Question

Database replication theory

Asked by: mocarts

hi everyone :)
do someone know links to useful docs (it can be tutorial, specs, discussions) about subject?
something I know but I want to be sure I know as much as possible, because I have to write some hybrid, configurable, RDBMS independent replication system.

mo.

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Asked On
2003-06-10 at 14:51:35ID20643665
Tags

theory

,

replication

,

database

Topic

Databases Miscellaneous

Participating Experts
2
Points
125
Comments
6

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Answers

 

by: crescendoPosted on 2003-06-10 at 15:01:57ID: 8694864

Independent? Is this theoretical stuff? Why re-invent the wheel when every major RDBMS has replication built-in, in several flavours, with GUI interfaces?

 

by: angelIIIPosted on 2003-06-11 at 02:37:25ID: 8697851

There are several points:
* independant: will the replication between the same systems or cross-systems (ie can the replication always be between the same RDMBS types (A->A, B->B), although supporting different types, or replication from type A to type B)?
Note that for A->A you have already everything in place, why try to write something as complex as replication to be independant, and finally BAD in performance.
For A->B, you will FAIL miserably as each RDBMS has it's own specifics, with more and more for each version. You will end up upgrading your application to take care of all the possiblities. Leaving items out will make your tool be thrown to the dustbin quite fast...

Now, the above is my opinion, and I know that a true DBA will never be able to trust a tool that pretents to replicate between ANY rdbms type to another one, and won't even give it a try as the own one works fine...

CHeers

 

by: mocartsPosted on 2003-06-12 at 04:27:53ID: 8707640

hi, all who answered :)
first - sorry for the delay - I have much to do (and read :)
we have a large application which can run on MSSQL (or MSDE) or Oracle. there is more than 1000 users of this app and potentially 10% will be interested in using this future (i.e. replication or synchronization). there aprox. 200 tables per DB.

why I suggested to create some custom mechanism?
1. I'm not sure how servers will deal with shema upgrades (at least SQL server will add their own columns and triggers for each involved table) if table is dropped or recreated - how will the server deal with it?
2. It's not reasonable to create (and support!) systemwide (for all data) replication -
  3. we want to let the users to determine what data they want to replicate
4. If I know something about MSSQL server replication, then Oracle is black-box for me mostly :)

angel, we don't pretend to develop tool for distributing it - we want to integerate it within our app. we have a strong limitation on data types we use - so we can map them to apropriate "other" server types. and yes, that is possible to have Oracle as MasterDB and MSDE as SlaveDB (for notebooks, for example)


I know that I don't know :) and there can be wrong thougths above - that's why I'm here asking for your help :)

mo.

 

by: crescendoPosted on 2004-04-05 at 15:02:52ID: 10761481

I'm happy for AngelIII to get the points.

However the answer, now that we have additional information  is that  MSSQL to Oracle replication is built-in and he should look in SQL Server Books Online under 'heterogeneous data sources'. Replication is always a pain in the neck to administer and needs to be managed by a DBA, not left to the users.

 

by: mocartsPosted on 2004-04-06 at 00:16:23ID: 10763597

Hi, all :)
I have accepted angelIII answer because of most information contained, but not most useful, as I asked for some background, theoretical information (links, docs etc.)
crescendo got the points for interesting information :)

but all this is a bit too late because I have alreadey developed the solution (at BL level).
anyway thanks :)
wbr, mo.

20120131-EE-VQP-002

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