Shantanu's Blog

Corporate Consultant

August 10, 2010

 

skip name resolve and connect to IP address

1) Connect to IP address:
While connecting to MySQL from PHP application, do you connect to IP address or the named server?
Using IP addresses is better since it allows fast connection by avoiding name lookup and the IP can be assigned to another machine for e.g. slave in case of Master disaster.

There are 2 ways of granting access to the database. One is allow an IP address to log-in or a host name to access the database.

grant all on *.* to 'redhat'@'10.0.2.143' identified by 'SecRet';
grant all on *.* to 'redhat'@'mysite.net' identified by 'SecRet';

The first method mentioned above is very popular and it's versatile as well. For e.g. I can use wildcard 192.168.% to allow access from all the machines of the network. The second method involves a lookup of hostname and this extra step takes time. There are times when the DNS server is down and mysql goes down as well for no fault of itself. The people can not figure out the reason.

a) Use only IP "numbers" in the grant statement. Do not use hostname "text".
b) use skip-name-resolve line in the my.cnf so that mysql will allow quick connections.

I have experienced as much as 15% improvement in overall performance and less frequent downtime.

2) Super level permissions:
The user connecting to mysql can have specific table / DB level access or super level access that is equivalent to "root". For security reasons a user with limited access is used, but user with super level access is faster to connect.

If you are using super user to connect to IP address then adding the following 2 parameters in my.cnf will improve the mysql connection time by 20-25%

skip-name-resolve
read-only

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