use database 很慢/You can turn off this feature to get a quicker startup with –A
mysql> use information_schemaReading table information for completion of table and column namesYou can turn off this feature to get a quicker startup with -ADatabase changed 当切换到某个库时,经常会出现上面
mysql> use information_schema
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
当切换到某个库时,经常会出现上面信息,意思是预读这个库中表以及表列信息。
但是当库中表很多,表中数据很大时,就会出现执行use <库名>后半天没反应,连接很慢的情况
解决办法:
上面其实已经有提示了(You can turn off this feature to get a quicker startup with -A)
就是在登陆连接mysql时使用-A参数,这样就不会预读库中表信息了,能提高连接库的速度.
shell> mysql -h hostname -u username -P port -p -A
Enter password:
MySQL -A参数含义:
shell> mysql --help
-A, --no-auto-rehash
No automatic rehashing. One has to use 'rehash' to get table and field completion.
This gives a quicker start of mysql and disables rehashing on reconnect.
例子:
shell> mysql -h 127.0.0.1 -u root -P 3306 -p
Enter password:
mysql> use information_schema;
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> exit
Bye
shell> mysql -h 127.0.0.1 -u root -P 3306 -p
Enter password:
mysql> use information_schema;
Database changed
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