Setting Advanced User Properties

Max queries per hour, Max updates per hour and Max connections per hour
These options limit the number of queries, updates, and logins a user can perform during any given one-hour period. If they are set as 0 (the default), this means that there is no limitation for that user.

Max user connections
This option limits the maximum number of simultaneous connections that the account can make. If it is set as 0 (the default), the max_user_connections system variable determines the number of simultaneous connections for the account.

Use OLD_PASSWORD encryption
The password hashing mechanism was updated in MySQL 4.1 to provide better security and to reduce the risk of passwords being intercepted. However, this new mechanism is understood only by MySQL 4.1 (and newer) servers and clients, which can result in some compatibility problems. A 4.1 or newer client can connect to a pre-4.1 server, because the client understands both the old and new password hashing mechanisms. However, a pre-4.1 client that attempts to connect to a 4.1 or newer server may run into difficulties.

Enable this option if you wish to maintain backward compatibility with pre-4.1 clients under circumstances where the server would otherwise generate long password hashes. The option does not affect authentication (4.1 and later clients can still use accounts that have long password hashes), but it does prevent creation of a long password hash in the user table as the result of a password-changing operation.