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The ability to lock and unlock user accounts is a very useful feature. For example, when employees leave a company, you may want to prevent them from being able to access your applications and systems. You may have problems deleting their accounts if their usernames (or other surrogate keys) are being used as foreign keys from other tables, such as an audit trail. An easier solution is to introduce an attribute to the account record that indicates whether it is locked. If an account is locked, the user will not be able to authenticate using that account. You can add an extra column to the user_repository table, which will be a flag indicating the locked status. A value of Y indicates locked, and a value of N indicates that the account is not locked (and therefore the user is allowed to authenticate with it). Listing 3-15 shows the modifications. Listing 3-15. Adding the locked_flag and Constraint to the user_repository Table -- add the new columnn to the table apexdemo@10gR2> alter table user_repository 2 add(locked_flag char(1)); Table altered. -- set one record to be a locked status apexdemo@10gR2> update user_repository set locked_flag = 'Y' 2 where username = 'john';

In this chapter, we discussed two very important XP topics: the team and the environment. We covered the roles and responsibilities of the entire XP team. We highlighted the characteristics of the important XP roles of the development coach and business coach. Then we looked at the best order in which to assemble your XP team. Finally, we took a look at an effective XP working environment for that team. In the next chapter, we are going to take a look at release planning, the place where you and your team s XP adventure will begin.

Health Monitoring Services offers two monitoring types: Robust Health Monitoring and the Simple Server Status. In robust health monitoring, several server parameters can be managed, including the following: Memory usage Type of operating system Processes and threads Network CPU utilization

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1 row updated. -- set all the other records to unlocked apexdemo@10gR2> update user_repository set locked_flag = 'N' 2 where locked_flag is null; 2 rows updated. apexdemo@10gR2> commit; -- add a not null constraint to the column apexdemo@10gR2> alter table user_repository 2 modify locked_flag not null; Table altered. -- add a check constraint to ensure that the locked_flag is either 'Y' or 'N' apexdemo@10gR2> alter table user_repository add constraint 2 locked_flag_yn check (locked_flag in ('Y','N')); Table altered. apexdemo@10gR2> select username, locked_flag from user_repository; USERNAME -------john peterw jimb LOCKED_FLAG --------------Y N N

Robust Health Monitoring is only available when the owcimomd module is running on the server you want to monitor. By default, this module is started as a part of the OpenWBEM architecture on both versions of OES. You must be authenticated to the server you wish to monitor in order to see its health status, or if you want to modify settings on the server. The second option is Simple Server Status Monitoring. With this option, the monitoring utility checks whether the server is up and running, based upon a connection attempt on a number of standard ports. If a server can be reached on any of these ports, the server is considered to be up. In the current release, these ports are hard-coded and cannot be modified. The way these ports are used by the Server Health Monitoring utility is covered in the section Server Health Monitoring later in this chapter. The following ports are monitored: 7 (Echo) 13 (Time) 20 (FTP) 22 (SSH) 23 (Telnet) 80 (HTTP) 135 (DCE endpoint resolution) 443 (Secure HTTP) 445 (Microsoft Directory Services) 524 (NCP, eDirectory) In order to perform simple monitoring, you should take care that no firewall is currently blocking these ports.

You can now modify the authentication function to take the value in the locked_flag column into account when deciding whether to allow the user to authenticate. The simplest case would be to just include an additional where clause restriction in the query to search for a record where the username and password hash match and the account is not locked, like this: select 1 into v_result from user_repository where upper(username) = upper( p_username) and upper(password_hash) = v_hash and locked_flag = 'N' You will now find that if you attempt to authenticate to the application with a username that has the locked_flag set to 'Y' (or more correctly it isn t set to 'N'), you will not be able to log in.

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