OPatch failure issue while patching RAC (11.2.0.3)

While patching the RAC/DB you may face different issues on Windows because of the .dll files being used. Here is the process how I got rid of such failure.
While performing the acfsroot install, it failed as below.

Applying Patch 6 on RAC 11gR2 (11.2.0.3)

Environment: 11gRAC/DB (11.2.0.3) , Windows Server 2008 R2 x64 Edition
Patch:13965211 - 11.2.0.3 Patch 6 for Windows 64 bit, download patch from metalink.
This patch is RAC rolling upgradable for GRID, and RDBMS homes.
You should administer one Oracle product, one Oracle home at a time, for its particular Bundle Patch Update.

CRS-4535: Cannot communicate with Cluster Ready Services

We have SCOM configured for Oracle Servers to know if some service crashes, today I got the following alert for one of our RAC node.
The OracleASMService+ASM1 service terminated unexpectedly.  
I started investigations and tried to get the status by crsctl as below 

SP2-1503: Unable to initialize Oracle call interface

Oracle Error :: SP2-1503

SP2-1503: Unable to initialize Oracle call interface
SP2-0152: ORACLE may not be functioning properly

Cause

Indicates a library used by SQL*Plus to communicate with the database failed to initialize correctly.

ORA-01002: fetch out of sequence

"ORA-01002: fetch out of sequence" usually means that a SQL fetch has been issued after a prior commit has closed a server side cursor.

The current default behaviour of the Oracle JDBC driver is to autocommit SQL Statements. So it is possible that a commit has been issued which you did not expect. Eg if you are performing update statements inside the fetch loop, it is possible that an automatic commit has been issued after the update which has closed the fetch loop's cursor.

Enable block change tracking in oracle 11g

The block change tracking (BCT) feature for incremental backups improves incremental backup performance by recording changed blocks in each datafile in a block change tracking file. This file is a small binary file called block change tracking (BCT) file stored in the database area. RMAN tracks changed blocks as redo is generated.

RMAN backup fails with Ora-00245 And Rman-08132

Symptoms

RMAN backups report errors like :

ORA-00245: control file backup operation failed

RMAN-08132: WARNING: cannot update recovery area reclaimable file list

Cause

Incorrect specification for the Snapshot Controlfile

ORA-19815: WARNING: DB_RECOVERY_FILE_DEST_SIZE 100.00% USED

Symptoms

ALERT LOG
-----------
ORA-19815: WARNING: db_recovery_file_dest_size of 3221225472 bytes is 100.00% used, and has 0 remaining bytes available.
************************************************************************
ARC0: Error 19809 Creating archive log file to '+DBFLASH'

How To Create a Connection With SQL Server In SQL*DEVELOPER

Ensure that the source database is accessible by the Microsoft SQL Server user and the system from where you are connecting that is used by SQL Developer for the source connection.You can test by creating the ODBC datasource to the SQLServer DB.

Access Control List for External Network Services (11g)

Starting with Oracle 11gR1 (11.1.0.6) so called "fine-grained access" was implemented to limit usage of packages like UTL_SMTP, UTL_HTTP connecting over the network to other services like mail server etc.

Log Files in RAC Environment

The Cluster Ready Services Daemon (crsd) Log Files

Log files for the CRSD process (crsd) can be found in the following directories:

ORA_CRS_HOME/log/hostname/crsd

the crsd.log file is archived every 10MB as crsd.101, crsd.102 ...
ORACLE_CRS_HOME/log//alert.log