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mysql> show status like "open_files";
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| Open_files | 59436 |
+---------------+-------+
1 row in set (0.00 sec)
(select * from tbl where id = 1) UNION (select * from tbl where id = 2) UNION (select * from tbl where id = 3) UNION (select * from tbl where id = 4) UNION (select * from tbl where id = 5);
执行后,open_files增加了,lsof相关的表会有5条