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e ve reached the last piece of the architecture puzzle. We ve investigated the database and the set of physical files that constitute a database. In covering the memory used by Oracle, we ve looked at one half of an instance. The last remaining architectural issue to cover is the set of processes that constitute the other half of the instance. Each process in Oracle will perform a particular task or set of tasks, and each will have internal memory (PGA memory) allocated by it to perform its job. An Oracle instance has three broad classes of processes: Server processes: These perform work based on a client s request. We have already looked at dedicated and shared servers to some degree. These are the server processes. Background processes: These are the processes that start up with the database and perform various maintenance tasks, such as writing blocks to disk, maintaining the online redo log, cleaning up aborted processes, and so on. Slave processes: These are similar to background processes, but they are processes that perform extra work on behalf of either a background or a server process. Some of these processes, such as the database block writer (DBWn) and the log writer (LGWR), have cropped up already, but here we ll take a closer look at the function of each, and what each does and why.

GRANTEE TABLE_NAME COLUMN_NAME PRIVILEGE ---------- --------------- ------------ ---------OE EMPLOYEES SALARY UPDATE SQL>

The purpose of a pull interaction is for one party to obtain information from another. I ll use the word interrogator to designate the party starting the interaction, and the word respondent for the party that answers with the data. In a pull interaction, the interrogator sends a request to the respondent, which replies with a response, as shown in Figure 9-2.

The DBA_POLICIES view shows all the security policies in the database. You can find out what operations (SELECT, INSERT, UPDATE, and DELETE) are in the policy and whether the package is enabled.

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Note When I use the term process in this chapter, consider it to be synonymous with the term thread on operating systems where Oracle is implemented with threads (such as Windows). In the context of this chapter, I use the term process to cover both processes and threads. If you are using an implementation of Oracle that is multiprocess, such as you see on UNIX, the term process is totally appropriate. If you are using a single-process implementation of Oracle, such as you see on Windows, the term process will actually mean thread within the Oracle process. So, for example, when I talk about the DBWn process, the equivalent on Windows is the DBWn thread within the Oracle process.

Listing 23-11 shows a typical query on the DBA_POLICIES view. Note that in this example, there are no user-created polices. The sys_default group is the default policy group for all policies. Listing 23-11. Querying the DBA_POLICIES View SQL> 2 3 4 5 6* SELECT policy_name, policy_group, object_name, sel,ins,upd,del, enable FROM dba_policies;

Figure 9-2. The pull interaction pattern Linguistically, a pull interaction is associated with an interrogative sentence type. Pull interactions are effective when the following two things apply: 1. The interrogator needs to control when information is retrieved. 2. The interrogator only needs information at a given time. The interrogator s request can convey the type of information needed. The respondent s response supplies the information. If the interrogator uses a method call to query for information, the method can define parameters to hold the response information. If the interrogator uses a message for the query, a separate interaction is required for the response. The response is not considered a push interaction, because the interrogator determined its timing. Pull interactions are particularly effective when the interrogator only needs information at specific and infrequent times. It would be wasteful for the respondent to push the information using change notifications, especially if changes occurred frequently. Pull interactions are very common for two reasons: 1. They are simple to implement, because both the interrogator and the respondent can be synchronous. A simple method call is sufficient. 2. They apply to the common situation in which status changes in the respondent don t require the interrogator to react immediately: The interrogator will discover the change the next time it requests status. There are numerous examples of the pull pattern in everyday life and in computing.

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