求mysql执行时间的语句。。。

直接用命令行工具，显示如下。mysql> select * from a;
+------+------+
| id   | name |
+------+------+
|    1 | A    |
|    2 | B    |
|    3 | C    |
|    4 | D    |
|    5 | E    |
|    6 | A    |
|    7 | B    |
|    8 | C    |
|    9 | D    |
|   10 | E    |
+------+------+
10 rows in set (0.03 sec)mysql>

set profiling=1
select * from tb
show profiles

1楼2楼的方法我都试过了我要的是有个查询可以1条sql，也可以2条2sql现在要得出哪个快
（我肯定得做多次执行来得出，不能就执行一次说哪个快哪个慢，
另外我肯定要用不同数据量，
不同的索引来测试的，
现在问题是简单的测试都不知道怎么做啊，以上的方法都不能记录下这些数值）

那就自己写个脚本select now() as beginetime;
select ........
select now() as endTime使用MYSQL行命令批处理这些语句，并发结果重定向到文件

大哥mysql怎么重定向输出啊！

Mysql的SQL语句执行时间
查看 MySQL 語法詳細執行時間與 CPU/記憶體使用量: MySQL Query ProfilerMySQL 的 SQL 語法調整主要都是使用 EXPLAIN , 但是這個並沒辦法知道詳細的 Ram(Memory)/CPU 等使用量.於 MySQL 5.0.37 以上開始支援 MySQL Query Profiler, 可以查詢到此 SQL 會執行多少時間, 並看出 CPU/Memory 使用量, 執行過程中 System lock, Table lock 花多少時間等等.MySQL Query Profile 詳細介紹可見: Using the New MySQL Query Profiler (2007.04.05 發表)效能分析主要分下述三種(轉載自上篇):    * Bottleneck analysis - focuses on answering the questions: What is my database server waiting on; what is a user connection waiting on; what is a piece of SQL code waiting on?
    * Workload analysis - examines the server and who is logged on to determine the resource usage and activity of each.
    * Ratio-based analysis - utilizes a number of rule-of-thumb ratios to gauge performance of a database, user connection, or piece of code.MySQL Query Profile 使用方法
啟動    * mysql> set profiling=1; # 此命令於 MySQL 會於 information_schema 的 database 建立一個 PROFILING 的 table 來紀錄.SQL profiles show    * mysql> show profiles; # 從啟動之後所有語法及使用時間, 含錯誤語法都會紀錄.
    * ex: (root@localhost) [test]> show profiles; # 注意 Query_ID, 下面執行時間統計等, 都是依 Query_ID 在紀錄       +----------+------------+---------------------------+
       | Query_ID | Duration   | Query                     |
       +----------+------------+---------------------------+
       |        1 | 0.00090400 | show profile for query 1  |
       |        2 | 0.00008700 | select * from users       |
       |        3 | 0.00183800 | show tables               |
       |        4 | 0.00027600 | mysql> show profiles      |
       +----------+------------+---------------------------+
       查詢所有花費時間加總    * mysql> select sum(duration) from information_schema.profiling where query_id=1; # Query ID = 1       +---------------+
       | sum(duration) |
       +---------------+
       |      0.000447 |
       +---------------+
       查詢各執行階段花費多少時間    * mysql> show profile for query 1; # Query ID = 1       +--------------------+------------+
       | Status             | Duration   |
       +--------------------+------------+
       | (initialization)   | 0.00006300 |
       | Opening tables     | 0.00001400 |
       | System lock        | 0.00000600 |
       | Table lock         | 0.00001000 |
       | init               | 0.00002200 |
       | optimizing         | 0.00001100 |
       | statistics         | 0.00009300 |
       | preparing          | 0.00001700 |
       | executing          | 0.00000700 |
       | Sending data       | 0.00016800 |
       | end                | 0.00000700 |
       | query end          | 0.00000500 |
       | freeing items      | 0.00001200 |
       | closing tables     | 0.00000800 |
       | logging slow query | 0.00000400 |
       +--------------------+------------+
       查詢各執行階段花費的各種資源列表    * mysql> show profile cpu for query 1; # Query ID = 1       +--------------------------------+----------+----------+------------+
       | Status                         | Duration | CPU_user | CPU_system |
       +--------------------------------+----------+----------+------------+
       | (initialization)               | 0.000007 | 0        | 0          |
       | checking query cache for query | 0.000071 | 0        | 0          |
       | Opening tables                 | 0.000024 | 0        | 0          |
       | System lock                    | 0.000014 | 0        | 0          |
       | Table lock                     | 0.000055 | 0.001    | 0          |
       | init                           | 0.000036 | 0        | 0          |
       | optimizing                     | 0.000013 | 0        | 0          |
       | statistics                     | 0.000021 | 0        | 0          |
       | preparing                      | 0.00002  | 0        | 0          |
       | executing                      | 0.00001  | 0        | 0          |
       | Sending data                   | 0.015072 | 0.011998 | 0          |
       | end                            | 0.000021 | 0        | 0          |
       | query end                      | 0.000011 | 0        | 0          |
       | storing result in query cache  | 0.00001  | 0        | 0          |
       | freeing items                  | 0.000018 | 0        | 0          |
       | closing tables                 | 0.000019 | 0        | 0          |
       | logging slow query             | 0.000009 | 0        | 0          |
       +--------------------------------+----------+----------+------------+
           * mysql> show profile IPC for query 1;       +--------------------------------+----------+---------------+-------------------+
       | Status                         | Duration | Messages_sent | Messages_received |
       +--------------------------------+----------+---------------+-------------------+
       | (initialization)               | 0.000007 |             0 |                 0 |
       | checking query cache for query | 0.000071 |             0 |                 0 |
       | Opening tables                 | 0.000024 |             0 |                 0 |
       | System lock                    | 0.000014 |             0 |                 0 |
       | Table lock                     | 0.000055 |             0 |                 0 |
       | init                           | 0.000036 |             0 |                 0 |
       | optimizing                     | 0.000013 |             0 |                 0 |
       | statistics                     | 0.000021 |             0 |                 0 |
       | preparing                      | 0.00002  |             0 |                 0 |
       | executing                      | 0.00001  |             0 |                 0 |
       | Sending data                   | 0.015072 |             0 |                 0 |
       | end                            | 0.000021 |             0 |                 0 |
       | query end                      | 0.000011 |             0 |                 0 |
       | storing result in query cache  | 0.00001  |             0 |                 0 |
       | freeing items                  | 0.000018 |             0 |                 0 |
       | closing tables                 | 0.000019 |             0 |                 0 |
       | logging slow query             | 0.000009 |             0 |                 0 |
       +--------------------------------+----------+---------------+-------------------+
       其它屬性列表    * ALL - displays all information
    * BLOCK IO - displays counts for block input and output operations
    * CONTEXT SWITCHES - displays counts for voluntary and involuntary context switches
    * IPC - displays counts for messages sent and received
    * MEMORY - is not currently implemented
    * PAGE FAULTS - displays counts for major and minor page faults
    * SOURCE - displays the names of functions from the source code, together with the name and line number of the file in which the function occurs
    * SWAPS - displays swap counts設定 Profiling 存的 Size    * mysql> show variables where variable_name='profiling_history_size'; # 預設是 15筆關閉    * mysql> set profiling=0

mysql> set @start_time:=unix_timestamp();
Query OK, 0 rows affected (0.00 sec)mysql> select 1+1; #这里写您要执行的语句(可以多条用;隔开)
+-----+
| 1+1 |
+-----+
| 2 |
+-----+
1 row in set (0.00 sec)mysql> select sec_to_time(unix_timestamp()-@start_time) as passed_time;
+-------------+
| passed_time |
+-------------+
| 00:01:01 |
+-------------+
1 row in set (0.00 sec)

调试易

求mysql执行时间的语句。。。

解决方案 »