mysql> use information_schema
Reading table information for completion of table and column names
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Database changed

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當切換到某個庫時，經常會出現上面信息，意思是預讀這個庫中表以及表列信息。

但是當庫中表很多，表中數據很大時，就會出現執行use <庫名>后半天沒反應，連接很慢的情況

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解決辦法：

上面其實已經有提示了（You can turn off this feature to get a quicker startup with -A）

就是在登陸連接mysql時使用-A參數，這樣就不會預讀庫中表信息了，能提高連接庫的速度.

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shell>?mysql -h hostname -u username -P port -p -A

Enter password:

MySQL -A參數含義：

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.

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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

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shell>?mysql -h?127.0.0.1 -u?root -P?3306 -p

Enter password:

mysql> use information_schema;
Database changed

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總結

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