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Oracle s multi-versioning model for read consistency is applied by default at the statement level (for each and every query) and can also be applied at the transaction level. This means that each and every SQL statement submitted to the database sees a read-consistent view of the database at least and if you would like this read-consistent view of the database to be at the level of a transaction (a set of SQL statements), you may do that as well. The basic purpose of a transaction in the database is to take the database from one consistent state to the next. The ISO SQL standard specifies various transaction isolation levels, which define how sensitive one transaction is to changes made by another. The greater the level of sensitivity, the greater the degree of isolation the database must provide between transactions executed by your application. In the following section, we ll look at how, via its multi-versioning architecture and with absolutely minimal locking, Oracle can support each of the defined isolation levels.

The V$SYSTEM_PARAMETER dynamic view lists all the initialization parameters that are currently in effect for the session. The V$SYSTEM_PARAMETER2 view is similar, except that it lists multiple values of parameters in case they exist.

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The V$PARAMETER view shows you the initialization parameters that are in effect for a given session. The view inherits all the parameter values from the V$SYSTEM_PARAMETER instance view. There s also a V$PARAMETER2 view, and it s the counterpart of the V$SYSTEM_PARAMETER2 view. Listing 23-35 describes the V$PARAMETER view. Listing 23-35. Querying the V$PARAMETER View SQL> DESC V$PARAMETER Name Null Type ----------------------------------------- -------- -------------NUM NUMBER NAME VARCHAR2(80) /* name of the parameter TYPE NUMBER VALUE VARCHAR2(512) /* value of the parameter DISPLAY_VALUE VARCHAR2(512) ISDEFAULT VARCHAR2(9) /* if TRUE, parameter is set to default */ ISSES_MODIFIABLE VARCHAR2(5) /*can be modified using ALTER SESSION ISSYS_MODIFIABLE VARCHAR2(9) /*can be modified using ALTER SYSTEM ISINSTANCE_MODIFIABLE VARCHAR2(5) ISMODIFIED VARCHAR2(10) /* been modified since instance startup */ ISADJUSTED ISDEPRECATED DESCRIPTION UPDATE_COMMENT HASH SQL> VARCHAR2(5) VARCHAR2(5) VARCHAR2(255) VARCHAR2(255) NUMBER /* has Oracle adjusted user-set value */ /* description of the parameter */

When the execution of a command is expected to be lengthy or to involve several intermediate steps, a transparent interaction may be useful, because it allows the caller to monitor progress of the callee. If the progress feedback indicates that the callee is not following the expected course of action, the caller may choose to interrupt the command. Any number of reasons might be valid for aborting a command, including incorrect intermediate results or excessive time to complete the command. Figure 9-17 shows the basics of the interruptible transparent interaction pattern. Figure 9-17 shows a system using push feedback. As stated earlier, transparent interactions can use push or pull operations to get progress feedback to the caller. The basic interruptible transparent interaction pattern is not concerned with how feedback is returned to the caller, as long as feedback is provided in some way. If the caller uses pull interactions to get the progress updates, it is possible for the caller to include a flag in the requests to signal an abort request. A separate abort channel is desirable because it makes a clear distinction between the ordinary and extraordinary processing. For example, if the caller sends an abort command to the callee, the command may need to be executed in a thread that

The ANSI/ISO SQL standard defines four levels of transaction isolation, with different possible outcomes for the same transaction scenario. That is, the same work performed in the same fashion with the same inputs may result in different answers, depending on your isolation level. These isolation levels are defined in terms of three phenomena that are either permitted or not at a given isolation level: Dirty read: The meaning of this term is as bad as it sounds. You are permitted to read uncommitted, or dirty, data. You would achieve this effect by just opening an OS file that someone else is writing and reading whatever data happens to be there. Data integrity is compromised, foreign keys are violated, and unique constraints are ignored. Nonrepeatable read: This simply means that if you read a row at time T1 and attempt to reread that row at time T2, the row may have changed. It may have disappeared, it may have been updated, and so on.

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