MySQL之高階命令使用介紹
阿新 • • 發佈：2018-12-04
一、mysql之高階命令Pager使用
分屏顯示內容：
[email protected] [(none)]>pager more PAGER set to 'more' [email protected] [(none)]>select * from testdb.zx_scores; [email protected] [(none)]>pager less PAGER set to 'less' [email protected] [(none)]> [email protected] [(none)]>select * from testdb.zx_scores;
結果中搜索：
[email protected] [(none)]>pager grep Sleep|wc -l;
PAGER set to 'grep Sleep|wc -l'
[email protected] [(none)]>show full processlist;
0
7 rows in set (0.00 sec)
[email protected] [(none)]>不顯示查詢出來結果：
[email protected] [(none)]>pager cat >>/dev/null PAGER set to 'cat >>/dev/null'[email protected] [(none)]>select * from information_schema.tables; 282 rows in set, 48 warnings (0.04 sec) [email protected] [(none)]>select * from testdb.zx_scores; 33 rows in set (0.01 sec) [email protected] [(none)]>nopager PAGER set to stdout [email protected] [(none)]>select count(*) from testdb.zx_scores; +----------+ | count(*) | +----------+ | 33 | +----------+ 1 row in set (0.00 sec)
結果用md5sum比較：
[email protected] [(none)]>pager md5sum
PAGER set to 'md5sum'
[email protected] [(none)]>select * from information_schema.tables;
f3e004ca08069e1b4536d175f8373583 -
282 rows in set, 48 warnings (0.05 sec)恢復 pager：
[email protected] [(none)]>pager 或是 [email protected] [(none)]>nopager二、記錄MySQL輸入的命令及結果
使用tee命令或是在配置檔案配置，演示如下：
[email protected] [(none)]>tee /tmp/mysql.log
Logging to file '/tmp/mysql.log'
[email protected] [(none)]>select count(*) from testdb.zx_scores;
+----------+
| count(*) |
+----------+
| 33 |
+----------+
1 row in set (0.00 sec)[[email protected] ~]# tailf /tmp/mysql.log
[email protected] [(none)]>select count(*) from testdb.zx_scores;
+----------+
| count(*) |
+----------+
| 33 |
+----------+
1 row in set (0.00 sec)
[email protected] [(none)]>select count(*) from testdb.zx_scores;
+----------+
| count(*) |
+----------+
| 33 |
+----------+
1 row in set (0.00 sec)另外也可以通過在配置檔案中，加如下這個配置 ：
[mysql]
tee=/tmp/mysql.log再次登入即可 （前提這個配置檔案是可以被mysql讀到的）
三、MySQL呼叫系統命令
該功能只能Linux平臺支援，利用system後面跟命令呼叫
[email protected] [(none)]>system ls
[email protected] [(none)]>system top
[email protected] [(none)]>system ps -eostart,cmd,pid|grep mysqld
Nov 26 /usr/local/mysql/bin/mysqld 2798
18:06:15 grep mysqld 9247
[email protected] [(none)]>
[email protected] [(none)]>system ps -ef|grep mysqld
root 1023 1 0 11月26 ? 00:00:00 /bin/sh /usr/local/mysql//bin/mysqld_safe --datadir=/data/mysql/data --pid-file=/data/mysql/data/localhost.localdomain.pid
mysql 2798 1023 0 11月26 ? 00:07:41 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql/ --datadir=/data/mysql/data --plugin-dir=/usr/local/mysql//lib/plugin --user=mysql --log-error=/data/mysql/logs/error.log --open-files-limit=65536 --pid-file=/data/mysql/data/localhost.localdomain.pid --socket=/tmp/mysql.sock --port=3306
root 9248 9194 0 18:06 pts/0 00:00:00 sh -c ps -ef|grep mysqld
root 9250 9248 0 18:06 pts/0 00:00:00 grep mysqld
[email protected] [(none)]>歡迎大家一起交流學習，如果有其他的高階的命令，希望大家可以分享下，一起探討，共同進步