【MySQL】Can't get stat of './mysql/slow_log.CSV' (Errcode: 2)

楊奇龍發表於2012-08-24
MySql
在給資料庫開啟慢日誌查詢的時候遇到 如下問題
root@rac1 : (none) 23:39:53> set global slow_query_log = 1;
ERROR 13 (HY000): Can't get stat of './mysql/slow_log.CSV' (Errcode: 2)
原因是因為資料庫中沒有slow_log表對應的物理檔案，解決的方法有如下兩種：
方法一 手工建立slow_log.CSV
[root@rac1 mysql]# touch slow_log.CSV
[root@rac1 mysql]# chown -R mysql:mysql slow_log.CSV
[root@rac1 mysql]# chmod 660 slow_log.CSV
root@rac1 : (none) 23:42:36>set global slow_query_log = 1;
Query OK, 0 rows affected, 1 warning (0.17 sec)
root@rac1 : (none) 23:43:03>show warnings;
+-------+------+--------------------------------------------------------------+
| Level | Code | Message                                                      |
+-------+------+--------------------------------------------------------------+
| Error | 1194 | Table 'slow_log' is marked as crashed and should be repaired | 
+-------+------+--------------------------------------------------------------+
1 row in set (0.00 sec)
root@rac1 : (none) 23:48:03>repair table mysql.slow_log;
+----------------+--------+----------+----------+
| Table          | Op     | Msg_type | Msg_text |
+----------------+--------+----------+----------+
| mysql.slow_log | repair | status   | OK       | 
+----------------+--------+----------+----------+
1 row in set (0.61 sec)
root@rac1 : (none) 23:51:03>set global slow_query_log = 1;
Query OK, 0 rows affected (0.00 sec)
方法二 在資料庫中以重建表的方式 (個人比較推薦第二種方式)
[root@rac1 ~]# mysql
root@rac1 : (none) 21:47:46> 
root@rac1 : (none) 21:47:47> show global variables like '%slow%';
+---------------------+----------------+
| Variable_name       | Value          |
+---------------------+----------------+
| log_slow_queries    | ON             |
| slow_launch_time    | 2              |
| slow_query_log      | ON             |
| slow_query_log_file | slow_query.log |
+---------------------+----------------+
4 rows in set (0.06 sec)
root@rac1 : (none) 21:48:19> set global slow_query_log=off;
Query OK, 0 rows affected (0.00 sec)
root@rac1 : (none) 21:48:47> 
root@rac1 : (none) 21:48:47> show global variables like '%slow%';
+---------------------+----------------+
| Variable_name       | Value          |
+---------------------+----------------+
| log_slow_queries    | OFF            |
| slow_launch_time    | 2              |
| slow_query_log      | OFF            |
| slow_query_log_file | slow_query.log |
+---------------------+----------------+
4 rows in set (0.01 sec)
root@rac1 : (none) 21:48:49> show global variables like '%slow%';
+---------------------+----------------+
| Variable_name       | Value          |
+---------------------+----------------+
| log_slow_queries    | OFF            |
| slow_launch_time    | 2              |
| slow_query_log      | OFF            |
| slow_query_log_file | slow_query.log |
+---------------------+----------------+
4 rows in set (0.00 sec)

root@rac1 : (none) 21:49:50> set global slow_query_log=on;
ERROR 13 (HY000): Can't get stat of './mysql/slow_log.CSV' (Errcode: 2)
root@rac1 : mysql 21:50:33> show create table slow_log;
ERROR 13 (HY000): Can't get stat of './mysql/slow_log.CSV' (Errcode: 2)
從一個有slow_log 的資料庫中檢視slow_log的表建立ddl 語句，進行建立！
root@rac1 : mysql 21:51:23> CREATE TABLE `slow_log` (
    ->   `start_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    ->   `user_host` mediumtext NOT NULL,
    ->   `query_time` time NOT NULL,
    ->   `lock_time` time NOT NULL,
    ->   `rows_sent` int(11) NOT NULL,
    ->   `rows_examined` int(11) NOT NULL,
    ->   `db` varchar(512) NOT NULL,
    ->   `last_insert_id` int(11) NOT NULL,
    ->   `insert_id` int(11) NOT NULL,
    ->   `server_id` int(10) unsigned NOT NULL,
    ->   `sql_text` mediumtext NOT NULL
    -> ) ENGINE=MyISAM DEFAULT CHARSET=utf8 COMMENT='Slow log';
Query OK, 0 rows affected (0.04 sec)
root@rac1 : mysql 21:51:43> 
root@rac1 : mysql 21:51:55> set global slow_query_log=on;
Query OK, 0 rows affected (0.00 sec)
root@rac1 : mysql 21:52:13> 
root@rac1 : mysql 21:52:13> show global variables like '%out%'; 
+----------------------------+----------+
| Variable_name              | Value    |
+----------------------------+----------+
| log_output                 | FILE     |
+----------------------------+----------+
11 rows in set (0.00 sec)

root@rac1 : mysql 21:52:20> set global log_output = 'TABLE';
Query OK, 0 rows affected (0.00 sec)
root@rac1 : mysql 21:52:41> show global variables like '%out%'; 
+----------------------------+----------+
| Variable_name              | Value    |
+----------------------------+----------+
| log_output                 | TABLE    |
+----------------------------+----------+
11 rows in set (0.00 sec)
如果log_output 用TABLE形式記錄日誌，mysql會以表的形式將slow_log存入mysql表中的slow_log表中。
root@rac1 : mysql 21:52:43> select sleep(60);
+-----------+
| sleep(60) |
+-----------+
|         0 |
+-----------+
1 row in set (1 min 0.00 sec)
root@rac1 : mysql 21:54:01> select * from slow_log \G
*************************** 1. row ***************************
    start_time: 2012-08-24 21:54:01
     user_host: root[root] @ localhost [127.0.0.1]
    query_time: 00:01:00
     lock_time: 00:00:00
     rows_sent: 1
 rows_examined: 0
            db: mysql
last_insert_id: 0
     insert_id: 0
     server_id: 1
      sql_text: select sleep(60)
1 row in set (0.00 sec)
root@rac1 : mysql 21:57:53> 
root@rac1 : mysql 21:58:25> set global log_output = 'FILE';     
Query OK, 0 rows affected (0.00 sec)
root@rac1 : mysql 21:58:30> select sleep(10);                   
+-----------+
| sleep(10) |
+-----------+
|         0 |
+-----------+
1 row in set (10.00 sec)
由於log_output 用FILE形式記錄日誌，所以我們在vim  /home/mysql/log/mysql-slow.log 將會看到執行超過0秒的所有的sql
-bash-3.2$ tail -f slow_query.log
Tcp port: 3306  Unix socket: /tmp/mysql.sock
Time                 Id Command    Argument
# Time: 120824 21:58:48
# User@Host: root[root] @ localhost [127.0.0.1]
# Query_time: 10.001827  Lock_time: 0.000000 Rows_sent: 1  Rows_examined: 0
use mysql;
SET timestamp=1345816728;
select sleep(10);
至此問題完全得到解決。

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