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Example 1 Consider the process of getting up one morning at a given time, using a clock One option is to stay awake all night, monitor the clock, and get up at the given time The problem with this polling approach is that it wastes resources when the desired information (the time to get up) isn t available frequently (once every 24 hours) If you want to get up on time by means of a polled interaction with the clock, you would have to stay awake the entire night to watch the time The polling process itself would impede the implementation of an important goal (getting some sleep) The push interaction centralizes the decision of when to consume processing time to send a notification If no information is available, no notifications are ever pushed An alarm clock is just the ticket.

In Oracle 10g, memory-related parameters are classified into one of two areas: Auto-tuned SGA parameters: Currently these are DB_CACHE_SIZE, SHARED_POOL_SIZE, LARGE_POOL_SIZE, and JAVA_POOL_SIZE. Manual SGA parameters: These include LOG_BUFFER, STREAMS_POOL, DB_NK_CACHE_SIZE, DB_KEEP_CACHE_SIZE, and DB_RECYCLE_CACHE_SIZE. At any time in Oracle 10g, you may query V$SGAINFO to see which components of the SGA are resizable.

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The ROLE_ROLE_PRIVS dictionary view shows the roles that have been granted to roles. For example, the DBA role is granted to all database administrator accounts. If you query the ROLE_ROLE_ PRIVS view, you ll see the roles that are granted to you through the DBA role that you already have. Listing 23-7 shows the query s output. Listing 23-7. Querying the ROLE_ROLE_PRIVS View SQL> SELECT granted_role FROM ROLE_ROLE_PRIVS 2 WHERE role='DBA'; GRANTED_ROLE -----------------------OLAP_DBA XDBADMIN JAVA_ADMIN JAVA_DEPLOY WM_ADMIN_ROLE EXP_FULL_DATABASE IMP_FULL_DATABASE DELETE_CATALOG_ROLE SELECT_CATALOG_ROLE EXECUTE_CATALOG_ROLE GATHER_SYSTEM_STATISTICS 11 rows selected. SQL> The DBA_ROLES view only lists all the roles in the database, along with a column stating whether the grantee can grant this role to others or not.

The ROLE_TAB_PRIVS view lists roles and their corresponding table privileges. Here s the structure of the ROLE_TAB_PRIVS view: SQL> DESC ROLE_TAB_PRIVS Name Null Type -------------------------------------ROLE NOT NULL VARCHAR2(30) OWNER NOT NULL VARCHAR2(30) TABLE_NAME NOT NULL VARCHAR2(30) COLUMN_NAME VARCHAR2(30) PRIVILEGE NOT NULL VARCHAR2(40) GRANTABLE VARCHAR2(3) SQL> You can find out the specific table privileges of a user by issuing the query shown in Listing 23-8. Listing 23-8. Querying the ROLE_TAB_PRIVS View SQL> SELECT table_name, privilege 2 FROM ROLE_TAB_PRIVS 3* WHERE role='HR_SELECT'; TABLE_NAME -----------------------------JOBS REGIONS COUNTRIES EMPLOYEES LOCATIONS DEPARTMENTS JOB_HISTORY 7 rows selected. SQL> PRIVILEGE --------SELECT SELECT SELECT SELECT SELECT SELECT SELECT

TYPICAL or ALL. If statistics collection is not enabled, the database will not have the historical information

A simultaneous DDL table lock is held for operations that include the INSERT, UPDATE, DELETE, and the SELECT FOR UPDATE DML operations. DML operations need DDL table locks to ensure that some other transaction isn t changing the table definition while modifying data. This means that a table can t be altered or dropped while an uncommitted transaction is still holding a table lock on the table. Table locks can range from being very restrictive to minimally restrictive. Oracle acquires a row exclusive table lock, which indicates that a transaction holding the lock has updated one or more rows in the table. Other transactions are allowed to select, insert, update, delete, or lock rows in the same table concurrently. However, other transactions can t lock the table exclusively for their own reads or writes. All INSERT, UPDATE, and DELETE statements impose row exclusive locks. Table 6-2 summarizes the row-level and table-level DML locks that are acquired for the most common database operations. Table 6-2. DML Row- and Table-Level Locks Held for Common Operations

You tell it what data you are interested in (the time to go off), and you get your full night s sleep The alarm clock notifies you when it s time to get up Example 2 In a system that must react to the depressing of a button, it isn t efficient for the system to poll the button s status constantly because the button is only used occasionally Using a push interaction, the button notifies the system when it is depressed Example 3 The classic Model View Controller paradigm, or more specifically, the way the model interacts with the viewers, illustrates a push interaction When the controller makes changes to the model, the latter pushes notifications to the viewers The model acts as an event publisher, the viewers as event subscribers The model can support any number of viewers.

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