Advanced Queuing - Oracle

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JMS Propagation processes can be skewed based on the arrival rate of messages in the different source topics. If one process is overburdened with several active schedules while another is less loaded with many passive schedules, propagation automatically re-distributes the schedules among the processes such that they are loaded uniformly. Example Scenario In the BooksOnLine example, the OE_bookedorders_topic is busy since messages in it are propagated to different shipping sites. The following example code illustrates the calls supported by enhanced propagation scheduling for error checking and schedule monitoring. Example Code CONNECT OE/OE; /* get averages select avg_time, avg_number, avg_size from user_queue_schedules; /* get totals select total_time, total_number, total_bytes from user_queue_schedules; /* get maximums for a window select max_number, max_bytes from user_queue_schedules; /* get current status information of schedule select process_name, session_id, instance, schedule_disabled from user_queue_schedules; /* get information about last and next execution select last_run_date, last_run_time, next_run_date, next_run_time from user_queue_schedules; /* get last error information if any select failures, last_error_msg, last_error_date, last_error_time from user_queue_schedules; Exception Handling During Propagation When a system errors such as a network failure occurs, AQ will continue to attempt to propagate messages using an exponential back-off algorithm. In some situations that indicate application errors AQ will mark messages as UNDELIVERABLE if there is an error in propagating the message. 12-92 Oracle9i Application Developer’s Guide - Advanced Queuing
Message Transformation with JMS AQ Examples of such errors are when the remote queue/topic does not exist or when there is a type mismatch between the source queue/topic and the remote queue/topic.In such situations users must query the DBA_SCHEDULES view to determine the last error that occurred during propagation to a particular destination.The trace files in the $ORACLE_HOME/log directory can provide additional information about the error. Message Transformation with JMS AQ The following topics are discussed in this section: Defining Message Transformations Sending Messages to a Destination Using a Transformation Receiving Messages from a Destination Using a Transformation Specifying Transformations for Topic Subscribers Specifying Transformations for Remote Subscribers Defining Message Transformations Transformations can be defined to map messages of one format to another. Transformations are useful when applications that use different formats to represent the same information have to be integrated. Transformations can be SQL expressions and PLSQL functions. The transformations can be created using the DBMS_TRANSFORM.create_ transformation procedure. Transformation can be specified for the following operations: Sending a message to a queue or topic Receiving a message from a queue, or topic Creating a Topic Subscriber Creating a Remote Subscriber. This will enable propagation of messages between Topics of different formats. The Message Transformation feature is an AQ extension to the standard JMS interface. Creating Applications Using JMS 12-93
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Oracle9i Application Developer’s
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Contents Send Us Your Comments ....
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Enhanced Propagation Scheduling Cap
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Creating AQ Administrators and User
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Support for Statistics Views ......
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Removing an Alias from the LDAP Ser
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Priority and Ordering of Messages..
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Sending a Message Using a Queue Sen
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Specifying JMS Message Property as
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Gateway Agent .....................
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Enqueue of Messages for remote subs
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Send Us Your Comments Oracle9i Appl
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Preface This reference describes fe
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Chapter 9, "Administrative Interfac
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Conventions To download free releas
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Convention Meaning Example [] Brack
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Convention Meaning Example Special
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http://www.oracle.com/accessibility
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What’s New in Advanced Queuing? T
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The servlet parses the content of t
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Dequeue enhancements: Using the deq
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1 Introduction to Oracle Advanced Q
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Figure 1-1 Integrated Application E
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General Features of Advanced Queuin
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Support for Statistics Views Struct
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XMLType Payloads General Features o
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Figure 1-6 Architecture for Perform
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Correlation Identifiers Enqueue Fea
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Sender Identification Enqueue Featu
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Retries with Delays Dequeue Feature
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Third-Party Support Elements of Adv
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Recipient Elements of Advanced Queu
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Demos You can start a maximum of 10
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Table 1-1 Demos Demo and Locations
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The following basic components are
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Table 2-1 Type Name (type_name) Par
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Syntax TYPE aq$_subscriber_list_t I
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Table 2-4 Nonpersistent Queues Queu
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Table 2-7 lists the enumerated cons
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INIT.ORA Parameter File Considerati
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3 AQ Programmatic Environments This
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Table 3-1 (Cont.) AQ Programmatic E
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Examples Using Visual Basic (OO4O)
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Advanced Queuing Examples For JDK 1
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Oracle JMS Extensions Using Oracle
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Using the AQ XML Servlet to Access
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Table 3-2 Comparison of AQ Programm
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Alter a Subscriber DBMS_AQADM.alter
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Comparing AQ Programmatic Environme
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4 Managing AQ This chapter discusse
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Access to AQ Object Types Oracle 8.
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LNOCI Applications Queue Table Expo
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Importing Queue Table Data Creating
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Restrictions on Queue Management ig
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Propagation Issues Propagation Issu
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Propagation Issues all these circum
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Migrating To and From 8.0 Oracle 8.
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Security with 8.0-Style Queues Acce
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5 Performance and Scalability This
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Propagation Tuning Tips same segmen
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General Questions 6 Frequently Aske
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General Questions How do you associ
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General Questions 2 - Ex subscriber
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Messaging Gateway Questions mgwadm.
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Messaging Gateway Questions 3. Veri
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Propagation Questions Messaging Gat
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Transformation Questions Messaging
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Messaging Gateway Questions user. E
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Internet Access Questions Why doesn
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Performance Questions How do I use
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Installation Questions 2. Set up us
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Installation Questions NOTE: In Ora
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7 Modeling and Design This chapter
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Basic Queuing Basic Queuing Illustr
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Modeling Queue Entities Consumers A
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Multiconsumer Dequeuing of the Same
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Modeling Queue Entities produced by
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Modeling Queue Entities list of sub
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Modeling Queue Entities application
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Modeling Queue Entities whether the
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8 A Sample Application Using AQ In
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Structured Payloads General Feature
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For details on XMlType operations r
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end; Nonpersistent Queues END LOOP;
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OCIAttrGet((dvoid *)subscrhp, OCI_H
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printf("Initialization successful\n
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* End of file tkaqdocn.c */ Visual
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AQQueueTableProperty mqt_prop; AQQu
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Support for Statistics Views } Inte
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Enqueue Features cannot have the sa
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compatible => '8.1', \ primary_inst
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Enqueue Features set oraaq = OraDat
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{ AQSession aq_sess; AQQueue booked
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Time Specification: Delay } { /* Cr
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Set OraOrder = OraDatabase.CreateOr
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ack_order_queue_name := 'WS.WS_back
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} Message Grouping } catch (Excepti
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EXECUTE BOLADM.same_order_enq(’My
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dbms_aq.enqueue('WS.ws_bookedorders
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JOHN DASH 100 EXPRESS STREET REDWOO
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Dequeue Features messages with the
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* Dequeue the orders: */ CONNECT ES
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} Multiple Recipients catch (Except
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Dequeue Features init.ora parameter
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deq_cust_data BOLADM.customer_typ;
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Modes of Dequeuing if MsgIsDequeued
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Dequeue Features that the remove de
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Dequeue Features /* Dequeue all int
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} } } db_conn.commit(); Dequeue Fea
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Retry with Delay Interval Dequeue F
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* Create an AQ Session: */ aq_sess
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Dequeue Features DBMS_AQADM.START_Q
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Dequeue Features The following exam
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} Dequeue Features backorders_q = a
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Dequeue Features Eastern Region Sh
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END; queue_name => 'OS.OS_bookedord
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Dequeue Features Scenario In the cu
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no_message EXCEPTION; pragma EXCEPT
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* Get owner, queue where message is
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Dequeue Using the AQ XML Servlet As
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ub4 fedex; ub4 air; ub4 ground; };
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); printf("Initialization successfu
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sb4 errcode = 0; Asynchronous Notif
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Asynchronous Notifications BEGIN --
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Propagation Scenario Enhanced Pro
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PL/SQL (DBMS_AQADM Package): Exampl
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* Check if the schedule has been en
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length is a variable of type NUMBER
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Propagation Features retry time is
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Propagation Features Scenario In th
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import javax.servlet.*; import java
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dbms_aqadm.schedule_propagation('OE
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9 Administrative Interface This cha
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Use Case Model: Administrative Inte
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OR optional information add table d
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Creating a Queue Table Visual Basi
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dbms_aqadm.create_queue_table ( que
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q_table = aq_sess.createQueueTable
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Creating a Queue Table [Set Storage
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Altering a Queue Table PL/SQL (DBMS
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Dropping a Queue Table Figure 9-4 D
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force => TRUE); Java (JDBC): Droppi
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OR OR OR default optional informati
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Creating a queue within a queue tab
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} Creating a multiconsumer queue wi
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Creating a Nonpersistent Queue mess
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See Also: Table 9-1 for a list of a
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Dropping a Queue Figure 9-8 Droppin
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Java (JDBC): Dropping a Queue /* Dr
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Creating a Transformation Usage Not
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Modifying a Transformation Figure 9
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Applying a Transformation Figure 9-
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Dropping a Transformation PL/SQL (D
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Starting a Queue Syntax See Chapter
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Stopping a Queue Figure 9-14 Stoppi
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Java (JDBC): Stopping a Queue /* St
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Granting System Privilege See Chapt
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Revoking System Privilege Figure 9-
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Granting Queue Privilege Figure 9-1
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Revoking Queue Privilege Figure 9-1
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} AQQueue queue; /* Get the queue o
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Purpose Adds a default subscriber t
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* Where the transformation was crea
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agent1 = new AQAgent("East_Shipping
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See Also: Table 9-1 for a list of a
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’AQ.MSG_MAP1’); /* Alter the su
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Purpose Remove a default subscriber
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Scheduling a Queue Propagation Figu
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PL/SQL (DBMS_AQADM): Scheduling a Q
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Unscheduling a Queue Propagation Fi
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} AQAgent agent1; AQAgent agent2; /
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Note: The sys.aq$_message_types tab
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Altering a Propagation Schedule Fig
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eached by the database link another
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Enabling a Propagation Schedule Exa
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Disabling a Propagation Schedule Fi
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} AQQueue queue; AQAgent agent1; AQ
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Purpose Registers an agent for AQ I
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Purpose Alters an agent registered
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PL/SQL: Example not provided. VB (
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Enabling Database Access Examples S
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VB (OO4O): Example not provided. J
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Java (JDBC): Oracle9i Supplied Java
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Removing an Alias from the LDAP Ser
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10 Administrative Interface: Views
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Selecting All Queue Tables in Datab
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Selecting User Queue Tables Figure
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Selecting All Queues in Database Fi
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Selecting All Propagation Schedules
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Purpose This view describes the cur
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Selecting Queues for Which User Has
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Selecting Queues for Which User Has
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Selecting Messages in Queue Table F
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Table 10-8 (Cont.) View for Selecti
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Selecting Queue Tables in User Sche
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Selecting Queues In User Schema Fig
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Selecting Propagation Schedules in
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Purpose Table 10-11 USER_QUEUE_SCHE
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Selecting Queue Subscribers Figure
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Selecting Queue Subscribers and The
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Selecting the Number of Messages in
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Selecting the Number of Messages in
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Selecting the AQ Agents Registered
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Table 10-17 USER_TRANSFORMATIONS Co
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Table 10-19 DBA_TRANSFORMATIONS Col
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11 Operational Interface: Basic Ope
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Table 11-1 (Cont.) Use Case Model:
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Purpose Adds a message to the speci
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See Also: Purpose To specify the op
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Enqueuing a Message [Specify Messag
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Enqueuing a Message [Add Payload] S
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DBMS_AQ.ENQUEUE(queue_name => ’ms
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} Enqueuing a Message [Add Payload]
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} raw_payload.setStream(b_array, b_
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Listening to One or More Single-Con
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Listen to Single-Consumer Queue (Ti
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} Listening to One or More Single-C
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OCIEnvInit( &envhp, (ub4) OCI_DEFAU
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} Listening to One or More Single-C
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Listening to One or More Multiconsu
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Listening to One or More Multiconsu
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} Listening to One or More Multicon
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OCIEnv *envhp; OCIServer *srvhp; OC
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} printf("MESSAGE for :- \n"); GetA
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Usage Notes Search criteria and deq
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Dequeuing a Message from a Single-C
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Dequeuing a Message from a Single-C
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' of "RELATIVE_MSG_ID" Q.Navigation
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See Also: Dequeuing a Message from
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Registering for Notification Figure
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PL/SQL (DBMS_AQ Package): Not avail
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Registering for Notification [Speci
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Posting for Subscriber Notification
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Adding an Agent to the LDAP Server
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Removing an Agent from the LDAP Ser
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12 Creating Applications Using JMS
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J2EE Compliance General Features of
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JMS Connection and Session General
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General Features of JMS To connect
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General Features of JMS A JMS Conne
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General Features of JMS acknowledg
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General Features of JMS There are t
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alter() - alters a queue or topic G
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General Features of JMS CREATE USER
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General Features of JMS backed_orde
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General Features of JMS /* Check in
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General Features of JMS JMS time st
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Table 12-1 Message Header Fields Me
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General Features of JMS Stream Mess
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General Features of JMS Object Mess
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JMS_OracleDelay JMS_OracleOriginalM
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public String getRegion() { return
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eturn quantity; } } /* * BolBook -
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} this.custid = custid; this.name =
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Queue Sender JMS Point-to-Point Mod
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Page 557 and 558: Durable Subscriber JMS Publish-Subs
Page 559 and 560: Example Code JMS Publish-Subscribe
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Page 563 and 564: TopicReceiver } System.out.println(
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Page 589 and 590: } } try { /* cast to JMS Object Mes
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Page 609 and 610: } Message Transformation with JMS A
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Page 613 and 614: 13 JMS Administrative Interface: Ba
Page 615 and 616: Use Case Model: JMS Administrative
Page 617 and 618: Registering a Queue/Topic Connectio
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Page 629 and 630: Getting a Queue Connection Factory
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Page 633 and 634: Getting a Topic Connection Factory
Page 635 and 636: Getting a Topic Connection Factory
Page 637 and 638: Getting a Queue/Topic Connection Fa
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Page 643 and 644: Getting a Queue Table Figure 13-15
Page 645 and 646: Specifying Destination Properties F
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Purpose Grant a topic privilege in
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Revoking Topic Privileges—Publish
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Purpose Grant a queue privilege in
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Purpose Revoke queue privilege in t
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Starting a Destination Usage Notes
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Purpose Stop a destination. Stoppin
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Syntax See Java (JDBC): Oracle9i Su
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TopicSession t_sess; Topic topic; (
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Enabling a Propagation Schedule Fig
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Altering a Propagation Schedule Fig
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Disabling a Propagation Schedule Fi
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See Also: Table 13-1 for a list of
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14 JMS Operational Interface: Basic
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Creating a Queue Connection with Us
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See Also: Purpose Create a queue co
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Creating a Queue Connection with an
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Creating a Queue Session Figure 14-
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Sending a Message Using a Queue Sen
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Sending Messages Using a Queue Send
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Creating a Queue Browser for Queues
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Browsing Messages Using a Queue Bro
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Creating a Queue Receiver for Queue
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Creating a Queue Receiver for Queue
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Creating a Queue Connection with an
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Use Case Model: JMS Operational Int
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Usage Notes Not applicable. Creatin
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Creating a Topic Connection with De
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Creating a Topic Connection with an
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Syntax Java (JDBC): Oracle9i Suppli
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See Also: Publishing a Message Usin
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Publishing a Message Using a Topic
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See Also: Publishing a Message Usin
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Creating a Durable Subscriber for a
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See Also: Purpose Create a durable
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Example Creating a Durable Subscrib
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Creating a Remote Subscriber for To
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Creating a Remote Subscriber for To
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Example Creating a Remote Subscribe
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Unsubscribing a Durable Subscriptio
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Unsubscribing a Durable Subscriptio
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Creating a Topic Receiver for a Top
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See Also: Creating a Topic Receiver
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Creating a Topic Browser for Topics
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See Also: Creating a Topic Browser
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Browsing Messages Using a Topic Bro
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Use Case Model: JMS Operational Int
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Starting a JMS Connection Figure 16
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Usage Notes Not applicable. Committ
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See Also: Purpose Rollback All Oper
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Getting the Underlying OracleOCICon
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Creating a Map Message Usage Notes
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Creating a Stream Message Figure 16
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Creating a Text Message Refer to Ja
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Creating a JMS Message Figure 16-12
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Creating an ADT Message Syntax See
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Specifying Message Correlation ID F
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Specifying JMS Message Property Fig
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Setting Default TimeToLive for All
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Setting Default Priority for All Me
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Usage Notes Not applicable. Creatin
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Receiving a Message Synchronously U
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Specifying the Navigation Mode for
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Specifying a Message Listener to Re
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Specifying a Message Listener to Re
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Getting the Correlation ID of a Mes
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Purpose Get the Message ID of a Mes
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Getting the JMS Message Property Fi
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See Also: Purpose Get the Message P
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Purpose Get the Message Property as
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Getting the JMS Message Property as
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See Also: Purpose Get the Message P
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Closing a Message Producer Figure 1
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Stopping a JMS Connection Figure 16
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See Java (JDBC): Oracle9i Supplied
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Usage Notes Not applicable. Getting
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See Also: Purpose Get the Error Mes
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Printing the Stack Trace for the JM
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Getting the Exception Listener Usag
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Setting the Ping Period for the Exc
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Getting the Ping Period for the Exc
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17 Internet Access to Advanced Queu
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Figure 17-2 Architecture for Perfor
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SOAP Method Invocation The Internet
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Notifications from the server to th
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Message Payloads AQ supports messag
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Required elements are shown in bold
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scott 100 NEW URGENT EAST 1001
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scott 1111 Mary 5000 1996-01-01
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1 1 toyota john scott aqus
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scott The Internet Data Access P
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The Internet Data Access Presentati
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The Internet Data Access Presenta
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Rollback Request Example A rollback
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. The Internet Data Access Presenta
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Example A FAULT message has the fol
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IDAP Schema 'http://schemas.xmlsoap
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SOAP and AQ XML Schemas
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Deploying the AQ XML Servlet The AQ
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User Authentication $ORACLE_HOME/li
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Deploying the AQ XML Servlet Mappin
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} Hashtable env = new Hashtable(5,
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Deploying the AQ XML Servlet 2. Cre
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Using HTTP to Access the AQ XML Ser
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Using HTTP to Access the AQ XML Ser
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Figure 17-3 HTTP Advanced Queuing P
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. Map the AQ agent to a database us
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} db_drv.getCacheSize(10); this.set
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Customizing the AQ Servlet The void
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} this.setAQDataSource(db_drv); /*
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18 Messaging Gateway Messaging Gate
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Messaging Gateway Architecture For
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Gateway Agent Propagation Processin
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1. Loading Database Objects into th
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Modifying tnsnames.ora: Example MGW
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Setup Verification Creating a Messa
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Working with Messaging Gateway desc
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The following command shuts down th
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end; Working with Messaging Gateway
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Working with Messaging Gateway The
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The propagation type (inbound or ou
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end; Working with Messaging Gateway
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Working with Messaging Gateway inst
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Converting Messages Converting Mess
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Messaging Gateway Canonical Types C
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Converting Messages An AQ payload o
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Converting Messages The MQSeries fi
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Converting Messages Advanced Queuin
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Table 18-4 Messaging Gateway Names
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Table 18-5 MQSeries Header Default
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queue_name => ’AQ_book_orders’,
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Converting Messages Propagating Inb
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File Contents Initialization Parame
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Format: set CLASSPATH= The mgw.ora
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A Oracle Advanced Queuing by Exampl
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- Managing Propagation From One Que
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Creating a Queue Table and Queue of
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Creating an Java AQ Session Creatin
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Creating a Queue and Start Enqueue/
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Enqueuing and Dequeuing Of Messages
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EXEC SQL CONNECT :user; /* On an or
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{ OCIEnv *envhp; OCIServer *srvhp;
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public static void AQObjectPayloadT
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this.empNo = empNo; } ////// implem
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} /* Enqueue a message in test_queu
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void sql_error(msg) char *msg; { EX
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} Enqueuing and Dequeuing of RAW Ty
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} /* Get a handle to a queue - aq_q
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AQRawPayload raw_payload; AQEnqueue
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DBMS_AQ.ENQUEUE(queue_name => ’pr
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} } else m_property.setPriority(3);
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and remove RED from queue: */ DECLA
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char subject[30]; /* components of
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* Bind the host variable ’message
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int main() { OCIEnv *envhp; OCIServ
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ecipients DBMS_AQ.aq$_recipient_lis
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WHEN no_messages THEN DBMS_OUTPUT.P
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dequeue_options.navigation := DBMS_
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SELECT t.user_data.data INTO lob_lo
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Connection db_conn = null; AQEnqueu
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} Thread.sleep(30000); // dequeue m
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END; BEGIN DBMS_AQADM.SCHEDULE_PROP
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queue_name => ’q1def’, destinat
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EXECUTE DBMS_AQADM.DROP_QUEUE ( que
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* XA open string */ char xaoinfo[]
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Deploying AQ with XA envhp = xaoEnv
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#include #endif #include static v
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ub4 buflen; OCIInitialize((ub4) OCI
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struct message { OCINumber id; OCIS
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AQ and Memory Usage OCIHandleAlloc(
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OCIInd null_adt; OCIInd null_id; OC
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(ub4) OCI_ATTR_SERVER, (OCIError *)
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LNOCIError *errhp; LNOCISvcCtx *svc
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OCIAttrSet((dvoid *)svchp, (ub4)OCI
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B Oracle JMS Interfaces, Classes, a
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Table B-1 (Cont.) Interfaces, Class
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Oracle JMSClasses (part 1) Figure B
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Oracle JMS Classes (part 2) Figure
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See Also: "Interface - javax.jms.M
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See Also: "Interface - javax.jms.Q
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Oracle JMS Classes (part 10 continu
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readBoolean() readByte() readBytes(
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See Also: "Oracle JMSClasses (part
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setDouble(String, double) setFloat(
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See Also: "Oracle JMS Classes (par
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close() commit() createBytesMessage
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writeString(String) Interface - jav
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getErrorCode() getLinkedException()
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getNavigationMode() receiveNoData()
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getAdtPayload() setAdtPayload(Custo
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STATE_WAITING TRANSACTIONAL WAIT_FO
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INFINITE NORMAL_QUEUE > AQjmsDestin
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Class - oracle.jms.AQjmsSession > o
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Interfaces, Classes, and Exceptions
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Exception oracle.jms.AQjmsMessageEO
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setPrimaryInstance(int inst) setSec
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C Scripts for Implementing BooksOnL
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tkaqdoca.sql: Script to Create User
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connect CS/CS tkaqdocd.sql: Example
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wait_time INTEGER := 120; no_messag
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tkaqdoce.sql: Operational Examples
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tkaqdocp.sql: Examples of Operation
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egin end; dopt.consumer_name := con
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end; / show errors; tkaqdocp.sql: E
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grant execute on shipping_bookedord
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end; / show errors; tkaqdocp.sql: E
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tkaqdocc.sql: Clean-Up Script tkaqd
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D JMS and AQ XML Servlet Error Mess
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JMS Error Messages Cause: An attemp
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JMS Error Messages Action: The vali
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JMS Error Messages Cause: An attemp
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JMS-163 Message not Writeable Cause
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JMS Error Messages Action: Specify
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JMS Error Messages Cause: There is
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AQ XML Servlet Error Messages JMS-4
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Action: The valid navigation modes
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Action: Specify a valid data source
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E Unified Modeling Language Diagram
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Use Case Diagrams As shown in Figur
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equires that you first create a te
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Figure E-9 Required and Optional Op
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State Diagrams Figure E-11 A Class
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A access control. See system-level
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features, 8-58 message navigation,
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Interface - javax.jms.TopicSession,
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operational interface basic operati
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R basic, 7-3 basic, one producer, o
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V view, 10-1 attributes, 10-1 views
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Advanced Queuing - Oracle

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