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Can C driver in apps patch create Invalid Object in database ?

No , C driver only copies files in File System. Database Object might be invalidated during D driver when these objects are created/dropped/modified.

What is dev60cgi and f60cgi ?

CGI stands for Common Gateway Interface and these are Script Alias in Oracle Apps used to access forms server . Usually Form Server access directly via http://hostname:port/dev60cgi/f60cgi

Why does a worker fails in Oracle Apps Patch and few scenarios in which it failed for you ?

Apps Patch worker can fail in case it doesn't find expected data, object, files or any thing which driver is trying to update/edit/modify. Possible symptoms may be underlying tables/objects are invalid, a prereq patch is missing , login information is incorrect, inconsistency in seeded data...

What is difference between mod_osso and mod_ose in Oracle HTTP Server ?

mod_osso is Oracle Single Sign-On Module where as mod_ose is module for Oracle Servlet Engine.
mod_osso is module in Oracle's HTTP Server serves as Conduit between Oracle Apache Server and Singl Sign-On Server where as mod_ose is also another module in Oracle's HTTP Server serves as conduit between Oracle Apache and Oracle Servlet Engine.

What is difference between COMPILE_ALL=SPECIAL and COMPILE=ALL while compiling Forms ?

Both the options will compile all the PL/SQL in the resultant .FMX, .PLX, or .MMX file but COMPILE_ALL=YES also changes the cached version in the source .FMB, .PLL, or .MMB file. This confuses version control and build tools (CVS, Subversion, make, scons); they believe you've made significant changes to the source. COMPILE_ALL=SPECIAL does not do this.

What is GSM in Oracle application E-Business Suite ?

GSM stands for Generic Service Management Framework. Oracle E-Business Suite consist of various compoennts like Forms, Reports, Web Server, Workflow, Concurrent Manager ..

Earlier each service used to start at their own but managing these services (given that) they can be on various machines distributed across network. So Generic Service Management is extension of Concurrent Processing which manages all your services , provide fault tolerance (If some service is down ICM through FNDSM and other processes will try to start it even on remote server) With GSM all services are centrally managed via this Framework.

What is FNDSM ?

FNDSM is executable and core component in GSM ( Generic Service Management Framework discussed above). You start FNDSM services via APPS listener on all Nodes in Application Tier in E-Business Suite.

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