mysqldump之不老将

–add-drop-database 每个数据库创建之前添加drop数据库语句。mysqldump -uroot -p –all-databases –add-drop-database

–add-drop-table       每个数据表创建之前添加drop数据表语句。(默认为打开状态，使用--skip-add-drop-table取消选项)

--no-create-info       导出sql文件时使用该参数会跳过 create table 语句

--compact  优化输出内容的大小，让容量更少，适合调试。默认开启以下几个标红的参数，配合--no-create-info，则导出的只有INERT语句了。

  --compact           Give less verbose output (useful for debugging). Disables
                      structure comments and header/footer constructs.  Enables
                      options --skip-add-drop-table --skip-add-locks
                      --skip-comments --skip-disable-keys --skip-set-charset.

---

mysqladmin  -uroot  -r -i 1   status/processlist/debug 

1. 使用-r/-i参数

使用mysqladmin extended-status命令可以获得所有MySQL性能指标，即show global status的输出，不过，因为多数这些指标都是累计值，如果想了解当前的状态，则需要进行一次差值计算，这就是mysqladmin extended-status的一个额外功能，非常实用。默认的，使用extended-status，看到也是累计值，但是，加上参数-r(--relative)，就可以看到各个指标的差值，配合参数-i(--sleep)就可以指定刷新的频率，那么就有如下命令：

mysqladmin -uroot -r -i  -pxxx extended-status
+------------------------------------------+----------------------+
| Variable_name                            | Value                |
+------------------------------------------+----------------------+
| Aborted_clients                          |                     |
| Com_select                               |                   |
| Com_insert                               |                   |
......
| Threads_created                          |                     |
+------------------------------------------+----------------------+

2. 配合grep使用

配合grep使用，我们就有：

mysqladmin -uroot -r -i  -pxxx extended-status \
|grep "Questions\|Queries\|Innodb_rows\|Com_select \|Com_insert \|Com_update \|Com_delete "
| Com_delete                               |                     |
| Com_delete_multi                         |                     |
| Com_insert                               |                   |
| Com_select                               |                   |
| Com_update                               |                    |
| Innodb_rows_deleted                      |                     |
| Innodb_rows_inserted                     |                   |
| Innodb_rows_read                         |                  |
| Innodb_rows_updated                      |                    |
| Queries                                  |                  |
| Questions                                |                  |

3. 配合简单的awk使用

使用awk，同时输出时间信息：

mysqladmin -uroot -p -h127.0.0. -P3306 -r -i  ext |\
awk -F"|" '{\
  if($ ~ /Variable_name/){\
    print " <-------------    "  strftime("%H:%M:%S") "    ------------->";\
  }\
  if($ ~ /Questions|Queries|Innodb_rows|Com_select |Com_insert |Com_update |Com_delete |Innodb_buffer_pool_read_requests/)\
    print $ $;\
}'
<-------------    ::    ------------->
 Com_delete
 Com_insert
 Com_select
 Com_update
 Innodb_buffer_pool_read_requests
 Innodb_rows_deleted
 Innodb_rows_inserted
 Innodb_rows_read
 Innodb_rows_updated
 Queries
 Questions
 <-------------    ::    ------------->
 Com_delete
 Com_insert
 Com_select
 Com_update
 Innodb_buffer_pool_read_requests
 Innodb_rows_deleted
 Innodb_rows_inserted
 Innodb_rows_read
 Innodb_rows_updated
 Queries
 Questions                              

4. 配合复杂一点的awk

反正也不简单了，那就更复杂一点，这样让输出结果更友好点，因为awk不支持动态变量，所以代码看起来比较复杂：

mysqladmin -P3306 -uroot -p -h127.0.0. -r -i  ext |\
awk -F"|" \
"BEGIN{ count=0; }"\
'{ if($2 ~ /Variable_name/ && ((++count)%20 == 1)){\
    print "----------|---------|--- MySQL Command Status --|----- Innodb row operation ----|-- Buffer Pool Read --";\
    print "---Time---|---QPS---|select insert update delete|  read inserted updated deleted|   logical    physical";\
}\
else if ($ ~ /Queries/){queries=$;}\
else if ($ ~ /Com_select /){com_select=$;}\
else if ($ ~ /Com_insert /){com_insert=$;}\
else if ($ ~ /Com_update /){com_update=$;}\
else if ($ ~ /Com_delete /){com_delete=$;}\
else if ($ ~ /Innodb_rows_read/){innodb_rows_read=$;}\
else if ($ ~ /Innodb_rows_deleted/){innodb_rows_deleted=$;}\
else if ($ ~ /Innodb_rows_inserted/){innodb_rows_inserted=$;}\
else if ($ ~ /Innodb_rows_updated/){innodb_rows_updated=$;}\
else if ($ ~ /Innodb_buffer_pool_read_requests/){innodb_lor=$;}\
else if ($ ~ /Innodb_buffer_pool_reads/){innodb_phr=$;}\
else if ($ ~ /Uptime / && count >= ){\
  printf(" %s |%9d",strftime("%H:%M:%S"),queries);\
  printf("|%6d %6d %6d %6d",com_select,com_insert,com_update,com_delete);\
  printf("|%6d %8d %7d %7d",innodb_rows_read,innodb_rows_inserted,innodb_rows_updated,innodb_rows_deleted);\
  printf("|%10d %11d\n",innodb_lor,innodb_phr);\
}}'

----------|---------|--- MySQL Command Status --|----- Innodb row operation ----|-- Buffer Pool Read --
---Time---|---QPS---|select insert update delete|  read inserted updated deleted|   logical    physical
 :: |     |                  |                     |
 :: |     |                 |                    |
 :: |     |                  |                     |
 :: |     |                  |                     |
 :: |     |                  |                     |
 :: |     |                 |                    |
 :: |     |                  |                     |
 :: |     |                  |                     |