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					TECHNICAL WHITE PAPER




Sybase® Real-Time Data Services
TABLE OF CONTENTS

     1   Challenges for Real-Time Enterprises
     1   The Essentials for Real-Time Information Flow
     1   Current Approaches to Supporting Real-Time Information Flow
 3       Sybase Real-Time Data Services
 4       Sybase Real-Time Data Services Deployment Options
 4       Configuration 1: Capture Events from Sybase ASE and Publish via TIBCO JMS or IBM WebSphere MQ Natively
 6       Configuration 2: Any Database to any Message Bus Through Sybase RepConnector
 7       Configuration 3: Sybase Real-Time Data Services in Conjunction with Enrichment and Transformation
 8       Conclusion


Further information: www.sybase.com/RTDS




 i
“For years people have used                CHALLENGES FOR REAL-TIME ENTERPRISES
 databases to find information               Companies have long pursued the goal of real-time information flow as a way to provide better services more
 that is meaningful to them. Now           responsively, and at lower cost. Initiatives such as Business Process Monitoring, Business Activity Monitoring, and
 with Sybase Real-Time Data                Real-time Analytics are driving the need for more timely access to information stored in a variety of operational
                                           databases. In order to achieve the goal of a more agile, responsive, and real-time enterprise, organizations increasingly
 Services, meaningful information
                                           require the ability to collect and analyze information from multiple systems in real time. To do this, organizations
 finds them—enabling decision-
                                           must be able to capture events as they happen in the operational system, and to provide information from these
 makers to respond immediately
                                           events to other applications. Traditional batch "snapshot" processes that extract data from operational systems and
 to changing business events.”             load the data into other applications involve varying degrees of latency, and place added workloads on the operational
                                           system, which can degrade performance and slow down business transactions.
      Raj Nathan, Senior Vice President,
Information Technology Solutions Group

                                           THE ESSENTIALS FOR REAL-TIME INFORMATION FLOW

                                             In developing the necessary infrastructure to support real-time information flow throughout an enterprise, the
                                           following considerations come into play.

                                             Very low latency. The definition of “real-time” will vary from business to business and project to project. For some
                                           applications, a delay of hours is acceptable. For other applications, the delay between the occurrence of the event on
                                           the operational system and the availability of the data to other applications must be within seconds. True event-
                                           driven, real-time information flow is particularly important for applications such as fraud detection, inventory
                                           management, or customer service—where up-to-the-moment data is essential.

                                             Minimize impact on the operational system. Real-time information flow is critical, but not at the expense of the
                                           performance of the operational system. The systems from which events must be captured in real time are typically
                                           used to run the operations of the business. The processes that provide real-time information flow must preserve the
                                           performance characteristics of the operational system.

                                             Minimize development and maintenance costs. The real-time information flow processes must be flexible,
                                           extensible, and scalable without burdening the organization with undue development and maintenance costs.

                                             Multi-platform support. True enterprise-wide real-time information flow requires support of heterogeneous
                                           databases, operating system and messaging backbones.


                                           CURRENT APPROACHES TO SUPPORTING REAL-TIME INFORMATION FLOW

                                             The notion of real-time information is not new. Market forces have fueled a constant drive for organizations to
                                           improve their efficiency and performance. Reducing or removing data latency improves decision making and
                                           customer service, and it increases users’ confidence in the data. Current techniques for implementing real-time
                                           information flow involve the following products and techniques.

                                             Extract, Transform and Load (ETL) tools. ETL tools are typically used to pull data from source systems and load or
                                           refresh a target system in batch mode—usually daily. For many organizations, much of this information is extremely
                                           valuable, but has a limited shelf-life. Therefore, many applications require a “trickle feed” of data from the source
                                           system to the target system. Most ETL products have introduced real-time features to support this need. The real-
                                           time offerings in ETL products are not complete offerings. All ETL tools rely on some other process to capture the
                                           changes from the operational system and make these changes available to the ETL tools via a message bus.




                                                                                                                                                                    1
      Development of custom point-to-point applications. In the absence of infrastructure to flow information in real
    time between applications, some organizations have developed point-to-point applications between systems. The
    approach has a number of drawbacks.

      • Each new interface requires development of a new application. This is both inflexible and very expensive. Point-to-
        point applications are inflexible in that each new system involved in real-time information flow requires the
        development of a new application. Point-to-point applications are expensive in that the customer incurs the
        expense of maintaining the custom code. The number of point-to-point interfaces can grow exponentially as
        systems are added.
      • The point-to-point applications still need some mechanism for identifying changes in the operational system.

      Modification of operational or “source” applications to publish changes in real time. This approach may involve the
    implementation of a message backbone to alleviate the need to implement point-to-point applications. This approach
    is still problematic, requiring changes to the operational applications, and can adversely affect the performance of the
    operational application.

      Development of polling applications. Customers can reduce information latency by polling the operational system
    for changes. Polling could take place every few minutes or every few hours. While this approach can improve the
    data's freshness, it does have drawbacks. The process of polling the operational database will affect the performance
    of the operational system. Polling typically requires a “time changed” field in the operational database. If such a field
    does not exist in the operational database, polling may be impossible. Even if this field does exist, the organization is
    faced with the trade-off of indexing the field (which will slow writes to the operational application) or requiring full
    table scans during the polling process (which will have a significant performance impact on the operational system
    during the polling process).

      Polling is not event-driven. The customer must choose between more frequent polling, which places a greater
    burden on the operational system and less frequent polling, which reduces data freshness.

      More frequent batch updates. An alternative to polling applications is to run batch updates more frequently.
    Instead of running batch update processes daily, the organization might run them two to four times per day. This is a
    compromise that does not truly provide real-time information flow. The organization is faced with trade-off similar to
    those identified for polling applications; more frequent batch updates place more of a burden on the operational
    system while less frequent batch updates increase the latency.

      Creation of shadow tables on the operational system. Some custom applications and vendor-provided solutions
    create shadow tables as a means of capturing data changes to the operational system. This approach can have an
    adverse impact on the performance of the operational system. It also requires that an additional process send data
    from shadow table to the target system.




2
SYBASE REAL-TIME DATA SERVICES

  The objective of Sybase Real-Time Data Services is to capture events as they occur in the source database and to
publish the data from these events to a message bus. Real-Time Data Services transforms your operational databases
from a passive data store waiting for applications to request required data to an active system. With Real-Time Data
Services, the database proactively publishes data to message busses without degrading the performance of the
source database. Real-Time Data Services replaces less timely, less efficient techniques that pull data from the source
database with an information hub that consolidates and pushes data events from heterogeneous database sources
to the consuming applications.


Heterogeneous Database Suppport
  Sybase Real-Time Data Services supports real-time event capture and flow from multiple databases. Real-Time Data
Services supports Sybase Adapter Server® Enterprise (ASE), Oracle®, IBM® DB2® and Microsoft® SQL Server. With Real-
Time Data Services, organizations can capture transactions in real time from heterogeneous databases without
developing separate, custom change-capture applications for each type of database.


Publishes Data via a Message Bus
  Sybase Real-Time Data Services delivers data to the consuming applications via a message bus. Real-Time Data
Services supports multiple messaging systems, including Java Message Service (JMS), IBM WebSphere® MQ and TIBCO
Rendezvous™. The use of a message bus to publish data to consuming applications eliminates the need to develop
point-to-point interfaces. Support for multiple message backbones allows organizations to integrate seamlessly Real-
Time Data Services into existing messaging infrastructures.


Native, Bi-Directional Messaging Support in Sybase ASE
  Sybase ASE provides built-in functions to allow applications to publish to or subscribe from TIBCO’s JMS and IBM's
WebSphere MQ implementation. Applications that use Sybase ASE can publish or consume events directly from
database triggers, stored procedures, or any component of the application invoking Transact-SQL.


Non-Intrusive
  Sybase Real-Time Data Services captures events as they occur on the source database. Sybase RTDS captures
changes from the transaction log maintained by the operational database. This eliminates the need to run
performance-impacting polling applications or to maintain costly shadow tables on the operational database.


Eliminates the Need for Creating Custom-Coded Interfaces
  Sybase Real-Time Data Services provides a unified platform for capturing events from heterogeneous databases
and publishing the events to a message bus. Real-Time Data Services allows you to capture events from existing
database applications and publish those events to a message bus without developing custom applications or
modifying existing applications.


Enables Transformation of Structured Data from Source Database to XML for Consumption by External Applications
  The vast majority of data stored in RDBMS systems is structured. Many consuming applications require that
messages be published in XML format. Sybase RTDS produces messages in a standard XML format. This enables other
applications to read and process messages produced by Sybase RTDS easily.




                                                                                                                       3
    SYBASE REAL-TIME DATA SERVICES DEPLOYMENT OPTIONS

      Sybase Real-Time Data Services is a complete, end-to-end solution for capturing database events and publishing
    the events to a message bus. Real-Time Data Services consists of the following software components:

      • Sybase Adaptive Server Enterprise version 12.5.3a
      • Sybase Replication Server® version 12.6
      • Sybase RepConnector version 2.5

      The various components included provide organizations with everything needed to event-enable their existing
    operational systems as well as a choice of deployment options. Sybase Real-Time Data Services can be deployed in a
    number of different configurations, depending on the needs of the application. The factors that determine the
    optimal configuration include the types of databases from which events will be captured, the message backbone
    deployed, and the volume of messages that will be published. Four different configuration options are detailed below.



      Use Case: Financial Services. Trading systems need proactive notifications of changes to customer data and
    securities data. For example, if a “buy” limit for security is reached, a flag is set in the database. This information needs
    to be sent immediately to all the trading systems in order to limit the risk of exposure. Current solutions involve
    polling the securities database. As trading moves from “value-based” to “volume-based” polling creates a performance
    impact on operational systems that is unacceptable, and the risk of exposure grows dramatically.

      With Sybase RTDS, the securities database is configured to send a message when the “buy” limit is reached. This is
    accomplished without writing custom code, polling the database or creating shadow tables. All trading systems
    connected to the message bus are immediately notified that the “buy” limit has been reached.




    CONFIGURATION 1: CAPTURE EVENTS FROM SYBASE ASE AND PUBLISH VIA TIBCO JMS OR IBM
    WEBSPHERE MQ

      This configuration exploits the Real-Time Message Service feature of Sybase ASE 12.5.3a and allows Sybase ASE 12.5.2
    to interact natively with TIBCO Enterprise JMS or IBM WebSphere MQ message bus. Sybase ASE applications can send
    and receive messages via JMS (See Figure 1). This example illustrates a sales order application running on Sybase ASE.
    As orders are entered in the sales order database, messages are published to a JMS message bus. Note that ASE
    supports both a point-to-point and publish/subscribe JMS model (the example in Figure 1 illustrates the use of the
    publish/subscribe model because the data from the sales order needs to be consumed by multiple applications; the
    JMS point-to-point model supports only one message consumer).

      The transact SQL function msgpublish is used to publish the sales order to a specific topic. This topic is subscribed
    to by a sales force automation application for use by field sales personnel, by a sales forecasting application used by
    sales management, and in a customer relationship management analytical application requiring real-time data.

      Additionally, the Real-Time Message Service capability is bi-directional. ASE can consume messages from JMS.

      This configuration is appropriate when the source of the database events is Sybase ASE and the messaging
    backbone is TIBCO EMS or IBM WebSphere MQ. This architecture provides a number of advantages:

      • Very easy to configure.
      • Proactive—ASE databases “push” events via a message bus, rather than waiting for applications to “pull” time-
        critical data.
      • Eliminates the need to poll the ASE database to provide data to other applications and is therefore less intrusive
        to operational source systems.




4
  • Eliminates the need to create shadow tables in ASE, which is also less intrusive to operational systems.
  • Very high performance, as triggers can be leveraged to send events to JMS natively. Additionally, multiple SQL
    clients can consume messages and archive them in the database at a high rate.
  • Supports both point-to-point and publish/subscribe JMS models.
  • Flexible transaction semantics. Relationships can be defined between the transaction semantics in the database
    and the interaction with the message bus on a per-transaction basis. There are three possible settings:
   o Fully transactional messaging—In this mode, a rollback of a database transaction will undo work performed
       on the message bus, and errors encountered on the message bus will rollback the transaction in ASE in which
       the message bus error was encountered.
   o Simple transactional messaging—In this mode, rollback of the database transaction in ASE will undo the work
       performed on the message bus, but errors encountered in the message bus will have no effect on the database
       transaction.
   o Transactional messaging off—In this mode, there is no relationship between the database transaction in ASE
       and interaction with the message bus. Transaction rollbacks in ASE do not undo work done on the message
       bus, and message bus errors do not rollback ASE database transactions.
  • Contents (“payload”) of message can be text, binary or XML.
  • Bi-directional interface. ASE can publish/send messages or subscribe/receive messages.
  • Code-free. Sybase Real-Time Data Services eliminates the need for custom-coded interface applications.

  Native messaging support:

  • ASE 12.5.2 and above for TIBCO EMS
  • Sybase ASE 12.5.3a and above for IBM WebSphere MQ




Figure 1. Messages Published from ASE to Message Bus




                                                                                                                     5
    CONFIGURATION 2: ANY DATABASE TO ANY MESSAGE BUS THROUGH SYBASE REPCONNECTOR

      This configuration leverages the RepConnector and Replication Server components of Sybase Real-Time Data
    Services to connect heterogeneous databases to heterogeneous message busses. This configuration can be used to
    capture events from any version of Sybase ASE, Oracle, IBM DB2 and Microsoft SQL Server, and make the data available
    in XML format to downstream applications via JMS, IBM WebSphere MQ or TIBCO Rendezvous.

      In the example shown in Figure 2, events are published from different database systems to a number of
    applications. Inventory management is running on Sybase ASE. A customer relationship management (CRM)
    application is running on an Oracle database, and a manufacturing quality control system running on IBM DB2.

      This configuration supports, TIBCO RV or JMS as the message backbone. A business activity monitoring (BAM)
    application requires real-time notification of critical events from all three of the source databases. The customer event
    management application enables the organization to notify customers proactively based on critical events. The
    organization may also want to notify a customer if they have been shipped an item that has been flagged as
    defective in the quality control system. An Operational Data Store (ODS) is updated in real-time from all three of the
    source systems. In this example, Sybase Real-Time Data Services is used to capture events from heterogeneous
    databases and to publish the events in real time over a message bus.

      The strengths of this configuration of Sybase Real-Time Data Services include:

      • Support for heterogeneous databases. The use of Replication Server allows capture of database events from
        Sybase ASE, Oracle, IBM DB2 and Microsoft SQL Server.
      • Support for multiple messaging systems. The use of RepConnector enables sending data to other applications
        and systems via TIBCO Rendezvous, Tibco Active Enterprise, Tibco Enterprise Message Service (JMS), Sybase
        EAServer JMS, Sonic MQ (JMS), WebLogic JMS or any J2EE JMS 1.1 compliant message system. Organizations can
        leverage existing messaging infrastructures.
      • Capture of events on the source system is non-intrusive. Real-Time Data Services obviates the need for polling
        applications, database triggers, or shadow tables on the source database.
      • Proactive. Real-Time Data Services captures changes from the source database, and proactively pushes the events
        via a message bus.
      • Code-free. Real-Time Data Services eliminates the need to develop custom-coded interface applications.

      The primary limitations of this configuration are:

      • The message payload from RepConnector is XML. Sybase Unwired Orchestrator, an optional component of Sybase
        Real-Time Data Services, can be used to enrich and transform to support other message payload formats.
      • Message bus operations and database transactions are independent. Events are captured and published when
        the database transaction successfully completes.




                 Inventory Management
                   (Sybase ASE – any version)                                                    Business Activity
                                                                                                Monitoring System
                                                                             Message Bus




                                                     Sybase
                                                   Real-Time
                                                  Data Services
                    CRM Application
                            (Oracle)                                                         Operational Data Store
                                                                                             (Controlled Real-Time Reporting)
                                                RepServer   RepConnector




                    Inventory Control                                                      Customer Event Management
                           (IBM DB2)




    Figure 2. Sybase Real-Time Data Services — “Any Database to Any Message Bus”

6
  Use Case: Telecommunications. Mobile phone operators need to know when a new subscriber makes the first call
after activating a plan. When this happens, the operator can can proactively configure services via SMS or messaging
and improve customer service. The operator can potentially generate additional revenue by notifying the customer of
additional services such as e-mail, chat features or mobile web browsing, and the customer can select and configure
the desired features directly from their phone. All of this depends on proactive notification that a plan has been
activated and the first call has been made. With Sybase RTDS, the database is configured to send a message over a
message bus the moment a plan has been activated and the first call made. The application consuming the message
can instantaneously alert an operator or automatically generate an SMS message to the subscriber.




CONFIGURATION 3: SYBASE REAL-TIME DATA SERVICES IN CONJUNCTION WITH ENRICHMENT AND
TRANSFORMATION

  Certain situations require that messages be transformed into different formats before they can be processed by the
consuming application. This typically involves the development of custom transformation applications either as a
central transformation application or built into the consuming application. Sybase Unwired Orchestrator eliminates
the need for such applications. Sybase Unwired Orchestrator offers rich transformation, enrichment, and routing
capabilities for messages. Sybase Unwired Orchestrator has the capability to consume from, and deliver to, any
message bus. Sybase Unwired Orchestrator can also connect to databases, email systems, and pagers.

  Sybase Unwired Orchestrator can be used with any of the above three configurations detailed above to provide
additional transformation, routing, and enrichment without developing custom applications. Messages are consumed
by Sybase Unwired Orchestrator from the message bus, transformed using rules and routed to their destinations. All
of this is achieved without coding. The use of Sybase RTDS with Sybase Unwired Orchestrator for enrichment and
transformation is illustrated in Figure 3.




      Inventory Management
        (Sybase ASE – any version)
                                                                                                Operational Data Store
                                                                                             (Controlled Real-Time Reporting)
                                                                        Message Bus




                                          Sybase
                                        Real-Time
                                       Data Services
         CRM Application                                                                              Customer Event
                 (Oracle)
                                                                                                       Management
                                     RepServer   RepConnector




          Quality Control
                (IBM DB2)




                                                                                                                                Real-Time
                                                                                        Message Bus




                                                                                                                                Sales Force
                                                                                                                                Automation


                                                                                                                                Real-Time
                                                                  Sybase Unwired                                                Notifications
                                                                   Orchestrator

                                                                (Transform and Route)




Figure 3. Sybase RTDS for Real-Time Capture and Flow with Sybase Unwired Orchestrator for Enrichment and Transformation




                                                                                                                                                7
TECHNICAL SPECIFICATIONS            CONCLUSION
Sybase Real-Time Data Services is       Market forces and customer requirements are driving businesses to improve their efficiency. To do so, organizations
available on the following          are looking to leverage the information assets contained in mission-critical, transaction processing applications. The
platforms: Sun® Solaris, HP-UX,     primary goal is to make the information in these application available to other applications in a timely, efficient
IBM AIX, Windows, Linux and is      manner. Sybase Real-Time Data Services provides all of the necessary components to:
able to publish events to the
                                        • Capture database events from operational databases in Sybase ASE, Oracle, IBM DB2 and Microsoft SQL Server.
following messaging systems:
TIBCO Enterprise Message Service,       • Enrich and transform the data captured from the operational database, including converting it to XML.
TIBCO Rendezvous, IBM                   • Write the data to a message bus. RTDS supports TIBCO JMS, TIBCO Rendezvous, TIBCO Active Enterprise, IBM
WebSphere MQ, SonicMQ JMS,                 WebSphere MQ, Sonic MQ JMS, Sybase EA Server JMS, BEA WebLogic JMS or any JMS 1.1 implementation. Sybase
Sybase EA Server JMS, BEA                  RTDS supports both “point-to-point” and “publish/subscribe” methods for sending and receiving messages.
Weblogic JMS, any JMS 1.1               • The change capture is log-based. It does not use polling applications or shadow tables. This minimizes the
implementation.                            impact on the operational system.
                                        • Real-time information flow is achieved easily and cost-effectively, without writing code.
A minimum of 1 CPU with 256 MB
of available memory is
                                        Sybase RTDS transforms your Sybase ASE, IBM DB2, Oracle, and Microsoft SQL Server databases from passive data
recommended to deploy Sybase        stores (from which applications pull information) into active, event-driven databases that push critical information to
Real-Time Data Services.            the applications and people that need it via today's real-time messaging infrastructures.




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www.sybase.com                      without notice. L02563 09/05

				
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