli->query("DROP TABLE IF EXISTS test");
$mysqli->query("CREATE TABLE test(id INT)");
$mysqli->query("INSERT INTO test(id) VALUES (1), (2)");
/* not cached */
$res = $mysqli->query("SELECT id FROM test WHERE id = 1");
var_dump($res->fetch_assoc());
$res->free();
/* cache put */
$res = $mysqli->query("/*" . MYSQLND_QC_ENABLE_SWITCH . "*/" . "SELECT id FROM test WHERE id = 2");
var_dump($res->fetch_assoc());
$res->free();
/* cache hit */
$res = $mysqli->query("/*" . MYSQLND_QC_ENABLE_SWITCH . "*/" . "SELECT id FROM test WHERE id = 2");
var_dump($res->fetch_assoc());
$res->free();
var_dump(mysqlnd_qc_get_normalized_query_trace_log());
?>
以上例程会输出：
array(1) {
["id"]=>
string(1) "1"
}
array(1) {
["id"]=>
string(1) "2"
}
array(1) {
["id"]=>
string(1) "2"
}
array(4) {
[0]=>
array(9) {
["query"]=>
string(25) "DROP TABLE IF EXISTS test"
["occurences"]=>
int(0)
["eligible_for_caching"]=>
bool(false)
["avg_run_time"]=>
int(0)
["min_run_time"]=>
int(0)
["max_run_time"]=>
int(0)
["avg_store_time"]=>
int(0)
["min_store_time"]=>
int(0)
["max_store_time"]=>
int(0)
}
[1]=>
array(9) {
["query"]=>
string(27) "CREATE TABLE test (id INT )"
["occurences"]=>
int(0)
["eligible_for_caching"]=>
bool(false)
["avg_run_time"]=>
int(0)
["min_run_time"]=>
int(0)
["max_run_time"]=>
int(0)
["avg_store_time"]=>
int(0)
["min_store_time"]=>
int(0)
["max_store_time"]=>
int(0)
}
[2]=>
array(9) {
["query"]=>
string(40) "INSERT INTO test (id ) VALUES (? ), (? )"
["occurences"]=>
int(0)
["eligible_for_caching"]=>
bool(false)
["avg_run_time"]=>
int(0)
["min_run_time"]=>
int(0)
["max_run_time"]=>
int(0)
["avg_store_time"]=>
int(0)
["min_store_time"]=>
int(0)
["max_store_time"]=>
int(0)
}
[3]=>
array(9) {
["query"]=>
string(31) "SELECT id FROM test WHERE id =?"
["occurences"]=>
int(2)
["eligible_for_caching"]=>
bool(true)
["avg_run_time"]=>
int(159)
["min_run_time"]=>
int(12)
["max_run_time"]=>
int(307)
["avg_store_time"]=>
int(10)
["min_store_time"]=>
int(8)
["max_store_time"]=>
int(13)
}
}
参见
Runtime configuration mysqlnd_qc.collect_normalized_query_trace mysqlnd_qc.time_statistics mysqlnd_qc_get_query_trace_log() - Returns a backtrace for each query inspected by the query cache
User Contributed Notes
There are no user contributed notes for this page.官方地址：https://www.php.net/manual/en/function.mysqlnd-qc-get-normalized-query-trace-log.php