I've received a few questions about text search in DB2 9 for z/OS lately, so I thought I'd share the basic information here.
Prior to DB2 9, there was an offering called "DB2 Text Extender". This was an early attempt at text indexing that runs on z/OS. It is dependent on some z/OS code called "Text Search". Later on, the team that worked on the extenders also released something called "DB2 Net Search Extender", aka NSE. DB2 for Linux, Unix, and Windows had a significant upgrade with NSE, but that same upgrade was not shipped for DB2 for z/OS. So DB2 for z/OS customers have not had a significant upgrade to text search since "DB2 Text Extender" in DB2 V7.
In DB2 9, there is a completely new text search solution. Text search is provided by a built-in engine function called CONTAINS. This solution requires an external text search server that runs on a Windows or Linux operating system, which is provided as part of the DB2 Accessories suite. It is not a direct replacement of Text Extender function, so applications and administration policies need to be updated for this change. The best source for detailed information about this is in the information center topic Administering IBM text search for DB2 for z/OS. And I have an earlier blog entry about the announcement.
What about the DB2 Text Extender? It's not available in DB2 9 for z/OS. That means you won't see an equivalent for DB2 V8 FMID JDB881C. And you won't need IBM Text Search FMID-HIMN230 in DB2 9 for z/OS either, because that was a prerequisite for the DB2 Text Extender.
The above is all specific to DB2 for z/OS. DB2 for LUW 9.5 FP 1 ships the same Omnifind text search server, and DB2 LUW still ships support for their NSE as well.
Now that we've got that all cleared up :-), next we'll evaluate some use cases for text search applicability.