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I use JDBC to connect to MySQL. When it’s at localhost:3306, everything is OK.
But when I move my application to another computer in the intranet, and use <Intranet-IP>:3306 to connect to the MySQL database, it takes about 1 minute to connect to MySQL successfully. What’s up with this?
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If your database is being used in high volumes, this can slow the database down. When there are too many queries to process at once, the CPU will bottleneck, resulting in a slow database.
normally means that there is no MySQL server running on the system or that you are using an incorrect Unix socket file name or TCP/IP port number when trying to connect to the server. You should also check that the TCP/IP port you are using has not been blocked by a firewall or port blocking service.
If you suspect that its a MySQL query, try inspecting the MySQL Slow Query Log. The log will help you identify queries that take long time to execute. You can then copy-paste the query text into a MySQL query session, execute it and observe the CPU usage.
Well it could be a DNS problem. You can disable DNS host name lookups by starting mysqld with the --skip-name-resolve option in the configuration file.
Read here for more details: http://dev.mysql.com/doc/refman/5.0/en/host-cache.html
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