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Figure 5-20. The layout of structured events The header is divided into two parts: a fixed portion and a variable portion. The fixed portion is very short and must be included in all structured event messages. It contains basic information, such as a domain name, a type name, and an event name. As an example, a stock-tracking application might create a structure event with the domain name NYSE Stock Quotes , the type name TickerAlarms , and the event name IBM . The fixed portion of the header data makes it possible for an event channel to group notifications for storage in an event repository. The purpose of such a repository is to provide persistence in the case of hardware failures and to allow consumers to browse stored notifications by type, name, or name-value combination. The variable portion of the header is optional and can contain an arbitrary number of name-value pairs, which you can also use to set QoS settings on a per-message basis. The message body is also divided into two parts, as the message header. The first part can contain an arbitrary number of name-value pairs that you can use for filtering purposes. The main body contains the real payload of the notification and can be arbitrarily long. The body is contained in a single variant field (of type CORBA::Any), so it can contain a string, a number, binary data, an array, or a custom type.

You can use a temporary tablespace group as your default temporary tablespace for the database. If you issue the following statement, all users without a default tablespace can use any temporary tablespace in the tmpgrp1 group as their default temporary tablespaces: SQL> ALTER DATABASE DEFAULT TEMPORARY TABLESPACE tmpgrp1; The preceding ALTER DATABASE statement assigns all the tablespaces in tmpgrp1 as the default temporary tablespaces for the database.

When you create new users, you can assign them to a temporary tablespace group instead of to the usual single temporary tablespace. Here s an example: SQL> CREATE USER salapati IDENTIFIED BY sammyy1 DEFAULT TABLESPACE users TEMPORARY TABLESPACE tmpgrp1; User created.

Notification filtering is based on name-value pairs included in a payload header. The burden of filtering is not on the Event Service, but on the proxy objects that forward notifications from the supplier to the channel. To achieve filtering, special Filter objects are defined and attached to the proxy, as shown in Figure 5-21.

SQL> Once you create a user, you can also use the ALTER USER statement to change the temporary tablespace group of the user. Here s a SQL statement that does this: SQL> ALTER USER salapati TEMPORARY TABLESPACE tmpgrp2;

You can use the new DBA_TABLESPACE_GROUPS data dictionary view to manage the temporary tablespace groups in your database. Here is a simple query on the view that shows the names of all tablespace groups: SQL> SELECT group_name, tablespace_name FROM dba_tablespace_groups; GROUP_NAME ---------TMPGRP1 SQL> TABLESPACE_NAME --------------TEMP01

You can also use the DBA_USERS view to find out which temporary tablespaces or temporary tablespace groups are assigned to each user. Here s an example: SQL> SELECT username, temporary_tablespace FROM dba_users; USERNAME -------SYS SYSTEM SAM SCOTT . . . SQL> TEMPORARY_TABLESPACE --------------------TEMP TEMP TMPGRP1 TEMP

When the proxy receives a notification, it calls the match method of each Filter. If any of the filters returns false, the notification is discarded; otherwise, it is forwarded to the event channel. The filters attached to a given proxy only affect that proxy. You create supplier proxies by calling a SupplierAdmin method. SupplierAdmin objects are the parents of supplier proxy objects. In order for all the proxies to use the same filters, the filters must be attached to the SupplierAdmin parent, as shown in Figure 5-22.

Prior to the Oracle Database 10g release, the System tablespace was the default permanent tablespace for any users you created if you neglected to assign the user to a default tablespace. As of Oracle Database 10g, you can create a default permanent tablespace to which a new user will be assigned if you don t assign a specific default tablespace when you create the user.

You can t drop a default permanent tablespace without first creating and assigning another tablespace as the new default tablespace.

To find out what the current permanent tablespace for your database is, use the following query: SQL> SELECT property_value FROM database_properties WHERE property_name='DEFAULT_PERMANENT_TABLESPACE'; PROPERTY_VALUE --------------

Figure 5-22. Common filters that apply to all supplier proxies When a supply proxy is given a message to deliver, it first checks the parent SupplierAdmin filters, then its own filters. A notification must satisfy all the filters; otherwise, it is rejected. You can also filter notifications on the consumer side of an event channel. Everything said thus far about filtering can be applied to the consumer side, so you can attach filters to ConsumerAdmin objects and consumer proxy objects. Filters can even be present simultaneously at both the supplier and consumer ends. There are two kinds of filters available: those related to QoS properties defined in the notification header, and those related to properties defined in the notification body. Filters work with expressions defining constraints on notification name-value pairs contained both in the header and body. The syntax of the filtering expressions is defined in an extensible constraint language that all filters must support. Implementation-dependent extensions are allowed, as long as they don t break the core language.