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Figure 5-1. Typical dedicated server connection Your client application will have Oracle libraries linked into it. These libraries provide the APIs you need in order to talk to the database. These APIs know how to submit a query to the database and process the cursor that is returned. They know how to bundle your requests into network calls that the dedicated server will know how to unbundle. This piece of software is called Oracle Net, although in prior releases you might have known it as SQL*Net or Net8. This is the networking software/protocol that Oracle employs to allow for client/server processing (even in an n-tier architecture, there is a client/server program lurking). Oracle employs this same architecture even if Oracle Net is not technically involved in the picture. That is, even when the client and server are on the same machine this two-process (also known as twotask) architecture is still employed. This architecture provides two benefits: Remote execution: It is very natural for the client application to be executing on a machine other than the database itself. Address space isolation: The server process has read-write access to the SGA. An errant pointer in a client process could easily corrupt data structures in the SGA if the client process and server process were physically linked together. In 2, we saw how these dedicated servers are spawned or created by the Oracle listener process. We won t cover that process again; rather, we ll quickly look at what happens when the listener isn t involved. The mechanism is much the same as it was with the listener, but instead of the listener creating the dedicated server via a fork()/exec() in UNIX or an interprocess communication (IPC) call in Windows, the client process itself creates it.

The DBA_AUDIT_SESSION view contains information only on the CONNECT and DISCONNECT statements issued in the database.

The DBA_AUDIT_STATEMENT dictionary view captures all audit trail records that involve an ALTER SYSTEM, GRANT, REVOKE, AUDIT, or NOAUDIT statement issued in the database.

Note There are many variants of the fork() and exec() calls, such as vfork(), execve(), and so on.

You use the DBA_AUDIT_TRAIL view to examine all audit trail entries. The view displays the user s name, the audit auction (SELECT, INSERT, and so on), the time stamp, the privilege used to execute the audited statement, and the SQL statement itself. The DBA_AUDIT_EXISTS view shows the audit trail for AUDIT EXISTS and AUDIT NOT EXISTS.

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In general, polling is a pull type of interaction and is especially efficient when new data is frequently available or if changes occur with some predictability If changes occur rarely, many requests by the interrogator will result in a no-new-information response, which usually equates to a wasted or useless interaction You can use a pull interaction pattern to poll multiple respondents in sequence A respondent can be anything from a hardware mechanism to a variable to a remote process After one respondent is polled, the next one is polled, and so on After polling the last respondent in the sequence, the entire process repeats This interaction arrangement is known as round-robin polling, and is shown in Figure 9-3 Round-robin polling applies to situations in which respondents are reliable and respond quickly.

The new DBA_COMMON_AUDIT_TRAIL view shows all audit trail entries, including standard as well as fine-grained auditing polices. The view also shows all mandatory and SYS audit records. The V$XML_AUDIT_TRAIL dynamic view shows standard, fine-grained, SYS, and mandatory audit records in XML-format files.

The call used by Oracle may vary by operating system and implementation, but the net effect is the same.

The DBA_AUDIT_POLICIES view shows all fine-grained auditing policies in your database. The DBA_AUDIT_POLICY_COLUMNS view shows all fine-grained audit policy columns. The DBA_FGA_AUDIT_TRAIL view displays all audit records for fine-grained auditing. You can see the name of the fine-grained auditing policy as well using this view.

In many cases, the interrogator makes a polling pass over all the respondents and then goes on to do other things The interrogator only polls again when some condition applies, such as the passage of a certain amount of time or the detection of an event Polling requires a certain amount of faith in the respondents If a respondent hangs for any reason, by crashing or waiting for results from another process, it might hang the entire polling loop In the simplest round-robin polling scheme, the polling sequence is fixed Consider a scenario in which multiple respondents have new data simultaneously If one respondent has a greater chance of having new information, or if its information is more important than that of other respondents, the interrogator might need to poll that respondent more frequently than the others or poll the respondents in a certain order.

Several important data dictionary views relate to space and storage issues. When you want to monitor or change storage at the data file or the tablespace level, you ll most likely use one or a combination of these views. In the following sections you ll look at how you can use these views to manage space in the database.

fork() creates a new process that is a clone of the parent process, and on UNIX this is the only way to create a new process. exec() loads a new program image over the existing program image in memory, thus

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