Modified on by DavidT
With a mere 4 weeks until IBM's 2013 Information on Demand, the data replication team thought it might be helpful to have a complete listing of all data replication sessions at IOD. From client presentations and our product roadmap to sneak peeks at new IBM Data Replication functionality, our sessions run the gamut!
Simply take a gander at the sessions below then go to the IOD agenda builder, click on Create Sign In, and then enter your confirmation number and the email address that you used to register for the conference. Create your agenda today!
The absolute best answer to this question is in the IBM Distributed Software Licensing Reference Guide. It can be downloaded from the Passport Advantage Licensing home page on ibm.com
(see picture below). The document contains a general discussion about Hot, Warm, and Cold Standbys for IBM distributed software. While it does not mention IBM InfoSphere Data Replication (IIDR) specifically, the discussion applies to IIDR because IIDR does not have its own unique license terms in regards to standby servers. If you read the guide and have a question in relation to IIDR, feel free to post it in the comment section of this blog entry.
The following is an excerpt from that document as of the date of this post. It's just here just to give you a feel for what to look for in the Reference Guide. You shouldn't view this post as a replacement for reading the Guide since the Guide could change .
A new WebSphere MQ enhancement may give Q Replication a significant throughput boost in those situations where you have either (1) workload spikes that increase replication latency or (2) changed data that has built up in queues because of the temporary unavailability of a target database. The new feature is tailored for the sequential access of messages and causes MQ to read messages into the MQ buffer before the messages are needed. This method lets both the Q Apply program and MQ channel agents pull messages from memory instead of disk.
Why is this possible? When the number of messages overruns the buffer pool allocation for the queue, messages are spilled to disk and must then be retrieved from disk when needed. With the read-ahead enhancement, messages can be in memory. In addition to greatly improving throughput in these situations, the enhancement lowers overall replication latency. This new MQ feature also benefits performance at the source transmission queue.
In our test, we achieved the 55 percent increase in rows per second processed by Q Apply on a DB2 for z/OS Version 9 non-data sharing system with Q Replication Version 10.1 and WebSphere MQ Version 7. The average message size for the test was 50K. We have observed significantly higher improvements in replication throughput with smaller messages, for example 10K. Your throughput numbers could be noticeably different from these because replication performance can be heavily influenced by environment, row lengths, replication configuration, and more.
The buffer pool read ahead enhancement is available starting with WebSphere MQ V7 APAR PM63802. You can enable the function by issuing the following MQSC command:
RECOVER QMGR(TUNE READAHEAD ON)
You can add the read ahead function to both the source and target queue managers for optimal performance. No changes are required to your Q Replication environment to take advantage of this feature.
For more information, see the text for APAR PM63802
I've gotten this question a lot lately. It's usually from people who want to move from DB2 ESE to DB2 Advanced ESE (AESE). They want an answer from both a technical perspective (will I need to migrate?) and a licensing perspective (do I still need my current replication product?). The answer to these questions, like the answer to so many other questions, is :) "it depends." I'll use this post to cover the points from both perspectives.
You need to answer one question - are you changing versions of DB2 when you upgrade to DB2 AESE? For example, are you moving from DB2 ESE 9.7 to DB2 AESE v10? If the answer is, no, you are not changing your DB2 version, then the answer to the Q Replication question is, no, Q Replication is not affected by the upgrade to DB2 AESE. This is because AESE changes DB2 license terms related to Q Replication, not the DB2 install, the Q Replication code, or the DB2 function that Q Replication uses.
On the other hand, if your answer is, yes, you are changing DB2 versions, then the change will likely require a migration of Q Replication. To know for sure, you need to consider whether you're using the copy of Q Replication in your DB2 install or a separate copy of Q Replication that was installed through a product such as InfoSphere Replication Server (IRS) or IBM InfoSphere Data Replication
- The other case is that the you installed a separate copy of IRS or IIDR and are using the Q Replication in it to work with your DB2 instance. For this case, the Q Replication code only needs to be upgraded if it is capturing changes from DB2 v10 (applying changes to DB2 is not affected). Again, see the DB2 v10 Information Center for information about upgrading/migrating Q Replication.
One of the major benefits of upgrading to DB2 AESE is that you get two- or three-site Q Replication at no additional cost. That's important to licensing because, before DB2 AESE, you had to purchase Q Replication for DB2 through one of three products - the IBM Homogeneous Replication Feature (HRF), InfoSphere Replication Server (IRS), or IBM InfoSphere Data Replication (IIDR). The question is - do you still need to maintain a license for a data replication product? The answer depends on the configurations you've built with Q Replication. Specifically, the DB2 AESE license covers your current Q Replication needs for a given DB2 AESE server if you are using the Q Replication in DB2 AESE and one of the following is true:
- Your DB2 AESE server is 9.7 and you are only replicating with one other DB2 LUW server (of any release).
- Your DB2 AESE server is v10, and you are replicating with no more than two other
DB2 LUW servers (of any release).
In the past, IBM always announced a new release of its Replication Server product on UNIX and Windows whenever it announced a new release of DB2 LUW. If the version changed, IBM also updated the version of Replication Server on z/OS. Neither of those changes happened when DB2 LUW v10 was released. What's more, IBM announced in late 2012
that its older data replication products, including Replication Server, would no longer being marketed. So, why's IBM doing this? And what happens to Replication Server's Q and SQL Replication?
Well, over the years, IBM provided its data replication technologies
through a lot of different products. For example, IBM had two major data replication products at the same time for several years - InfoSphere CDC and InfoSphere Replication Server. That was a little confusing,
even to some IBM people. To simplify sales, IBM consolidated all it's replication technologies into a single product called IBM InfoSphere Data Replication
(IIDR). This means that IBM didn't need to continue offering those technologies through the older products (InfoSphere CDC and InfoSphere Replication Server).
- Are the older products still being supported?
- Is IBM still providing the IIDR's Q and SQL Replication at no cost in certain DB2 LUW and InfoSphere Warehouse (ISW)?
- How do you upgrade from your old Replication Server on UNIX or Windows to IIDR?
- How do you upgrade your Replication Server on z/OS to IIDR?
If you have any questions, feel free to post them in the comments section of this blog.
Over the years, IBM has provided its data replication technologies through a lot of different products. That can be a little confusing, even to some IBM people :) So, to simplify things, IBM has consolidated it's replication technologies into a single product
. It's called IBM InfoSphere Data Replication (IIDR). To go along with that, IBM is also reducing the number of products it uses to sell those technologies. That affects the IBM Homogeneous Replication Feature (HRF) for DB2.
To be clear, the HRF was an alternate way to buy Q Replication
for DB2 LUW and InfoSphere Warehouse (ISW), 9.5 and 9.7. That is no longer available for new purchases. The same is true for v10. The affect on you depends on whether you are (1) new to Q Replication with DB2/ISW or (2) an existing 9.5 or 9.7 HRF customer:
- If you are new to Q Replication, you have two choices:
- Upgrade to DB2 Advanced ESE (AESE) or ISW. This the best alternative if all of your replication is between
DB2 LUW and/or ISW servers and your configuration meets requirements. For more information, see the post titled Is Q Replication Free?
- Purchase IIDR*. You will need IIDR if your DB2 LUW replicates with DB2 z/OS, a heterogeneous source or target (e.g., Oracle), or with more sites than allowed by DB2 AESE or ISW.
- If you are an existing HRF customer, you can still buy support ("S&S") for it and activate in DB2 LUW v10. You also have the option of trading up to the full IIDR product. You can do this with a special trade-up feature (part number D0P64LL) that was added to IIDR in its 10.1.3 announcement.
* Alternatively, InfoSphere Replication Server (IRS) is still available for use with DB2 LUW 9.5 and 9.7. However, IRS is not available for DB2 LUW v10. You must use IIDR with DB2 LUW v10.
I recently posted a white paper on developerWorks
and a blog on ChannelDB2
that talk about using Q Replication with HADR. One obvious follow-on question is the title of today's post. People want to know what they need to purchase to be in compliance with IBM license terms* when they use Q Replication with HADR.
The best answer is found in the IBM license information document for the product that provides you Q Replication (remember that Q Replication comes in several different IBM products). These documents are maintained on ibm.com. However, most people don't know how to navigate them :) so I'll provide links to the most current (as of this post) for each product** and my reply. I'll also use the following picture. It came from the previously-mentioned white paper and blog.
Replication Server has Hot, Idle/Warm, and Cold Standby terms as do DB2 and InfoSphere Warehouse. Data replication products cannot process transactions on an HADR secondary. That means the HADR secondary is a Cold Standby from Replication Server's perspective. You need to purchase Replication Server for the HADR primary, but not the secondary.
IBM InfoSphere Data Replication (IIDR) 10.1 is a packaging of InfoSphere CDC and InfoSphere Replication Server
. The IIDR license basically says that it provides unrestricted use of these two products and that the terms in those licenses apply unless overridden by IIDR's. In the case of HADR, the Replication Server Hot, Idle/Warm, and Cold Standby terms apply to Q Replication. That means you have the same answer that I wrote for Replication Server above: Data replication products cannot process transactions on an HADR
secondary. That means the HADR secondary is a Cold Standby from
Replication Server's perspective. You need to purchase Data Replication for the HADR primary, but not the secondary.
If you have questions, feel free to post them to the message board of this group.
While it's true that DB2 z/OS v7 has been out of service since 2008
, that doesn't mean no one's using it :) We know because we regularly get questions about whether any IBM data replication product still supports it. Some people want to use replication as a database migration tool (e.g., for moving from for DB2 v7 to DB2 v9). Others just want a typical data replication solution such as copying data to another system for reporting purposes. Whatever the situation, IBM provides WebSphere Replication Server for z/OS v9 (5655-R55) to support DB2 z/OS v7
. You can use either Q or SQL Replication*. These are both compatible with with the Q and SQL Replication found in newer versions of IBM replication products. For example, you could replicate data between DB2 z/OS v7 and DB2 z/OS v10 by having WebSphere Replication Server v9 running with DB2 v7 and InfoSphere Data Replication v10 running with DB2 v10. Here's a picture of what that looks like:
Note that IBM's newest replication product, InfoSphere Data Replication for DB2 for z/OS v10
, does not support DB2 z/OS v7. The same is true of latest versions of InfoSphere Replication Server for z/OS and InfoSphere Change Data Capture for z/OS, both of which are part of the new Data Replication product. Neither support DB2 z/OS v7.
* Both Q and SQL Capture work with z/OS V1.4 as well.
No, not if you have InfoSphere Data Replication
or InfoSphere Replication Server on UNIX or Windows. On those operating systems, Data Replication and Replication Server contain a complete set of IBM's data federation technology for use in data replication solutions*. For example, you can replicate to a PostgreSQL
or an Oracle database using the Federation Server technology found in the Replication Server install. If you have any other data replication product, you may be able to use a copy of Federation Server to go to target databases not supported by that replication product. You'd need to work with an expert for that product to know for sure. Note also that, if you have Federation Server, the Federation Server license
does not allow general use of the replication components found in Federation Server. That replication technology can only be used in support of building a database cache using cache tables
* Data Replication and Replication Server solutions for mainframe data sources such as IMS and VSAM (called 'Classic' data sources) require a 'Classic' data replication product instead of data federation. Therefore, the mainframe federation technology for Classic data (Classic Federation Server) is not included in the purchase of Data Replication or Replication Server on UNIX or Windows.
A few posts back, I answered the question "Is Q Replication Free?
" Or, at least I thought I did :) To clear up some lingering confusion, people have asked me to give examples of when they need to buy Q Replication for DB2 Advance Enterprise Server Edition (AESE) and InfoSphere Warehouse. I'll do that in this post using these examples:
- Replicating between DB2 AESE and DB2 z/OS
- Replicating between DB2 AESE and DB2 ESE or Workgroup Edition
- Running replication in a peer-to-peer topology with three DB2 AESE servers
All examples are applicable to InfoSphere Warehouse in addition to DB2 AESE. In other words, you can substitute "InfoSphere Warehouse" wherever you see "DB2 AESE." If you have DB2 v10 servers, you get more no-cost Q Replication than was available in 9.7. This examples highlight this where applicable.
Replicating Between DB2 AESE and DB2 z/OS
You must buy IBM InfoSphere Data Replication
(IIDR)*. You cannot use DB2 AESE's no-cost Q Replication to replicate with DB2 z/OS. For example, that is the case with the case in the following picture where you have one DB2 AESE replicating with DB2 z/OS:
However, you may be able to extend this topology in such a way that DB2 AESE's no-cost Q Replication could be used for the extension. For example, let's say you want to add another DB2 AESE that replicates with your original DB2 AESE. You still have to purchase IIDR for the original systems (systems #1 and #2 in the picture below), but you can use DB2 AESE's no-cost Q Replication for the new system (system #3) because it only replicates with one other DB2 LUW.
Replicating Between DB2 AESE and DB2 ESE or Workgroup Edition
You can use DB2 AESE's no-cost Q Replication to replicate between a given DB2 AESE and any other edition of DB2 LUW. However, the following requirements must be met:
- The no-cost Q Replication in DB2 AESE can only be used to replicate with up to two other DB2 LUW servers if DB2 AESE is v10 or one other DB2 LUW server is the DB2 AESE is 9.7.
- IIDR must be purchased for DB2 editions other than AESE.
For example, say you have the following topology. In it DB2 AESE v10 is on system #2 and replicates with a DB2 ESE on system #1 and a DB2 Workgroup Edition on system #3. You can use the AESE no-cost Q Replication because it only replicates with two other DB2 LUW servers. IIDR must be purchased for systems #1 and #3.
Running Replication in a Peer-to-Peer Topology with Three DB2 AESE Servers
For me, this is the case that justifies upgrading your AESE from 9.7 to v10. For DB2 LUW 9.7, you must buy IIDR for DB2 AESE if your DB2 AESE replicates with more than one other DB2 LUW server:
With DB2 AESE v10, you can use the no-cost Q Replication fro all three DB2 servers:
Free free to post questions if you have other topologies you're interested in.
This post is not
about whether you need some kind of event publishing* function for DB2. It's about whether you already have the function found in InfoSphere Data Event Publisher and just don't know it.
InfoSphere Data Event Publisher is built from IBM's Q Replication technology. More specifically, it provides a subset of the function found in the Q Capture program. The question is, if event publishing is a subset of Q Capture and I already have Q Replication, do I need to buy Data Event Publisher? The answer is almost always no. Why "almost always"? Q Replication is found in several IBM products and features
. For example, no-cost, two-site Q Replication
was recently added to certain editions of DB2 and InfoSphere Warehouse. Some of these products have license restrictions on how Q Replication function can be used. I have the products listed here along with the answer about whether you need to buy Data Event Publisher with it:
- InfoSphere Data Replication or InfoSphere Replication Server - No.
- You do not need to buy Data Event Publisher. The function is included in all Replication Server products. This is true for z/OS and LUW. The LUW product can publish from Oracle sources as well.
- The IBM Homogeneous Replication Feature - Maybe.
- Event publishing for DB2 databases is included. However, if you want to publish from Oracle sources, you must buy either InfoSphere Data Event Publisher of InfoSphere Replication Server.
- The free two-site Q Replication in DB2 and InfoSphere Warehouse - Maybe.
- Event publishing can only be used to set up replication of data from one DB2 LUW database to another. If you want to publish changed data for any other destination, you must buy either InfoSphere Data Event Publisher or InfoSphere Replication Server.
Wait... what? I can do replication with Q Capture's event publishing? Yes :) but the primary reason you would consider this is when you want to run data through a transformation engine such as InfoSphere DataStage and don't want to run an apply program at the target or stage data in tables or files. The following picture shows an example of what I mean:
* For those of you who aren't sure what data event publishing is, it's function that lets you capture changed data from a database log and publish it to consuming applications. The format of the published data is such that you can determine transaction boundaries, see the SQL operations (insert, update, delete) as well as the order they occurred, and have both before and after values for updates. Depending on the tool you use, data can be published to relational tables, WebSphere MQ, or flat files. The consuming app (or apps) can be one you develop such as for SOA or an off-the-shelf app like InfoSphere DataStage.
This post focuses on publishing to WebSphere MQ queues because that's what's found in InfoSphere Data Event Publisher.
(Oh, I can hear the outcry now... people saying that no one's ever used the term event publishing when the destination is tables or files. Seriously? Those are just staging mechanisms. They don't change the end result. You still get data events published. And those events are still available to consumers. For comparison, see the IOD 2010 presentation about providing changed data to InfoSphere DataStage via tables
I've been surprised recently by the number of people who still have an old IBM product called DataPropagator, or 'DProp'. More suprising is that they think they're at a dead end with no replacement. Nothing could be further from the truth. DataPropagator was a product name. Product names, as I'll show later, can change. However, the underlying technology remains. In DataPropagator's case, the technology inside it is what IBM calls SQL Replication. SQL Replication is alive and well. You can find it in several IBM products
For example, if you're on z/OS and currently running DB2 DataPropagator or DataPropagator Relational, the DProp function can now be found in the SQL Replication feature of WebSphere Replication Server v9.1 and InfoSphere Replication Server v10 as well as IBM's newer InfoSphere Data Replication product
. This is important information because, if you move to DB2 z/OS v9 or v10, you must upgrade to one of these newer replication products because they contain the only level of DProp function that supports the newer DB2s.
Getting back to the subject of name changes, here is a graphic that shows the transformation of 'DProp' names on z/OS.
What If You're Current on S&S?
You may want to know what you're entitled to if you had purchased DataPropagator and are current on S&S. The easy thing to do is to search IBM announcement letters
for 'datapropagator'... okay :) maybe it's easier said than done, so here's the ones that answer the question:
- IBM Withdrawal Announcement 908-016
- IBM Software Announcement 206-224
In a nutshell, they say that DataPropagator (v7 and v8) have been replaced by WebSphere Replication Server. v9. Of course, in 2010, v10 of Replication Server was released and its brand was changed to InfoSphere. Customers can move to Replication Server v10 if they are current on DataPropagator S&S.
The following lists add some comments about what else changed for each of these name changes:
This product replicated between DB2 databases.
A companion product, DataPropagator NonRelational, replicated data from IMS to DB2.
A little later, IBM's data federation product, DataJoiner, provided the basis for heterogeneous SQL Replication between DB2 and other relational databases.
This was the start of a new, improved implementation of SQL Replication.
The NonRelational product was renamed to IMS DataPropagator.
If anyone knows of anything I missed, feel free to add it to the comments :)
Yes, a limited-use copy of WebSphere MQ comes with all products that license use of Q Replication. "Limited-use" of MQ simply means that you can only use this copy of MQ with Q Replication. However, some products allow a few other things, too. For example, most DB2 LUW and InfoSphere Warehouse editions bundle MQ because DB2 LUW has a several integration points with MQ, not just Q Replication.
Do you have to use the bundled copy of MQ? No. If you already have a fully licensed copy of MQ, Q Replication will work with that. The one thing to remember is that a best practice is to have dedicated queue managers for Q Replication. In other words, create new ones, don't use queue managers that have other work going through them.
For UNIX and Windows, do you have to install the WebSphere MQ server software on the same system as where Q Replication is installed?
No. The MQ server software can be installed on a different system and queue managers created there. Q Replication will access those queue mangers through MQ client software installed on the same system as Q Replication. However, for optimal performance, queue managers should be co-located on the same system(s) as Q Replication. For those of you who want an example of what's allowed, here's one :)
For z/OS, are there any special considerations? Yes, but only for how you order the bundled copy that comes with a z/OS product. See the last heading of this post for ordering information.
How do you verify everything I just said about licensing? :) Check the IBM license information documents. They are the official and final word about what you're entitled to. In fact, what they say overrides anything anyone says in a blog :) You can find IBM license information documents on ibm.com by using IBM's search interface:
Software License Agreements Search
Simply enter the product name and date, then follow the on-screen instructions. To read the MQ related terms, search for the string 'MQ'. Here are links to two license information documents that tend to be of interest to people:
InfoSphere Replication Server 9.7
You may want to use a date range to limit the results returned.
Ordering Considerations for z/OS
If you plan to use the copy of MQ that comes with InfoSphere Replication Server v10 for z/OS, please note that Replication Server is in Shopz's DB2 zone and the bundled WebSphere MQ is in Shopz's MVS zone. For example, Shopz will show something like the following in the DBS DB2 group/zone:
Shopz will show something like the following for MQ in the MVS group/zone:
Modified on by DavidT
IBM offers a lot of flexibility with its data replication technologies (CDC, Q Replication, and SQL Replication). As a result, we get a lot of questions about what's needed under various circumstances. This post is a collection of links to answers for the most common questions I get asked. Of course, as you read these, remember that IBM's license documents are the final word on what's allowed. If there's ever a conflict between them and what's posted here, the license document win :)
Note: After the links, I also have a little background about why flexibility drives these questions.
We don't have a lot, but I divided them by headings to make them easier to navigate visually.
What Do I Get for Free?
How Does Upgrading Work?
What Do I Need...?
What Replaces Old Products?
If you have any suggestions for questions to add, feel free to use the comment section of this blog.
I regularly get some variation of the following three questions:
Which products contain IBM replication technologies?
What happens if my source and target have different levels of software?
What do I need to get for my particular configuration?
To determine or understand the answers, you may need a little background related to three areas of flexibility. First, you can get IBM's data replication technologies a number of ways:
In a stand-alone product.
As a feature of selected products.
Included at no additional charge in selected products.
Second, IBM data replication technologies allow a lot of differences between source and target systems:
The source's operating system can be different from the target's (e.g., AIX vs Windows).
The source database can be different from the target database (e.g., DB2 z/OS vs InfoSphere Warehouse).
The source's software can be at a different version and release than that of the target. This includes:
The replication software
Third, IBM data replication technolgies offer a number of ways they can be set up:
Capture can often be run remote from the source when the source and capture run on Linux, UNIX, or Windows.
Apply can run remote from the target.
A single install can access many sources and targets.
The links in this post help you navigate the options.
In October 2010, IBM announced a new edition of DB2 called DB2 Advanced Enterprise Server Edition (AESE). In the same letter, IBM announced that two-site Q Replication is now provided at no additional cost in DB2 AESE and all editions of InfoSphere Warehouse. While this started with 9.7, it is continued and enhanced in v10. This great news for customers who want to use data replication as the basis for a DB2 high availability (HA), disaster recovery (DR), or active-active solution. (If you're not familiar with Q Replication for availability, see the video on ChannelDB2).
So, what are you really entitled to? The license is the final word, but, in simple terms, the bundled Q Replication can only be used at no cost when a 9.7 DB2 LUW data server (an instance*) is replicating data with only one other DB2 LUW server**. Or, if your DB2 data server is v10 instead of 9.7, it can replicate with up to two other DB2 LUW servers**. That applies to the DB2 LUW in InfoSphere Warehouse and the InfoSphere Warehouse in either the Smart Analytics Systems or the PureData System for Operation Analytics. For example, you could use the free Q Replication in the following bidirectional replication configuration:
The question is - do you ever need to buy Q Replication now? If you're doing anything more than what's described in this post, then, yes, you'll need to buy Q Replication for DB2 AESE and InfoSphere Warehouse (ISW). The two most common replication configurations that require this are ones where you:
- Replicate between DB2 LUW or ISW and either DB2 z/OS or Oracle
- Have a primary server more secondary or standby servers for HA or DR than Q Replication is licensed for.
- In other words, you have a 9.7 primary that replicates to more than one secondary/standby or a v10 primary that replicates to more than two, which are common with time-delayed standbys.
Not Found in Passport Advantage?
People often look for a Q Replication product under DB2 ESE or InfoSphere Warehouse in Passport Advantage. For example, they look for the DB2 Homogeneous Replication Feature
or InfoSphere Replication Server under the DB2 AESE eAssemblies. They won't find one because it's not needed. To be clear, you do not need anything from Passport Advantage to be able to run the Q Replication found in DB2 AESE and InfoSphere Warehouse. Q Replication should run out of the box in these products without a Q Replication install or a Q Replication license enablement (.lic) file. In other words, you should be able to run Q Capture and Q Apply without them giving you an error that a license is required.
* Multiple DB2 instances can be created from a single DB2 install. Each instance can use the bundled Q Replication to replicate up to the entitled number of other instances.
** The version and edition of the other DB2 LUW server(s) does not matter.