Database client is must for GG??

Hi All,
Is Database client necessary for installing Oracle Goldengate?
Im going to configure GG in the same server where database is running.
Thanks,
Harry

All of the GoldenGate builds require database client software to be at least installed -- even if GoldenGate isn't connecting to a database -- except the version of GoldenGate that comes with the OGG Java or flat-file adapter. The adapters come bundled with a version of GoldenGate core called a "generic" (no-database) GoldenGate, which has no runtime dependencies on any database client. All the other database-enabled versions of GoldenGate (GG for DB2, GG for MySQL, GG for Oracle, etc) won't even be able to start "ggsci" or "extract", simply because the DB client runtime library dependencies are missing. This implies that the LD_LIBRARY_PATH (or, on Windows, PATH) needs to be correctly configured in order to run any version of GG that has database functionality -- even when you aren't using the database functionality.
If you have GG installed and it is just acting as a pass-thru pump (no transformations, mapping, user-exits, etc) -- then there's no reason for GG to access any database, since there's no need for metadata. A "generic" build of GG would be able to do this, but then so could any build of GG (as long as you have the DB client software installed... btw, Oracle instant client is useful for this.) And, btw, it's worth mentioning that the flat-file & Java adapter (for Java targets) can be plugged into any build of GoldenGate; they don't have to run in the "generic" no-database version of GG. (The JMS capture is the only component that requires the no-DB generic GG.)
If you have some mapping or transformations going on, then it's possible to use a "source-definitions" file instead of connecting back to the source datatabase for metadata. <ul>
<li> The downside of connecting back to the source-database for metadata is that the trail data may be from several minutes ago (or several hours ago -- or for test data, even weeks or months ago) -- so the metadata is out-of-sync with the trail data. Trail data is meaningless without correct & current metadata.
<li> The downside of source-def files is that they have to be updated whenever you update your DDL. (Source-defs files describe the trail data -- just like DDL does, but source-def's are GG's database-neutral metadata file format. These are generated via "defgen" on the source database.)
<li> if capturing DDL (only possible in like-to-like scenarios for Oracle-to-Oracle), then you won't be using source-def files. </ul>
(That was probably more detail than necessary ... : - ))
Hope it helps,
-m

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