SAP instance communication with Oracle processes

Can anybody please explain me how SAP instance communicate with Oracle processes ?
Also some details on OPS$, SID.ADM etc accounts - how they are created and communication between them.
Please provide some details to understand the basics. Appreciate if hyperlinks are given as I already a no. of links but able get the exact picutre on this.

Like to know some details on these OPS$ mechnism.
Found the following details in dev_w0 :-
kernel runs with dp version 232(ext=109) (@(#) DPLIB-INT-VERSION-232)
M length of sys_adm_ext is 364 bytes
M ***LOG Q01=> ThInit, WPStart (Workproc 0 122773782) [thxxhead.c   1281]
M ThInit: running on host sap<SID>
M calling db_connect ...
C Got LIBPATH=/usr/lib:/lib:/usr/sap/<SID>/SYS/exe/run:/oracle/client/10x_64/instantclient from environment
C Oracle Client Version: '10.2.0.2.0'
C Client NLS settings: AMERICAN_AMERICA.WE8DEC
C Logon as OPS$-user to get SAPSR3's password
C Connecting as /@<SID> on connection 0 (nls_hdl 0) ... (dbsl 700 250407)
C Nls CharacterSet                 NationalCharSet              C      EnvHp      ErrHp ErrHpBatch
C    0 WE8DEC                                                    1 112859e40 112865178 112864a28
C Attaching to DB Server <SID> (con_hdl=0,svchp=112862858,srvhp=1128674d8)
C Starting user session (con_hdl=0,svchp=112862858,srvhp=1128674d8,usrhp=112861c60)
C Now '/@<SID>' is connected (con_hdl 0, nls_hdl 0).
C Got SAPSR3's password from OPS$-user
C Disconnecting from connection 0 ...
C Closing user session (con_hdl=0,svchp=112862858,usrhp=112861c60)
C Now I'm disconnected from ORACLE
C Connecting as SAPSR3/<pwd>@<SID> on connection 0 (nls_hdl 0) ... (dbsl 700 250407)
C Nls CharacterSet                 NationalCharSet              C      EnvHp      ErrHp ErrHpBatch
C    0 WE8DEC                                                    1 112859e40 112865178 112864a28
C Starting user session (con_hdl=0,svchp=112862858,srvhp=1128674d8,usrhp=112861c60)
C Now 'SAPSR3/<pwd>@<SID>' is connected (con_hdl 0, nls_hdl 0).
C Database NLS settings: AMERICAN_AMERICA.WE8DEC
C DB instance <SID> is running on sap<SID> with ORACLE version 10.2.0.4.0 since JAN 28, 2010, 00:55:44
B Connection 0 opened (DBSL handle 0)
B Wp Hdl ConName          ConId     ConState     TX PRM RCT TIM MAX OPT Date     Time   DBHost
B 000 000 R/3              000000000 ACTIVE       NO YES NO 000 255 255 20100128 012909 sap<SID>
M db_connect o.k.
Basically how authentication between SAP and Oracle takes place. What are the a/c that comes with SAP inst and what relevant a/c for these communication comes by default with Oracle Db installation.

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Hi,
Firstly I would suggest you to upgrade your database from Oracle Release 11.2.0.1.0 to Oracle Release 11.2.0.2 . This is the recommended Oracle 11g database version for SAP solutions. Many of your problem will get resolved with it.
Question 1:
So my first question would be is there any other suggestions besides adjusting the mentioned parameter above in order to ensure that no work processors going into hang state due to RFCs' occupying it as this issue always happens at the end of the month only when there are massive users accessing it.
For immediate resolution the approach you have followed is correct viz limiting number of dialog processes for RFC. Secondly you need to analyze why RFC processing takes so much time. You need check which programs are getting executed by those RFC.
Generate EarlyWatch report for more detailed view
Question 2:
My second question is what went wrong with the libttsh11.so file. How could it be 0 size in PRD when no signs of changes had happen to the PRD system. Is this a proven Oracle Bug or something else since I have never encountered anything like this before.
The libttsh11.so library cannot be found in the related directory.
Cause
The file system is mounted using CIO option, but per Note 257338.1 Direct I/O (DIO) and Concurrent I/O (CIO) on AIX 5L, an ORACLE_HOME on a filesystem mounted with "cio" option is not supported.
Such a configuration will cause, installation, relinking and other unexpected problems.
Solution
Disable the CIO option on the filesystem.
References
NOTE:257338.1 - Direct I/O (DIO) and Concurrent I/O (CIO) on AIX 5L
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