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mysql> SELECT @@profiling;
+-------------+
| @@profiling |
+-------------+
| 0 |
+-------------+
1 row in set (0.00 sec)
mysql> SET profiling = 1;
Query OK, 0 rows affected (0.00 sec)
mysql> SELECT @@profiling;
+-------------+
| @@profiling |
+-------------+
| 1 |
+-------------+
1 row in set (0.00 sec)
ĬÈÏÇé¿öÏ profiling µÄֵΪ 0 ±íʾ MySQL SQL Profiler ´¦ÓÚ OFF ״̬£¬¿ªÆô SQL ÐÔÄÜ·ÖÎöÆ÷ºó profiling µÄֵΪ 1.
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mysql> create table t_engines select * from t_engines1;
Query OK, 57344 rows affected (0.10 sec)
Records: 57344 Duplicates: 0 Warnings: 0
mysql> select count(*) from t_engines;
+----------+
| count(*) |
+----------+
| 57344 |
+----------+
1 row in set (0.00 sec)
mysql> select count(*) from t_engines;
+----------+
| count(*) |
+----------+
| 57344 |
+----------+
1 row in set (0.00 sec)
mysql> SHOW PROFILES;
+----------+------------+-------------------------------------------------+
| Query_ID | Duration | Query |
+----------+------------+-------------------------------------------------+
| 26 | 0.
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