IBM InfoSphere Replication Server and Data Event Publisher by Pav Kumar Chatterjee

By Pav Kumar Chatterjee

It is a developer's consultant and is written in a method appropriate to execs. The preliminary chapters hide the elemental conception and rules of Q replication and WebSphere MQ. because the publication advances, a variety of real-world eventualities and examples are coated with easy-to-understand code. the data won in those chapters culminate within the Appendix, which includes step by step directions to establish numerous Q replication situations. while you are a qualified who must manage and administer a Q replication or occasion Publishing atmosphere, then this can be the e-book you would like. The e-book offers you a transparent concept of the way to enforce Q replication on z/OS even if you're employed on Linux, Unix, or home windows working procedure.

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Extra info for IBM InfoSphere Replication Server and Data Event Publisher

Sample text

29 ] Q Replication Overview Note the following: • MQ installed on RED01 • Replication control tables created on partition 0 • Q Capture and Q Apply run on RED01 • EXPLAIN tables defined on RED01 Tables with referential integrity The first design point deals with tables, which have referential integrity. We need to ensure that all related parent and child tables are on the same partition. If we do not do this and start replication, then we will get ASN7628E errors. Table load and insert considerations If we want to load from the application, then the staging table should be partitioned similarly to the detailed table so that we can make use of collocation (therefore, we need the same partition group and same partition key).

It also contains commit information for the transaction. Informational messages: There are six informational messages and they describe the action being transmitted: °° Add column: This contains information about a column that was added to an existing subscription. °° Error report: This tells the user application that Q Capture encountered a publication error. °° Heartbeat: This tells the user application that Q Capture is still running when it has no data messages to send. °° Load done received: This acknowledges that Q Capture received the message that the target table is loaded.

We do not need to be able to identify unique rows on the source table, but we do need to be able to do this on the target table. Therefore, the target table should have one of: • Primary key • Unique contraint • Unique index If none of these exist, then Q Apply will apply the updates using all columns. However, the source table must have the same constraints as the target table, so any constraints that exist at the target must also exist at the source, which is shown in the following diagram: [ 34 ] Chapter 2 The WebSphere MQ layer This is the second layer we should install and test—if this layer does not work then Q replication will not work!

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