下载 Example Databases ：http://dev.mysql.com/doc/index-other.html sakila-db.zip
mysql> show status like "Com_select"; show status like "Com_insert"; show status like "Com_update"; show status like "Com_delete";
mysql>
mysql> show status like "Innodb_rows_%";
+----------------------+-------+
| Variable_name | Value |
+----------------------+-------+
| Innodb_rows_deleted | 0 |
| Innodb_rows_inserted | 47280 |
| Innodb_rows_read | 62 |
| Innodb_rows_updated | 0 |
+----------------------+-------+
4 rows in set (0.00 sec)
mysql>
mysql> show status like "Connections";show status like "Uptime"; show status like "Slow_%";
mysql> explain select * from customer where customer_id=130;
mysql> select @@have_profiling;
+------------------+
| @@have_profiling |
+------------------+
| YES |
+------------------+
1 row in set, 1 warning (0.00 sec)
mysql>
mysql> select @@profiling;
+-------------+
| @@profiling |
+-------------+
| 0 |
+-------------+
1 row in set, 1 warning (0.00 sec)
mysql> set profiling=1;
Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> select @@profiling;
+-------------+
| @@profiling |
+-------------+
| 1 |
+-------------+
1 row in set, 1 warning (0.00 sec)
mysql>
mysql> select count(*) from payment;
+----------+
| count(*) |
+----------+
| 16049 |
+----------+
1 row in set (0.00 sec)
mysql> show profiles;
+----------+------------+------------------------------+
| Query_ID | Duration | Query |
+----------+------------+------------------------------+
| 1 | 0.00022100 | select @@profiling |
| 2 | 0.00073525 | show tables |
| 3 | 0.00203800 | select count(*) from payment |
+----------+------------+------------------------------+
3 rows in set, 1 warning (0.00 sec)
mysql> show profile for query 3;
+----------------------+----------+
| Status | Duration |
+----------------------+----------+
| starting | 0.000032 |
| checking permissions | 0.000003 |
| Opening tables | 0.000011 |
| init | 0.000007 |
| System lock | 0.000005 |
| optimizing | 0.000007 |
| statistics | 0.000007 |
| preparing | 0.000008 |
| executing | 0.000001 |
| Sending data | 0.001884 |
| end | 0.000003 |
| query end | 0.000003 |
| closing tables | 0.000005 |
| freeing items | 0.000056 |
| cleaning up | 0.000008 |
+----------------------+----------+
15 rows in set, 1 warning (0.00 sec)
mysql>
mysql> show profile all for query 3;
mysql> show profile cpu for query 3;
mysql> create table payment_myisam like payment;
Query OK, 0 rows affected (0.43 sec)
mysql> alter table payment_myisam engine=myisam;
Query OK, 0 rows affected (0.41 sec)
Records: 0 Duplicates: 0 Warnings: 0
mysql> insert into payment_myisam select * from payment;
Query OK, 16049 rows affected, 1 warning (0.05 sec)
Records: 16049 Duplicates: 0 Warnings: 1
mysql>
mysql> select count(*) from payment_myisam;
+----------+
| count(*) |
+----------+
| 16049 |
+----------+
1 row in set (0.00 sec)
mysql> show profiles;
mysql> show profile for query 14;
+----------------------+----------+
| Status | Duration |
+----------------------+----------+
| starting | 0.000083 |
| checking permissions | 0.000011 |
| Opening tables | 0.000028 |
| init | 0.000021 |
| System lock | 0.000017 |
| optimizing | 0.000012 |
| executing | 0.000016 |
| end | 0.000006 |
| query end | 0.000005 |
| closing tables | 0.000065 |
| freeing items | 0.000021 |
| cleaning up | 0.000043 |
+----------------------+----------+
12 rows in set, 1 warning (0.00 sec)
mysql> show profile source for query 14;
+----------------------+----------+-----------------------+------------------+-------------+
| Status | Duration | Source_function | Source_file | Source_line |
+----------------------+----------+-----------------------+------------------+-------------+
| starting | 0.000083 | NULL | NULL | NULL |
| checking permissions | 0.000011 | check_access | sql_parse.cc | 5296 |
| Opening tables | 0.000028 | open_tables | sql_base.cc | 5094 |
| init | 0.000021 | mysql_prepare_select | sql_select.cc | 1051 |
| System lock | 0.000017 | mysql_lock_tables | lock.cc | 304 |
| optimizing | 0.000012 | optimize | sql_optimizer.cc | 138 |
| executing | 0.000016 | exec | sql_executor.cc | 110 |
| end | 0.000006 | mysql_execute_select | sql_select.cc | 1106 |
| query end | 0.000005 | mysql_execute_command | sql_parse.cc | 4995 |
| closing tables | 0.000065 | mysql_execute_command | sql_parse.cc | 5043 |
| freeing items | 0.000021 | mysql_parse | sql_parse.cc | 6432 |
| cleaning up | 0.000043 | dispatch_command | sql_parse.cc | 1777 |
+----------------------+----------+-----------------------+------------------+-------------+
12 rows in set, 1 warning (0.00 sec)
mysql>
原文地址：http://wangqh.blog.51cto.com/5367393/1768953
