MYSQLND_QC_GET_NORMALIZED_QUERY_TRACE_LOG(3) 1 MYSQLND_QC_GET_NORMALIZED_QUERY_TRACE_LOG(3)
mysqlnd_qc_get_normalized_query_trace_log - Returns a normalized query trace log for each query inspected by the query cache
SYNOPSIS
array mysqlnd_qc_get_normalized_query_trace_log (void )
DESCRIPTION
Returns 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.
PARAMETERS
This function has no parameters.
RETURN VALUES
An array of query log. Every list entry contains the normalized query stringand further detail information.
+---------------------+---------------------------------------------------+
| Key | |
| | |
| | Description |
| | |
+---------------------+---------------------------------------------------+
| | |
| query | |
| | |
| | Normalized statement string. |
| | |
| | |
| occurences | |
| | |
| | How many statements have matched the normalized |
| | statement string in addition to the one which has |
| | created the log entry. The value is zero if a |
| | statement has been normalized, its normalized |
| | representation has been added to the log but no |
| | further queries inspected by PECL/mysqlnd_qc have |
| | the same normalized statement string. |
| | |
| | |
|eligible_for_caching | |
| | |
| | Whether the statement could be cached. An state- |
| | ment eligible for caching has not necessarily |
| | been cached. It not possible to tell for sure if |
| | or how many cached statement have contributed to |
| | the aggregated normalized statement log entry. |
| | However, comparing the minimum and average run |
| | time one can make an educated guess. |
| | |
| | |
| avg_run_time | |
| | |
| | The average run time of all queries contributing |
| | to the query log entry. The run time is the time |
| | between sending the query statement to MySQL and |
| | receiving an answer from MySQL. |
| | |
| | |
| avg_store_time | |
| | |
| | The average store time of all queries contribut- |
| | ing to the query log entry. The store time is the |
| | time needed to fetch a statements result set from |
| | the server to the client and, storing it on the |
| | client. |
| | |
| | |
| min_run_time | |
| | |
| | The minimum run time of all queries contributing |
| | to the query log entry. |
| | |
| | |
| min_store_time | |
| | |
| | The minimum store time of all queries contribut- |
| | ing to the query log entry. |
| | |
| | |
| max_run_time | |
| | |
| | The maximum run time of all queries contributing |
| | to the query log entry. |
| | |
| | |
| max_store_time | |
| | |
| | The maximum store time of all queries contribut- |
| | ing to the query log entry. |
| | |
+---------------------+---------------------------------------------------+
EXAMPLES
Example #1
mysqlnd_qc_get_normalized_query_trace_log(3) 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());
?>
The above examples will output:
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)
}
}
SEE ALSO
Runtime configuration, mysqlnd_qc.collect_normalized_query_trace, mysqlnd_qc.time_statistics, mysqlnd_qc_get_query_trace_log(3).
PHP Documentation Group MYSQLND_QC_GET_NORMALIZED_QUERY_TRACE_LOG(3)