请教一个mysql数据库恢复后的问题

刚刚对数据库中的数据进行了恢复，后来进入数据库后， 使用use命令选取数据库的时候会出现一段提示：
mysql> use thinksns
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> use www
No connection. Trying to reconnect...
Connection id:    14467
Current database: *** NONE ***

Database changed
mysql> use keyi
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql>

请问： Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
这段语句是什么意思？

问题补充下：数据库使用正常，想问下如何设置，把这段提示清楚呢？