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The purpose of a push interaction is for one party to deliver information and/or execution control to another. I ll use the word talker to designate the party starting the interaction, and the word listener for the party with whom the talker interacts. In a push interaction, the talker sends a command to the listener, as shown in Figure 9-1.

NOT NULL NUMBER VARCHAR2(30) NOT NULL VARCHAR2(32) DATE DATE NOT NULL VARCHAR2(30) NOT NULL VARCHAR2(30) NOT NULL DATE NOT NULL VARCHAR2(30) VARCHAR2(30) VARCHAR2(4000)

You can use the DBA_USERS view to find out the profile, temporary tablespace, or default tablespace assigned to users. Although there s a PASSWORD column, you can t find out the password, because the password is encrypted. There are two ways you can log in as a user if you don t know the user s password. First, you can simply change the user s password by using the ALTER USER command. However, this permanently changes the user s password, which may not be what you want to do. The following example shows the other way to log in as a different user without knowing that user s password. (In this case, the user is called hr. ) First, find out the encrypted version of hr s password: SQL> SELECT password FROM DBA_USERS 2 WHERE username='HR'; PASSWORD -----------------------------4C6D73C3E8B0F0DA SQL> Second, alter hr s password: SQL> ALTER USER hr IDENTIFIED BY new_pass; User altered. SQL> Third, when you re done using hr s username and you want to change the password to its original (unknown) version, use the following statement: SQL> ALTER USER hr IDENTIFIED BY VALUES '4C6D73C3E8B0F0DA'; User altered.

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Just as there are two ways to manage PGA memory, there are two ways to manage SGA memory starting in Oracle 10g: manually, by setting all of the necessary pool and cache parameters:

The DBA_PROFILES view provides information about user profiles. You ll find out that this view is one of your most important aids in managing user resource allocation. Two important values under the RESOURCE_TYPE column are KERNEL and PASSWORD. Here s the structure of this view: SQL> DESC DBA_PROFILES Name ----------------------------------------PROFILE RESOURCE_NAME RESOURCE_TYPE LIMIT SQL> Null -------NOT NULL NOT NULL Type ------------VARCHAR2(30) VARCHAR2(32) VARCHAR2(8) VARCHAR2(40)

Figure 9-1. The push-interaction pattern A command can include data. A push interaction is an imperative interaction. Push interactions are effective when the following two things apply: 1. The talker acts as a controller of the listener. 2. The talker decides when to issue commands to the listener. Push interactions form the basis of event-driven systems. Publishers are talkers, and subscribers are listeners. When something occurs to the publisher, notifications are sent to available subscribers to inform them of the event. Using push interactions to propagate changes through a system is particularly efficient when the talker needs to send the same command to a large number of listeners. If you have to implement the system without using push interactions, the alternative would require each listener to poll the talker periodically, waiting for changes to occur. A significant amount of processing time would be wasted in polling loops. Using a push interaction pattern frees the listeners from devoting resources to monitor the talker. While the talker has no new data, the listener can use its own resources to do more useful things than sitting in a polling loop. Due to their efficiency, push interactions are a good solution in real-time systems. When changes occur at very high speed, you might use a single notification to describe multiple changes at once. There are numerous examples of the push pattern in everyday life and in computing.

The following simple example shows how you can query the DBA_PROFILES view to find out what a user s password profile looks like. Listing 23-6 shows the results of the query. Listing 23-6. Querying the DBA_PROFILES View SQL> 2 3 4 5 6* SELECT resource_name,limit FROM DBA_PROFILES p, dba_users u WHERE p.profile=u.profile AND u.username='HR' AND p.resource_type='PASSWORD';

and automatically, by setting just a few memory parameters and a single SGA_TARGET parameter. By setting the SGA_TARGET parameter, you are allowing the instance to size and resize various SGA components.

RESOURCE_NAME LIMIT ----------------------------------- ------FAILED_LOGIN_ATTEMPTS UNLIMITED PASSWORD_LIFE_TIME UNLIMITED PASSWORD_REUSE_TIME UNLIMITED PASSWORD_REUSE_MAX UNLIMITED PASSWORD_VERIFY_FUNCTION NULL PASSWORD_LOCK_TIME UNLIMITED PASSWORD_GRACE_TIME UNLIMITED 7 rows selected. SQL>

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